1. main@SDR-Radio.groups.io
  2. Messages
   Date   
Re: SDRC and Airspy R2

Kriss Kliegle KA1GJU
 

I find with the R2 I have (on Super Station #4) that I have to run the gain at 15 +/- 1 or 2 to keep a hiss free FM RXR. Any more than that, local high power FM stations will overwhelm the RXR and hisses, less than that... hiss.

The R2's gain is adjustable, "HOME" on the ribbon bar, then adjust gain. See attached screen shot of 99.5FM, right next to a powerhouse on 100.3FM.

73 Kriss KA1GJU

Re: SDRC and Airspy R2

David J Taylor
 

On 08/07/2022 22:00, George Stein - NJ3H via groups.io wrote:
Thanks Simon.

Never could clear up the hiss on the R2.  The HF+ Discovery sure does a much
better job than the R2, both on SDRC and SDR#.

I will say I am under impressed with the R2.

Regards,
George
George,

You could try running the Airspy R2 at the 2.5 Msps rate. It /might/ be a SUB
issue.

David
GM8ARV
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

Re: Off-topic from SDRC

Jim Smith G0OFE
 

Anydesk is my remote-ing software of choice.


There is also Teamviewer, but in recent years they have been very touchy with regards to any percieved possible commercial use and I had to stop using it.

================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF

On 08/07/2022 21:39, George Stein - NJ3H via groups.io wrote:

Greetings, 

I decided to ask my question on this forum since I always receive prompt answers and good information. 

Does anyone know of a free service where I can listen to my SDRs while away while running them on my home desktop.

I have a VNC set up, and I can easily run the various SDRs, but that system does not have audio capability.

Any ideas are most welcome. 

Regards, 
George 

Re: SDRC and Airspy R2

Simon Brown
 

OK,

For RSPdx use the AGC. For S2 try LPF off. For Airspy increase the gain.

All these radios are different...
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <nj3h@...>
Sent: 09 July 2022 08:08
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] SDRC and Airspy R2
 
Simon and others,

I have attached 3 pictures all with Console running.

Elad S2,
Airspy R2
RSPdx


The RSPdx is the only on of these three that has a decent signal. Running uno is fine also.

It is the other two that are causing problems.  The native software yields the same lousy signals.  There is a lot of noise on these two receivers for the station in question. I have fiddles with the R2 slide controls in both Sharp and Console. The Elad appears not to have any RF gain capability.

The frequency I am using for this exercise is 98.9, 92 watts, 25 km away.  I am using the same antenna for all three radios.  The antenna is pictured in an attachment. Same feed line to all three radios. My HF+ Discovery works fine also.

As I said in a previous message, the Elad S2 is the one that really puzzles me.  I would have expected it to come out the best (based only on price, that is).

Anyway, please let me know if more information is needed.

Thanks for looking into this.

Regards,
George



On Friday, July 8, 2022 at 11:38:57 PM PDT, jdow <jdow@...> wrote:


Frequency?

{o.o}

On 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.


On Fri, Jul 8, 2022 at 2:24 PM, George Stein -  NJ3H via groups.io
<nj3h@...> wrote:
Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
Re: SDRC and Airspy R2

George Stein - NJ3H
 

Simon and others,

I have attached 3 pictures all with Console running.

Elad S2,
Airspy R2
RSPdx


The RSPdx is the only on of these three that has a decent signal. Running uno is fine also.

It is the other two that are causing problems.  The native software yields the same lousy signals.  There is a lot of noise on these two receivers for the station in question. I have fiddles with the R2 slide controls in both Sharp and Console. The Elad appears not to have any RF gain capability.

The frequency I am using for this exercise is 98.9, 92 watts, 25 km away.  I am using the same antenna for all three radios.  The antenna is pictured in an attachment. Same feed line to all three radios. My HF+ Discovery works fine also.

As I said in a previous message, the Elad S2 is the one that really puzzles me.  I would have expected it to come out the best (based only on price, that is).

Anyway, please let me know if more information is needed.

Thanks for looking into this.

Regards,
George



On Friday, July 8, 2022 at 11:38:57 PM PDT, jdow <jdow@...> wrote:


Frequency?

{o.o}

On 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.


