Date   

Re: 10 kHz-150 kHz Band Sweep from EN70 Indiana

D R
 

Hi Gedas,

Can you post a recording direct from SDRC, please?  It would be nice to be able to dive into the waterfall and look at some of the weak signals close up, although it was easy enough to pick out all the US Navy stations (and some French Navy as well).  A five minute duration is ample, and it keeps the filesize down to about 200MB.

I've added another recording I've just made - the solar panels are gone, the storms aren't too bad, and the LORAN transmitter is back on, but well below its normal power output, so it's all reasonably clear.  DDH47 on 147.3kHz is worth a look, as you can decode it with FLDigi (settings:  RTTY - Custom - 85Shift, 50baud, 5-0-1.5, Auto, 72char.  Use CW or LSB, filter centred on signal.)  I haven't checked it myself to see whether it was actually sending anything worth decoding, but I could always do a much longer recording if you want to try it out (German weather forecasts can make rivetting reading ;) ).

Regards,
Dave


Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

But S-Meter is not SNR meter. Although the SNR meter should be approximated from the S-Meter reading.

{^_-}

On 20210705 13:57:05, Conrad, PA5Y wrote:

Well I disagree, SNR improves as you reduce bandwidth, this is just physics. If the metering does not reflect this then the SNR metering is simply wrong. Just use your ears.

 

Conrad

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of oldjackbob via groups.io
Sent: 05 July 2021 16:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

 

Per the info on Simon's page explaining the operation of the S-meter, "[The signal level] is the peak spectrum FFT bin (output value) which is within the current filter."

That page is found here: https://www.sdr-radio.com/s-meter

Simon explains it clearly. There is no correlation of peak FFT bin value to filter bandwidth (or AGC level, or any other consideration), nor should there be. Any modern SDR-based S-meter that changes its reading based on filter bandwidth is doing it wrong.

I've said it before: Simon got it right, many others are getting it wrong.

Mark

 



Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

On 20210705 12:09:22, Bob Dengler wrote:
At 7/5/2021 10:43 AM, you wrote:
On Mon, Jul 5, 2021 at 09:26 AM, Bob Dengler wrote:
I strongly disagree. How else is one supposed to make total channel power measurements for radiometry? SDRs aren't just for communications, & any developer that codes their SDR apps otherwise is hamstringing their full potential. Right now the only apps I know of that can do this are HDSDR & SDRuno. HDSDR is compatible with all my SDRs so that covers my needs, but it would be nice if SDRC could display & record average channel power readings as well as HDSDR is fairly useless for NBFM monitoring (no de-emphasis).

I'll have to go through the forum archives to see if this has been requested, & do so if not.

Bob NO6B

Please define "average power". I've also seen the term "integrated power" bandied about in the Flex forums. There is no established definition for either term.
We can choose to split hairs on average vs. sample vs. RMS.  I think for purposes of amateur radiometry, any of the above will do.  If I'm wrong someone please chime in.

The function of an S-meter is not to report the "total power" or "average power" or "integrated power" in the passband, it is to report the highest voltage measured anywhere in the passband, irrespective of any nebulous "total power" contained within the filter. That's what Simon's S-meter does.
OK, fair enough.

An S-meter, as described above, is useless to me.  I would like to see the option of switching the S-meter function in SDRC to an average channel power meter.  

:)

Thanks

Bob NO6B 

Please, Bob, distinguish what you mean with reference to time domain or spectral domain. It all makes SO MUCH more sense in time domain. Then terms like "quasi peak" make sense. It's meter rise time written usefully. That term makes no sense in the frequency domain.

Please PLEASE *P*L*E*A*S*E* guys distinguish between frequency domain behavior and time domain behavior. Frequency domain behavior gets in there when Simon discusses picking one small frequency bin to represent the whole bandwidth of interest.

{o.o}


Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

WTFF is "Continuum mode". You are losing your audience by inventing terms that make no sense. Do you mean time domain where everything flows along in a sampled stream? If so then time domain makes more sense to the engineers designing things. It's instantly understandable.

{+_+}

On 20210705 12:27:26, sm6fhz wrote:
Hi.
I made a request for this (Continuum mode) in 2014 together with a basic specification of possible functions.
It can be found here:
https://sdr-radio.groups.io/g/main/message/23048
I hope it can make a baseline fore further development of a in dept specification.
73 / Ingolf, SM6FHZ


Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

I'm sorry guys - my autisim has kicked in and I have to get this off my chest before I explode.

