Date   

Re: SDR Console does not open Pluto

Simon Brown
 

Ah,

 

OK – well, this sounds like either USB or a bad DLL on your system.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 03 March 2021 07:15
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Simon,

As I said if I try to open the Pluto by Select radio or Start  SDR Console freezes

73

Jacques F6BKI

 

Le 03/03/2021 à 05:44, Simon Brown a écrit :

Hi,

 

Show me the logfile *after* you have tried to open Pluto please.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 22:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Simon,

attached logfile

Merci

73 jacques F6BKI

Le 02/03/2021 à 17:58, Simon Brown a écrit :

Logfile?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI

 

 

Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


--

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--

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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDR Console does not open Pluto

Jacques RAMBAUD
 

Simon,

As I said if I try to open the Pluto by Select radio or Start  SDR Console freezes

73

Jacques F6BKI


Le 03/03/2021 à 05:44, Simon Brown a écrit :

Hi,

 

Show me the logfile *after* you have tried to open Pluto please.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 22:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Simon,

attached logfile

Merci

73 jacques F6BKI

Le 02/03/2021 à 17:58, Simon Brown a écrit :

Logfile?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI

 

 

Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


--

- + - + -

Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDR Console does not open Pluto

Simon Brown
 

Hi,

 

Show me the logfile *after* you have tried to open Pluto please.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 22:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Simon,

attached logfile

Merci

73 jacques F6BKI

Le 02/03/2021 à 17:58, Simon Brown a écrit :

Logfile?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI

 

 

Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


--

- + - + -

Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: locking the receiver to a stable carrier

jdow
 

The theoretical possibility exists if and only if that carrier is within your current front end's passband. For example, you cannot lock an AirSpy Discovery to WWV while listening to 3.87 MHz AM. But, you could lock an AirSpy Discovery tuned to 10.103 MHz to 10 MHz WWV if WWV is coming through for you at the time. Such a feature has not been implemented. As I see it the potential for this is so limited and HF "standard frequencies" are so unstable it's not worth it. (WWV varies a surprising amount throughout a day once the ionosphere gets through with mangling it.)

{^_^}

On 20210302 11:17:01, Corneliu via groups.io wrote:
There is a special feature in SDR Console which locks the receiver to the digital beacon on the narrow-band transponder.
Is it possible to implement this feature in the HF spectrum, locking the receiver to a stable carrier?

73 de YO4AUL



Re: SDR Console does not open Pluto

Jacques RAMBAUD
 

Simon,

attached logfile

Merci

73 jacques F6BKI

Le 02/03/2021 à 17:58, Simon Brown a écrit :

Logfile?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI

 

 

Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDR Console does not open Pluto

Jacques RAMBAUD
 

Thank you will look at it

73 jacques F6BKI

Le 02/03/2021 à 22:15, jdow a écrit :
You do have the Pluto drivers installed, I presume. In case something is missing the drivers and some useful information can be obtained at Analog Devices Wiki.

{^_^}

On 20210302 08:46:44, Jacques RAMBAUD wrote:

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI



Le 02/03/2021 à 14:51, Roy VE7DH a écrit :
Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


Re: SDR Console does not open Pluto

jdow
 

You do have the Pluto drivers installed, I presume. In case something is missing the drivers and some useful information can be obtained at Analog Devices Wiki.

{^_^}

On 20210302 08:46:44, Jacques RAMBAUD wrote:

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI



Le 02/03/2021 à 14:51, Roy VE7DH a écrit :
Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


Re: Earths Doppler

jdow
 

And when the Doppler shift does not shift it is a good idea to get out of the way if the shift itself is upwards.
{^_-}

On 20210302 05:10:18, Andrea Dalbagno wrote:
To put it simple, we could make a parallelism, thinking about distance (x), speed (v=dx/dt or " the variation of the distance along the time) and acceleration (a=dv/dt=d2x/d2t or " the variation of the speed along the time" or again "the variation of the variation of the distance").
So far frequency "is" distance, Doppler shift "is" velocity and Doppler shift's shift "is" acceleration.
To all of above we can apply calculus rules of derivatives and put the results on graphs. ;-)

Cheers
Andrea

Il mar 2 mar 2021, 13:32 jdow <jdow@...> ha scritto:
It seems either he or the SETI community has elected to say "Doppler Shift" when they mean "Doppler Shift Shift", the difference between successive Doppler Shift measurements. That means either he or the SETI community cannot meaningfully talk about this feature with others. With infinite precision instruments the Doppler shift may be positive or negative. But the difference between successive readings goes down consistently enough to get away with "always down."

