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Re: Mystery mode
jdow
Roughly speaking where are you located? Are there military or protest sites anywhere near you? That definitely looks like some form of covert comm. {^_^} On 20220709 08:05:18, Ken Sejkora
wrote:
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Re: Mystery mode
jdow
Receive them on post processing. But, then you would have to
figure out how to demodulate and decrypt them. If they don't all
more or less start and end at the same time you may have multiple
hopping and likely encrypted nets operating. {o.o} On 20220709 04:43:12, Kriss Kliegle
KA1GJU wrote:
I've seen them too from southeast NH. The 'pips' are too random for QRM, I was thinking spread spectrum comms myself. |
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Re: Optimal RF filter placement/location
jdow
Small quibble - an all metal adapter is OK. Avoid adapter cables, though. And a ferrite bead good for the pertinent frequencies on the antenna cable at the input of the filter won't hurt and may help considerably depending on your exact situation. {^_^} On 20220709 04:32:17, James Redding
WA9VEZ via groups.io wrote:
Only one place to avoid signal leakage that junk connectors, cheap coax (bad shielding), poor connections (twisted wires), bi-metallic junctions (ersatze diodes), cause. The filter needs to be on the input connector of the SDR without any adapters. |
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Re: SDRC and Airspy R2
jdow
On 20220709 03:46:01, David J Taylor
via groups.io wrote:
On 08/07/2022 22:00, George Stein - NJ3H via groups.io wrote:
And select the packing option. That reduces the load on USB by about 1/3. {^_^} |
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Re: Ettus USRP N200 compatibility
#sdrconsolev3
#ettus
Any progress on this?
On Thu, 30 Jun 2022 10:27:39 +0000, "Simon Brown" <simon@...> wrote: Hi, |
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Re: SDRC and Airspy R2
Conrad, PA5Y
According to the user manual with the preamp and noise reduction on the MDS at 91.1MHz is -138dBm in 500Hz, which equates to -165dBm/Hz. This is a 9dB noise figure and is probably 3-6dB worse because the NR makes things appear better than they are. If you add 2.5dB to that noise figure you can see that an LNA will be of great benefit.
I suggest that a system noise figure of around 2-3dB is optimum for Band II DXing.
Regards
Conrad PA5Y
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
Hi,
What's the S3 noise figure on Band II ? I have maybe 2dB loss in the 25m RG6, so am wondering what the total NF is.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Conrad, PA5Y via groups.io <g0ruz@...>
BTW I put the BPF before the LNA to help protect it from 144MHz EME high power. I am not suggesting that a PGA103+ will saturate from normal Band II situations. However, it has a little bit too much gain, so a good filter and an attenuator does no harm. The S3 really is excellent. Just like you said 😊
73
Conrad PA5Y
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Conrad, PA5Y via groups.io
Hello Simon, I have done a noise analysis and you WILL benefit from an LNA. I have a PGA103+ preceded by a band pass filter and it seems to work very well. However, I am still waiting for a bigger antenna. I ordered an OPTDES which never arrived. So, I will ask a few of the local Band II DXers for an alternative.
73
Conrad PA5Y
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
FWIW,
The ELAD S3 is the best Band II receiver I have. Am thinking about a preamp on the mast for those very weak stations - if I get close to receiving weak signals from across the pond (USA, Canada).
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <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 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.
- + - + - 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. |
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Re: SDRC and Airspy R2
Hi,
What's the S3 noise figure on Band II ? I have maybe 2dB loss in the 25m RG6, so am wondering what the total NF is.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Conrad, PA5Y via groups.io <g0ruz@...>
Sent: 09 July 2022 16:06 To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> Subject: Re: [SDR-Radio] SDRC and Airspy R2 BTW I put the BPF before the LNA to help protect it from 144MHz EME high power. I am not suggesting that a PGA103+ will saturate from normal Band II situations. However, it has a little bit too much gain, so a good filter and an attenuator does no harm. The S3 really is excellent. Just like you said 😊
73
Conrad PA5Y
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Conrad, PA5Y via groups.io
Hello Simon, I have done a noise analysis and you WILL benefit from an LNA. I have a PGA103+ preceded by a band pass filter and it seems to work very well. However, I am still waiting for a bigger antenna. I ordered an OPTDES which never arrived. So, I will ask a few of the local Band II DXers for an alternative.
