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   Home   Help Search  
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Author Topic: SSTV  (Read 1389 times)
VE6JJO
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Posts: 26




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« on: November 27, 2008, 12:31:03 PM »

Is SSTV as simple as it appears to be?  To be honest, I hadn't even considered operating SSTV until recently, last time I saw an SSTV operation was in high school many years ago.

What I'd like to do is just have a look for a while, see whats being transmitted and see how much activity is out there.

Is receipt of an SSTV signal really as simple as downloading free software and hooking the audio from my tranceiver to the soundcard in my computer?

Thanks...
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N6NKN
Member

Posts: 425




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« Reply #1 on: November 27, 2008, 12:38:16 PM »

Yup,

And Ham Radio Deluxe does it very well.

Rick N6NKN
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KB3LIX
Member

Posts: 1130




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« Reply #2 on: November 27, 2008, 03:40:53 PM »

Yes,

MMSSTV works well too.
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KE4DRN
Member

Posts: 3734




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« Reply #3 on: November 27, 2008, 08:13:34 PM »

hi james,

years ago you needed expensive hardware to work
sstv.  soundcards and pc has changed all of that.

while you try sstv, you may also like the newer
digiatl mode PSK31.

73 james
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N5EG
Member

Posts: 258


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« Reply #4 on: November 28, 2008, 09:22:36 AM »

Hi James,

there's two types of SSTV that are common on HF: Analog, and Digital.

On 20m, analog is found on 14.230, the free program MMSSTV works great with a PC and soundcard. Analog is quick but the picture quality can suffer badly. It can be found here:

http://mmhamsoft.amateur-radio.ca/mmsstv/


On 20m, digital is found on 14.233, and the free program HAMPAL works great. With HAMPAL, you will also need RS decoder (which corrects bit errors in the files). The digital SSTV takes longer to send a picture. If you have missed part of a file, or if you got a lot of errors in the file, then the picture may not be able to be recovered. If you get all the file, then the picture quality is far far superior to analog. There are several places that HAMPAL can be downloaded from, here's one:

http://www.kiva.net/~djones/

RS decoder can be found at:

http://www.tima.com/~djones/rsdecoder.htm

RS stands for Reed-Solomon, the type of error correcting code that is commonly used for digital SSTV these days.

-- Tom, N5EG
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AB8ZL
Member

Posts: 35




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« Reply #5 on: November 29, 2008, 07:20:05 AM »

EasyPal is by far the most popular digital SSTV software anymore. It includes RS decoding so no additional software is needed. HamPal hasn’t been updated since January 1, 2006, EasyPal often has several updates a month (latest 23 November, 2008). They can send and receive from each other as they both are based off the same hamdrm.dll file.

EasyPal can be downloaded from http://www.kc1cs.com/

7.173 is a very popular frequency for this mode on 40 meters (caution, it is in the advanced/extra potion of the band) and as the post above said, 14.233 is also popular on 20 meters.
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WA3SKN
Member

Posts: 5559




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« Reply #6 on: December 01, 2008, 06:13:11 AM »

The computer, soundcards, and software have replaced the custom hardware required for many digital modes.  All that is physically needed is to get the audio levels adjusted between the radio and the soundcard (watch for ground-loops) and then software does the work!
73s.

-Mike.
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W2FEZ
Member

Posts: 2




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« Reply #7 on: October 26, 2012, 04:18:19 PM »

I use Easy Pal for digital sstv, and it works great, but you need a strong signal.
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W2FEZ
Member

Posts: 2




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« Reply #8 on: October 26, 2012, 04:22:36 PM »

Easy Pal is also a good software package for digital sstv.
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K0JEG
Member

Posts: 679




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« Reply #9 on: October 28, 2012, 08:34:02 AM »

Also available for Android phones:

http://www.wolphi.com/android-apps/droidsstv-2

I've been able to send though a 2M HT to another just by holding the phone speaker up to the HT mic. Not sure what the actual emission method would be called, since it's using an FM carrier (and definitely wouldn't be very popular over a repeater), but it works when you coordinate with the receiver.
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