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DIGITAL SSTV tips & questions

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  #1  
Old 01-06-2009, 07:11 AM
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Default DIGITAL SSTV tips & questions


there seems to be some interest in digital sstv. EASYPAL software seems to be the most commonly used.
there is very little (ie: none) written instructions for the program. but there are some "beta testers" that are very familiar with it and give help if needed .

first of all EASYPAL is not really an SSTV program, yes it "does" sstv, but that isn't what it really is. it really is a "file transfer program". it doesn't really care what type of file either. it can transfer any type file (including COM/ EXE, extensions) so JPG, JPEG, or any other picture extensions will work.

basic info:

you must be running at least XP (or higher) and the faster the cpu, the better.

download EASYPAL from Welcome To KC1CS Home Page and install the software

basic set up:
click setup and on the popup menu:

enter callsign

select ptt: rts/dtr or cat (most of you will use rts/dtr) for TX put a "dot" in the rts on dtr on circle and for RX put a dot in the rts dtr(off always) circle and then enter the comm port number

rx input, select either line in or mike and adjust sliders to about halfway (these can be fine tuned later)

there are many other options on the setup menu, but , unless you already understand them, just leave them alone and use the program DEFAULTS for now.

this should get the software up and talking to your computer.


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Old 01-06-2009, 07:28 AM
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what is a "BSR"?

with analog sstv sometimes the signal faded during a transmission and you only got some of the picture. with EASYPAL that doesn't happen. you either get it all or you get nothing. in fact, you get the actual digital file exactly as it was on the digital camera, this is why the pictures look so good.

EASYPAL has a feature that is similar to the FEC feature of packet. if (say) a picture is 300 sections and you get 275 sections, rather than having the sending station resend all 300 sections, you can tell it to ONLY resend the 25 sections you didn't get (saving time and bandwidth). this is called a BSR (bad section repair).

if you don't get all the image, then click on the BSR icon on the main screen , and a second screen will popup with the callsign and the name/number of the sent pic. click "send selected request" and your rig will automaticlly xmit and ask for only the bad sections to be resent.

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Old 01-06-2009, 07:44 AM
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what is RS1, RS2, RS3, RS4?
the software can be adjusted to compensate for good or bad propagation. it will add some redundency(RS) in the xmitted image depending on the value after the RS

above the waterfall display there is a box (next to RS). put a check mark in the box by LEFT clicking on it. (this tells the software to encode a redundancy factor during the xmission)

on the number to the right of RS, RIGHT click on the number and it will cycle from 1 to 4, i usually use RS2 or RS3, it depends on the band conditions. lower number are for good conditions (less redundency and shorter xmit time) and higher numbers for poorer propagation (more rendudency and longer xmit time).

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Old 01-06-2009, 07:59 AM
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general use:

on the main screen there is a red verticle bar from the bottom up it reads:
IO
TIME
FRAME
FAC
MSC
i won't go into what they all mean for now, but, they will all start out red (except for I/O) and as the signal is received they will change to green. ALL must be green or you will not process any received information and you will get a "failed to decode" warning.

the sound card INPUT should be adjusted so that the "RX slider bar" (above the SNR icon) should start out a dark green, then as the signal is recieved, the slider should change to a bright green. adjust the sound card input so that the bright green bar stays in the LOWER third of the box or the sound card will be overdriven.

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Old 01-07-2009, 03:47 AM
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thanks for this "hookedon"
im planning on giving this a shot soon

need to repair my interface first

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Old 01-07-2009, 04:18 AM
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some other software that i think is really great. all 4 of these programs will run from within EASYPAL and can be launched via the EASYPAL "action" menu or they can be run as a "stand alone" program.

go to sstvPics by W3WVG

dick has written SSTV PICS, EASYLOG, EASYCALLS, and DIGISITES.

the EASYCALLS mapping is awesome, do a call sign search and then go to the "street level" view. WOW!

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Old 01-08-2009, 09:39 AM
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Hookedn6,

This is great stuff. I downloaded this software last week but haven't had a chance to play with it yet. You probably just saved me a few hours of research. I can't wait to try this.

Are there some common frequencies where people hang out that use this, or is 14.300 still the "default"?

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  #8  
Old 01-08-2009, 10:10 AM
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Mole I believe the freq mostly used are
14.233 USB and 7.173
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