R4, R4A, &
R4B Series Receiver & T4X Transceive Adjustment
The following procedure applies to either
the R4, R4A or R4B receivers.
This procedure will correct for the
transmitter not transmitting on the receiver frequency. This is often
mentioned in a QSO as not being on the other stations frequency. Or not
being zero beat with the other station.
Turn the T4X and R4 on and let it warm up
for at least 60 minutes to assure stability.
Place the R4 mode switch in the “SSB”
the R4 Function switch in the “ON” position. In this position, the
receiver will not be muted when transmitting and you will be able to
hear the transmit signal.
Turn the T4X “SIDEBAND” switch to “LOWER”
the T4X “TRANCEIVE” switch to the “RCVR” position. In this position, you
are receiving on the receivers VFO
Press the PTT switch and you should hear
your transmitted signal. With no modulation, it will sound like a bird
small bladed screw driver, adjust the C61 while listing to the tweet.
Adjust the tweet in the direction that
slows the tweeting down.
Adjust C61 until the tweet sound stops, or
gets very slow. This is zero beat.
As an alternative, you can speak into the
mic while adjusting C61. Adjust until your signal sounds the best. This
method is more difficult, than adjusting for the zero beat referenced