If the whole community speaks as he does then it should let people know that is what is meant. And they should be aware that this shift in meaning MAY obscure some important data. A Doppler Shift, in their terms, may or may not be dangerous with an object, such as radar returns from a 7 mile diameter rock, that is approaching or receding respectively.

{^_^}

On 20210302 04:19:53, Conrad, PA5Y wrote:
Thing is James, it is a shame that it descended to this, but he is right. For the lunar path, doppler goes down from a positive point at moon rise, then through zero then down further. But from moon rise to zenith the doppler shift is positive relative to the transmit frequency.  '

Your own Wikipedia source states 'compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession'

Anyway best leave it now.

73

Conrad PA5Y


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of James Brown via groups.io <JIM@...>
Sent: 02 March 2021 01:58
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Earths Doppler
 

This should be clear enough

Piss off

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Monday, March 1, 2021 14:49
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

mv James\ Brown /dev/null
He does not speak English with any rigor at all.

{^_^}

On 20210301 09:37:04, James Brown wrote:

Wikipedia has a pretty good description of the siren/ambulance effect
find ‘Sirens’

 

https://en.wikipedia.org/wiki/Doppler_effect

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of n2msqrp
Sent: Monday, March 1, 2021 08:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

We can test this by monitoring a low earth orbiting satellite.

 

Mike N2MS

On 03/01/2021 10:41 AM James Brown <jim@...> wrote:

 

 

Its quiet. Not a sound can be heard.
Suddenly an ambulance crests a hill a mile away and you hear its siren.
It comes at you with a steady pace. As it gets closer does the pitch go up?
It passes you. Does the pitch go down?

Did it ever go up?

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Monday, March 1, 2021 06:15
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Ambulance towards you shifts up

Ambulance away from you shifts down

... In circles... Stays the same as long as the ambulance is not a supersonic jet

Dg9bfc sigi 

 

Am 01.03.2021 06:28 schrieb jdow <jdow@...>:

Depends on whether you are babbling or communicating, doesn't it?

{^_-}

On 20210228 21:00:53, James Brown wrote:

Humm.
… and yet it moves

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 14:48
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

No I do not. I would agree if you preceded it with "The change in". You are conflating a quantity and its (calculus) derivative.

Doppler shift is not the change in Doppler shift, which you are talking about.

{^_^}

On 20210228 14:29:09, James Brown wrote:

So you agree that the Doppler shift from the Earth’s rotation is always down – right?
or are we still talking past each other.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 13:57
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Terminology problems are bumping around here.

The absolute Doppler shift is higher if the emitter is approaching you and lower if it is receding from you. As long as constant motion is involved the change in Doppler shift will tend downwards from above normal to below normal as the emitter's relative vector to the observer changes. So I still take exception to your aphorism. "The change in Doppler shift is always down in frequency" is more accurate than "Doppler shift is always down in frequency".

{^_^}


On 20210228 06:46:10, James Brown wrote:

Check this out and tell me what you think
https://tinyurl.com/ry6n6w67
Regards…….. Jim

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, February 27, 2021 21:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Earth's rotational Doppler is as often up as down. Earth's orbital Doppler should also be up or down. They should be easily separable on long term observation. The former changes faster than the latter.

How do you get "Doppler shift is always down in frequency?"

{^_^}


On 20210227 21:26:27, James Brown wrote:

It took me a long time and some advice from experts but I finally got it running.

I know the pointing angle of my antenna, it tracks whatever target it is set to, so with a bit of Trig I calculate the fall in frequency because of the Earth’s rotation at that angle, second by second. When the sum of the change reaches 1 Hz I move the receiver frequency down by 1 Hz.

Each 20 kHz chunk of spectrum gets scanned usually 10,000 times and a buffer is built from these scans. At the end of 10,000 scans I average each of the FFT bins and then look for average bins that pop up from their neighboring bins 5 on each side.  No hits – I move up band to the next 20,000 kHz chunk. If hit – I stay on this frequency and repeat five more time. All data is saved to my server and can be viewed here:
https://tinyurl.com/2jawwc83

A complete scan of the 100 MHz wide Waterhole at this rate will take somewhere on the order of 6 million hours.

p.s. Did you know that Doppler shift is always down in frequency?





