What happened to the ISS SSTV audio level?
Hi folks,
Had a great pass at about Noon today, local time. Nice strong S9 signals, good audio, but my SSTV software didn't seem to want to decode it. No idea why. Trying again just now (1:36pm pass). Nice strong carrier, but the audio is almost nonexistent.
Wah happen? Anybody else experience this?
Greg KO6TH
Hi Greg!
It was a low pass here in central Arizona, maximum elevation of 5.4 degrees, and I noticed the audio sounded light. The signal strength still pegged the meter on my TH-D74, but the audio was not what I heard on the earlier pass. I will try to tweak the audio to see if I can get anything out of the picture. The first run through QSSTV on my Linux (Fedora 29) laptop showed nothing. I also have RX-SSTV on a Win10 tablet, and will try that next...
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Thu, Apr 11, 2019 at 8:47 PM Greg D via AMSAT-BB amsat-bb@amsat.org wrote:
Hi folks,
Had a great pass at about Noon today, local time. Nice strong S9 signals, good audio, but my SSTV software didn't seem to want to decode it. No idea why. Trying again just now (1:36pm pass). Nice strong carrier, but the audio is almost nonexistent.
Wah happen? Anybody else experience this?
Greg KO6TH
Monitoring the last (also low-EL) pass from central Virginia using SDR software, the issue was visually apparent.
While I don't know the underlying technical reason, there was an extremely strong central carrier right in the center of what should have been SSTV-style audio.
I could see (and hear) some of the expected SSTV audio, so it was playing. However, something else was also riding on the signal with so much power that the SSTV audio did not have a chance.
-Scott, K4KDR
===================================
-----Original Message----- From: Patrick STODDARD (WD9EWK/VA7EWK) via AMSAT-BB Sent: Thursday, April 11, 2019 4:57 PM To: AMSAT Subject: Re: [amsat-bb] What happened to the ISS SSTV audio level?
Hi Greg!
It was a low pass here in central Arizona, maximum elevation of 5.4 degrees, and I noticed the audio sounded light. The signal strength still pegged the meter on my TH-D74, but the audio was not what I heard on the earlier pass. I will try to tweak the audio to see if I can get anything out of the picture. The first run through QSSTV on my Linux (Fedora 29) laptop showed nothing. I also have RX-SSTV on a Win10 tablet, and will try that next...
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Thu, Apr 11, 2019 at 8:47 PM Greg D via AMSAT-BB amsat-bb@amsat.org wrote:
Hi folks,
Had a great pass at about Noon today, local time. Nice strong S9 signals, good audio, but my SSTV software didn't seem to want to decode it. No idea why. Trying again just now (1:36pm pass). Nice strong carrier, but the audio is almost nonexistent.
Wah happen? Anybody else experience this?
Greg KO6TH
Very low audio here on the left coast on the 13:38 local time pass. Full scale RF signal, but very low modulation.
Daron N7HQR
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Greg D via AMSAT-BB Sent: Thursday, April 11, 2019 1:47 PM To: Amsat BB Subject: [amsat-bb] What happened to the ISS SSTV audio level?
Hi folks,
Had a great pass at about Noon today, local time. Nice strong S9 signals, good audio, but my SSTV software didn't seem to want to decode it. No idea why. Trying again just now (1:36pm pass). Nice strong carrier, but the audio is almost nonexistent.
Wah happen? Anybody else experience this?
Greg KO6TH
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Hi Daron!
After editing the WAV file from my TH-D74, I was able to get some of the picture that was sent starting around 20:42:49 UTC this afternoon. That image can be seen at:
https://www.spaceflightsoftware.com/ARISS_SSTV/uploads/48604.jpg
I took the WAV file into the Audacity sound-editing program, and used the Amplify effect a few times to get the SSTV transmission to the point QSSTV could decode most of it. I have posted this picture, the original WAV file, and a few other edited WAV files in my Dropbox space at:
(look in folder "201904-ISS_SSTV")
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Thu, Apr 11, 2019 at 9:16 PM Daron Wilson via AMSAT-BB < amsat-bb@amsat.org> wrote:
Very low audio here on the left coast on the 13:38 local time pass. Full scale RF signal, but very low modulation.
Daron N7HQR
MMSSTV scales show low levels but had no problem decoding it...
a 30 degree pass this morning. https://www.spaceflightsoftware.com/ARISS_SSTV/uploads/48574.jpg Umesh, k6vug
On Thursday, April 11, 2019, 2:45:59 PM PDT, Patrick STODDARD (WD9EWK/VA7EWK) via AMSAT-BB amsat-bb@amsat.org wrote:
Hi Daron!
