Electronic T/R switch

Kenneth D. Grimm, K4XL kgrimm at ADELPHIA.NET
Wed Mar 7 10:17:35 EST 2001

Sounds like an interesting project.  I used the Johnson version with a
Ranger/Thunderbolt combination for a VERY short time.  My problem was
with the noise generated by the mercury vapor rectifiers in the T-Bolt.
When the amp was off, it worked like a champ with the timed-sequence
keying in the Ranger.  I don't remember it as a dummy load for the
SX-100.  It seemed to have plenty of gain...certainly unity at least.
I'm sorry I parted with it many years ago.  After I put 3B28s in the
T-bolt, it would have probably done OK.

Ken K4XL
k4xl at arrl.net
*** BoatAnchor Manual Archive ***
On the web at http://bama.sbc.edu or
FTP site info: bama.sbc.edu login: anonymous p/w: youremailadr

> In the 1960's timeframe of the ARRL handbook was a electronic T/R
> Johnson made one for a
> while and B&W made a copy of the handbook circuit.  Many complained
that it
> was a
> TVI generator and a dummy load  for the receiver.
> I have been looking at the circuit and thinking of how to modify it to
give a
> bit more amplification for the receiver and better filtering.
> Oh yea  could even sand state it but all the boatanchors would go
belly up
> (GRIN).
> Anyone got any comments?
> Bill K0QK

More information about the Boatanchors mailing list