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Frank Gilliland · July 24th 06, 08:51 AM posted to rec.radio.cb

On 23 Jul 2006 23:05:19 -0700, wrote in
.com:

Hey Hey,

Just put in a Midland 1001Z, with a 5' baseloaded antenna on a magnet
mount

There's your first problem.

on my truck (2001 Nissan).

There's your second problem.

snip
If I disconnect the antenna, and connect just a wire with PL-259
connectors on both ends onto the radio, the noise exists as well, until
the connector is is tightened all the way on, then it goes away.

Don't try to figure that one out.

My radio has been wired directly onto both battery posts with lugs, and
is quite secure. I've tried putting in a noise filter inline (toroid
and capacitor) and also tried an RF choke (iron core with copper wound
around it), and nothing helped. I've tried the RF choike and noise
filter inline with the blower motor as well, and no difference.

I've tried running a ground to the magnet mount antenna base, to the
coax connector, to the radio, to no avail.

You had the right idea -- it is a grounding problem.

Ideally you should install the mounting bracket directly to the
chassis/frame/metal, but that's rarely possible with these new plastic
cars. Mount it as close and possible to the metal and run a -very-
short ground wire, no longer than just a few inches. If that doesn't
clear it up then try running a shielded power line (any old coax will
work for that). And if -that- doesn't work then think about drilling
the hole and installing a proper antenna which -will- solve the
problem.

I went to a clearing, and
adjusted my SWR when I initiallyh installed the radio, and it was
reading about 1.3 - 1.5. My car is parked about 5-10 feet from a power
line, and when I measure my SWR around there, it reads about 2-3. Not
sure if this is the power line, or if my SWR is really that bad,
haven't tested in a field again.

Unless the power line is vertical like the antenna, it probably has no
effect. Improper grounding will have strange effects like that so
don't worry about it until you get the noise problem fixed.

I'm pulling my hair out trying to figure this one out. We did cut a few
inches off the magnet mount coax, and reconnect another connector onto
the end. The closest guess I have is that maybe the shielding is wack
on the end of the cable? (Since a different cable without an antenna
doesn't exhibit the noise when it's tightened all the way on).

A few inches won't make any difference. A bad coax, OTOH, could
(repeat: -could-) make a difference. But with a poorly grounded radio
and a mag mount antenna, coax is the least of your problems.

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