Sorry for long post, but this will be a BIG issue for me for November
SweepStakes CW.
I have a problem which is noted when my R-4C is paired with the T-4XC. I
tune in a CW station with the R-4C, switch a Sherwood 600 Hz roofing and 250
Hz filter and adjust the passband to clearly copy the station. As you know,
with the 250 Hz filter, at 700 Hz, the signal is on the skirt of the filter
and is down significantly (or even out of the passband). The frequency of
the audio of the CW signal needs to be in the 500Hz (plus / minus) range to
be able to hear the station. I also prefer a 500Hz "tone" when receiving
CW. I then "spot" the xmitter to the same frequency such that I can hear
the spot signal in the tight passband. The receiver and xmitter is on the
same frequency and the other station can hear me just fine when I transmit.
The problem arises when I use the R-4C PTO as the master oscillator
(tranceive mode). I can tune in an external carrier generated by a Kenwood
transceiver on the R-4C such that is in the passband and is solid copy. I
then use a completely different receiver (Drake R8B) to receive the same
carrier(using different antenna of course) such that it is in the R8B
passband and at the same tone (500 Hz). I use a Timewave 599ZX with center
frequency set at 500 Hz and the bandwidth knob to10 (ten) Hz for the three
conditions below. Very Narrow Audio!
If I then:
1. Turn T-4XC to spot mode (xmitter osc.), tune the mxitter VFO so the spot
signal can clearly be heard on both the R-4C and the R8B, and through the
Timewave. No Problem.
2. Transmit carrier with the T-4XC xmitter (xmitter is master ocs.), I can
clearly hear the T-4XC xmitter on both the R-4C and the R8B, and through the
Timewave. No Problem.
3. If I then turn the switch so the R-4C is the master oscillator
(transceive mode), transmit a carrier, and listen to the R8B, the signal is
no longer in the passband! Problem. I need to tune the R8B lower in
frequency by 300 Hz to hear the carrier.
The 300 Hz difference is significant and I do not get return calls when
using the C-Line in transceive mode. If I spot the T-4XC and call the
station then, I get return calls.
I checked the carrier oscillator signal from both the R-4C and T-4XC and
they are within 18 Hz of each other.
I do recall having this issue before when I first got the C-line "back in
the day" and did an adjustment to one of the rigs such that the receive and
transmit frequence were the same when using the R-4C as the master
oscillator (transceive mode), but do not recall what I adjusted.
Any and all help / comments greatly appreciated.
Jim
WA9ZBV
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