[Hallicrafters] B&W TR Switch

[David L. Thompson]

I have a Dow Key DKC-TRP that I used with my 10 meter AM gear (HQ170 and
Elmac) as I can not stand the noise the regular dow key makes on switching.
The TR switch needs to have connections
to mute the receiver (the Dow Key does).  Otherwise you can only use it on
CW.  When you transmit the
external connection mutes the receiver just as with the normal antenna
relay.
73 Dave K4JRB

> A few years ago, I bought a B&W 381C electronic TR switch at
> Hamvention.  Still in original box, with directions, appears never to
> have been used.  I'm trying to use it between my HT-32B and SX-115, so
> maybe this isn't too far off topic.
>
> Have any of you had any experience with these?  The unit seems to work
> fine on receive, providing a little gain as expected.  On transmit,
> however, it does not sufficiently mute the antenna line to the receiver
> so I get a real blast.  I haven't tried the obvious tube checking;
> somehow I doubt that's the problem.
>
> I contacted B&W, and as expected there is no longer anyone there who
> even remembers producing these units.
>
> Thanks in advance for any possible suggestions.
>
> Parker WD8JOL