 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Saturday, February 27, 2021 20:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

doppler effect is mturn of the earth ... move of the earth, position of moon and sun ... etc etc

difficult to calculate all that

we have the qo100 sat ... and it drifts around 40hz up down every day (like the tide in the ocean does)

and ... from earth ist stationary (more or less) ... only moon and sun in that system moves

now add turning earth ... and move of earth in space ... and different view angle of antenna (az and el) ... how do you calculate that??

dg9bfc sigi

Am 27.02.2021 um 21:37 schrieb James Brown:

Thanks for the question Roy.

The technique I use to discriminate terrestrial signals from  Extraterrestrial ones makes use of the fact that signals coming in from outside the Earth will be shifted down in frequency do to the Doppler effect from the rotation of the Earth. Carl Sagan outlined this technique in a book “Communication with Extraterrestrial Intelligence” back in 1971.

So if you look at a waterfall of the same 20 kHz chuck of the spectrum over a long period of time, say half and hour, all the local signals will be straight up and down lines. The extraterrestrial ones will curve down in frequency over that time. So the trick is to sort the two types.

What I do is chirp the receiver down in step with the calculated Earth rotational Doppler, which is dependent on the antenna pointing angle. Right now I see that my receiver is chirping down at 0.112 Hz/Sec. That way all the local signals in the waterfall appear to curve up and the Extraterrestrial ones stay in a straight line. This make the software *much* easier. Then I search through the buffer for vertical lines rather than curved ones. It does depend on a stable receiver for sure.

That’s the first order detection filter that I use.

 

Regards….. Jim

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Roy VE7DH
Sent: Saturday, February 27, 2021 12:32
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Hi James,

I took a look at your very interesting web site. One thing I don't understand is why you need to tune the receiver at all.

Could you not look at the entire 20 khz spectrum in one chunk, as you say, and then examine each 1 hz portion entirely in software?

This way, there is no tuning requirement, just a stability requirement.

Of, course I may have no idea what I'm talking about...

regards, Roy

 

 

 

 

 

 

 




Re: Winradio G39DDC

FoxAcid01
 

Hello,

John Collins, Portland, Oregon here-I would very much like to test the G39DDC functionality.  Please advise.

thank you for your efforts and results!

John Collins

_________________________________________

On 3/2/2021 3:54 AM, Simon Brown wrote:

If anyone wants to test with a G39DDC please send me an email.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown
Sent: 02 March 2021 07:20
To: 'SDR-Radio' <SDR-Radio@groups.io>
Subject: [SDR-Radio] Winradio G39DDC

 

So,

 

Dig out your G39DDCs, we’ll be testing later today. Listening to 80m DX as I type…

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 


-



locking the receiver to a stable carrier

Corneliu
 

There is a special feature in SDR Console which locks the receiver to the digital beacon on the narrow-band transponder.
Is it possible to implement this feature in the HF spectrum, locking the receiver to a stable carrier?

73 de YO4AUL


Re: SDR Console does not open Pluto

Simon Brown
 

Logfile?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 02 March 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR Console does not open Pluto

 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI

 

 

Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDR Console does not open Pluto

Jacques RAMBAUD
 

Simon,

Still not able to Select a Radio nor Start my Pluto from SDR Console, on each case SDR Console freezes  but I can open SATSAGEN software ( spectrum analyser/RF generator) which uses my PUTO on the same USB port .

73 Jacques F6BKI



Le 01/03/2021 à 18:11, Simon Brown a écrit :

Try a different USB port.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jacques RAMBAUD
Sent: 01 March 2021 16:05
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDR Console does not open Pluto

 

Hello,

Was runing a Pluto with SDR Console without any problem and one day SDR Console start to freeze doing Select Radio , if used on an other PC the same Pluto is recognized doing Select Radio and working fine with SDR Console .

On the PC where it is not working I have re installed the Pluto Windows drivers , re installed SDR Console , no success . I can see the Pluto under C:  .

PC is an I5 runing W10.

any ideas ?

Tks

jacques F6BKI


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDR Console does not open Pluto

Jacques RAMBAUD
 

Hi Bob,

Thank you, tried using the two USB ports no success.

73

Jacques F6BKI



Le 02/03/2021 à 14:51, Roy VE7DH a écrit :

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


Re: SDR Console does not open Pluto

Roy VE7DH
 

Are you using both usb ports on the Pluto? You need to plug in both ports because, quick frankly, the usb connectors on the Pluto are cheap garbage and the main data connector seems to fail at delivering 5 volts to the Pluto, so you need the second usb port connected to make the whole thing work.

