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Author Topic: FLDIGI and RTTY  (Read 13240 times)
N6SBN
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« on: July 10, 2013, 05:57:17 PM »


  I see an RTTY 45 signal.  I click on it, and it doesn't decode.   I'm in upper side band.  The FLDIGi Manual says the radio should be in USB for RTTY.  Other docs say it should be in LSB.   I'm looking for settings to get RTTY running on FLDIGI.  PS, I'm running FLDIGI on a Mac .  The rig is a KW TS-590s.  So, I'm just using the sound card.

  I tried Cocoa Modem and it was more confusing than the FLDIGI.

  Thanks in advance:   N6SBN  On the beach  Capitola CA.
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N0IU
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« Reply #1 on: July 10, 2013, 06:38:02 PM »

I have to ask...

Are you sure you are listening to a RTTY signal?

If you really want to make sure, tune into one of the ARRL RTTY bulletins. Here is a link to their schedule: http://www.arrl.org/w1aw-operating-schedule

Keep FLDIGI in USB just like you would for the other digital modes. But remember, the frequency given on the bulletin schedule is the actual frequency on which it is transmitted so when you are looking for the signal when you are in USB, you need to subtract 2.3KHz. The frequency on 40 meters is 7.095 MHz, but in USB, you would tune your radio to 7.092.7 MHz.

If you are not sure what it sounds like, here is one (of many) links to what RTTY sounds like: http://www.athensarc.org/digital-sounds.asp

Just scroll down to the RTTY (Baudot 45 170) selection and hit play.

Good luck!
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WD8OQX
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« Reply #2 on: July 10, 2013, 06:55:45 PM »

Another thing I've found out about FLDIGI, you need to be exactly on the waterfall bars or all you'll get is garbage. Try making sure that your tuning bars are on center with those in the waterfall.

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N6SBN
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« Reply #3 on: July 11, 2013, 12:45:10 AM »

  Yes is was RTTY.  The sound is exactly the same as the sample.   I viewed two distinct bars on the waterfall approx 3/4" apart.    I have Receive ID on, but the guys I was listening to were not using TX ID.   Cry       Is anyone using FLDIGI for RTTY?   In contrast, FLDIGI does a fine job on decoding Olivia, Thor, and FeldHell.

 I will check the ARRL RTTY broadcast and see if I can decode them.  
« Last Edit: July 11, 2013, 12:54:33 AM by N6SBN » Logged
N0IU
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« Reply #4 on: July 11, 2013, 03:13:21 AM »

I no longer use FLDIGI, but I still have a current copy. It is the Windows version, but I can't imagine that the MAC version would work any differently.
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NA4IT
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« Reply #5 on: July 11, 2013, 04:51:02 AM »

Instead of clicking on the signal, set your waterfall so that the low tone bar is at 2125Hz. Then use the VFO on your rig to tune to that place in the waterfall. If you are clicking high or low in the waterfall, you may be getting outside of the usable audio pass band of your rig.

I have my FLDigi bookmarks set so that when I select 14.080 USB, it defaults to the 2125Hz position.

You might also try clicking the "Rv" (reverse) button when receiving. It could be the other station is sending in reverse.
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AC4RD
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« Reply #6 on: July 11, 2013, 09:17:13 AM »

Hi, N6SBN!  I use FLDIGI for RTTY, and I have noticed that every now and then, when I first turn on the radio and laptop, I'll tune an RTTY signal and it will be garbage.  All the settings are exactly the same as they were the last time I used the radio/laptop, but my display is gibberish.  And I click the "REV" button ("reverse") and now the display is OK.

It sounds bizarre and I don't know what causes it, but I've had it happen a dozen times in the last year.  So if it looks like you SHOULD be able to read an RTTY signal but it's garbled, try clicking "reverse" (lower right of the display in my setup) and see if that fixes it.

GL 73!  -ken
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N6SBN
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« Reply #7 on: July 12, 2013, 12:04:38 AM »

Thanks for all the good info.   I will start looking for more RTTY signals to decode.    Any suggestions on bands that have a lot of RTTY activity?    Like 14.070 is to PSK?
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N0IU
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« Reply #8 on: July 12, 2013, 03:36:40 AM »

With propagation being what it is, 20 meters is going to be your best bet. But unlike PSK, there is no single spot where activity happens. When its there, the activity will most likely be from about 14.080 up to 14.100. Do as NA4IT says and park the the lower bar on 2125 and turn the AFC off then use "the big knob" to tune up and down the band so that the "railroad tracks" fall within the bars.

