Date: Wed, 31 Oct 2018 19:41:07 +0000
From: Manfred Mornhinweg <manfred@ludens.cl>
To: amps@contesting.com
Subject: Re: [Amps] Fwd: Fwd: *** PGXL Questions on CW Operation
<A comment about this reply: This time delay implemented in SDRs will
certainly cause the station's transmission to get out without any
missing or shortened dits - but more time-delayed than the transmission
of a non-SDR. When trying to break in, your transmission will always
come late. When briefly switching to RX between dits, even if the radio
hears anything it will get through to the speaker much delayed, making
QSK less practical, or perhaps not practical at all. How is that, QSK
operators? When you listen between dits, is it OK to hear what was sent
by the other station a few dits ago, or does it have to be current?
The SDR might actually put the received signal on top of what you are
transmitting, in your headphones.
In my opinion, QSK and SDR don't go together very well. Good QSK is
easier to implement in conventional radios.
<Manfred
## Manfred, I think the idea with QSK is to get just enough of the other
fellows
transmissions, delayed or otherwise, so that you know you are ...doubling
with him.
## With plane VOX CW, and say a 300-400 msec VOX delay..and VOX CW
used at
both ends of the circuit, both ops could easily be transmitting at the same
time, and not know it.
So even if the fastest qsk setup you could achieve was a paltry 20-30
msecs, that would still
be fast enough to alleviate..doubling with the other fellow... regardless of
whether the other fellow had
qsk or not.
Jim VE7RF
txing
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