As originally conceived the S-Meter was an indication of channel power. Meter ballistics and capacitor charge and discharge created a quaisi-peak reading over time. It takes a little time for the meter reading to rise and it generally if not originally takes longer to fall.

This served multiple purposes. I'm not sure which came first, protecting the operator's ears or providing a relative power indication for the operator. I suspect the latter was easier to implement before the days of AGC systems. Certainly IF alignment is facilitated by reading audio output power with any AGC disabled. Probably somebody figured that would be handy for operators to give some relative power readings during active communications. In some radios special meter calibration was used to give quasi accurate readings 6dB/S-unit. That did not sell so we got the 2 dB per S-Unit of the ProII coming out of the mess. (I have one so I pick on it's shortcomings.)

The important point above is that the S-Meter responds to instantaneous power changes slowly. This gives it the IARU's quasi-peak sort of performance much like a VU meter provides, as perhaps distinct from a Durrough meter. The value you see on the meter bears a fairly good indication, if the meter is accurate, of you real ability to communicate.

Once we move to the spectral domain from the time domain this "quasi-peak" loses meaning. It has to be applied between successive spectral computations. Since there are FFT peculiarities such as windowing involved it is difficult enough to be called impossible or at least quite impractical to make real accurate readings for say a 2.4 kHz bandwidth out of a spectrum with 10 Hz bins.

Fortunately in most cases one filters incoming data before switching to baseband processing. In the case of SSB it's a zero IF receiver so filtering after conversion can be used but power can be derived in much the same way. Take the IF filter output IQ values, square each one, and add them together. That is a real power value in dB relative to a dooby value. With a calibrated source the dooby value can become a real dBm value. (For AM demodulation the square root of that power value becomes your AM output without the distortion products the usual diode demodulators provide.)

Once you have that power value derived from I^2 + Q^2 you can filter it per the IARU quasi peak requirements and get correct S-Meter readings and behavior.

Do note that the I^2 + Q^2 reading above is NOT necessarily well related to selecting the highest level bin in an FFT output. With broadcast FM it very emphatically does not. I have seen peak spectral element values on a broadcast FM signal vary by more than 20 dB from silence to high modulation level. That is not in any way shape or manner proper S-Meter behavior.

Now maybe I can get this out of my head. I hope I did not get abusive above. (This is why I enjoy math. There is only one correct answer or set of answers. It's the way my brain works. And it's made my life "complicated" to say the least.)

{O.O}

On 20210705 12:02:37, Bob Dengler wrote:
At 7/5/2021 09:37 AM, you wrote:
Bob,

Is this Continuum mode? I would need an exact specification were I to add
this.
Not sure if I understand the question.  I'm referring to the channel power or S-meter, which if I understand correctly current indicates peak channel power.  It would be nice to have the option to have it read average channel power, then also have the ability to store those readings to a CSV file (2 columns: time & dBm) every x milliseconds.  This is exactly what HDSDR offers.  Once calibrated with a known noise source or hot/cold load, this allows using an SDR as a radiometer.  Also give us one or two significant digits after the dBm decimal point.

I'll put the above in the SDRC Requests forum if needed.  Thanks!

Bob NO6B 


Re: SNR meter, bandwidth and gain adjustment for transverters

Mark Cayton
 

Joanne,

I didn't "go off the cliff" anywhere.

1) "So if you have a signal that features multiple peaks all about the same amplitude how big is the S-Meter error?" What "error" are you referring to?? There is no "error". In the case you describe (with multiple equal peaks), the S-meter should read the same regardless of whether there are one or a thousand peaks. As I've stated unwaveringly, the S-meter should report the highest value detected anywhere in the passband, no more and no less. What part of that rule is not clear to you? It's clear to me by your very question that you don't have the slightest grasp on that simple rule.

2) "Take an NFM signal modulated by a sine wave. Run up the modulation from zero until there are three spikes showing within the NFM bandwidth that are all the same level. What is the correct measurement? One of the peaks or the proper sum of all three?" What is this "proper sum of all three" value you mention??? Be specific. Your prized "sum" value remains undefined.

