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Author Topic: re: slow scan tv  (Read 706 times)
KC7BYP
Member

Posts: 212




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« on: May 08, 2019, 09:19:48 PM »

I screen captured both the sound and video off MMSTV prog. But I am not sure if I was tuned into HF SSTV signal. It was on about 3.600mhz. If it is a SSTV signal. Then I lost my touch when it comes to sync up the scan. It is been a long, long time since I messed with HF SSTV.  Is there a way to attach a MPG video to this post? I have never attached or dragged a video into a post before.

Steve
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Steve kc7byp
K0UA
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Posts: 4813




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« Reply #1 on: May 08, 2019, 09:30:10 PM »

I screen captured both the sound and video off MMSTV prog. But I am not sure if I was tuned into HF SSTV signal. It was on about 3.600mhz. If it is a SSTV signal. Then I lost my touch when it comes to sync up the scan. It is been a long, long time since I messed with HF SSTV.  Is there a way to attach a MPG video to this post? I have never attached or dragged a video into a post before.

Steve

It will have to hosted elsewhere. Make it a youtube video and just past the URL for it over here.
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73  James K0UA
ARRL Missouri Technical Specialist
KC7BYP
Member

Posts: 212




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« Reply #2 on: May 10, 2019, 11:50:56 PM »

It took me a while to get the video uploaded to YouTube. This is only my 2nd video that I uploaded to YouTube. Here is the link.

https://www.youtube.com/watch?v=CYZrRVzYvfo&feature=youtu.be

I screen captured both the sound and video off MMSTV prog. But I am not sure if I was tuned into HF SSTV signal. It was on about 3.600mhz. If it is a SSTV signal. Then I lost my touch when it comes to sync up the scan. It is been a long, long time since I messed with HF SSTV.  Is there a way to attach a MPG video to this post? I have never attached or dragged a video into a post before.

Steve

It will have to hosted elsewhere. Make it a youtube video and just past the URL for it over here.
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Steve kc7byp
K0UA
Member

Posts: 4813




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« Reply #3 on: May 11, 2019, 06:42:54 AM »

It didn't sound right to me.  Start by going to 14.230 USB data and try again.  It has been years since I messed with slow scan, but your signal might have been a digital voice signal.  Go to a known slow scan frequency and sit there and wait for a signal.  14.230 or 14.233.
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73  James K0UA
ARRL Missouri Technical Specialist
AE5GT
Member

Posts: 410




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« Reply #4 on: May 11, 2019, 07:58:42 AM »

I don't hear a sync . Should be a sync every 8 seconds or so. SSTV has roughly an 8 second frame rate , so you should hear it stop and sync pulse to start/stop the next frame.
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ND6M
Member

Posts: 848




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« Reply #5 on: May 11, 2019, 08:30:45 AM »

Thats not an analog or digital SSTV transmission.

It sounds like a WINLINK point to point data ( Angry) transmission. that is one of "their" frequencies.

For analog SSTV try 3.840....845. but, there isn't much SSTV on that band.

14.233 is digital SSTV and MMSSTV will not decode it. analog is usually found on 14.230 +/-

There is no audible VIS @ the beginning of the transmission you recorded.
The VIS consists of a 1200 Hz marker signal and a tone (code) to tell MMSSTV what mode is being sent and to start the Rx in the proper mode.
 on the 1200 vertical line, after the pic is synched the red triangle will turn to blue (or perhaps green, I forget).

I assume that you have gone thru the procedure to CALIBRATE your sound card offset after synching your receiver to WWV.

Good Luck




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KC7BYP
Member

Posts: 212




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« Reply #6 on: May 11, 2019, 08:42:37 AM »

I did start the recording late after the VIS and the VIS didn't sound right. That's why I am wondering if that was a SSTV TX.

Thats not an analog or digital SSTV transmission.

It sounds like a WINLINK point to point data ( Angry) transmission. that is one of "their" frequencies.

For analog SSTV try 3.840....845. but, there isn't much SSTV on that band.

14.233 is digital SSTV and MMSSTV will not decode it. analog is usually found on 14.230 +/-

There is no audible VIS @ the beginning of the transmission you recorded.
The VIS consists of a 1200 Hz marker signal and a tone (code) to tell MMSSTV what mode is being sent and to start the Rx in the proper mode.
 on the 1200 vertical line, after the pic is synched the red triangle will turn to blue (or perhaps green, I forget).

I assume that you have gone thru the procedure to CALIBRATE your sound card offset after synching your receiver to WWV.

Good Luck





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Steve kc7byp
N1ZZZ
Member

Posts: 213




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« Reply #7 on: May 13, 2019, 10:11:43 PM »

That is a VARA signal.

73
Jeremy N1ZZZ
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ND6M
Member

Posts: 848




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« Reply #8 on: May 14, 2019, 06:36:40 AM »

That is a VARA signal.

73
Jeremy N1ZZZ

Yes, it is a vara signal.
Many people that don't use Winlink have never heard of Vara and often don't recognize it when it QRMs them..

its sending e-mail for the Winlinkers.

just as was stated earlier in this thread.

https://www.winlink.org/tags/vara
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KC7BYP
Member

Posts: 212




Ignore
« Reply #9 on: May 14, 2019, 04:45:34 PM »

Well that's the 1st time I heard a VARA signal on the air. I know of Winlink but I have never used it. The remote base that I do HF on, I can only do the following digital modes on RTTY, PSK31, SSTV and a few others that I can't remember off hand, because of the 1/2 second delay on both TX and RX.
It is due to the internet control.  It takes a 1/2 second from when the receiver hears the signal before I hear it, the same for TX. For now it is better then no HF. The apt that I live in now. They won't allow any outside antennas up period. BUT I am moving at the end of May and my new landlord has given me the green light to put up antennas as long as they aren't permanent installations. I am guessing right now but I think there is enough room in the back yard for a G5RV antenna between the trees. My only problem is getting the latter line > bauln > and coax over the roof and into my bed room window. This is a 4 plex building. And I am getting a ground floor apt. The other way is to bring in the coax through the dinning room window and down the hall way to my room.  Or a long wire out my window to a tree on the front side of the building. I could use some help on that. Designing  antennas isn't my best forty, I suck at math. Please let me know if I need a new post for the antenna proj.

Steve

That is a VARA signal.

73
Jeremy N1ZZZ

Yes, it is a vara signal.
Many people that don't use Winlink have never heard of Vara and often don't recognize it when it QRMs them..

its sending e-mail for the Winlinkers.

just as was stated earlier in this thread.

https://www.winlink.org/tags/vara
Logged

Steve kc7byp
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