[Johnson] Automatic Break In TR Switch

[John W. Harden, Jr.]

Dear Viking gang,

I use an EF Johnson electronic TR Switch with a Valiant, HQ-170, and
Hammarlund HXL-ONE linear amplifier. Of course the Valiant drives the
HXL-ONE and the output goes into the TX terminal, and the HQ-170 is
connected to the RX terminal.

I also use a homebrew break-in system from QST in the late 1950's
(TATOO...Transmitter Automatic Turner Oner Offer!!).
This unit uses a 12AU7 and a mercury relay for keying, with a 10K ohm
plate circuit relay for muting the HQ-170. The system
works great...I have no TVI since everyone is on the "cable". Now, 2
meters used to kill the cable system until the fiber-optic cable was
installed by Media One (Now ATT).....

73,

John, W4NU
Atlanta
K4JAG (1959 to 1998)

radioman wrote:

> Auto breaki-in
> Just like a Porsche in a bad neighborhood.
>
> Transmits 4 kw with 2 recieving tubes and a rectifier..
> of course it is all TVI.
>
> z+ADs-)
>
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