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Author Topic: Digital 101  (Read 4171 times)
KR4VT
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Posts: 52




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« on: June 20, 2011, 07:54:01 PM »


I'm new to digital modes, I've looked around bit using DM780 and caught some PSK31 QSO's but there are a lot of signal streams that do not do anything. My guess is that they are a different mode. How can I tell what mode a certain signal is?
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KX5JT
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Posts: 217




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« Reply #1 on: June 21, 2011, 06:06:55 AM »

Enable RSID which stands for Reed Soloman Identification.

Find it in the Program Options and read about it here:

http://forums.ham-radio.ch/showthread.php?16550-How-to-use-RSID
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AB2RC
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Posts: 127


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« Reply #2 on: June 21, 2011, 09:07:06 AM »

Enable RSID which stands for Reed Soloman Identification.

Find it in the Program Options and read about it here:

http://forums.ham-radio.ch/showthread.php?16550-How-to-use-RSID

Great idea, but it only works if the transmitting station is sending a txid.

This http://www.w1hkj.com/FldigiHelp-3.20/Modes/index.htm  page has examples of the sounds & waterfall traces that can be decoded by fldigi.


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KR4VT
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Posts: 52




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« Reply #3 on: June 21, 2011, 05:01:59 PM »

Thanks guys, great info
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KX5JT
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Posts: 217




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« Reply #4 on: June 22, 2011, 04:22:28 AM »

Enable RSID which stands for Reed Soloman Identification.

Find it in the Program Options and read about it here:

http://forums.ham-radio.ch/showthread.php?16550-How-to-use-RSID

Great idea, but it only works if the transmitting station is sending a txid.


So spread the word and turn it on when calling cq in modes other than the obvious ones!  Smiley
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K2NCC
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« Reply #5 on: June 23, 2011, 01:49:44 PM »

This might help:  http://www.youtube.com/k2ncc

Has dozens of modes and programs to help ID.  Video and sound, most in HQ/HD.

Also, if you can snag a screen-shot or audio sample, someone somewhere will help ID it for you.
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Vy 73, de Frank K2NCC
KB6HOH
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Posts: 189




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« Reply #6 on: June 24, 2011, 12:47:16 AM »

Robert (Bob)

          Just about a complete listing of the different Modes and what they Look and Sound like can be found on the W1HKJ.com Website for FLdigi. On the leftside of the page you will see "Sights and Sounds of Digital Signals".
The RSID (Reed Solomon Identification) is the best thing since sliced Bread.
Not all Programs support it. Currently only 3 support it. HRD/DM780, FLdigi and MultiPSK.

                       73 de Steve KB6HOH
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AD6KA
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Posts: 2238




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« Reply #7 on: June 24, 2011, 12:59:00 PM »

RSID is a wonderful thing, no doubt.

But I keep wondering.  When I first started running
RTTY & AMTOR in the mid-late 80's with a Commodore 64
and PC Packratt, (and monitoring HF WEFAX, etc) there was a
program mode (UNID? SIGID?) that would identify the type of signal, (and baud rate
if it was ASCII), baud & shift if it were RTTY, and a % mode type probability rate.
Usually the more you listened & better you tuned, the higher the % probability
rating went up. It was really cool! Then it would
give a "Decode? Y/N" prompt. All DOS of course, on an monochrome monitor. Grin
Commercial RTTY uses a different shift and rate, which it
too would ID and copy, without having to scroll through rates/shifts.

Now of course I realize that digimodes have come a loooong
way
and are far, far more complicated now. Well, so have computers, processing
speed, AD/DA converters and software! Seems like it wouldn't be much of a stretch to
write a program that would do the same with a "point & Click" on the waterfall.

Or wouldn't the market support such a program?
Seems like the SWL UTE guys would love it.
Maybe there alreay is one, I dunno....

Just thinking out loud.
73, Ken   AD6KA
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KR4VT
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Posts: 52




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« Reply #8 on: June 24, 2011, 01:57:59 PM »

It appears RSID is turned on but I'm not seeing any type of ID on the screen.
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KX5JT
Member

Posts: 217




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« Reply #9 on: June 24, 2011, 09:13:59 PM »

This might help:  http://www.youtube.com/k2ncc

Has dozens of modes and programs to help ID.  Video and sound, most in HQ/HD.

Also, if you can snag a screen-shot or audio sample, someone somewhere will help ID it for you.

Nice Frank.  I love your youtube channel... very informative.  Thanks!

john
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WB8ROL
Member

Posts: 19




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« Reply #10 on: June 28, 2011, 09:35:21 PM »


I'm new to digital modes, I've looked around bit using DM780 and caught some PSK31 QSO's but there are a lot of signal streams that do not do anything. My guess is that they are a different mode. How can I tell what mode a certain signal is?

There are many digital modes in use on the ham bands.  The ones I hear most are PSK31 (and other variations like PSK63 and PSK125), RTTY, Olivia, JT65A, Domino, FeldHell, ALE400, Throb, and MFSK.

While it is worth turning on the RSID RX function in DM780 (and other programs) it is ALSO worth the effort to check out the other modes by doing an internet search for the modes above (and others) and reading some about them.  Many sites ALSO have sound files you can play AND graphics showing what they look like in the waterfall.

An excellent resource is at the FLDigi web site page : http://www.w1hkj.com/FldigiHelp-3.20/Modes/index.htm

While RSID is really cool it REALLY helps to have an idea what the more used digi modes look and sound like

---Gary WB8ROL
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