3) "Now continue running up the amplitude of modulation into the BFM realms with the signal spread out over 200 kHz bandwidth. What is the correct S-Meter reading?" What is even the point of that question? The S-meter couldn't (and shouldn't) care less about bandwidth.

4) "Does that reading change when the announcer pauses for breath? Should it?" The simple answer is "no", at least not for a transmission with a steady FM carrier, given that by definition the modulation on any FM signal should never exceed the strength of the carrier. Once again - the S-meter should only report the strongest signal measured anywhere in the passband. For an FM (or AM) signal, the strongest signal will always be the carrier.

You're asking me these questions, but you (or anyone else) can easily see the answers to every one of those questions by simply opening a session of SDRC and click on any BCFM or BCAM station. If the carrier is steady then the S-meter reading will also be steady, regardless of the amount of modulation and regardless of bandwidth.

If anyone has gone off a cliff, it certainly isn't me!

Mark 


Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

On 20210705 10:43:26, oldjackbob@... wrote:
On Mon, Jul 5, 2021 at 09:26 AM, Bob Dengler wrote:
I strongly disagree. How else is one supposed to make total channel power measurements for radiometry? SDRs aren't just for communications, & any developer that codes their SDR apps otherwise is hamstringing their full potential. Right now the only apps I know of that can do this are HDSDR & SDRuno. HDSDR is compatible with all my SDRs so that covers my needs, but it would be nice if SDRC could display & record average channel power readings as well as HDSDR is fairly useless for NBFM monitoring (no de-emphasis).

I'll have to go through the forum archives to see if this has been requested, & do so if not.

Bob NO6B
Please define "average power". I've also seen the term "integrated power" bandied about in the Flex forums. There is no established definition for either term.

The total power in a given bandwidth cannot be properly derived from a spectrum display. It can be derived easily from a filter followed by demodulator design. You take the I and Q values, square them, and sum them. That gives you the power in arbitrary units that can be calibrated easily. That is the total, or if you want to be obscure "integrated", power within the receiver's bandwidth. It is also the power as used in an AGC system if it really keeps loudness more or less constant. Picking a single spectrum element can mess AGC systems, too.

The function of an S-meter is not to report the "total power" or "average power" or "integrated power" in the passband, it is to report the highest voltage measured anywhere in the passband, irrespective of any nebulous "total power" contained within the filter. That's what Simon's S-meter does.

Whereinell do you get that notion? It has NO compatibility with how well you are receiving a signal, the Eb/N0 reading.

Per the definition established in IARU Region 1 Technical Recommendation R.1, "the metering system shall be based on quasi-peak detection". Notice the reference to "peak detection". There is no "average power" mentioned anywhere in the definition. A correctly designed S-meter by definition reports only the peak signal strength detected, nothing more and nothing less.

They are speaking time domain. You are speaking frequency domain. They are not the same thing.

As Simon has stated long ago, if anyone wants anything else reported (such as a "total power") he would be glad to look into that, as a separate meter. But his S-meter has always been in strict compliance with the published definition.

He is not compliant with that IARU definition. He has something sort of useful. It is NOT compliant.

Mark

{^_^}


Re: 3D waterfall

jdow
 

Probably they do match in terms of power per pixel. The number of pixels wide makes a difference in levels.
{o.o}

On 20210705 09:15:00, Bart AA7VA wrote:
I find it interesting, and played with it for awhile.  Wasn't sure where in the band, or band width, was showing, but comparisons with the waterfall soon rectified that.
One thing that might help, the background noise (noise floor) does not match that in the waterfall it seems.  I need to adjust the waterfall to see the noise a bit to help in locating signals on the 3D - maybe some freq numbers, or other locating device could be added?  And/or a slide to adjust the background noise level in the 3D separate from the waterfall one? Using the "Auto" button on the left of main panel makes the 3D have zero background to help see the weak signals, so the suggested slide or a bit more gain in the base 3D setting may be of assistance.
Looks like a nifty addition, not sure if I will use it a lot, but interesting to play with.
Thanks for the toy Simon!