On Fri, Jul 8, 2022 at 2:24 PM, George Stein -  NJ3H via groups.io
<nj3h@...> wrote:
Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

Re: SDRC and Airspy R2

jdow
 

Frequency?

{o.o}

On 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:

92 watts not 25.


On Fri, Jul 8, 2022 at 2:24 PM, George Stein -  NJ3H via groups.io
<nj3h@...> wrote:
Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

Re: SDRC and Airspy R2

jdow
 

Sounds like you have not adjusted the respective front end gains correctly.

{o.o}

On 20220708 14:22:58, George Stein - NJ3H via groups.io wrote:

Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

Re: SDRC and Airspy R2

Simon Brown
 

Hi,

Add screenshots of the whole display, I need to see the settings. 
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <nj3h@...>
Sent: 08 July 2022 22:22
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] SDRC and Airspy R2
 
Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
Re: Off-topic from SDRC

Dennis Matzen
 

I use Chrome Remote Desktop
--
Dennis
KA6FUB

Re: SDRC and Airspy R2

George Stein - NJ3H
 

92 watts not 25.


On Fri, Jul 8, 2022 at 2:24 PM, George Stein -  NJ3H via groups.io
<nj3h@...> wrote:
Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

Off-topic from SDRC

George Stein - NJ3H
 

Greetings, 

I decided to ask my question on this forum since I always receive prompt answers and good information. 

Does anyone know of a free service where I can listen to my SDRs while away while running them on my home desktop.

I have a VNC set up, and I can easily run the various SDRs, but that system does not have audio capability.

Any ideas are most welcome. 

Regards, 
George 

Re: SDRC and Airspy R2

George Stein - NJ3H
 

Further to my last message.  The station in question is 25 km away and running a mere 25 watts. 

Using SDR Console:

With the Elad S2 and and the Airspy R2, the reception was very noisy.

With the Airspy HF+ Discovery and the RSPdx, the signal was full quieting. With the edge going to the HF+ Discovery.

This was not a scientific test, just a casual observation. The only thing I am surprised about was the Elad S2 performance.

I then used the native software for each device and had the same results.

Regards and YMMV,
George

Re: SDRC and Airspy R2

George Stein - NJ3H
 






Thanks Simon.

Never could clear up the hiss on the R2.  The HF+ Discovery sure does a much better job than the R2, both on SDRC and SDR#.

I will say I am under impressed with the R2.

Regards,
George

Re: SDRC and Airspy R2

Simon Brown
 

In the Receive panel on the left, scroll down to Radio.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <nj3h@...>
Sent: 08 July 2022 17:53
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] SDRC and Airspy R2
 
Greetings,

When I use SDRC with my R2, the does not seem to be any radio specific adjustments on the home screen.  The HF+ discovery does have radio specific adjustments on the Home screen.

Listening to both, for example, I find the following example using SDRC

98.9 Mhz station
on Discovery S7 with no hiss
on R2 S5 with a lot of hiss

The R2 has a gain control in SDR#, but as mentioned above SDRC doesn't have any R2 specific controls.

Am I missing something here?

Please seen the screen capture as created by SDRC.

Regards,
George

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

GARY W RUSSELL
 

It looks like SuperDarn (Super Dual Auroral Radar Network) which is used for scientific research.  It is also found near 11500 and other places in HF radio spectrum.  There is an example on the Sigidwiki:

Radar - Signal Identification Wiki (sigidwiki.com)

Gary

SDRC and Airspy R2

George Stein - NJ3H
 

Greetings,

When I use SDRC with my R2, the does not seem to be any radio specific adjustments on the home screen.  The HF+ discovery does have radio specific adjustments on the Home screen.

Listening to both, for example, I find the following example using SDRC

98.9 Mhz station
on Discovery S7 with no hiss
on R2 S5 with a lot of hiss

The R2 has a gain control in SDR#, but as mentioned above SDRC doesn't have any R2 specific controls.

Am I missing something here?

Please seen the screen capture as created by SDRC.

Regards,
George

Re: Mystery mode

Siegfried Jackstien
 

looks like VERY wide opera (yes thats also a spread spectrum mode)

dg9bfc sigi

Am 08.07.2022 um 14:14 schrieb Nicholas Shaxted:

You will find that type of signal quite regularly across hf up to the MUF.