After editing the WAV file from my TH-D74, I was able to get some of the picture that was sent starting around 20:42:49 UTC this afternoon. That image can be seen at:
https://www.spaceflightsoftware.com/ARISS_SSTV/uploads/48604.jpg
I took the WAV file into the Audacity sound-editing program, and used the Amplify effect a few times to get the SSTV transmission to the point QSSTV could decode most of it. I have posted this picture, the original WAV file, and a few other edited WAV files in my Dropbox space at:
(look in folder "201904-ISS_SSTV")
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Thu, Apr 11, 2019 at 9:16 PM Daron Wilson via AMSAT-BB < amsat-bb@amsat.org> wrote:
Very low audio here on the left coast on the 13:38 local time pass. Full scale RF signal, but very low modulation.
Daron N7HQR
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Same here. Good, strong signals on a low pass, but QSSTV couldn't sync. Got a partial image from enhancing the recorded audio.
In the same pass they transmitted another image, but couldn't even hear and see any SSTV, only a strong carrier.
--Hans (BX2ABT)
On 04/12/2019 05:45 AM, Patrick STODDARD (WD9EWK/VA7EWK) via AMSAT-BB wrote:
Hi Daron!
After editing the WAV file from my TH-D74, I was able to get some of the picture that was sent starting around 20:42:49 UTC this afternoon. That image can be seen at:
https://www.spaceflightsoftware.com/ARISS_SSTV/uploads/48604.jpg
I took the WAV file into the Audacity sound-editing program, and used the Amplify effect a few times to get the SSTV transmission to the point QSSTV could decode most of it. I have posted this picture, the original WAV file, and a few other edited WAV files in my Dropbox space at:
(look in folder "201904-ISS_SSTV")
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Thu, Apr 11, 2019 at 9:16 PM Daron Wilson via AMSAT-BB < amsat-bb@amsat.org> wrote:
Very low audio here on the left coast on the 13:38 local time pass. Full scale RF signal, but very low modulation.
Daron N7HQR
Sent via AMSAT-BB@amsat.org. 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
Hi!
I just had a 44-degree pass over central Arizona around 0130 UTC. One of the two pictures I copied came in at the middle of the pass, yet QSSTV would not decode the WAV file from my TH-D74 HT until I amplified the recording by 20dB using Audacity. Then I saw one really good picture, and an OK second picture from the transmission just before my LOS. The audio files from this pass, including the WAV files converted to 48kbps and with the 20dB amplification, are in the "201904-ISS_SSTV" folder in my Dropbox space:
One more pass at 0300 UTC, with maximum elevation of 12 degrees. Then I'm done until tomorrow morning, if I get breaks coinciding with ISS passes...
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Fri, Apr 12, 2019 at 1:28 AM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Same here. Good, strong signals on a low pass, but QSSTV couldn't sync. Got a partial image from enhancing the recorded audio.
In the same pass they transmitted another image, but couldn't even hear and see any SSTV, only a strong carrier.
--Hans (BX2ABT)
I just had an 84 degree pass but even after enhancing the sound file no images could be decoded. What amazed me was the signal strength that I got with my Xpol 5 element beam: when the ISS came on it was full quieting. Never heard them so strong before, but then again, I never used a Xpol beam to receive the ISS.
Hope someone can contact the ISS before the weekend is over.
73 de Hans
BX2ABT
On 04/12/2019 10:11 AM, Patrick STODDARD (WD9EWK/VA7EWK) via AMSAT-BB wrote:
Hi!
I just had a 44-degree pass over central Arizona around 0130 UTC. One of the two pictures I copied came in at the middle of the pass, yet QSSTV would not decode the WAV file from my TH-D74 HT until I amplified the recording by 20dB using Audacity. Then I saw one really good picture, and an OK second picture from the transmission just before my LOS. The audio files from this pass, including the WAV files converted to 48kbps and with the 20dB amplification, are in the "201904-ISS_SSTV" folder in my Dropbox space:
One more pass at 0300 UTC, with maximum elevation of 12 degrees. Then I'm done until tomorrow morning, if I get breaks coinciding with ISS passes...
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Fri, Apr 12, 2019 at 1:28 AM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Same here. Good, strong signals on a low pass, but QSSTV couldn't sync. Got a partial image from enhancing the recorded audio.
In the same pass they transmitted another image, but couldn't even hear and see any SSTV, only a strong carrier.
--Hans (BX2ABT)
Sent via AMSAT-BB@amsat.org. 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
Lots of emails on this yesterday. There does seem to be a problem.
73, AF7ZQ
participants (7)
-
Daron Wilson -
Doug Andrews -
Greg D -
Hans BX2ABT -
k6vug＠sbcglobal.net -
Patrick STODDARD (WD9EWK/VA7EWK) -
Scott