At least that is my experience with more than one Pluto.

regards, Roy


Re: Earths Doppler

David L. Wilson
 

Just a comment that people often refer to "doppler" as to how they know a signal is a non-geostationary satellite, i.e., its change in frequency as it passes.  And of course they are indeed referring to the derivative of the frequency but that is what they (essentially most of them) are calling "doppler".  So in reality, "doppler" is used two ways:  (1)  the difference from the transmitted frequency and receive frequency due to relative motion between the transmitter and receiver, and (2)  the changing (derivative) in frequency as a non-geostationary satellite passes over.  In reality, in some (likely most) signal *listening* circles, (2) is the most common use (using more words like "derivative of the frequency" or "changing of frequency" would be too verbose); those people would refer to the difference from the transmitted frequency as the "doppler shift" (and in the Wiki page refered to, they are addressing "doppler shift").  The main point here is that in usagethe word  "doppler" alone is a general (somewhat sloppy) term that can mean different things.  That (unlike doppler shift) is not going to change. :-)


Analyzing battery Charger Noise using a LISN Line Impedance Stabilization Network

Paul Cianciolo
 

Anyone who is interested of SWL'ing  NDB hunting, DX'ing, or any sort of listen in the LF MF and HF band has run into these cheap battery chargers and the RFI noise  havoc they wreak.
This video shows a ways to compare noise sources focusing on bad battery chargers. Next episode we will cover LED lighting and compare those.
SDR's are the perfect tool for visualizing noise signatures.
Not strictly on topic but surely of interest to any radio enthusiast.

https://youtu.be/JwcMwH1Xw2c


PaulC

W1VLF


Re: Earths Doppler

Andrea Dalbagno
 

To put it simple, we could make a parallelism, thinking about distance (x), speed (v=dx/dt or " the variation of the distance along the time) and acceleration (a=dv/dt=d2x/d2t or " the variation of the speed along the time" or again "the variation of the variation of the distance").
So far frequency "is" distance, Doppler shift "is" velocity and Doppler shift's shift "is" acceleration.
To all of above we can apply calculus rules of derivatives and put the results on graphs. ;-)

Cheers
Andrea

Il mar 2 mar 2021, 13:32 jdow <jdow@...> ha scritto:
It seems either he or the SETI community has elected to say "Doppler Shift" when they mean "Doppler Shift Shift", the difference between successive Doppler Shift measurements. That means either he or the SETI community cannot meaningfully talk about this feature with others. With infinite precision instruments the Doppler shift may be positive or negative. But the difference between successive readings goes down consistently enough to get away with "always down."

If the whole community speaks as he does then it should let people know that is what is meant. And they should be aware that this shift in meaning MAY obscure some important data. A Doppler Shift, in their terms, may or may not be dangerous with an object, such as radar returns from a 7 mile diameter rock, that is approaching or receding respectively.

{^_^}

On 20210302 04:19:53, Conrad, PA5Y wrote:
Thing is James, it is a shame that it descended to this, but he is right. For the lunar path, doppler goes down from a positive point at moon rise, then through zero then down further. But from moon rise to zenith the doppler shift is positive relative to the transmit frequency.  '

Your own Wikipedia source states 'compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession'

Anyway best leave it now.

73

Conrad PA5Y


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of James Brown via groups.io <JIM@...>
Sent: 02 March 2021 01:58
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Earths Doppler
 

This should be clear enough

Piss off

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Monday, March 1, 2021 14:49
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

mv James\ Brown /dev/null
He does not speak English with any rigor at all.

{^_^}

On 20210301 09:37:04, James Brown wrote:

Wikipedia has a pretty good description of the siren/ambulance effect
find ‘Sirens’

 

https://en.wikipedia.org/wiki/Doppler_effect

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of n2msqrp
Sent: Monday, March 1, 2021 08:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

We can test this by monitoring a low earth orbiting satellite.

 

Mike N2MS

On 03/01/2021 10:41 AM James Brown <jim@...> wrote:

 

 

Its quiet. Not a sound can be heard.
Suddenly an ambulance crests a hill a mile away and you hear its siren.
It comes at you with a steady pace. As it gets closer does the pitch go up?
It passes you. Does the pitch go down?

Did it ever go up?