You don't say what kind of radio you have, but my Icom IC-7410 (as do most Icoms) has a RTTY mode where you can set the VFO to quarter turn mode. In this mode, you would have to turn the knob four times to get the same bandwidth coverage as one turn in normal mode. This gives you more control of the VFO and allows you to "fine tune" the signal.

However...

In RTTY mode it is looking for FSK input as opposed to AFSK which I am not sure if FLDIGI supports and requires a different wiring setup specifically for your radio.

That being said...

This weekend is the IARU HF Championship. It will take place on every band and is phone and CW. In a major contest like this, you can pretty much count on CW taking place from the bottom of every band right up to the bottom edge of the phone portion (and sometimes beyond). IOW, there might not be a whole lot of RTTY activity on the "regular" bands, but you can always try the WARC bands in which case 30 meters would be your best bet.
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AD9DX
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« Reply #9 on: July 12, 2013, 05:22:04 AM »

I use FLDIGI for RTTY on a PC. I have never had any issues.
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EX, KC9TRM, KB9IRZ
NR4C
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« Reply #10 on: July 23, 2013, 10:58:57 AM »

RTTY is usually LSB while most other digital modes use USB.

...bill nr4c
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N0IU
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« Reply #11 on: July 23, 2013, 03:34:13 PM »

True, RTTY is generally done on LSB on all bands, but since all the other digital modes are USB, a lot of software today that has many different digital modes (like DM780) will automatically reverse the mark and space so you can leave your radio on USB which will allow you to copy and transmit RTTY correctly.
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VA7CPC
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« Reply #12 on: July 23, 2013, 10:42:16 PM »

Quote
  And I click the "REV" button ("reverse") and now the display is OK.

+1 !!!!

If you're tuned to an RTTY signal, and the fldigi "bars" are positioned correctly, the _first_ thing to do, if you see gibberish on the screen, is to click on the "REV" button.

.                Charles

PS -- the best way to get lots of RTTY signals is to wait for an RTTY contest.  They're listed in the ARRL's "Contest Corral".

http://www.arrl.org/files/file/Contest%20Corral/2013-07.pdf

Unfortunately, there aren't any biggies in August (for HF).

.           Charles
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N0IU
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« Reply #13 on: July 24, 2013, 03:21:35 AM »

The ARRL Rooke Roundup is in August, but you don't necessarily have to wait for an ARRL contest! These are the RTTY contest through the rest of the year (plus January 1). Of course the really huge one is the CQ Worldwide DX Contest in September.

August 17-18 SARTG WW RTTY Contest http://www.hornucopia.com/contestcal/contestdetails.php?ref=87
August 18 ARRL Rookie Roundup, RTTY http://www.hornucopia.com/contestcal/contestdetails.php?ref=501
Augsut 24-25 SCC RTTY Championship http://www.hornucopia.com/contestcal/contestdetails.php?ref=99
September 6 NCCC RTTY Sprint Ladder http://www.hornucopia.com/contestcal/contestdetails.php?ref=558
September 13 NCCC RTTY Sprint Ladder http://www.hornucopia.com/contestcal/contestdetails.php?ref=558
September 20 NCCC RTTY Sprint Ladder http://www.hornucopia.com/contestcal/contestdetails.php?ref=558
September 28-29 CQ Worldwide DX Contest, RTTY http://www.hornucopia.com/contestcal/contestdetails.php?ref=130
October 11 NCCC RTTY Sprint Ladder http://www.hornucopia.com/contestcal/contestdetails.php?ref=558
October 12-13 Makrothen RTTY Contest http://www.hornucopia.com/contestcal/contestdetails.php?ref=159
October 13 North American Sprint, RTTY http://www.hornucopia.com/contestcal/contestdetails.php?ref=155
November 9-10  WAE DX Contest, RTTY http://www.hornucopia.com/contestcal/contestdetails.php?ref=183
December 7 TARA RTTY Melee http://www.hornucopia.com/contestcal/contestdetails.php?ref=195
December 8 Ten-Meter RTTY Contest http://www.hornucopia.com/contestcal/contestdetails.php?ref=538
December 21 OK DX RTTY Contest http://www.hornucopia.com/contestcal/contestdetails.php?ref=204
January 1  SARTG New Year RTTY Contest http://www.hornucopia.com/contestcal/contestdetails.php?ref=204

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N6SBN
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« Reply #14 on: July 25, 2013, 10:37:35 PM »

 For some reason, I'm able to copy RTTY and People are receiving me.  Even so, it seems more fickle than PSK or other modes.  Craig
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