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Re: Unusual ISS SSTV signal

Brad Smith
 

On the 18:08 pass of the ISS, no SSTV signal was heard. 

Sent from Brad's iPod

On Oct 6, 2020, at 10:51 AM, Clint Bradford via groups.io <clintbradford@...> wrote:

I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

Max White
 

If it is anything like the idiotic, mental cul de sac, G3 callsign/old duffer, who started talking to his mates on the ISS repeater downlink 'that it has now gone over and here are the times for tomorrow' - when it was still descending into the East from Zenith - nothing surprises me. Complete Moron!

73 Max/M0VNG


From: Work-Sat@groups.io <Work-Sat@groups.io> on behalf of Clint Bradford via groups.io <clintbradford@...>
Sent: 06 October 2020 16:51
To: Work-Sat@groups.io <Work-Sat@groups.io>
Subject: Re: [Work-Sat] Unusual ISS SSTV signal
 
I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

Clint Bradford
 

I would rather be positive, and NOT think it was "malicious" in nature. But it does 
seem to be "local" to you.

And as with any "jammers," just don't acknowledge them nor try to contact them 
on the air ...

Clint


Re: Unusual ISS SSTV signal

AF7ZA
 

Clint. Is it possible someone was attempting to TX interference from ground ?

On Oct 6, 2020, at 8:29 18AM, Clint Bradford via groups.io <clintbradford@...> wrote:

I have talked to others who worked your pass. I think your issue is local, and not directly related to the ISS' equipment.

Clint


Re: Unusual ISS SSTV signal

Clint Bradford
 

I have talked to others who worked your pass. I think your issue is local, and not directly related to the ISS' equipment.

Clint


Re: Unusual ISS SSTV signal

 

Yes, luckily the mysterious signal only occurred towards the beginning
of the transmission, but everywhere you see green lines around the
image is where it happened. That giant green bar was solidly the
extraneous signal.

-Loren
K7IW

On Tue, Oct 6, 2020 at 1:03 AM Clint Bradford via groups.io
<clintbradford@...> wrote:

But your image is almost perfect ... didn’t listen to audio yet ...


Re: ISS SSTV Projects

 

I'll say, my new favorite combination to just use SDRTouch on my Android phone with Robot36 decoding the audio live. I have SDRTouch saving the complete baseband signal so I can go back, correct for Doppler shift, improve filtering, fix skew, but really, with just the straight live decode and no Doppler correction, I'm quite pleased with the results. I've attached a screenshot of my Android phone setup and the image I decoded live. I used the speaker on my phone to feedback into the mic so Robot36 would be decoding during capture. I used the Arrow II Leo Satellite Yagi for my antenna with the RTL blog SDR attached to my phone with an on-the-go USB cable. Very easy and portable.

73s,
Loren
K7IW


Re: Unusual ISS SSTV signal

Clint Bradford
 

But your image is almost perfect ... didn’t listen to audio yet ...


Unusual ISS SSTV signal

 

I sent a copy of this to AMSAT BB, but was curious if anyone here
might have a clue.


During one of the SSTV transmissions today, I heard an unusual signal
overlaid on top of the regular SSTV signal. It started just after the
original SSTV signal, and was initially quite strong, but eventually
lost out to the regular SSTV signal. It sounds similar to SSTV, but
not quite the same. This started at 2020-10-06 02:54:32Z. You can hear it here:

https://www.dropbox.com/s/abcizkoly8rn1ij/funny-sstv-signal.mp3?dl=0

You can see the waterfall during the initial decode here:

https://www.dropbox.com/s/dxmy4rhruiit84v/funny-sstv-signal.png?dl=0

It does look like a separate signal on top of the original SSTV signal
and it looks more centered on 145.800 MHz than the Doppler shifted ISS
transmission which makes me thing it might be terrestrial, but I have
no idea where it would be coming from. It definitely looks like it was
targeting 145.8 and it sounds SSTV-like. The signal poped in several
more times as can be seen in this waterfall:

https://www.dropbox.com/s/gwh4h4b1d8qtnbv/funny-sstv-signal2.png?dl=0

Any ideas what this came from?

Here's the image I received during that pass:

https://www.dropbox.com/s/j11wj6yo9s2ceg9/sstv-202010060311.png?dl=0

I do have the raw baseband signal if anyone's interested.

