Thanks to all for the clarification on this subject.
I see that it is true that CW-N versus CW-R would be equal if the station is
perfectly tuned in, but this rarely happens in practice.
My tone recognition is good enough not to bother with visual aids on the rig
but not always perfect.
I found this:
http://www.kb6nu.com/cw-bass-ackwards/
"If you have properly zero beat the signal of a station with which you are in
contact, then the other station’s signal will sound the same in either mode. An
interfering signal will, however, sound much differently, and, as shown, may be
out of the passband altogether.
If you don’t zero beat properly, though, being in different modes will affect
the way that the other station hears you. Say, for example, that both you and
the other station are in normal CW mode (LCW on the TenTec). The other
station’s transmit frequency is set to 7030 kHz. Your sidetone frequency is set
to 500 Hz (meaning that the BFO frequency is 500 Hz above the receive signal),
but you set your transceiver to hear a 600 Hz tone. To hear that 600 Hz tone,
you will have to set your transmit frequency to 7030.1 kHz.
If you’re in UCW mode, or CW-R mode as Icom calls it, then the BFO frequency
will be 500 Hz below the received signal, and to hear a 600 Hz tone, you’ll
have to set your transmit frequency to 7029.9 kHz. In the first case, the other
station will hear a 500 Hz tone when receiving your signal. In the second case,
he’ll hear a 700 Hz tone.
To minimize the frequency difference between the two stations, it’s a good idea
to check the setting of your sidetone frequency and zero beat as closely as
possible with the other station. I would also avoid shifting between CW modes
while in contact with another station, or if you do change modes, don’t change
your transmit frequency while in contact. Use the RIT control to change the
frequency of the tone you hear."
From: Don Rasmussen <wb8yq...>
Sent: Wednesday, July 31, 2013 10:21 AM
Subject: CW-N versus CW-R
Thanks to those who helped me align my OMNI VI+ BFO trimmers and TCXO. Without
a frequency counter I would have been SUNK even though I have been able to
perform the operation on other rigs with just an external receiver.
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