Date   

moderated Re: HF+ and UHF Satcom Pirates

Meduzi Jellyfish <iain@...>
 
Edited

Rightho. You do seem to be be getting at least or better reception from sats on your (edited: NOT) near-gainless log-periodic than I do with dedicated QFH/Crossed tor WX and several Trivec Avants for SATCOM. I suspect though that you may have an amazingly low noise floor. I was not far from you a few weeks ago (Falmouth) but forgot to take a radio (on the plus side, Mrs Meduzi-Jellyfish didn't have a reason to complain about it, so not everything was lost :)

Baz


moderated Re: HF+ and UHF Satcom Pirates

Simon Brown
 

Hi,

 

I haven’t compared them side by side, I may do that later today. Busy fixing idiotic bugs .

 

Simon Brown, G4ELI

 

www.dxgalaxy.com
www.sdr-radio.com
www.sdr-satellites.com

 

 

From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Meduzi Jellyfish
Sent: 06 November 2017 09:56
To: main@airspy.groups.io
Subject: Re: [airspy] HF+ and UHF Satcom Pirates

 

On Sun, Nov 5, 2017 at 11:26 am, Simon Brown wrote:

Nice,

Simon, is the HF+ noticeably more sensitive than R2 around 250MHz?
 


moderated Re: HF+ and UHF Satcom Pirates

Meduzi Jellyfish <iain@...>
 

On Sun, Nov 5, 2017 at 11:26 am, Simon Brown wrote:
Nice,
Simon, is the HF+ noticeably more sensitive than R2 around 250MHz?
 


moderated Re: HF+ and UHF Satcom Pirates

Meduzi Jellyfish <iain@...>
 

On Sun, Nov 5, 2017 at 04:46 pm, EB4APL wrote:

They are Brazilians, aren't they?

73 de Ignacio, EB4APL

Yes, though FLTSATCOM abuse seems fairly rife throughout South America. A fair few have had their collars felt (arrested) though they return. Their manners remind me of CB users before it was legalised as they always seemed to shout too. Two polystyrene cups and string mentality.


Re: Recommended buffer settings #spyserver

Roberto Zinelli
 

On 3G connection and NEOROUTER tunneling my config is:
 buffer-size 80 and buffer-count 40. 
 Obviously there is latency but for me is not a problem.  P.S. band is very limited in 3G so no WFM  

73 IW4ENS
Roberto

On Mon, Nov 6, 2017 at 10:35 AM, Marco Johansson <marco.johansson@...> wrote:
Hi!
 
After basic, "Out of the box" installation the buffer settings are useless, at least for my system. Lots of gaps in the stream and awfully looking waterfall. I need to change way bigger values to the configuration to get everything work smoothly (see below).
 
Is this behaviour "by the design", the internet connection is very good one: Remote (the SpyServer) site steady 50/50 mbit 4G link, receiving site 350/20mbit cable, average ping between these two is around 38ms.
 
In what kind of setup one can use the default buffer values without problems, direct LAN?

Is there something that can go badly wrong if using too high values for the buffers?

Br: Mac

# Buffer Size (in milliseconds)
#
buffer_size_ms = 100
 
# Buffer Count
#
buffer_count = 30



Re: Online - London SpyServer

Meduzi Jellyfish <iain@...>
 
Edited

On Sun, Nov 5, 2017 at 05:04 am, Stephen Rapley wrote:
A note to let you know I'm enjoying tuning about the medium wave of London on a Sunday here in Sydney. Clear audio quality at 8 bit. 
 
Cheers,
Stephen

I have quite a clean RF environment. I had a lot of PLT issues though those residents have moved on fortunately. I null temporary signal-source noise by rotating the loop and can also phase-shift local narrow-band noise, though that's only  possible for me to do, not clients, as my knobs are not internet controllable. :)


Recommended buffer settings #spyserver

Marco Johansson
 

Hi!
 