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Monday, March 1, 2021 06:15
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Ambulance towards you shifts up

Ambulance away from you shifts down

... In circles... Stays the same as long as the ambulance is not a supersonic jet

Dg9bfc sigi 

 

Am 01.03.2021 06:28 schrieb jdow <jdow@...>:

Depends on whether you are babbling or communicating, doesn't it?

{^_-}

On 20210228 21:00:53, James Brown wrote:

Humm.
… and yet it moves

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 14:48
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

No I do not. I would agree if you preceded it with "The change in". You are conflating a quantity and its (calculus) derivative.

Doppler shift is not the change in Doppler shift, which you are talking about.

{^_^}

On 20210228 14:29:09, James Brown wrote:

So you agree that the Doppler shift from the Earth’s rotation is always down – right?
or are we still talking past each other.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 13:57
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Terminology problems are bumping around here.

The absolute Doppler shift is higher if the emitter is approaching you and lower if it is receding from you. As long as constant motion is involved the change in Doppler shift will tend downwards from above normal to below normal as the emitter's relative vector to the observer changes. So I still take exception to your aphorism. "The change in Doppler shift is always down in frequency" is more accurate than "Doppler shift is always down in frequency".

{^_^}


On 20210228 06:46:10, James Brown wrote:

Check this out and tell me what you think
https://tinyurl.com/ry6n6w67
Regards…….. Jim

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, February 27, 2021 21:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Earth's rotational Doppler is as often up as down. Earth's orbital Doppler should also be up or down. They should be easily separable on long term observation. The former changes faster than the latter.

How do you get "Doppler shift is always down in frequency?"

{^_^}


On 20210227 21:26:27, James Brown wrote:

It took me a long time and some advice from experts but I finally got it running.

I know the pointing angle of my antenna, it tracks whatever target it is set to, so with a bit of Trig I calculate the fall in frequency because of the Earth’s rotation at that angle, second by second. When the sum of the change reaches 1 Hz I move the receiver frequency down by 1 Hz.

Each 20 kHz chunk of spectrum gets scanned usually 10,000 times and a buffer is built from these scans. At the end of 10,000 scans I average each of the FFT bins and then look for average bins that pop up from their neighboring bins 5 on each side.  No hits – I move up band to the next 20,000 kHz chunk. If hit – I stay on this frequency and repeat five more time. All data is saved to my server and can be viewed here:
https://tinyurl.com/2jawwc83

A complete scan of the 100 MHz wide Waterhole at this rate will take somewhere on the order of 6 million hours.

p.s. Did you know that Doppler shift is always down in frequency?





 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Saturday, February 27, 2021 20:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

doppler effect is mturn of the earth ... move of the earth, position of moon and sun ... etc etc

difficult to calculate all that

we have the qo100 sat ... and it drifts around 40hz up down every day (like the tide in the ocean does)

and ... from earth ist stationary (more or less) ... only moon and sun in that system moves

now add turning earth ... and move of earth in space ... and different view angle of antenna (az and el) ... how do you calculate that??

dg9bfc sigi

Am 27.02.2021 um 21:37 schrieb James Brown:

Thanks for the question Roy.

The technique I use to discriminate terrestrial signals from  Extraterrestrial ones makes use of the fact that signals coming in from outside the Earth will be shifted down in frequency do to the Doppler effect from the rotation of the Earth. Carl Sagan outlined this technique in a book “Communication with Extraterrestrial Intelligence” back in 1971.

So if you look at a waterfall of the same 20 kHz chuck of the spectrum over a long period of time, say half and hour, all the local signals will be straight up and down lines. The extraterrestrial ones will curve down in frequency over that time. So the trick is to sort the two types.

What I do is chirp the receiver down in step with the calculated Earth rotational Doppler, which is dependent on the antenna pointing angle. Right now I see that my receiver is chirping down at 0.112 Hz/Sec. That way all the local signals in the waterfall appear to curve up and the Extraterrestrial ones stay in a straight line. This make the software *much* easier. Then I search through the buffer for vertical lines rather than curved ones. It does depend on a stable receiver for sure.

That’s the first order detection filter that I use.

 

Regards….. Jim

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Roy VE7DH
Sent: Saturday, February 27, 2021 12:32
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Hi James,

I took a look at your very interesting web site. One thing I don't understand is why you need to tune the receiver at all.

Could you not look at the entire 20 khz spectrum in one chunk, as you say, and then examine each 1 hz portion entirely in software?

This way, there is no tuning requirement, just a stability requirement.

