Don knows this, so this is for those reading along.
Traditionally, a teletype Terminal Unit (TU) generates two tones: "mark"
at 2125 Hz and "space" at 2295 (170 Hz shift -- other shifts are
possible, but this is the main one).
Put a (clean) 2125 Hz tone into a SSB transmitter on Lower Sideband and
you'll get a carrier 2125 Hz below the VFO setting. To transmit "mark"
on 14.070 you'd dial the VFO to 14.072125.
The space signal would be 170 Hz lower (because LSB inverts) and "low
space means fine teletype."
For teletype, the mark and space tones are generally pretty exact, and
you're going to tune the VFO.
For PSK and the like, you'll have a waterfall display showing a number
of different QSOs, and generally speaking, you click your mouse on the
one you want. The software shifts the tone(s) as needed and the VFO
stays locked. Everyone on PSK-31 is pretty much within 2 KHz of each other.
73 -- Lynn
On 3/19/2017 1:44 PM, Don Wilhelm wrote:
Some data mode applications will do RTTY in USB by inverting the
mark/space. If using one of those, stay in DATA A submode for RTTY.
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