After basic, "Out of the box" installation the buffer settings are useless, at least for my system. Lots of gaps in the stream and awfully looking waterfall. I need to change way bigger values to the configuration to get everything work smoothly (see below).
 
Is this behaviour "by the design", the internet connection is very good one: Remote (the SpyServer) site steady 50/50 mbit 4G link, receiving site 350/20mbit cable, average ping between these two is around 38ms.
 
In what kind of setup one can use the default buffer values without problems, direct LAN?

Is there something that can go badly wrong if using too high values for the buffers?

Br: Mac

# Buffer Size (in milliseconds)
#
buffer_size_ms = 100
 
# Buffer Count
#
buffer_count = 30


Re: SDR Console V3

Chris van Lint
 

Hi Simon,

As always a lightning fast response.  Good to know that it at least appears to be possible.  I am 76 and I think I still have a few more on the clock, so I will be biting my nails until next year.  Certainly the multiple VFO ability is brilliant for a computer literate like myself. 

73

Chris VK4CVL

At 05:00 PM 6/11/2017, you wrote:
Chris,
 
What you want doesn’t exist but could be added next year.
 
Simon Brown, G4ELI
 
www.dxgalaxy.com
www.sdr-radio.com
www.sdr-satellites.com
 
 
From: main@airspy.groups.io [ mailto:main@airspy.groups.io] On Behalf Of Chris van Lint
Sent: 06 November 2017 05:23
To: main@airspy.groups.io
Subject: [airspy] SDR Console V3
 

I have been trying out V3 of SDR Console, because it is brilliant when multiple VFOs are required.  I decode DSB data from the Inmarsat Satellites using the C-Band AERO frequencies.  There are 2 channels using 10500 bps burst and several (up to 12) using 1200 bps burst.  To counter the frequency shift in the LNB as a result of the local 25 MHz crystal oscillator being subjected to temperature variations, I inject a DDS controlled external 25MHz signal with an accuracy of around 0.5 Hz / per 25MHz.  This is adequate for decoding the 10500 bps signals, but is not enough for the much narrower 1200 bps channels.

I use 12 VFOs with SDR Console V3 (trial).  The frequencies of the 1200bps channels are only spaced apart by about 2.5MHz.  This means that if I use a bandwidth of > 25 KHz I start intruding on adjacent channels and things get garbled.  The JAERO software will auto-tune to incoming signals, providing they are within the tuning range set by the band-width.  The decoding software cannot compensate for shifts outside this band-width  and can be as much as 4 KHz.  These shifts are not related to changes in the 25MHz clock frequency, but are the result of physical changes within the LNB, perhaps mainly the SMD components and printed inductors.  This is not a shortcoming of the LNB, which is designed for satellite TV reception - it was never intended for such small band-width signals.


My question is:

  Is there a facility within SDR Console to auto-tune and keep a centre USB frequency locked on the incoming signals of individual VFOs in the 1.44 -1.47 GHz range ?

Cheers,

Chris

Virus-free. www.avast.com


Re: SDR Console V3

Simon Brown
 

Chris,

 

What you want doesn’t exist but could be added next year.

 

Simon Brown, G4ELI

 

www.dxgalaxy.com
www.sdr-radio.com
www.sdr-satellites.com

 

 

From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Chris van Lint
Sent: 06 November 2017 05:23
To: main@airspy.groups.io
Subject: [airspy] SDR Console V3

 

I have been trying out V3 of SDR Console, because it is brilliant when multiple VFOs are required.  I decode DSB data from the Inmarsat Satellites using the C-Band AERO frequencies.  There are 2 channels using 10500 bps burst and several (up to 12) using 1200 bps burst.  To counter the frequency shift in the LNB as a result of the local 25 MHz crystal oscillator being subjected to temperature variations, I inject a DDS controlled external 25MHz signal with an accuracy of around 0.5 Hz / per 25MHz.  This is adequate for decoding the 10500 bps signals, but is not enough for the much narrower 1200 bps channels. 

