Hi,

Not sure what you have done so far as I am late on this one.

It sounds like the processor in the air con unit is being got at by 
the rf rather than a power supply issue.
What happens if you put a dummy load on the rig?  If it is a power 
supply issue then it should still play up.


On 28 Jul 2006 at 13:19, T Behler wrote:

> Hi, all.
> 
> I hate to bug everyone again about this, but I continue to have a nagging
> RFI problem in the 18-foot Fleetwood Pioneer travel trailer that my XYL and
> I recently purchased.
> 
> To review, when operating HF, I tend to cut off the air conditioner whenever
> keying up on CW.  I don't trip the GFI circuit breaker--I just cut the unit
> off, and it eventually re-sets itself and resumes normal operation within a
> few minutes.  The problem occurs mainly on 20 meters, although it does occur
> on certain frequencies in other bands as well.  I have found the problem to
> occur even when reducing my power from 100 watts, say to 50 watts.
> 
> My HF rig is an Icom 718, and my antenna is a Predator screw-driver-type
> antenna mounted on the back of the trailer.  I use a device called the
> Turbo-tuner, to be sure that the antenna is indeed resonant on my operating
> frequency.
> 
> The antenna itself is grounded to the bumper of the trailer, and I have
> installed two other grounds.  One is a ground from the 718 to the frame of
> the trailer, and the other ground is an earth ground that runs from the rig
> to a grounding stake outside of the trailer.
> 
> I am getting more and more stumped with this problem, although I have two
> additional thoughts.  Let me run them by you here;  I just don't want to
> spend more money unnecessarily on this problem:
> 
> 1.  I run the 718 with an MFJ Mighty Lite switching power supply.  I think
> it's the 4125--it has 25 amps surge, and 22 amps continuous.  Could this
> type of supply be causing the problem via some sort of stray current flow?
> Should I try an old transformer-type supply, such as an Astron RS20, to see
> if the problem disappears?
> 
> 2.  I have the rig's power supply plugged into a relatively inexpensive
> power strip, since I sometimes plug my laptop into it as well.  Is there a
> higher-quality power strip that I might want to look at?  Some have
> suggested a power strip with something called a power isolator in it, but
> I'm not quite sure what it is.
> 
> Please give me your feedback on both of these possible suggested solutions.
> Or, if you have any other suggestions, please send them to me.
> 
> Some have suggested trying to put a capacitor across the leads of the
> trailer's thermostat unit, but I really am hesitant to do that, at the risk
> of somehow voiding the warranty on the temperature control system.
> 
> Thanks for anything you can suggest.
> 
> 73 from Tom Behler:  KB8TYJ, Big Rapids, MI
> 
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> 


Keith

- - - -

Keith Barrett
email <[log in to unmask]>
Website www.barrettpianos.co.uk
Amateur radio callsign gw4nby
Corntown, South Wales