Of, course I may have no idea what I'm talking about...

regards, Roy

 

 

 

 

 

 

 



Re: Earths Doppler

jdow
 

It seems either he or the SETI community has elected to say "Doppler Shift" when they mean "Doppler Shift Shift", the difference between successive Doppler Shift measurements. That means either he or the SETI community cannot meaningfully talk about this feature with others. With infinite precision instruments the Doppler shift may be positive or negative. But the difference between successive readings goes down consistently enough to get away with "always down."

If the whole community speaks as he does then it should let people know that is what is meant. And they should be aware that this shift in meaning MAY obscure some important data. A Doppler Shift, in their terms, may or may not be dangerous with an object, such as radar returns from a 7 mile diameter rock, that is approaching or receding respectively.

{^_^}

On 20210302 04:19:53, Conrad, PA5Y wrote:
Thing is James, it is a shame that it descended to this, but he is right. For the lunar path, doppler goes down from a positive point at moon rise, then through zero then down further. But from moon rise to zenith the doppler shift is positive relative to the transmit frequency.  '

Your own Wikipedia source states 'compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession'

Anyway best leave it now.

73

Conrad PA5Y


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of James Brown via groups.io <JIM@...>
Sent: 02 March 2021 01:58
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Earths Doppler
 

This should be clear enough

Piss off

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Monday, March 1, 2021 14:49
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

mv James\ Brown /dev/null
He does not speak English with any rigor at all.

{^_^}

On 20210301 09:37:04, James Brown wrote:

Wikipedia has a pretty good description of the siren/ambulance effect
find ‘Sirens’

 

https://en.wikipedia.org/wiki/Doppler_effect

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of n2msqrp
Sent: Monday, March 1, 2021 08:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

We can test this by monitoring a low earth orbiting satellite.

 

Mike N2MS

On 03/01/2021 10:41 AM James Brown <jim@...> wrote:

 

 

Its quiet. Not a sound can be heard.
Suddenly an ambulance crests a hill a mile away and you hear its siren.
It comes at you with a steady pace. As it gets closer does the pitch go up?
It passes you. Does the pitch go down?

Did it ever go up?

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Monday, March 1, 2021 06:15
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Ambulance towards you shifts up

Ambulance away from you shifts down

... In circles... Stays the same as long as the ambulance is not a supersonic jet

Dg9bfc sigi 

 

Am 01.03.2021 06:28 schrieb jdow <jdow@...>:

Depends on whether you are babbling or communicating, doesn't it?

{^_-}

On 20210228 21:00:53, James Brown wrote:

Humm.
… and yet it moves

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 14:48
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

No I do not. I would agree if you preceded it with "The change in". You are conflating a quantity and its (calculus) derivative.

Doppler shift is not the change in Doppler shift, which you are talking about.

{^_^}

On 20210228 14:29:09, James Brown wrote:

So you agree that the Doppler shift from the Earth’s rotation is always down – right?
or are we still talking past each other.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 13:57
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Terminology problems are bumping around here.

The absolute Doppler shift is higher if the emitter is approaching you and lower if it is receding from you. As long as constant motion is involved the change in Doppler shift will tend downwards from above normal to below normal as the emitter's relative vector to the observer changes. So I still take exception to your aphorism. "The change in Doppler shift is always down in frequency" is more accurate than "Doppler shift is always down in frequency".

{^_^}


On 20210228 06:46:10, James Brown wrote:

Check this out and tell me what you think
https://tinyurl.com/ry6n6w67
Regards…….. Jim

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, February 27, 2021 21:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Earth's rotational Doppler is as often up as down. Earth's orbital Doppler should also be up or down. They should be easily separable on long term observation. The former changes faster than the latter.

How do you get "Doppler shift is always down in frequency?"

{^_^}


On 20210227 21:26:27, James Brown wrote:

It took me a long time and some advice from experts but I finally got it running.

I know the pointing angle of my antenna, it tracks whatever target it is set to, so with a bit of Trig I calculate the fall in frequency because of the Earth’s rotation at that angle, second by second. When the sum of the change reaches 1 Hz I move the receiver frequency down by 1 Hz.