I use 12 VFOs with SDR Console V3 (trial).  The frequencies of the 1200bps channels are only spaced apart by about 2.5MHz.  This means that if I use a bandwidth of > 25 KHz I start intruding on adjacent channels and things get garbled.  The JAERO software will auto-tune to incoming signals, providing they are within the tuning range set by the band-width.  The decoding software cannot compensate for shifts outside this band-width  and can be as much as 4 KHz.  These shifts are not related to changes in the 25MHz clock frequency, but are the result of physical changes within the LNB, perhaps mainly the SMD components and printed inductors.  This is not a shortcoming of the LNB, which is designed for satellite TV reception - it was never intended for such small band-width signals.


My question is:

  Is there a facility within SDR Console to auto-tune and keep a centre USB frequency locked on the incoming signals of individual VFOs in the 1.44 -1.47 GHz range ?

Cheers,

Chris


SDR Console V3

Chris van Lint
 

I have been trying out V3 of SDR Console, because it is brilliant when multiple VFOs are required.  I decode DSB data from the Inmarsat Satellites using the C-Band AERO frequencies.  There are 2 channels using 10500 bps burst and several (up to 12) using 1200 bps burst.  To counter the frequency shift in the LNB as a result of the local 25 MHz crystal oscillator being subjected to temperature variations, I inject a DDS controlled external 25MHz signal with an accuracy of around 0.5 Hz / per 25MHz.  This is adequate for decoding the 10500 bps signals, but is not enough for the much narrower 1200 bps channels. 

I use 12 VFOs with SDR Console V3 (trial).  The frequencies of the 1200bps channels are only spaced apart by about 2.5MHz.  This means that if I use a bandwidth of > 25 KHz I start intruding on adjacent channels and things get garbled.  The JAERO software will auto-tune to incoming signals, providing they are within the tuning range set by the band-width.  The decoding software cannot compensate for shifts outside this band-width  and can be as much as 4 KHz.  These shifts are not related to changes in the 25MHz clock frequency, but are the result of physical changes within the LNB, perhaps mainly the SMD components and printed inductors.  This is not a shortcoming of the LNB, which is designed for satellite TV reception - it was never intended for such small band-width signals.


My question is:

  Is there a facility within SDR Console to auto-tune and keep a centre USB frequency locked on the incoming signals of individual VFOs in the 1.44 -1.47 GHz range ?

Cheers,

Chris


Re: New RTL-SDR Spyserver

Gary
 
Edited

Give it a go......VHF-UHF......once more


Re: New RTL-SDR Spyserver

Gary
 

OK….thanks for info……spend rest of tonight updating system and try diff freqs tomorrow……..

 

Sent from Mail for Windows 10

 

From: prog
Sent: Sunday, November 5, 2017 19:37
To: main@airspy.groups.io
Subject: Re: [airspy] New RTL-SDR Spyserver

 

On Sun, Nov 5, 2017 at 05:31 pm, Gary wrote:

Maybe now.....had to change for new computer name.

Much better now, but no enough bandwidth to stream WFM. Maybe park your server in the 2m band.

 


Re: New RTL-SDR Spyserver

prog
 

On Sun, Nov 5, 2017 at 05:31 pm, Gary wrote:
Maybe now.....had to change for new computer name.
Much better now, but no enough bandwidth to stream WFM. Maybe park your server in the 2m band.


Re: New RTL-SDR Spyserver

Gary
 

Maybe now.....had to change for new computer name.


Re: New RTL-SDR Spyserver

Gary
 

Let me check….over zealous.

 

 

Sent from Mail for Windows 10

 

From: prog
Sent: Sunday, November 5, 2017 18:55
To: main@airspy.groups.io
Subject: Re: [airspy] New RTL-SDR Spyserver

 

On Sun, Nov 5, 2017 at 04:52 pm, Gary wrote:

Someone give me another try.......new more powerful computer. ;)

Unable to connect. Different routing?

