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Re: [RFI] Hot tub Controller Hang?

To: rfi@contesting.com
Subject: Re: [RFI] Hot tub Controller Hang?
From: Gary K9GS <garyk9gs@wi.rr.com>
Reply-to: garyk9gs@wi.rr.com
Date: Mon, 07 Nov 2011 22:16:44 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Thanks Mike....I don't remember there being much of a control cable but 
I have to admit that it's been a while since I've looked up inside the 
underneath of the tub enclosure.  I'll let you know what I find out.

As far as the AC side, I did have a licensed electrician wire both the 
220 circuits for the tub and the amp.  I'll check the grounds when I 
have the cover off.

On 11/7/2011 9:35 PM, W0MU Mike Fatchett wrote:
> 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).



Gary K9GS

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