Re: 3D waterfall OT

jdow
 

I wish you had not mentioned that. I had to go looking. And unfortunately what has been seen cannot be unseen. AAAAAAIIIIIIIEEEEEEEEEE! My eyes my eyes they burn.
{+_+}

On 20210705 09:01:10, Gisle Vanem wrote:

On Mon, Jul 5, 2021 at 05:51 PM, David J Taylor wrote:

...in some [Windows] programs

A MFC-program? Must be old Office-2007 type of programs.

I would be disappointed if SDR Console didn't conform to that convention.

SDR-Console uses MFC v14 I believe. And the MFC Library supports the
Microsoft Office Fluent User Interface which modern Office programs uses.
Maybe this Fluent UI has some more advanced options for such things.



Re: 3D waterfall OT

jdow
 

Minimizing does not do what should be done.
{o.o}

On 20210705 08:49:23, David J Taylor via groups.io wrote:
On 05/07/2021 16:37, Gisle Vanem wrote:
Select /Minimize the Ribbon/:

Thanks, but there is a standard way of minimising the ribbon in some [Windows] programs - the small up and down arrows on the right-hand side.  I would be disappointed if SDR Console didn't conform to that convention.

Cheers,
David


Re: SNR meter, bandwidth and gain adjustment for transverters

jdow
 

So if you have a signal that features multiple peaks all about the same amplitude how big is the S-Meter error? Take an NFM signal modulated by a sine wave. Run up the modulation from zero until there are three spikes showing within the NFM bandwidth that are all the same level. What is the correct measurement? One of the peaks or the proper sum of all three? Now continue running up the amplitude of modulation into the BFM realms with the signal spread out over 200 kHz bandwidth. What is the correct S-Meter reading? Does that reading change when the announcer pauses for breath? Should it? Mark, I think you went off the cliff on that one.

{^_^}

On 20210705 07:43:04, oldjackbob@... wrote:
Per the info on Simon's page explaining the operation of the S-meter, "[The signal level] is the peak spectrum FFT bin (output value) which is within the current filter."

That page is found here: https://www.sdr-radio.com/s-meter

Simon explains it clearly. There is no correlation of peak FFT bin value to filter bandwidth (or AGC level, or any other consideration), nor should there be. Any modern SDR-based S-meter that changes its reading based on filter bandwidth is doing it wrong.

I've said it before: Simon got it right, many others are getting it wrong.

Mark


 



Re: SNR meter, bandwidth and gain adjustment for transverters

Conrad, PA5Y
 

I did not see this post before. What Ingolf describes is exactly what is needed, and I am sure would attract many new users. I am just building a microwave EME system(4.5m solid dish) and I would be delighted to have such a useful feature.

 

Regards

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of sm6fhz via groups.io
Sent: 05 July 2021 21:27
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

 

Hi.
I made a request for this (Continuum mode) in 2014 together with a basic specification of possible functions.
It can be found here:
https://sdr-radio.groups.io/g/main/message/23048
I hope it can make a baseline fore further development of a in dept specification.
73 / Ingolf, SM6FHZ


Re: SNR meter, bandwidth and gain adjustment for transverters

Conrad, PA5Y
 

Simon continuum mode is very useful for sun noise measurements or sun>cold sky for the EME boys. However, it is comparative, it does not need to be calibrated. It merely plots received power over time. It would be a very welcome addition indeed. It would of course be great if it could be calibrated as well. But for EME the relative measurements between cold sky and any celestial source can be used for Y factor calculations. This can then be used to see if any improvements are truly effective. Also good for checking that all is still working as expected.

Regards

Conrad PA5Y

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown via groups.io
Sent: 05 July 2021 18:37
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

Bob,

Is this Continuum mode? I would need an exact specification were I to add this.

Simon Brown, G4ELI
https://www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Bob Dengler
Sent: 05 July 2021 17:26
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

At 7/5/2021 07:43 AM, you wrote:
Per the info on Simon's page explaining the operation of the S-meter,
"[The
signal level] is the peak spectrum FFT bin (output value) which is within the current filter."That page is found here:Â <https://www.sdr-radio.com/s-meter>https://www.sdr-radio.com/s-meterSimon
explains it clearly. There is no correlation of peak FFT bin value to filter bandwidth (or AGC level, or any other consideration), nor should there be.
Any modern SDR-based S-meter that changes its reading based on filter bandwidth is doing it wrong.I've said it before: Simon got it right, many others are getting it wrong.Mark

I strongly disagree. How else is one supposed to make total channel power measurements for radiometry? SDRs aren't just for communications, & any developer that codes their SDR apps otherwise is hamstringing their full potential. Right now the only apps I know of that can do this are HDSDR & SDRuno. HDSDR is compatible with all my SDRs so that covers my needs, but it would be nice if SDRC could display & record average channel power readings as well as HDSDR is fairly useless for NBFM monitoring (no de-emphasis).

