The tone recognition problem is had by many. To avoid tuning above or below
the desired tone, I use an AOR TDM-370 DSP audio filter, in stereo mode,
with a CF of 700 Hz and a band width of 100 Hz (200 Hz and 300 Hz are also
choices). When I tune a signal to the same frequency in both ears I'm
centered (within 10-20 HZ) on the other operator regardless of offset
frequency, or sideband. Otherwise the tone comes in one ear (low freq.) and
out the other (high freq.) limited in frequency range by the BW.
On a slightly different topic, not being able to properly tune in a SSB (no
carrier as reference) because the voice type and its frequency range of the
other operator is unknown, leads many operators to tune too high or too low.
I find the panadapter function in PowerSDR and my Flex-1500 operated as a
sub-receiver of my OMNI-VII, lets me zero-beat both the station I'm working,
SSB, CW, or Digital modes.
73 ES DX,
Gary -- AB9M
-----Original Message-----
From: Don Rasmussen
Sent: Thursday, August 01, 2013 11:41 AM
To: tentec@contesting.com
Subject: [TenTec] CW-N versus CW-R
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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