-Loren
K7IW


Re: ISS SSTV Projects

Gordon West <swmeow@...>
 

Well - the true engineers are right!!! (G)

- Clint


GORDON WEST>> Clint, yes on Doppler corrections, when RECEIVING the SSTV. I finally found this out by listening to two SSTV signals, and found the ISS signal higher as it was heading toward us, and lower when it went away.
 
Normal!
 
My MMSSTV app did not correct for this skew on pix, and when I adjusted my TAPE (!) RECORDER speed playback, we got a nice lock, but I had to track it manually!
 
 


Re: ISS SSTV Projects

Clint Bradford
 

No “signal degradation” from ISS on SSTV images just now in So CA 2215 UTC.


Re: ISS SSTV Projects

Clint Bradford
 

Merkouris SV2HWM
 
@SV2HWM
·
 
2020-10-04 #ISS Expedition 63 – ARISS Series 16 "Satellites" #SSTV activity.

The 2 min gap between images has been reset but the modulation was significantly lower during the recent pass over Europe.


Re: ISS SSTV Projects

Clint Bradford
 

Simple FM. And since 2m - no Doppler accommodation really necessary.


https://www.work-sat.com/sstv.html


Re: ISS SSTV Projects

Randal Rutkowski
 

Just got a poor photo on a lot w pass here at CM95.



On Sep 28, 2020, at 9:27 AM, Stefan Wagener <wageners@...> wrote:


Now the $5 question:

Is it coming from the Russian module (like in the past) or is it with the new Kenwood radio from the Columbus module?

Stefan

On Mon, Sep 28, 2020 at 9:35 AM Clint Bradford via groups.io <clintbradford=mac.com@groups.io> wrote:
From RF2Space -

MAI #SSTV experiment to operate on

Sep 30 from 13:05 to 18:45 UTC and on

Oct. 1 from 12:30 to 17:45 UTC on 145.800.

Check your pass times! 

#ISSrepeater will remain active during this time on 437.800


Re: ISS SSTV Projects

David, N9KT
 

FM


On Sun, Oct 4, 2020 at 2:14 PM James Ricker via groups.io <jim7j6cef=yahoo.com@groups.io> wrote:
Are the SSTV pictures sent in FM, LSB or USB?

Thanks


Re: ISS SSTV Projects

James Ricker
 

Are the SSTV pictures sent in FM, LSB or USB?

Thanks


Re: More ISS SSTV

Clint Bradford
 

Event started early!


More ISS SSTV

Clint Bradford
 

ARISS Satellite SSTV planned for October 4-8

 

An ARISS worldwide SSTV event is scheduled from the International Space Station during the period of October 4-8. Dates and times could vary due to ISS operational changes.

 

 

Images will be downlinked at 145.8 MHz in the expected SSTV mode of operation is PD 120. The main theme of this collection of images will be Satellites. Radio enthusiasts participating in the event can post and view images on the ARISS SSTV Gallery at https://www.spaceflightsoftware.com/ARISS_SSTV/ .

 

 

 

After your image is posted at the gallery, you can acquire a special award by linking to https://ariss.pzk.org.pl/sstv/ and follow directions for submitting a digital copy of your received image.


Re: ISS SSTV Projects

Clint Bradford
 

They will! A couple passes of this last project went over the East Coast of the US. 

But keep watching for possible future projects! Get your gear ready!

Just as an FYI, here is the ham gear on board the ISS ...

​Columbus Module radios:
  • IORS - Cross band repeater activate. System supporting USOS school events.
  • Ericsson VHF-  Stowed. To be scheduled for component return and/or disposal.
  • Ericsson UHF- Stowed. To be scheduled for component return and/or disposal.
  • MarconISSta - Stowed.
Service Module radios:
  • Kenwood D700, station #1 (delivered in 2003) - Stowed.
  • Kenwood D700, station #2 (delivered in 2008) -Stowed.
  • Kenwood D710E (delivered in 2014 for MAI-SSTV) – Supporting Russian scheduled voice contacts. 


Re: ISS SSTV Projects

KC9REN
 

I would be so happy if the ISS crew would send some SSTV images over North America again. My wife Darlene KC9SBN and I enjoy receiving the images even though the neighbors are probably thinking, what are those people doing out there pointing those antennas at the sky. :) Clint Bradford, Very nice info on the URL you shared.

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