73
Conrad PA5Y
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
FWIW,
The ELAD S3 is the best Band II receiver I have. Am thinking about a preamp on the mast for those very weak stations - if I get close to receiving weak signals from across the pond (USA, Canada).
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <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 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.
- + - + - 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.
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Re: SDRC and Airspy R2
Conrad, PA5Y
BTW I put the BPF before the LNA to help protect it from 144MHz EME high power. I am not suggesting that a PGA103+ will saturate from normal Band II situations. However, it has a little bit too much gain, so a good filter and an attenuator does no harm. The S3 really is excellent. Just like you said 😊
73
Conrad PA5Y
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Conrad, PA5Y via groups.io
Hello Simon, I have done a noise analysis and you WILL benefit from an LNA. I have a PGA103+ preceded by a band pass filter and it seems to work very well. However, I am still waiting for a bigger antenna. I ordered an OPTDES which never arrived. So, I will ask a few of the local Band II DXers for an alternative.
73
Conrad PA5Y
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
FWIW,
The ELAD S3 is the best Band II receiver I have. Am thinking about a preamp on the mast for those very weak stations - if I get close to receiving weak signals from across the pond (USA, Canada).
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <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 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.
- + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Re: Mystery mode
Ken Sejkora
Thank you, Gary. The signal is not there all the time; it was there yesterday, Fri:08-Jul around 11:30 UTC, but wasn’t there several times when I checked this morning, Sat:09-Jul. As stated in my original post, I usually notice it when I tune into WWV at 15 MHz, or when I’m listening to the upper part of the 20-meter band and see the blips in the waterfall above 14.5 MHz. Given the frequency, I don’t believe it to be local to New England (Kriss up in NH often sees it as well), and is likely propagation from somewhere more distant, although CHU on 14670 kHz was coming in when I took the screenshot yesterday. Next time I notice it, I’ll check what regions are ‘skipping’ in on 20-meters, and also check WWV and other commercial stations to get a sense of propagation while I’m seeing the mystery signal.
If it is some type of frequency-hopping communication mode, I’m impressed that it is spanning a frequency range of about 700 kHz. That’s pretty big at HF frequencies, but maybe not so up in the VHF and UHF bands.
By the way, my monitoring here is with SDR Console, Airspy HF+ Discovery, fed from a random longwire coupled through a 9:1 unun.
Thanks again. Have a great weekend.
Ken
From: GARY W RUSSELL
Sent: Saturday, July 9, 2022 09:46 AM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Mystery mode
After enlarging the screen shot I see what you are talking about. I’ve actually been monitoring 14 MHz lately and have never noticed that phenomenon before here in Central, IL. I am using SDR Console, Airspy HF+Discovery and a Wellbrook Loop antenna. I will watch for it though,
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Re: SDRC and Airspy R2
Conrad, PA5Y
Hello Simon, I have done a noise analysis and you WILL benefit from an LNA. I have a PGA103+ preceded by a band pass filter and it seems to work very well. However, I am still waiting for a bigger antenna. I ordered an OPTDES which never arrived. So, I will ask a few of the local Band II DXers for an alternative.
73
Conrad PA5Y
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
FWIW,
The ELAD S3 is the best Band II receiver I have. Am thinking about a preamp on the mast for those very weak stations - if I get close to receiving weak signals from across the pond (USA, Canada).
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of George Stein - NJ3H via groups.io <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 20220708 14:47:30, George Stein - NJ3H via groups.io wrote:
92 watts not 25.
- + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Re: Bye-Bye 4m, Hello Band II
Curt Faulk
I pay for an annual Microsoft 365 Family subscription ($70 US annually). With it, you get 5TB of OneDrive storage albeit spread across 5 different OneDrive accounts of 1 TB each. I think it is well worth it.
