Date   

Fw: REQUEST OF HELP

ik2pcumaurizio@...
 

 
 
 
Good morning I am Maurizio IK2PCU from Milano
I need help for the connection between SDR CONSOLE and RS41 to receive radiosonde ,i use a usb receiver RTL2832U, i have a good signal with SDR CONSOLE but RS41 refuse to decode ,i use as audio channel virtual cable ,correctly setting on SDR CONSOLE, level in win 10 is set for max signal ,but examinating the signal with the icon oscilloscope on RS41 the audio level result low and poor and RS41 not decode .Could you suggest setting for SDR CONSOLE and wich control i must apply?
Thank you and best regrds  73
Maurizio

Mail priva di virus. www.avg.com


REQUEST OF HELP

ik2pcumaurizio@...
 

Good morning I am Maurizio IK2PCU from Milano
I need help for the connection between SDR CONSOLE and RS41 to receive radiosonde ,i use a usb receiver RTL2832U, i have a good signal with SDR CONSOLE but RS41 refuse to decode ,i use as audio channel virtual cable ,correctly setting on SDR CONSOLE, level in win 10 is set for max signal ,but examinating the signal with the icon oscilloscope on RS41 the audio level result low and poor and RS41 not decode .Could you suggest setting for SDR CONSOLE and wich control i must apply?
Thank you and best regrds  73
Maurizio

Mail priva di virus. www.avg.com


Re: External Radio / Omnirig has become unstable.

HERB KEATON N2GEW
 

I decided to try and understand what might be going on with the external radio function / OmniRig within SDRC.
Let's hope that I didn't overstep what I can do.

I thought to establish the basic connection between the radio, computer, OmniRig and
SDRC first. That is, before I introduce any additional software's that will require a
virtual serial port pair to coordinate. And perhaps 2nd rig settings in OmniRig. 

So I have the TS-990S to the computer with the USB cable, which installed Silicone Labs
CP210X USB to UART Bridge (Com8). I deleted the third party serial port and radio in
the copy of HRD I have on the desktop, to be dealt with later. I configured the port
settings for the radio, Com Port driver, and OmniRig to be all the same/correct. Further,
I adjusted all the power management settings for the USB port and Com Port 8 not
to "allow the computer to turn off the device to save power".

The basic setup through OmniRig and Com Port 3 is up and running. 45 minutes in
I decided to open a browser and do this email and shortly thereafter, I get the USB
connection notification and checking, there is "not-responding" reported in the
external radio window. I re-start the SDRC program to put the radio back online. 

Coincidental timing with the multitasking or another issue on losing the handshake?
I guess time will tell. But I want to figure this out before introducing another piece
to the puzzle.
Herb
N2GEW


Re: SDR operated with a noise source

jdow
 

I don't see here that you understand noise at all well, especially the characterization and measurement of noise. First off, S9+30 dB is in practical terms no more descriptive than, "You have a bodacious signal, OM." My experience with giving calibrated signal level reports and how poorly they were received suggests a properly calibrated S9 point is about as likely as a purple unicorn poaching your breakfast cereal.

However, -43 dBm is a fairly large number. If it really is 10 GHz wide then it's level in a 1 Hz bandwidth is about -143 dB. Yeah, that's a fair number to survive insertion of some attenuators for an accurate measurement process. (Boltzmann noise, which you cannot go below, is about -174 dBm, -204 dBm. Note: That's dBm not S "-7" or something. S-Units are "good buddy" measurements for somebody interested in any degree of precision.) Including or not including the bottom 100 MHz is not easily measured compared to leaving out the bottom 100kHz or bottom 1 Hz. The formula for Boltzmann noise is kTB, k = Boltzmann's constant, T is temperature degrees Kelvin, and B is the bandwidth in question.

