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Author Topic: FT-1000 and RTTY mode problems  (Read 8750 times)

Posts: 398

« on: April 02, 2014, 11:56:53 AM »

In my club we have an old FT-1000 (original not D or MP) and want to try out digital modes. We bought an SB-1000 interface and hooked it up to the radio. It seems to work fine.
I am trying out JT 65 HF on 40m. I tuned in 7076 on USB and could hear the signals coming in.
But when I press the "RTTY" button (twice to get USB and RTTY on 40m) the frequency jumps about 2 kHz but the signals sound the same. I tune it back to 7076 but now the signals are way off and high pitched and JT 65 doesn't receive anything. I go back to USB voice and the frequency jumps again. I tune back to 7076 and all sounds fine and JT 65 can pick up stations. Again pressing RTTY and the frequency jumps 2 kHz and the sound is as if the frequency never changed. I have googled around to find an answer to what is going on here but to no avail.  If I then use plain USB (not RTTY) then nothing is transmitted.
Does anyone here have a clue?

Posts: 2808

« Reply #1 on: April 03, 2014, 06:21:33 AM »

"RTTY", on most rigs, gives you "true RTTY".  The rig expects an on/off (MARK / SPACE) modulating signal in that mode.  And it will offset the receive frequency so that the "dial frequency" is the same as the "emitted frequency".

. . . That is _not_ going to work for JT65-HF.

Check the manual (both the rig, and the SB-1000) for instructions on "packet" mode, or "soundcard modes", or "PSK31".  That's what you want for JT-65 HF.

.        Charles

PS -- I suggest that you get PSK31 working, before messing around with JT65-HF.  PSK31 is a really nice "conversational mode", easy to get running.   Lots of activity on 14.070 / USB.  You can get your levels set, and debug the software / interface / rig connections.   JT65-HF has some demanding timing requirements; it's not an easy place to start.

« Last Edit: April 03, 2014, 06:25:35 AM by VA7CPC » Logged

Posts: 398

« Reply #2 on: April 03, 2014, 08:29:50 AM »

Thanks for your reply.
I tried the packet button as well but it only toggles between LSB and FM....
The reason I wanted to run JT65-HF was for a demo of the mode in the club. At home my K2 runs all digi modes without a hitch.

Posts: 2808

« Reply #3 on: April 04, 2014, 12:01:35 AM »

I don't know your soundcard interface, and I don't know how it connects to the FT-1000.  It sounds like it handles both "soundcard modes" and "true FSK", so it should have connections into both the "packet side" and "RTTY side" of the rig.  But I don't know the details of how to tell both the _interface_ and the _rig_ what you want them to do.

I'll stand by my suggestion:

. . . Get PSK31 working first, and go on from there.

.           Charles

PS -- I have sometimes brought my own rig to ham club demos.  That way, I _know_ what's going on.  Usually, anyway.

PPS -- if you have digital modes working in your own shack, you have the intellectual tools you need to get them working on the FT-1000.  But you're going to have to spend some time with the manual.

Posts: 739

« Reply #4 on: April 04, 2014, 12:20:34 AM »

I do know that the FT-1000 has a setting to indicate the CW true frequency or user set offset tone. Not sure how that works on RTTY. The rig has true FSK RTTY on rear connection.

Posts: 2

« Reply #5 on: October 11, 2017, 06:24:41 AM »

Hello Michael,

Same problem here, we are trying some digital on old FT1K,

PSK31 works, JT65/FT8/AFSK-RTTY does not,

Any suggestions about what to do with radio?

Thanks in advance,

73, Vedo E72U.

Posts: 752

« Reply #6 on: October 11, 2017, 08:19:23 AM »

Maybe this will help?

Posts: 111

« Reply #7 on: October 12, 2017, 10:49:39 PM »

I don't have this radio, but Looking at the manuals online for the ft-1000 I would say the following.

The RTTY mode is only for RTTY operation, keying the frequency shift (mark and space) using the RTTY port on the back of the radio. software like MMTTY that can do FSK keying.  (I am sure there are others as well, and of course hardware TNC's can do FSK).  The mark frequency of RTTY is set at 2125 Hz audio with a 170 hz shift for the space frequency. (check your dip switches on the radio).  I If I am not mistaken, RTTY is normally a  LOWER sideband mode.  You do not need a soundcard to transmit RTTY FSK.. but you would need to send the audio output from the RTTY jack to a soundcard for it to be decoded by RTTY software.

The packet mode can be run using software like UZ7HO SoundModem.  The radio will receive the packet audio and PTT through the packet data port on the raido and this port also sends back the packet audio to your soundcard.   the LSB packet mode is most likely 300 baud for HF SSB. and the FM mode is for 1200 baud FM packet mode above 29 Mhz..   I wonder who does that.  that could be interesting.

You can sometimes find 300 baud HF packet data on 14.105 MHz lower sideband, at 1700Hz.

On the audio and FSK and PTT connections I recommend using interfaces that provide safe isolation between radio and other equipment (soundcard/pc)

All other digital modes, i think you will need to use audio input/output using MIC port on the radio, but certainly modes like  PSK, JT 65 would all be running SSB modes (upper sideband). 

good luck and 73

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