Tom N4KG is right on with this explanation. Unfortunately it is one of
the prices you pay with most tranceivers. Some tranceivers carrier
offset will track the cw tone control (bfo) but many do not. Tom's
technique below will solve these problems. As a matter of course my
RIT is on and working continously when I am on a run frequency as many
stations are as much as 200 cps below /above my xmit frequency. Which
in most tranceivers affects the passband filtering as well. So you
must be frequecy agile in order to keep the received tone in your rx
passband and also pleasing to your ear.
/joe
----------
From: owner-cq-contest@contesting.com
To: CQ-CONTEST@CONTESTING.COM; DX@VE7TCP.AMPR.ORG
Subject: [CQ-Contest] ANOTHER CAUSE OF UNINTENDED DUPES
<snip>
To determine your radio's offset, place the radio in TRANSMIT
while in the CW mode. Set the VFO to read XX00.0. Switch
back to receive mode. Turn on the calibrate signal
(if you have one, otherwise, use WWV). If the received pitch
is NOT at your desired listening pitch, adjust the RIT or PITCH
control to bring the received signal to your preferred pitch.
Now your transmit frequency will be zero beat with the
received signal. DO NOT tune the VFO during this adjustment.
<snip>
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