Hopefully you see the "oops" above. I left out your S9+30 measurement. I don't know the bandwidth you used for measurement. Let's figure you used 10k kHz for AM measurements. Move that up to a 10 GHz bandwidth and you are talking about 60 dB more noise power over that whole 10 GHz bandwidth - it becomes a bit under 1 watt, actually +23 dBm. That is a ridiculously high power level for a noise generator. To measure a noise figure you want a noise source roughly equal in power to the noise figure you wish to measure. Since it would be generating noise at -83 dBm/Hz it's not good for noise figure measurement.

That thumbnail analysis is why I figure you are groping in the dark. There are a lot of good articles to read on the web. Some will probably be at a good starting level for gaining a quick study level of knowledge. And even the highly technical ones are not all that hard to understand when you extract the fundamental numbers and formulas.

{^_^}

On 20210115 03:53:01, Allan Isaacs wrote:

That’s more or less what I expected. The SDR meter provides a jolly useful measure of change and not anything absolute.

I began to get interested in this topic when discussing the Tiny 2.8 Spectrum Analyser that has no tracking generator unlike my Rigol.

 

I built a noise source that seems to work OK and provides, after some iterations, a reliable output from around 40KHz to a couple of GHz so should enable the Tiny SA (or other things, even SDRs) to check things like filters.

I’ve been using my Rigol as well as my SDR and both give the same subjective results (in other words both provide equal filter test characteristics) but with the Rigol giving accurate power readings or attenuation figures.

One point of interest is the total power from the noise source. Although the power level is not especially high at any given frequency, for example it shows as S9 +30dB on a decent communications receiver from 100KHz to 30MHz, it develops 1mW (0dBm) as measured by my HP power meter (10MHz to 10GHz). If the power meter spec covered 0-10GHz that 0dBm figure would register a higher output, perhaps as high as +10dBm? That means that it would be a bad idea to further amplify the noise output for fear of accidentally damaging a spectrum analyser which typically has a max input rating of 20dBm.

Allan G3PIY

 


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of jdow
Sent: 15 January 2021 10:25
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

 

Until you calibrate it there is no way SDRC can be thought of as being calibrated.

Without a thorough of what Simon is displaying you cannot take the spectrum levels as meaningful.

Without an even more detailed knowledge of the S-Meter function you cannot track it back to anything meaningful, pretty much the same as your average rice box. (I have managed to completely fool Simon's S-Meter tool by 20 dB or more. Unless he changed it the tool is merely a "keep the bloody ignorant hams whining about wanting an S-Meter shut up.)

SDRC is very pointedly not a measurement system giving precise readings of power. And it probably cannot be converted into such a thing without a gawdawful amount of work.

But, you are welcome to try.
{^_^}

 



Re: SDR operated with a noise source

Allan Isaacs
 

That’s more or less what I expected. The SDR meter provides a jolly useful measure of change and not anything absolute.

I began to get interested in this topic when discussing the Tiny 2.8 Spectrum Analyser that has no tracking generator unlike my Rigol.

 

I built a noise source that seems to work OK and provides, after some iterations, a reliable output from around 40KHz to a couple of GHz so should enable the Tiny SA (or other things, even SDRs) to check things like filters.

I’ve been using my Rigol as well as my SDR and both give the same subjective results (in other words both provide equal filter test characteristics) but with the Rigol giving accurate power readings or attenuation figures.

One point of interest is the total power from the noise source. Although the power level is not especially high at any given frequency, for example it shows as S9 +30dB on a decent communications receiver from 100KHz to 30MHz, it develops 1mW (0dBm) as measured by my HP power meter (10MHz to 10GHz). If the power meter spec covered 0-10GHz that 0dBm figure would register a higher output, perhaps as high as +10dBm? That means that it would be a bad idea to further amplify the noise output for fear of accidentally damaging a spectrum analyser which typically has a max input rating of 20dBm.

Allan G3PIY

 


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of jdow
Sent: 15 January 2021 10:25
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

 

Until you calibrate it there is no way SDRC can be thought of as being calibrated.

