[RFI] Hot tub Controller Hang?

[W0MU Mike Fatchett]

Gary,

I have spent a bunch of time fixing hot tubs.  What I would try 
initially would be finding the control cable and putting a few turns 
through a ferrite core, if there is enough slack.  You might be able to 
get away with clamp ons.

If you have a remote control panel you might disconnect it as that wire 
will be fairly long or wrap that around a core as well.

I would doubt the RF is coming in on the AC lines but I suppose it could 
be.

Check the grounds or have an electrician look it over if you are 
uncomfortable.    The control wiring will probably be flat computer type 
control ribbon cable.

Good luck!

Mike W0MU

J6M CQ WW DX CW Contest 2011
J6/W0MU November 21 - December 1 2011
W0MU-1 CC Cluster w0mu.net


On 11/7/2011 8:24 PM, Gary K9GS wrote:
> OK....I'm pretty sure I've never seen this one here.
>
> I have a new HF amplifier.  I've noticed on two occasions that the
> controller on my hot tub locks up.  I don't know with 100% certainty
> that it's RF getting into the controller but this has never happened
> before.  I actually noticed it when I went to add chemicals and noticed
> the display was all messed up and the temperature was only at 97 degrees
> instead of the usual 104 degrees.  If I pull the disconnect and cycle
> the power to the tub all is fine.
>
> Any ideas for diagnosing and fixing this?  The hot tub runs off of a
> separate circuit from the amplifier, 220V at 50 amps.  Naturally I'm a
> little leery poking around in the 220V side of the controller box.
> There are no other connections to the hot tub besides the AC power.  The
> hot tub is located 150+ feet from the antenna (80-40-30M vertical).
>
>