On 30/06/2017 15:25, Bill Somerville wrote:
one of us is misunderstanding the situation. There is no "split" of
the on-air signals, stations using split are transmitting exactly
where the red cursor is placed on the waterfall which is exactly the
rig's dial frequency plus the Rx DF.
Sorry, I mistyped. I meant:
"stations using split are transmitting exactly where the red cursor is
placed on the waterfall which is exactly the rig's dial frequency plus
the Tx DF."
Just to clarify further, the use of split on the rig is solely to
facilitate keeping the audio tones going into the rig above 1500Hz so
that any harmonics that are generated by overdrive or other mis-match of
audio levels will get greatly attenuated by the rig's SSB filter LP cut
off around 2700Hz.
This technique also allows an operator with a wide Rx bandwidth to
transmit anywhere in that passband.
The actuality is not bandwidth being wasted but more users per USB dial
frequency, i.e. just the opposite. Having many stations on the same dial
frequency also facilitates mass spotting to services like pskreporter
and hamspots so that openings can be quickly detected.
73
Bill
G4WJS.
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