[Mobile-Portable] Question about HF mobile

[Tomas Hood (NW7US)]

Hi, Brian:

On 7/12/07, Brian K. Gaskamp <ka5bkg at sbcglobal.net> wrote:

> Radio is not grounded as of yet, but working on that.

You need to insure that the antenna mount is physically grounded to
the metal of the truck.  Take a continuity tester and check between
the antenna mount ground, and, say, the frame.  But, disconnect the
coax from the radio, first as a way to isolate the antenna so that the
test is accurate.  If you have zero resistance, then there is a solid
DC ground on the antenna.  That would be a good start.  Otherwise, you
don't have enough of a ground on that part of your antenna system.

Second, you will need to ground the radio itself.  This is crucial.

Finally, I would still put on the rf choking snap-on ferrite cores on
both ends of the control head cable, and possibly also place some of
these along the antenna coax, to isolate the antenna system from the
radio.  (Common-mode).

Hope that helps...

>
> Fuses are at the battery.
>
> Brian
> KA5BKG
> ----- Original Message -----
> From: "JV" <jv at kt4u.org>
> To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
> Sent: Thursday, July 12, 2007 5:53 PM
> Subject: Re: [Mobile-Portable] Question about HF mobile
>
>
> >    Ground the antenna bracket. I think you said it was a gutter mount. If
> > so, you will have to remove paint and primer to get to the bare metal.
> > Just
> > tighten it up will not work. Is the gutter grounded to the cab? Is the cab
> > ground to the chassis? What size wire do you have going to the battery? Is
> > the radio grounded? Make sure you have a fuse in the -/+ lines at the
> > battery.
> >    I ran a 706MKIIG and Hustler antennas for over seven years. Sold the
> > 706
> > and now have a 7000 with no problems.
> > JV
> >
> > ---Original Message-------
> >
> > From: Brian K. Gaskamp
> > Date: 7/12/2007 6:10:57 PM
> > To: Mobile-Portable Reflector
> > Subject: Re: [Mobile-Portable] Question about HF mobile
> >
> > Ok guys another question about this mobile setup of mine.
> >
> > I put the 706 in low power and Swr is flat, I bump it up to medium or high
> > power and swr's go ABT 2.3:1...
> >
> > Why do they do that on high power?
> >
> > 73,
> > Brian
> > ----
> > Your Moderator: Dick Flanagan K7VC, mobile-portable-owner at mailman.qth.net
> >
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, mobile-portable-owner at mailman.qth.net
>
> --
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-- 
Tomas Hood  /  NW7US  /  Heliophile
Technical Writer / Solutions Engineer
Curriculum Vitae: http://hfradio.org/cv