Ken Scharf wrote in message

The SBE-33 and 34 circuits (plus a rig from QST "transceive with
transistors")
are bidirectional, but only in one direction at a time. The direction
of operation is switched with the ptt circuit. I think he means in
both directions at the same time, as would be used in full duplex
phone circuits.

i have compeleted the bidirectional transceiver for which i was
seeking this info. it has been posted on this group and you can view
it on http://farhan.net.co.nr.
the bidirectional amplifiers do not use transformers, they are RC
coupled and they have proven to be quite stable.

- farhan