[ARC5] Spot switch for the ARC-5 transmitter

[Dennis Monticelli]

I have a spot switch that simultaneously disengages the antenna and engages
a 50 ohm dummy load (TO-220 encased R) that I mounted internally, using the
chassis as a heat sink.  It can take the power long enough to spot.  The
system works well and the receiver is not overloaded.

Note: You have to spot with full power because otherwise the pulling of the
PA will cause you to spot inaccurately.

Dennis AE6C

On Sat, Sep 26, 2020 at 6:28 PM J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:

> I was thinking about ways to to calibrate the transmitter to the receiver
> frequency without full power which overloads the receiver even with the
> antenna grounded in the antenna switch box.
>
> Has anyone tried interrupting the screen voltage wire between the
> modulator and the transmitter ?
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