Colin and all:

The problem happens with both CW and SSB, but I haven't tried AM or FM yet.
I run the IC718 with  an MFJ 4125 Mighty Lite switching power supply.  The
supply provides 22 amps  continuous, and 25 amps surge if I remember
correctly.

Maybe this info will be helpful.

As for toroid coils, can someone tell me where to get them, and how they
typically would connect to the power cord of something like the trailer air
conditioner unit?  Also, what is the cost?  Do you need different kinds of
coils, depending on the frequency on which your operating?

Pardon the questions here:  This aspect of things is new to me, so I'm in
learning mode again.

Best 73 from Tom Behler: KB8TYJ



  ----- Original Message ----- 
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, June 01, 2006 11:14 PM
Subject: Re: rfi question


> pounding an earth stake a few feet long and grounding it to the frame of
the
> trailler would certainly help.
> However, as for your air conditioner...a few things, are you running the
718
> on its own ac to dc power supply? or are you running batteries in the
> trailer?
> I am thinking of a current/voltage issue...perhaps when you key up, the
air
> conditioning unit isn't getting enough juice to stay on, and thus goes
> off...whilst everything else, which draws much less current is able to
stay
> on.
> Does it happen on AM? FM? or just SSB and CW...and, does it happen when
you
> just key the mike on ssb or only when you modulate?
> You might have to put a toroid coil or filter on the power leads of the
air
> conditioner to prevent this from happening if its an RF problem.
> 73
> Colin, V A6BKX
> ----- Original Message ----- 
> From: "T Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, June 01, 2006 8:09 PM
> Subject: rfi question
>
>
> > Hi, all.
> >
> > As many of you know, I have been working with a Predator
screwdriver-type
> HF
> > antenna on the back of an 18-foot camping travel trailer.
> >
> > Last week-end, I had the chance to test out the antenna extensively, and
> my
> > results were surprisingly good on 75, 40, and 20 meters.  I use the
> antenna
> > with a 102-inch whip, and tune it with an old SWR meter and a Conway
> tuning
> > aid.
> >
> > I do have one problem, though.
> >
> > It seems that every time I keyed the rig on 20 meters, either in SSB or
> CW,
> > I would kick the trailer's air conditioner off.  Nothing else seemed to
be
> > affected--just the air conditioner.  After the air conditioner tripped
> off,
> > it would re-start itself again, but then get kicked off when i keyed up
> > again on 20.
> >
> > Obviously, there is some RF getting in somewhere and doing the tripping.
> >
> > I have the Predator antenna grounded to the frame of the trailer, and
the
> > IC718 HF rig grounded to the frame also.  Obviously, that's not
> sufficient.
> >
> > Should I install an earth ground?  Would that help?
> >
> > Does anyone have any other simple suggestions or explanations for this
> > oddity?
> >
> > Thanks much, and best 73 from Tom Behler: kB8TYJ
> >
> >
>