[RTTY] Mark & Space - High Tones

[Joe Subich, W4TV]

> On USB I believe the designations should be reversed, since 2125 Hz
> would be the LOWER RF frequency.

You are correct.  MARK is the tone that provides the *HIGHER* RF
frequency.  Thus if you use USB AFSK the conventional "High tones"
would be 2295 Hz = Mark and 2125 = Space.

Nearly all material on RTTY (and most Yaesu transceivers designed prior 
to the FT-9000/FT-2000/FT-950) assumes operation in LSB as that was the
"standard" for nearly 30 years until the "lazy programmers" showed up
with multi-mode software like HRD, fldigi, MixW, etc. that only worked
in USB.

Unlike software from the "lazy programmers," MMVARI allows selecting
*either* USB or LSB for sideband sensitive modes like RTTY, MFSK, and
QPSK.

73,

    ... Joe, W4TV


On 6/8/2011 12:58 PM, Phil Sussman wrote:
> I've been wandering on the AA5AU RTTY pages in search of
> Don's email address.
>
> After my exchange with Chen, I had a question about the
> RTTY Intro page on Don's site. It is noted that high tones
> are 2125Hz and 2295Hz (170 Hz split), Mark and Space
> respectively. While nothing is specifically mentioned at
> that point, the Mark and Space designations given are only
> applicable for LSB. On USB I believe the designations should
> be reversed, since 2125 Hz would be the LOWER RF frequency.
>
> Am I right or merely confused?
>
> Thanks ES 73,
>
> de Phil - N8PS
>
>
>
>
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