[RTTY] Calibration Check with W1AW RTTY Bulletin

[Bob]

Probably a stupid question but I could not find the setup on
the ARRL site for RTTY.  I did find the freq of 14.095 but I
was under the impression that for Ham applications the Mark
freq was 2125 Hz with a 170 Hz shift versus 2000 Hz offset
with a 170 Hz shift.

Guess I will have to try and copy the ARRL RTTY and see.

Bob
K4QHH

--------------------------------------------------
From: "Dick Kriss" <aa5vu at arrl.net>
Sent: Tuesday, March 03, 2009 7:59 PM
To: "RTTY Reflector" <rtty at contesting.com>
Subject: [RTTY] Calibration Check with W1AW RTTY Bulletin

> I just tuned across the W1AW RTTY bulletin and decided to
> check my frequency calibration. I had solid copy with the
> Kenwood TS-570S display reading 14.096.99 with the rig
> in LSB with my RTTY software using a 2000 Hz 170 tone
> split.  My Mark-One eyeball would call that 14.095.0
> (14.096.99 ­ 2000 Hz).
>
> I got confused when I changed to the FSK mode and had
> to tune the VFO to 14.095.71 to get solid print. Per a previous
> discussion with the W1AW Station Manager I understand
> W1AW transmits RTTY in AFSK to be copied by rigs in FSK
> mode at 14.095.00.
>
> The fact that my FSK reading was off by 0.71 Hz was
> bugging me until I realized I had the CW filter activated
> and optimized to center the Mark and Space for LSB.
>
> Something tells me W1AW would have been very close to
> 14.095 in RTTY mode with with the LSB-CW filter off.
>
> Try it sometime.... better than listening to the frequency
> cops in SSB pileups.
>
>
> 73 Dick AA5VU
>
>
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