 


Re: New RTL-SDR Spyserver

prog
 

On Sun, Nov 5, 2017 at 04:52 pm, Gary wrote:
Someone give me another try.......new more powerful computer. ;)
Unable to connect. Different routing?


Re: New RTL-SDR Spyserver

Gary
 

Someone give me another try.......new more powerful computer. ;)


moderated Re: HF+ and UHF Satcom Pirates

EB4APL
 

They are Brazilians, aren't they?

73 de Ignacio, EB4APL


El 05/11/2017 a las 20:26, Simon Brown escribió:

Nice,

 

More info: http://www.sdr-radio.com/Blog/PostId/17/pirates the HF+ does perform well up there.

 

Simon Brown, G4ELI

 

www.dxgalaxy.com
www.sdr-radio.com
www.sdr-satellites.com

 

 



Re: Equidistant spikes on trace on FFT - is it the server computer

John
 

Right - Thanks for all the suggestions.
Will work my way through them in due course.
Grubbing a living will intervene for a bit.
Shack on auto.
Internet uplink variable - sdr://tumbril.asuscomm.com:5555/ - limited to 4 users at time.
Antenna mast stands sentinel in the moonlight; the tide lapping its feet.
Ahhh - the romance of radio,

John


Re: Remote SDR for MW DXing

Eric Oyen <eric.oyen@...>
 

yeah, we got that. there does appear to be some sort of PLC signal on there as well. I hear the buzz rise and fall sharply on a 4 pulse per second basis. honestly, they shouldn't be using PLC signaling on these lines.

now, as for banging on poles, not possible around here as they are located in peoples back yards. There used to be alley ways here, but the city decided that it was up to residents to maintain them, so all of those alleys got fenced in and made part of everyones yards.

now, one item I can use to find powerline leakage (besides the portable radio) is a 40 Khz detector with mix down to audio frequencies. between that, the radio, my GPS on the phone, I can get a fairly accurate fix on the problem and then call the proper department inside SRP to get it fixed. one thing I know about line noise is that can travel along the lines for several miles. However, the likelihood of it being super strong at that distance is very small. the louder the signal, the closer you are to it.

anyway, I just need to acquire the ultrasonic microphone unit. I can say, it is going to look pretty damned funny for a blind guy to be walking around the neighborhood with a portable radio running, and an ultrasonic mic with headphones on. :)


last item: I use the method of the dummy load terminated connection in order to get an in-unit noise floor (which is typically about -110 Db down). all other measurements will be based on that. makes things rather simple.

DE n7zzt Eric

On Nov 5, 2017, at 11:08 AM, jdow wrote:

OK - I suspect your local power company has a department dedicated to keeping FCC complaints down. You may have to do some drilling or get help from other hams in the area who've dealt with noise. It's a little difficult for you to go out and bang on power poles you suspect with a big hammer. But, the FCC does have some regulations about this kind of noise. So finding the right power company department should result in some considerable reduction. Just be aware that switching from a dummy load to a real antenna will still provide a surprising and dismaying increase in noise. It's natural noise that can't go away.