Without a thorough of what Simon is displaying you cannot take the spectrum levels as meaningful.

Without an even more detailed knowledge of the S-Meter function you cannot track it back to anything meaningful, pretty much the same as your average rice box. (I have managed to completely fool Simon's S-Meter tool by 20 dB or more. Unless he changed it the tool is merely a "keep the bloody ignorant hams whining about wanting an S-Meter shut up.)

SDRC is very pointedly not a measurement system giving precise readings of power. And it probably cannot be converted into such a thing without a gawdawful amount of work.

But, you are welcome to try.
{^_^}

 


Re: SDR operated with a noise source

jdow
 

Until you calibrate it there is no way SDRC can be thought of as being calibrated.

Without a thorough of what Simon is displaying you cannot take the spectrum levels as meaningful.

Without an even more detailed knowledge of the S-Meter function you cannot track it back to anything meaningful, pretty much the same as your average rice box. (I have managed to completely fool Simon's S-Meter tool by 20 dB or more. Unless he changed it the tool is merely a "keep the bloody ignorant hams whining about wanting an S-Meter shut up.)

SDRC is very pointedly not a measurement system giving precise readings of power. And it probably cannot be converted into such a thing without a gawdawful amount of work.

But, you are welcome to try.
{^_^}

On 20210114 07:40:58, Allan Isaacs wrote:
Hi Willi
I tried lots of settings, visual gain and receiver gain, bandwidth etc but
the meter consistently read 6dB or more too high compared with the trace..
I then set the receiver to 500KHz scan with AM bandwidth to 2Hz and the
meter read correctly. Switching to AM 20KHz and it read 10dB too high.
I guess the meter is only good for comparative readings on a proper signal
but on noise you need to look at the trace and read off the vertical
scales..
If there was a trimmer so that you could tweak the meter to read the same as
the trace it would be nice, but I'm only experimenting with a noise source
to take the place of a tracking generator..
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 13:38
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan,
As I understand it, values would be equal only if you could select the
same bandwidth for the spectrum range and the demodulation range. But
you can try and tell us what you find out :-)

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:47 schrieb Allan Isaacs:
That does seem to make sense Willi.
If I measure the noise source with a wideband power meter it tells me it
is
0dBm so the noise within the selected bandwidth of the SDR at 190KHz is
summed over the 3.5KHz setting of the selected AM mode.. Presumably, all
things being equal, if I selected CW 50Hz the meter reading would be
closer
to that shown in the display?
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 12:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan, the different readings probably are related to different
bandwidths. 190 kHz for the spectrum and waterfall display, but maybe 3
kHz (or whatever you selected) for the demodulated signal that the S
meter reflects.

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:25 schrieb Allan Isaacs:
The noise signal looks like -116dBm at 190KHz and the meter shows
-109.7dBm.


















Re: SDR operated with a noise source

Allan Isaacs
 

Not really
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Alan G4ZFQ
Sent: 14 January 2021 16:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

I tried lots of settings, visual gain and receiver gain, bandwidth etc but
the meter consistently read 6dB or more too high
Allan
Does this not help?

https://www.sdr-radio.com/s-meter

73 Alan G4ZFQ


Re: Multiple TM-2 Controllers

Simon Brown
 

No,

 

Sorry.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Francesco Di Giovanni
Sent: 14 January 2021 17:51
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Multiple TM-2 Controllers

 

Hi,
is it possible to run more than oneTM-2 controller?

73
Francesco, IN3XZP


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


Multiple TM-2 Controllers

Francesco Di Giovanni
 

Hi,
is it possible to run more than oneTM-2 controller?

73
Francesco, IN3XZP


Multiple TM-2 Controllers

Francesco Di Giovanni
 

Hi,
is it possible to run more than oneTM-2 controller?

