Unusual ISS SSTV signal
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
I just heard something even weirder here during the just-completed 02:04z pass here in CM98. 3 images during the pass, the first two totally wiped out. The third started off just fine, then the interference started in.
I captured the screen and audio for the second and 3rd images here:
https://www.dropbox.com/s/jzlp9jzs4k29sy1/ISS%20SSTV%20Pass3-2020-10-06_19.0...
I'm no where near where Loren is, so it's unlikely to be local. This is with the same equipment and setup as two passes yesterday, which were totally clean. The 8pm (PDT) pass yesterday was recorded for our local club, and can be viewed here:
https://www.youtube.com/watch?v=Z_SkJ8_mtA4
Thoughts?
Greg KO6TH
Loren M. Lang via AMSAT-BB wrote:
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
A local told me the ISS repeater was on the air. Is that possible in conjunction with the SSTV?
73, Gary "Joe" kk0sd
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Greg D via AMSAT-BB Sent: Tuesday, October 6, 2020 9:38 PM To: Loren M. Lang [email protected]; AMSAT BB [email protected] Subject: Re: [amsat-bb] Unusual ISS SSTV signal
I just heard something even weirder here during the just-completed 02:04z pass here in CM98. 3 images during the pass, the first two totally wiped out. The third started off just fine, then the interference started in.
I captured the screen and audio for the second and 3rd images here:
https://www.dropbox.com/s/jzlp9jzs4k29sy1/ISS%20SSTV%20Pass3-2020-10-06_19.0...
I'm no where near where Loren is, so it's unlikely to be local. This is with the same equipment and setup as two passes yesterday, which were totally clean. The 8pm (PDT) pass yesterday was recorded for our local club, and can be viewed here:
https://www.youtube.com/watch?v=Z_SkJ8_mtA4
Thoughts?
Greg KO6TH
Loren M. Lang via AMSAT-BB wrote:
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
That was my first thought, but I'm presuming they're running from separate power sources, and using separate antennas, in different modules of the Station. If anything, the interference would be the reverse, with the SSTV desensing the x-band repeater's uplink.
Also, my audio sounds rather different from Loren's, so perhaps different (or degrading) situations?
Greg KO6TH
Gary wrote:
A local told me the ISS repeater was on the air. Is that possible in conjunction with the SSTV?
73, Gary "Joe" kk0sd
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Greg D via AMSAT-BB Sent: Tuesday, October 6, 2020 9:38 PM To: Loren M. Lang [email protected]; AMSAT BB [email protected] Subject: Re: [amsat-bb] Unusual ISS SSTV signal
I just heard something even weirder here during the just-completed 02:04z pass here in CM98. 3 images during the pass, the first two totally wiped out. The third started off just fine, then the interference started in.
I captured the screen and audio for the second and 3rd images here:
https://www.dropbox.com/s/jzlp9jzs4k29sy1/ISS%20SSTV%20Pass3-2020-10-06_19.0...
I'm no where near where Loren is, so it's unlikely to be local. This is with the same equipment and setup as two passes yesterday, which were totally clean. The 8pm (PDT) pass yesterday was recorded for our local club, and can be viewed here:
https://www.youtube.com/watch?v=Z_SkJ8_mtA4
Thoughts?
Greg KO6TH
Loren M. Lang via AMSAT-BB wrote:
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Reports suggest two SSTV transmissions at same time.
https://twitter.com/bobbylittle/status/1313665745734324225?s=19
Crossband is totally diff setup in diff ISS modules.
73, John Brier KG4AKV
On Tue, Oct 6, 2020, 23:04 Greg D via AMSAT-BB [email protected] wrote:
That was my first thought, but I'm presuming they're running from separate power sources, and using separate antennas, in different modules of the Station. If anything, the interference would be the reverse, with the SSTV desensing the x-band repeater's uplink.
Also, my audio sounds rather different from Loren's, so perhaps different (or degrading) situations?
Greg KO6TH
Gary wrote:
A local told me the ISS repeater was on the air. Is that possible in
conjunction with the SSTV?
73, Gary "Joe" kk0sd
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Greg D via
AMSAT-BB
Sent: Tuesday, October 6, 2020 9:38 PM To: Loren M. Lang [email protected]; AMSAT BB [email protected] Subject: Re: [amsat-bb] Unusual ISS SSTV signal
I just heard something even weirder here during the just-completed
02:04z pass here in CM98. 3 images during the pass, the first two totally wiped out. The third started off just fine, then the interference started in.
I captured the screen and audio for the second and 3rd images here:
https://www.dropbox.com/s/jzlp9jzs4k29sy1/ISS%20SSTV%20Pass3-2020-10-06_19.0...
I'm no where near where Loren is, so it's unlikely to be local. This is
with the same equipment and setup as two passes yesterday, which were totally clean. The 8pm (PDT) pass yesterday was recorded for our local club, and can be viewed here:
https://www.youtube.com/watch?v=Z_SkJ8_mtA4
Thoughts?
Greg KO6TH
Loren M. Lang via AMSAT-BB wrote:
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect
the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (4)
-
Gary -
Greg D -
John Brier -
Loren M. Lang