[RTTY] N1MM and MMTTY setup

[Tad Danley]

From: Tad Danley <tdanley at verizon.net>

Alex, thank you very much for your suggestion of where to start.  I will check the audio path from the ProII to the sound card this evening.

As far as the twin peaks go on the MMTTY screen - they are there and easy to see.  In fact, when I am able to print from the ProII scope, the twin peaks are perfectly aligned with the lines in the display.  That seems to be working fine.

The XY display is another matter.  It does not appear to be a 'sharp' XY display, but since the signal level shows full scale I wasn't sure what the issue might be with it.  

The last time I was active with RTTY was 10+ years ago with my IC-765, KAM and WF1B.  Decoding was easy - when the two outside KAM LEDs were illuminated, you were tuned.  This old timer is trying to learn new tricks!

Thanks and 73,
Tad, K3TD



From: Alex Malyava <alex.k2bb at gmail.com>
Date: 2008/01/03 Thu AM 11:55:26 CST
To: Tad Danley <tdanley at verizon.net>
Cc: rtty at contesting.com
Subject: Re: [RTTY] N1MM and MMTTY setup

I think this is the place to pay attention to:

... everything seems to tune OK.  I can tune on a signal, see the signal level, waterfall and XY tuning indicator appear
to work, but I don't get a really clean XY pattern.  The signal level seems to be fine, well above the squelch setting in MMTTY and sometimes full scale....

Tad,
You suppose to see twin-peaked RTTY signal on MMTTY screen. 
Those peaks must be aligned with two white lines - more or less precisely, but AFC will help you a little bit here.
Then you should see XY pattern pretty clearly. If it not the case - you need to check the path how audio signal from your radio gets to the computer.
Is it connected to Line-In or Mic? What is the signal level? Do you have, by any chance, "digital or mic boost " turned on? try to turn it off. Any chance you get 60Hz buzz in that line? Listen to it with your headphones.

I dont know what else.

2008/1/3, Tad Danley <tdanley at verizon.net>:Tad Danley wrote:
>
> Any suggestions on things to check out?  Thanks in advance!
>

I got several offers to help with requests for more info - thank you!  I
am able to TX RTTY OK and diddle, but in RX 99% of what I print is
garbage.  I am tuning _very_ slowly and am able to get the internal RTTY
decoder in my ProII to print just fine.  I have tried selecting the
Reverse button in MMTTY but it doesn't make any difference.  Here are
some more details.

I'm using N1MM v 7.12.4.  The microKEYER is running USB router 5.1.1.  I
have used N1MM with the microKEYER for just over a year, and everything
works great for CW and SSB.  The rig and N1MM talk to each other fine
and I am able to send CW from N1MM using WinKey built in to the
microKEYER, and send wav files from the sound card is SSB.

Here are some of my RTTY settings:

ProII:
set to 9600 baud
RTTY mode
AGC Fast
RTTY filter ON
As I mentioned before, the RTTY decoder in the ProII works fine - I was
able to print the W1AW RTTY bulletin last night on the ProII scope.

USB router:
set to 9600 baud
Radio on Com 6
FSK on Com 7 with PTT box checked
Winkey on Com 8
Ausdio switching for FSK/digital set to BBB
PTT for FSK/digital set to PTT2 (rear panel jack)

N1MM:
set to 9600 baud
Radio on Com 6
Com 7 has Digital and CW/Other buttons selected with DTR = always off
and RTS = PTT
Digital Interface 1 TU type = sound card
Digital Interface 1 MMTTY has FSK selected
As I mentioned before, everything seems to tune OK.  I can tune on a
signal, see the signal level, waterfall and XY tuning indicator appear
to work, but I don't get a really clean XY pattern.  The signal level
seems to be fine, well above the squelch setting in MMTTY and sometimes
full scale.

MMTTY:
Demodulator: Discriminator set to IIR resonator, Mark = 2125 Hz, Shift =
170 Hz, BPF and AFC Connection both selected
AFC: AFC selected and Shift = Fixed
Decode: baud rate = 45.45, bit rate = 5, stop length = 1 bit for RX, 1.5
for TX, parity = none, default RX stop bit = 1 bit for RX, 1.5 for TX,
BAUDOT codeset = S-Bell
Misc: Soundcard FIFO RX = 12 and TX = 4, Priority = Higher, Device = 1,
Source = Mono, sound loopback = Int.

Thanks again for the help!

73,

--
Tad Danley, K3TD
EM10dq


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