73
Francesco, IN3XZP


Re: SDR operated with a noise source

Alan G4ZFQ
 

I tried lots of settings, visual gain and receiver gain, bandwidth etc but
the meter consistently read 6dB or more too high Allan
Does this not help?

https://www.sdr-radio.com/s-meter

73 Alan G4ZFQ


Re: SDR operated with a noise source

Allan Isaacs
 

Hi Willi
I tried lots of settings, visual gain and receiver gain, bandwidth etc but
the meter consistently read 6dB or more too high compared with the trace..
I then set the receiver to 500KHz scan with AM bandwidth to 2Hz and the
meter read correctly. Switching to AM 20KHz and it read 10dB too high.
I guess the meter is only good for comparative readings on a proper signal
but on noise you need to look at the trace and read off the vertical
scales..
If there was a trimmer so that you could tweak the meter to read the same as
the trace it would be nice, but I'm only experimenting with a noise source
to take the place of a tracking generator..
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 13:38
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan,
As I understand it, values would be equal only if you could select the
same bandwidth for the spectrum range and the demodulation range. But
you can try and tell us what you find out :-)

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:47 schrieb Allan Isaacs:
That does seem to make sense Willi.
If I measure the noise source with a wideband power meter it tells me it
is
0dBm so the noise within the selected bandwidth of the SDR at 190KHz is
summed over the 3.5KHz setting of the selected AM mode.. Presumably, all
things being equal, if I selected CW 50Hz the meter reading would be
closer
to that shown in the display?
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 12:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan, the different readings probably are related to different
bandwidths. 190 kHz for the spectrum and waterfall display, but maybe 3
kHz (or whatever you selected) for the demodulated signal that the S
meter reflects.

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:25 schrieb Allan Isaacs:
The noise signal looks like -116dBm at 190KHz and the meter shows
-109.7dBm.







Re: SDR operated with a noise source

Willi Passmann
 

Allan,
As I understand it, values would be equal only if you could select the
same bandwidth for the spectrum range and the demodulation range. But
you can try and tell us what you find out :-)

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:47 schrieb Allan Isaacs:

That does seem to make sense Willi.
If I measure the noise source with a wideband power meter it tells me it is
0dBm so the noise within the selected bandwidth of the SDR at 190KHz is
summed over the 3.5KHz setting of the selected AM mode.. Presumably, all
things being equal, if I selected CW 50Hz the meter reading would be closer
to that shown in the display?
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 12:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan, the different readings probably are related to different
bandwidths. 190 kHz for the spectrum and waterfall display, but maybe 3
kHz (or whatever you selected) for the demodulated signal that the S
meter reflects.

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:25 schrieb Allan Isaacs:
The noise signal looks like -116dBm at 190KHz and the meter shows
-109.7dBm.






Re: RX-888 windows driver

jdow
 

That will be an interesting challenge for  USB3, 2 Gbps.

{^_^}

On 20210114 03:46:03, Alan G4ZFQ wrote:
that’s what attracts me to the RX888
i note the LTC2208 samples at 125MHz in the QS1R giving a spectrum of ~ 62 MHz

Paul,

I think they are working on 60MHz span for the next creation.
You really need to look at Oscar's site to see what is happening.
(I suspect Simon knows.)
https://sdr-prototypes.blogspot.com/

73 Alan G4ZFQ






Re: SDR operated with a noise source

Allan Isaacs
 

That does seem to make sense Willi.
If I measure the noise source with a wideband power meter it tells me it is
0dBm so the noise within the selected bandwidth of the SDR at 190KHz is
summed over the 3.5KHz setting of the selected AM mode.. Presumably, all
things being equal, if I selected CW 50Hz the meter reading would be closer
to that shown in the display?
Allan G3PIY

-----Original Message-----
From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf
Of Willi Passmann
Sent: 14 January 2021 12:35
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SDR operated with a noise source

Allan, the different readings probably are related to different
bandwidths. 190 kHz for the spectrum and waterfall display, but maybe 3
kHz (or whatever you selected) for the demodulated signal that the S
meter reflects.

