Fw: [Collins] [Collins]

[Dr. Gerald N. Johnson, electrical engineer]

I don't have an official answer

There can be several possible solutions:

One is to use an antenna relay with poorer isolation (less attenuation
to the open side.

Another is to turn on the receiver BFO. zero beat the BFO to the
incoming signal, then disconnect the antenna with a second antenna relay
or by switching the main antenna relay to the transmit side without
keying the transmitter, and zero beat the transmitter with the calibrate
signal.

One might consider raising the level of the calibrate signal by adding
more stages that are turned on for calibrate.

One might turn up the drive control momentarily for the calibrate
function.

I know that changing the number of stages turned on for calibrate has
been recommended in some manual.

One might get more signal to the receiver by connecting a wire to the
receiver antenna connector through a small (a few pf) capacitor and then
run it into the transmitter near the last stage enabled when in the
calibrate mode.

73, Jerry, K0CQ, Technical Advisor to the CRA
-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.