{^_^} Joanne

On 2017-11-05 09:58, Eric Oyen wrote:
ok, here is my definition of theoretical minimum noise floor:
the noise floor that results from plugging a high quality receiver into a terminated load (a shielded 50 ohm load for unbalanced systems or a shielded resistive load of 300 ohms (or higher) for balanced systems. This way, you can sample the receiver noise and remove it's content from the resultant output.
btw, on an ordinary SW receiver (in my case, a grundig globetrotter G300), I get nothing but powerline buzz on all frequencies below 14 Mhz except during very good propagation conditions. it's a loud rasping buzz that gets stronger the lower in frequency I go. there are areas within the AM broadcast band where it is so strong that it even interferes with local very strong signals (620 KTAR is less than 4 miles from me running 50Kw during the day and that buzz even makes a hash of their signal). The buzz/hash is so intrusive that I can only hear it on all frequencies below 500 Khz.
I do not have a shielded loop here to screen out the problems. until I do, it's going to be a real trick to hear anything.
lastly, I seem to be having trouble getting the program to even acknowledge that the RTL/SDR device is plugged in. Windows 7 sees it, but SDR# says the device is either not plugged in or not installed. I may have to take the machine and the RTl/SDR devices over to a sighted ham who can help me out.
DE n7zzt Eric
On Nov 5, 2017, at 7:06 AM, jdow wrote:
Um, define what you mean by "theoretical minimum noise floor", please. The quiet areas on the Earth typically have noise levels that tend to be quite high. Atmospheric noise shows a minimum at 1.5 MHz, a peak at about 5 MHz, and drops rapidly thereafter. However, the man made noise at a quiet receiving site tends to be 45 dB to 60 dB above kTB noise at 2 MHz and 500 kHz respectively. City noise in a business area is about 45 dB higher. So you could probably gain that 45 dB back. But the rest of it is probably what anybody is stuck with at MW.

That said if you are near really high voltage power lines in a damp area the noise can, indeed, be very much higher. Even 12.6 kV has arcing problems near the ocean. In aggressively dry (most of the year) Phoenix that should not be so much a a problem. Neighbors with Plasma TVs might be worse as much power line internet tools or DSL. 70 dB above a quiet area bothers me as a concept. Antenna designs that are less susceptible to static electricity generation from breezes or winds should be explored. A good small loop antenna might worthwhile experimenting with. (And it's a shame it's socially frowned upon to use .50 caliber weapons on noisy automobiles on the roads near you.)

{^_^} Joanne

On 2017-11-04 21:44, Eric Oyen wrote:
well, depending on weather conditions, you can probably use a raspberry pie with the appropriate packages installed to act as the remote. I would recommend using ethernet cable and a 120 volt power line inside some weather shielded conduit. the enclosure can be one of several types available from Home Depot.
This setup will allow you to have the SDR right at the antenna and if the enclosure is properly shielded, you won't incur any additional noise in the antenna. you could probably get away with burying the conduit only a few inches under the turf.
I'll tell you what, I wish I had an RF quiet plot near me. I live right here in west phoenix and we have 12.6 KV overhead lines with 220 v drops to each house. HF around here is pretty noisy (at times more than 70 db above theoretical minimum noise floor. on MW, its bad and on LF (below 500 Khz, its ridiculous. what further doesn't help my situation, is the 3 grow operations located within 500 feet of me. their grow lights pretty much wipe out everything up to the 20 meter band.
anyway, I hope some of my suggestions are usable.
DE n7zzt Eric
a totally blind ham and member of the Technomage Guild
On Nov 4, 2017, at 9:12 PM, Les Rayburn wrote:
Like many DX’ers I live in a subdivision, and the noise levels make MW DXing difficult to impossible. I have a vacant plot of undeveloped wetlands adjacent to my home that is “RF Quiet” at least compared to the rest of the area. I’ve located three different receiving antennas in this area, but then have to struggle with burying coax, putting chokes on both ends, etc..etc.

Lately I’ve been wondering about the possibility of putting an SDR receiver directly at the antenna in this area-in a weatherproof enclosure, and accessing that SDR remotely.

This area is within range of my wireless N router, and it would also be possible to run ethernet cable.

Has anyone else tried something like this? Are there guides available online to help guide someone though the process?
Any help would be gratefully accepted.


73,

Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 35114
EM63nf

Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA.

Elad FDM-S2 SDR, AirSpy SDR2, SDRPlay RSP-1 Pro, Sony XDR-F1HD, Dennon TU-1500RD, Sangean HDT-1, Ray Dees RDS Decoders,
Korner 9.2 Antenna, FM-6 Antenna, Quantum Phaser, Wellbrook ALA1530 Loop, Wellbrook Flag, Clifton Labs Active Whip.

“Nothing but blues and Elvis, and somebody else’s favorite song…”



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