It is, ahem, a spread spectrum signal and it is not OTHR, nor is it a frequency sweep for ionospheric sounding.

 

I am not sure if any amateur software wrangler has attempted to correlate these “blips”, but there might be someone.

Have you asked on Ary’s UDXF group?

 

Nick – g4ogi

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Ken Sejkora via groups.io
Sent: 08 July 2022 12:35
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Mystery mode

 

Greetings all,

I believe it's been asked before, does anyone have any idea of the short-duration blips as shown in the image below?  They span a 700 kHz range from about 14400 kHz to 15100 kHz, and appear to be spaced on discrete 'channels' anywhere from 6 to 10 kHz apart.  I assume it is some type of frequency-hopping spread spectrum mode.  Over-the-horizon radar?  Some new military/government voice mode?  I don't recall seeing it anywhere else across the  HF spectrum, but I seem to notice it here when I'm listening to 20-meter amateur band of 15 MHz WWV.  Usually observed between 1000 and 1400 UTC, but may occur at other times.

Thanks and 73
Ken -- WBØOCV
East Falmouth, MA  FN41ro
Re: Optimal RF filter placement/location

Simon Brown
 

For RX the cable from the antenna will pick up some signals, so...

For TX good luck with a 1kW BPF on the mast 🙂 .
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Ken Sejkora via groups.io <kjsejkora@...>
Sent: 08 July 2022 13:54
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] Optimal RF filter placement/location
 
Hello all,

Where is the 'best' location to insert an RF filter (high-pass, low-pass, band-reject, etc.) in the transmission line to obtain optimal performance?  At the point where the coax connects to the antenna, or at the other end where the coax enters the SDR/radio? Intuitively, reducing the unwanted signal at the antenna before the coax conveys the filtered signal to the radio makes sense, but does it make a difference?   Obviously it is easier to physically switch the filter in or out at the radio end, but I'm trying to understand any technical reasons behind 'proper' placement.  Granted, in true 'ham' fashion I should/will experiment myself, but I'm looking for the experience base from the experts out there.

Everyone have a great weekend.  73

Ken -- WBØOCV

--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
Optimal RF filter placement/location

Ken Sejkora
 

Hello all,

Where is the 'best' location to insert an RF filter (high-pass, low-pass, band-reject, etc.) in the transmission line to obtain optimal performance?  At the point where the coax connects to the antenna, or at the other end where the coax enters the SDR/radio? Intuitively, reducing the unwanted signal at the antenna before the coax conveys the filtered signal to the radio makes sense, but does it make a difference?   Obviously it is easier to physically switch the filter in or out at the radio end, but I'm trying to understand any technical reasons behind 'proper' placement.  Granted, in true 'ham' fashion I should/will experiment myself, but I'm looking for the experience base from the experts out there.

Everyone have a great weekend.  73

Ken -- WBØOCV

Re: Mystery mode

Nicholas Shaxted
 

You will find that type of signal quite regularly across hf up to the MUF.

It is, ahem, a spread spectrum signal and it is not OTHR, nor is it a frequency sweep for ionospheric sounding.

 

I am not sure if any amateur software wrangler has attempted to correlate these “blips”, but there might be someone.

Have you asked on Ary’s UDXF group?

 

Nick – g4ogi

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Ken Sejkora via groups.io
Sent: 08 July 2022 12:35
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Mystery mode

 

Greetings all,

I believe it's been asked before, does anyone have any idea of the short-duration blips as shown in the image below?  They span a 700 kHz range from about 14400 kHz to 15100 kHz, and appear to be spaced on discrete 'channels' anywhere from 6 to 10 kHz apart.  I assume it is some type of frequency-hopping spread spectrum mode.  Over-the-horizon radar?  Some new military/government voice mode?  I don't recall seeing it anywhere else across the  HF spectrum, but I seem to notice it here when I'm listening to 20-meter amateur band of 15 MHz WWV.  Usually observed between 1000 and 1400 UTC, but may occur at other times.

Thanks and 73
Ken -- WBØOCV
East Falmouth, MA  FN41ro
2681 - 2700 of 69511