[Heathkit] HW-101 T/R RELAY

[Ed - K9EW]

Hi Ron,

This rig is pretty old, and no current fold-back protection or anything
like that back then.  A fuse was your best friend.

I'm wondering if it's RF getting into the CW Tone circuit.  That Tone gets
rectified and forward-biases a tube with the relay in the plate circuit.
It's hard to trouble-shoot though because everything happens at once.  So I
have to guess at the answer, come up with a possible solution and try it
out.  Pretty much sounds like the 'Problem Solving Method', but hoping this
has happened to someone before and they could save me a lot of time.

73 and thanks for the Reply.

-ed, k9ew

On Tue, Aug 18, 2020 at 1:43 PM Ron W4BIN Youvan <ka4inm at gmail.com> wrote:

> On 8/18/2020 2:19 PM, Ed - K9EW wrote:
>
> > UPDATE:
>
> > 1)  I noticed that this problem (relay cycling on and off) doesn't seem
> to
> > happen in the TUNE mode, only in the CW mode and only when the plate
> > current gets above 150mA.
>
> > 2) It's also not consistent.  Sometimes it happens, and sometimes it
> > doesn't.
>
> > Any suggestions?
>
>    I do not  know the rig, but could it be a maladjusted form of
> protection?
>
> --
>    Ron  W4BIN - Understanding is much better than
>                                      knowing how.
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