So, the new Elecraft K3 is improving this situation. In the DATA mode, the
K3 can transmit either AFSK or FSK, and the display shows the Mark frequency
in both cases. Of course, one could run AFSK in LSB (or, USB) mode on the
K3 and have a display frequency different than the Mark frequency.
73,
Ed - W0YK
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Jack West XP
> Sent: Friday, 31 August, 2007 14:30
> To: RTTY GROUP
> Subject: [RTTY] Spotting RTTY frequencies...
>
> Hi All,
>
> Most of you probably know what I am about to say, but many
> ops new to RTTY do not. All radios in ham radio are not equal.
>
> It is possible to have three different radios, all
> transmitting on exactly the same frequency, and all three
> radios have different frequency displays.
>
> !. Old Kenwoods such as my TS-940 display the Space frequency vice the
> Mark frequency. Thus when operating in FSK on 3.580 MHz, I have to
> subtract the Shift (in hertz) from 3.580 and set the
> frequency display to:
> 3.579.83 to xmit exatly on the 3.580 Mhz mark frequency.
> This is condition 1.
>
> 2. Most new radios, when operating in FSK display the Mark
> frequency correctly
> as 3.580.00 such as the Icom 756 Pro III.
>
> 3. Other radios when operting in AFSK on 3.580 (and LSB) will
> add the mark
> frequency low tone (2125 hz) and display 3.582.125 Mhz.
>
> All three of the above radios are transmitting RTTY Mark at
> exactly the same frequency of 3.580.00 but the frequency
> displays to the operators are all different.
>
> I have been NCS of the West Coast Ratts Net since 1988 and it
> is always fun to get new comers to understand how to get on
> the intended frequency.
>
> My two cents..
> 73
> de Jack / W7LD / "Lucky Dog"
> NNNN
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