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” position.

Place 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”

Place 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 tweeting.

With a 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 above.