Each 20 kHz chunk of spectrum gets scanned usually 10,000 times and a buffer is built from these scans. At the end of 10,000 scans I average each of the FFT bins and then look for average bins that pop up from their neighboring bins 5 on each side.  No hits – I move up band to the next 20,000 kHz chunk. If hit – I stay on this frequency and repeat five more time. All data is saved to my server and can be viewed here:
https://tinyurl.com/2jawwc83

A complete scan of the 100 MHz wide Waterhole at this rate will take somewhere on the order of 6 million hours.

p.s. Did you know that Doppler shift is always down in frequency?





 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Saturday, February 27, 2021 20:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

doppler effect is mturn of the earth ... move of the earth, position of moon and sun ... etc etc

difficult to calculate all that

we have the qo100 sat ... and it drifts around 40hz up down every day (like the tide in the ocean does)

and ... from earth ist stationary (more or less) ... only moon and sun in that system moves

now add turning earth ... and move of earth in space ... and different view angle of antenna (az and el) ... how do you calculate that??

dg9bfc sigi

Am 27.02.2021 um 21:37 schrieb James Brown:

Thanks for the question Roy.

The technique I use to discriminate terrestrial signals from  Extraterrestrial ones makes use of the fact that signals coming in from outside the Earth will be shifted down in frequency do to the Doppler effect from the rotation of the Earth. Carl Sagan outlined this technique in a book “Communication with Extraterrestrial Intelligence” back in 1971.

So if you look at a waterfall of the same 20 kHz chuck of the spectrum over a long period of time, say half and hour, all the local signals will be straight up and down lines. The extraterrestrial ones will curve down in frequency over that time. So the trick is to sort the two types.

What I do is chirp the receiver down in step with the calculated Earth rotational Doppler, which is dependent on the antenna pointing angle. Right now I see that my receiver is chirping down at 0.112 Hz/Sec. That way all the local signals in the waterfall appear to curve up and the Extraterrestrial ones stay in a straight line. This make the software *much* easier. Then I search through the buffer for vertical lines rather than curved ones. It does depend on a stable receiver for sure.

That’s the first order detection filter that I use.

 

Regards….. Jim

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Roy VE7DH
Sent: Saturday, February 27, 2021 12:32
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Hi James,

I took a look at your very interesting web site. One thing I don't understand is why you need to tune the receiver at all.

Could you not look at the entire 20 khz spectrum in one chunk, as you say, and then examine each 1 hz portion entirely in software?

This way, there is no tuning requirement, just a stability requirement.

Of, course I may have no idea what I'm talking about...

regards, Roy

 

 

 

 

 

 

 



Re: Earths Doppler

Conrad, PA5Y
 

Thing is James, it is a shame that it descended to this, but he is right. For the lunar path, doppler goes down from a positive point at moon rise, then through zero then down further. But from moon rise to zenith the doppler shift is positive relative to the transmit frequency.  '

Your own Wikipedia source states 'compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession'

Anyway best leave it now.

73

Conrad PA5Y


From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of James Brown via groups.io <JIM@...>
Sent: 02 March 2021 01:58
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Earths Doppler
 

This should be clear enough

Piss off

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Monday, March 1, 2021 14:49
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

mv James\ Brown /dev/null
He does not speak English with any rigor at all.

{^_^}

On 20210301 09:37:04, James Brown wrote:

Wikipedia has a pretty good description of the siren/ambulance effect
find ‘Sirens’

 

https://en.wikipedia.org/wiki/Doppler_effect

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of n2msqrp
Sent: Monday, March 1, 2021 08:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

We can test this by monitoring a low earth orbiting satellite.

 

Mike N2MS

On 03/01/2021 10:41 AM James Brown <jim@...> wrote:

 

 

Its quiet. Not a sound can be heard.
Suddenly an ambulance crests a hill a mile away and you hear its siren.
It comes at you with a steady pace. As it gets closer does the pitch go up?
It passes you. Does the pitch go down?

Did it ever go up?

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Monday, March 1, 2021 06:15
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Ambulance towards you shifts up

Ambulance away from you shifts down

... In circles... Stays the same as long as the ambulance is not a supersonic jet

Dg9bfc sigi 

 

Am 01.03.2021 06:28 schrieb jdow <jdow@...>:

Depends on whether you are babbling or communicating, doesn't it?

{^_-}

On 20210228 21:00:53, James Brown wrote:

Humm.
… and yet it moves

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 14:48
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

No I do not. I would agree if you preceded it with "The change in". You are conflating a quantity and its (calculus) derivative.

Doppler shift is not the change in Doppler shift, which you are talking about.