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:25 schrieb Allan Isaacs:
The noise signal looks like -116dBm at 190KHz and the meter shows
-109.7dBm.


Re: RX-888 windows driver

N8CVW
 

Alan,

kind thanks for the link !

On Jan 14, 2021, at 6:46 AM, Alan G4ZFQ <alan4alan@gmail.com> wrote:



that’s what attracts me to the RX888
i note the LTC2208 samples at 125MHz in the QS1R giving a spectrum of ~ 62 MHz
Paul,

I think they are working on 60MHz span for the next creation.
You really need to look at Oscar's site to see what is happening.
(I suspect Simon knows.)
https://sdr-prototypes.blogspot.com/

73 Alan G4ZFQ





Re: SDR operated with a noise source

Willi Passmann
 

Allan, the different readings probably are related to different
bandwidths. 190 kHz for the spectrum and waterfall display, but maybe 3
kHz (or whatever you selected) for the demodulated signal that the S
meter reflects.

vy 73,
Willi, DJ6JZ

Am 14.01.2021 um 13:25 schrieb Allan Isaacs:

The noise signal looks like -116dBm at 190KHz and the meter shows
-109.7dBm.


SDR operated with a noise source

Allan Isaacs
 

I notice my SDR-Play when fed with a home brew noise source gives signal strength readings that do not match the display.
Generally the meter indicates some 6 to 10dBm higher than the display. This also is the case with the noise source switched off and just baseline background noise.
With the noise source switched off the baseline noise may be at -125dBm but the meter indicates -119dBm. Typically, attached is a picture of the noise source used with a low pass filter. The noise signal looks like -116dBm at 190KHz and the meter shows -109.7dBm.
Is this explainable?
Allan G3PIY


Re: RX-888 windows driver

Alan G4ZFQ
 

that’s what attracts me to the RX888
i note the LTC2208 samples at 125MHz in the QS1R giving a spectrum of ~ 62 MHz
Paul,

I think they are working on 60MHz span for the next creation.
You really need to look at Oscar's site to see what is happening.
(I suspect Simon knows.)
https://sdr-prototypes.blogspot.com/

73 Alan G4ZFQ


Re: RX-888 windows driver

N8CVW
 

Bert,

that’s what attracts me to the RX888

i note the LTC2208 samples at 125MHz in the QS1R giving a spectrum of ~ 62 MHz

I’m guessing the reason the RX888 is limited to 32MHz is lack of hardware DDC (?)

thanks for commenting !

Paul
N8CVW

On Jan 14, 2021, at 5:13 AM, Bert Vierhout <bert.vierhout@...> wrote:


The RX888 has very big bandwith. In my opinion is that the only plus above the airspy hf+ discovery. 

Bert



Verzonden vanaf mijn Galaxy


-------- Oorspronkelijk bericht --------
Van: N8CVW <n8cvw.gbmi@...>
Datum: 14-01-2021 09:42 (GMT+01:00)
Aan: main@sdr-radio.groups.io
Onderwerp: Re: [SDR-Radio] RX-888 windows driver

Hi All,

Does anyone know the MDS of RX-888, and whether performance is favorable to the Airspy HF+ ?

kind thanks 

Paul
N8CVW

On Jan 14, 2021, at 1:21 AM, Simon Brown <simon@...> wrote:



Hi,

 

It’s really up to you, select from:

 

  • HDSDR,
  • An older version of SDR# (build 1740 I think),
  • SDR Console.

 

Regarding SDR Console – support in 3.0.27 will be a lot better, I may release 3.0.27 on Monday after more testing.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Francois Michaud-Herbst via groups.io
Sent: 14 January 2021 03:20
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] RX-888 windows driver

 

I ordered a RX-888 and what to know what is the best software to use it especialy in HF
Thanks
Francois


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

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