From my recent renewal notice: Your 1 year subscription to Microsoft 365 Family has been renewed. Your subscription was successfully renewed on Monday, July 04, 2022. On your next renewal date, Tuesday, July 04, 2023, USD 69.99 plus applicable taxes will be charged. |
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Re: Off-topic from SDRC
Curt Faulk
George, couldn't you just set up a server using SDR# Spyserver or the excellent SDR Console Server? It seems to me that would be the best option and it's not difficult to do. Kriss, KA1GJU, has written some excellent documentation on how to do it in SDR Console. I'm sure you can find his setup guide by searching this list. It seems to me that a server is the way to go and would be far preferable to a remote desktop session unless you're just planning to listen using your smartphone. |
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Re: Mystery mode
GARY W RUSSELL
After enlarging the screen shot I see what you are talking about. I’ve actually been monitoring 14 MHz lately and have never noticed that phenomenon before here in Central, IL. I am using SDR Console, Airspy HF+Discovery and a Wellbrook Loop antenna. I will watch for it though,
Gary |
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Re: Mystery mode
Ken Sejkora
I agree with Kriss. I’m not sure if ‘random’ is the proper term to use regarding the ‘pips’, but the fact that they are very short-duration intermittent and jump around between discrete frequencies suggests to me that they are not interference. My experience with ‘interference’ lines is that they tend to be either constant or perhaps periodic at some repetitive sequence. Perhaps I’ll try recording the ‘pips’ in CW mode on one given frequency and try to analyze the duration and see if there is any identifiable modulation in the short period.
Thanks to everyone that has offered their suggestions. Have a great weekend. 73
Ken -- WBØOCV
From: Kriss Kliegle KA1GJU
Sent: Saturday, July 9, 2022 07:43 AM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Mystery mode
I've seen them too from southeast NH. The 'pips' are too random for QRM, I was thinking spread spectrum comms myself.
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Re: Mystery mode
I've seen them too from southeast NH. The 'pips' are too random for QRM, I was thinking spread spectrum comms myself.
It's hard to actually listen to them, due to not appearing on the same frequency over short periods of time. 73 Kriss KA1GJU |
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Re: Mystery mode
David L. Wilson
I should add that the specks that were being asked about look like interference to me.
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Re: Optimal RF filter placement/location
Only one place to avoid signal leakage that junk connectors, cheap coax (bad shielding), poor connections (twisted wires), bi-metallic junctions (ersatze diodes), cause. The filter needs to be on the input connector of the SDR without any adapters.
Would also suggest that the filter needs to have a zero pole at DC so that any static charge can't get into the SDR front end and do damage. The DC shunt is to avoid the chance that a static charge caused by wind driven "dust" doesn't punch thru input capacitors and reach semiconductors. Momentarily shorting the input connector to discharge any accumulated charge also applies to VNA's. -- WA9VEZ / Jim
N 39.1766 W 86.2693
Ham since 1962 /Radio fanatic since 1952 |
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Re: Mystery mode
David L. Wilson
I am puzzle by the waterfall display on SIGIDWIKI although the audio file there is SUPERDARN. I have visited 2 sites here in Virginia. See attached write-up from my visits.
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Re: SDRC and Airspy R2
FWIW,
The ELAD S3 is the best Band II receiver I have. Am thinking about a preamp on the mast for those very weak stations - if I get close to receiving weak signals from across the pond (USA, Canada).
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.
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Re: Mystery mode
Ken Sejkora
Thanks Gary. I wasn’t referring to the ‘wavy’ signal in the middle of the spectrum from 14750 to 14800 kHz, but rather the “speckling” that occurs throughout the entire spectrum which are very short in duration and occur on multiple discrete frequencies as indicated with the short-duration blips in vertical columns spread 6 to 10 kHz apart.
I was aware of the Signal Identification Wiki, and have had it bookmarked for several years now. Thanks for sharing it with the rest fo the group.
Ken -- WBØOCV
From: GARY W RUSSELL
Sent: Friday, July 8, 2022 03:14 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Mystery mode
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:
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