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.
k4xl at arrl.net
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> 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
> 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
> bit more amplification for the receiver and better filtering.
> Oh yea could even sand state it but all the boatanchors would go
> Anyone got any comments?
> Bill K0QK
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