I'll have to go through the forum archives to see if this has been requested, & do so if not.

Bob NO6B










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


Re: 3D waterfall OT

jdow
 

No, you aren't the only one. As I see it the ribbon is a triumph of wasted screen space dedicated to cute rather than function.

{o.o}

On 20210705 06:50:26, ronwhat wrote:
Jdow, am I the only one who prefers the old menu system rather than the MS Ribbon? In Word or Excel, I knew where to find any menu item I used…it was always there. Then came the Ribbon, with no option to choose it or the old menu bar. Now it is often a real effort to find which ribbon I need to go to in order to access an item that I don’t use regularly. I think the ribbon function should include option for old style menu listing of all commands, gray out any that are not valid at the point in the program.

Now, returning to your regularly scheduled topic. End OT.

Ron Biddle
KA4RON

On Jul 4, 2021, at 8:41 PM, jdow <jdow@...> wrote:

 May I suggest to you that you take a slow cruise through the menu system. You might discover a whole lot of goodies you had no idea were there. (I am sure somebody else has already pointed out that its on the view menu or "ribbon bar".)

{^_^}

On 20210704 03:55:41, Jos Stevens wrote:


Please, where to find that magic button to activate the 3D display, I searched long but can't find it.

Thanks,

Jos


Op 3-7-2021 om 23:07 schreef jdow:
What is stupid about the window can be put away, dismissed? I did not mean it can be removed from SDRC. It's not mandatory that the window be up if you do not want it.
{O.O}

On 20210703 04:54:28, Jens wrote:
 
... NO , 3D should get some more development !
 
SDR-Console is one of the best outstanding SDR application , maybe the best !!!
Instead making always reclamation ... it`s better to think about donation for
Simon and his great continously work !!!
 
I don`t like and have enough about stupid comments here ...
 
73 , Jens / HB9JOI
 
+++
 
 
From: jdow
Sent: Saturday, July 3, 2021 1:23 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall
 
The window can be dismissed.
{^_^}

On 20210702 08:27:03, David J Taylor via groups.io wrote:
On 02/07/2021 13:48, Francesco Di Giovanni wrote:
I find the 3D waterfall the most useless feature, only choreography.
[]

73
Francesco Di Giovanni - IN3XZP

Can you disable it?  I've not had chance to test as yet.

David GM8ARV



Virusvrij. www.avast.com



Re: 3D waterfall

jdow
 

I am thinking of other things like the matrix display, various data displays, and so forth.
{o.o}

On 20210705 04:50:45, Jos Stevens wrote:


Yes I found it, thanks.

Jos

Op 5-7-2021 om 02:40 schreef jdow:
May I suggest to you that you take a slow cruise through the menu system. You might discover a whole lot of goodies you had no idea were there. (I am sure somebody else has already pointed out that its on the view menu or "ribbon bar".)

{^_^}

On 20210704 03:55:41, Jos Stevens wrote:


Please, where to find that magic button to activate the 3D display, I searched long but can't find it.

Thanks,

Jos


Op 3-7-2021 om 23:07 schreef jdow:
What is stupid about the window can be put away, dismissed? I did not mean it can be removed from SDRC. It's not mandatory that the window be up if you do not want it.
{O.O}

On 20210703 04:54:28, Jens wrote:
 
... NO , 3D should get some more development !
 
SDR-Console is one of the best outstanding SDR application , maybe the best !!!
Instead making always reclamation ... it`s better to think about donation for
Simon and his great continously work !!!
 
I don`t like and have enough about stupid comments here ...
 