{^_^}

On 20210228 14:29:09, James Brown wrote:

So you agree that the Doppler shift from the Earth’s rotation is always down – right?
or are we still talking past each other.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, February 28, 2021 13:57
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Earths Doppler

 

Terminology problems are bumping around here.

The absolute Doppler shift is higher if the emitter is approaching you and lower if it is receding from you. As long as constant motion is involved the change in Doppler shift will tend downwards from above normal to below normal as the emitter's relative vector to the observer changes. So I still take exception to your aphorism. "The change in Doppler shift is always down in frequency" is more accurate than "Doppler shift is always down in frequency".

{^_^}


On 20210228 06:46:10, James Brown wrote:

Check this out and tell me what you think
https://tinyurl.com/ry6n6w67
Regards…….. Jim

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, February 27, 2021 21:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Earth's rotational Doppler is as often up as down. Earth's orbital Doppler should also be up or down. They should be easily separable on long term observation. The former changes faster than the latter.

How do you get "Doppler shift is always down in frequency?"

{^_^}


On 20210227 21:26:27, James Brown wrote:

It took me a long time and some advice from experts but I finally got it running.

I know the pointing angle of my antenna, it tracks whatever target it is set to, so with a bit of Trig I calculate the fall in frequency because of the Earth’s rotation at that angle, second by second. When the sum of the change reaches 1 Hz I move the receiver frequency down by 1 Hz.

Each 20 kHz chunk of spectrum gets scanned usually 10,000 times and a buffer is built from these scans. At the end of 10,000 scans I average each of the FFT bins and then look for average bins that pop up from their neighboring bins 5 on each side.  No hits – I move up band to the next 20,000 kHz chunk. If hit – I stay on this frequency and repeat five more time. All data is saved to my server and can be viewed here:
https://tinyurl.com/2jawwc83

A complete scan of the 100 MHz wide Waterhole at this rate will take somewhere on the order of 6 million hours.

p.s. Did you know that Doppler shift is always down in frequency?





 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien
Sent: Saturday, February 27, 2021 20:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

doppler effect is mturn of the earth ... move of the earth, position of moon and sun ... etc etc

difficult to calculate all that

we have the qo100 sat ... and it drifts around 40hz up down every day (like the tide in the ocean does)

and ... from earth ist stationary (more or less) ... only moon and sun in that system moves

now add turning earth ... and move of earth in space ... and different view angle of antenna (az and el) ... how do you calculate that??

dg9bfc sigi

Am 27.02.2021 um 21:37 schrieb James Brown:

Thanks for the question Roy.

The technique I use to discriminate terrestrial signals from  Extraterrestrial ones makes use of the fact that signals coming in from outside the Earth will be shifted down in frequency do to the Doppler effect from the rotation of the Earth. Carl Sagan outlined this technique in a book “Communication with Extraterrestrial Intelligence” back in 1971.

So if you look at a waterfall of the same 20 kHz chuck of the spectrum over a long period of time, say half and hour, all the local signals will be straight up and down lines. The extraterrestrial ones will curve down in frequency over that time. So the trick is to sort the two types.

What I do is chirp the receiver down in step with the calculated Earth rotational Doppler, which is dependent on the antenna pointing angle. Right now I see that my receiver is chirping down at 0.112 Hz/Sec. That way all the local signals in the waterfall appear to curve up and the Extraterrestrial ones stay in a straight line. This make the software *much* easier. Then I search through the buffer for vertical lines rather than curved ones. It does depend on a stable receiver for sure.

That’s the first order detection filter that I use.

 

Regards….. Jim

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Roy VE7DH
Sent: Saturday, February 27, 2021 12:32
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Pluto Pluto+ minimum tuning

 

Hi James,

I took a look at your very interesting web site. One thing I don't understand is why you need to tune the receiver at all.

Could you not look at the entire 20 khz spectrum in one chunk, as you say, and then examine each 1 hz portion entirely in software?

This way, there is no tuning requirement, just a stability requirement.

Of, course I may have no idea what I'm talking about...

regards, Roy

 

 

 

 

 

 

 


Re: Winradio G39DDC

Simon Brown
 

If anyone wants to test with a G39DDC please send me an email.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown
Sent: 02 March 2021 07:20
To: 'SDR-Radio' <SDR-Radio@groups.io>
Subject: [SDR-Radio] Winradio G39DDC

 

So,

 

Dig out your G39DDCs, we’ll be testing later today. Listening to 80m DX as I type…

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 


--

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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


--
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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.

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