73 , Jens / HB9JOI
 
+++
 
 
From: jdow
Sent: Saturday, July 3, 2021 1:23 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall
 
The window can be dismissed.
{^_^}

On 20210702 08:27:03, David J Taylor via groups.io wrote:
On 02/07/2021 13:48, Francesco Di Giovanni wrote:
I find the 3D waterfall the most useless feature, only choreography.
[]

73
Francesco Di Giovanni - IN3XZP

Can you disable it?  I've not had chance to test as yet.

David GM8ARV



Virusvrij. www.avast.com



Re: SNR meter, bandwidth and gain adjustment for transverters

Conrad, PA5Y
 

Well I disagree, SNR improves as you reduce bandwidth, this is just physics. If the metering does not reflect this then the SNR metering is simply wrong. Just use your ears.

 

Conrad

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of oldjackbob via groups.io
Sent: 05 July 2021 16:43
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

 

Per the info on Simon's page explaining the operation of the S-meter, "[The signal level] is the peak spectrum FFT bin (output value) which is within the current filter."

That page is found here: https://www.sdr-radio.com/s-meter

Simon explains it clearly. There is no correlation of peak FFT bin value to filter bandwidth (or AGC level, or any other consideration), nor should there be. Any modern SDR-based S-meter that changes its reading based on filter bandwidth is doing it wrong.

I've said it before: Simon got it right, many others are getting it wrong.

Mark

 


Re: 3D waterfall

Conrad, PA5Y
 

Tha’ what? Nowt up wit Yorkshire accent, it wor designed t keeyup sutheners guessin.

 

Ok looks worse when you write it down.

 

Regards

 

Conrad PA5Y(orkshire)

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow via groups.io
Sent: 05 July 2021 12:34
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall

 

Yorkshire, Yorky(?), accent gets me. "What did he say?"

And indeed heavy use of ALC is REALLY REALLY REALLY bad. The needle should quiver perhaps once every ten to thirty seconds if at all.

{^_^}

On 20210705 03:29:37, Simon Brown wrote:

Thinking… could be driving an amp with ALC (bets to not use ALC, just reduce drive).

 

Next time please make a note etc. Now listening to 75m early bird nets. Struggling with some of the southern accents!

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU
Sent: 05 July 2021 04:00
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall

 

I just wish operators of FTDX10's could learn how NOT to QRM the band!
I have found ONLY ONE user of the FTDX10 that did NOT have a lousy signal...

Exhibit A:



The IC-7300's always have a nice 3kHz signal.

Just my humble observations.

73 Kriss KA1GJU


--

- + - + -

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

 


Re: 3D waterfall

Conrad, PA5Y
 

There was a recent FW update for the FTDX-10 I understand. I have some TX composite noise measurements from Rob Sherwood and it looks very clean, no sure if it is public domain but I am sure if you asked him he would provide it. It is good.

 

Regards

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown via groups.io
Sent: 05 July 2021 06:16
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall

 

Ah,

 

Shame – the FTDX-10 has a different PA module to the FTDX-101, I was hoping it would be clean .

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU
Sent: 05 July 2021 04:00
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall

 

I just wish operators of FTDX10's could learn how NOT to QRM the band!
I have found ONLY ONE user of the FTDX10 that did NOT have a lousy signal...

Exhibit A:



The IC-7300's always have a nice 3kHz signal.

Just my humble observations.

73 Kriss KA1GJU


--

- + - + -

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


Re: SNR meter, bandwidth and gain adjustment for transverters

Bob Dengler
 

At 7/5/2021 12:06 PM, you wrote:
Please define 'average channel power'.
See SM6FHZ Ingolf's message a few minutes after mine; for quick reference here is the posting: <<https://sdr-radio.groups.io/g/main/message/23048>https://sdr-radio.groups.io/g/main/message/23048>. I think he is asking for a little more than I am but my request is basically the same: recording average channel power over time.

By "average channel power" I mean the amount of power a calorimetric power meter would record if the channel power were to be fed to one. There is the issue of integration time: I'd say the average power read by such a power meter over that integration time is what we're looking for.

Bob NO6B


Re: SNR meter, bandwidth and gain adjustment for transverters

sm6fhz
 

Hi.
I made a request for this (Continuum mode) in 2014 together with a basic specification of possible functions.
It can be found here:
https://sdr-radio.groups.io/g/main/message/23048
I hope it can make a baseline fore further development of a in dept specification.
73 / Ingolf, SM6FHZ

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