[Mobile-Portable] Question about HF mobile

[D C *Mac* Macdonald]

There also may be metal reinforcing bars in the
parking lot paving that would greatly influence
the tuning of the antenna.

For many years I used the single band coils made
by Master Mobile back in the 50s and 60s.  They
were quite high Q and the antenna needed to
be resonant to work well, but then it worked
REALLY  well!!.  Master Mobile made a motor
driven series coil at the base to remotely resonate
the antenna across the band.  The Q of this setup
on 75m was so high that when tuned with carrier
for zero reflected power, SSB voice signal would
be displaced enogh that reflected power now
showed up!!!

You also might have a voltage problem if you are
running the engine in one instance but not in the
other case.

73 - Mac, K2GKK/5
Oklahoma City, OK
HF mobile since 1962



----Original Message Follows----
From: "Brian K. Gaskamp" <ka5bkg at sbcglobal.net>
Reply-To: Mobile-Portable Reflector <mobile-portable at mailman.qth.net>
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
Subject: Re: [Mobile-Portable] Question about HF mobile
Date: Tue, 10 Jul 2007 18:45:48 -0500

Philip that's exactly how I have my Hustler mobile antenna mounted.
And I am in the middle of the parking lot, there are other vehicles
close to me but nothing out of the ordinary, normal size trucks and cars.

The building is about 60-70 ft from where I park.

Now I don't have a mobile tuner...YET, but looks like I soon will, if this 
keeps up..:)

73,
Brian
----- Original Message ----- From: "Philip, KO6BB" 
<ndb_fch-344 at sbcglobal.net>
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net>
Sent: Tuesday, July 10, 2007 6:41 PM
Subject: Re: [Mobile-Portable] Question about HF mobile


>Brian,
>
>I suspect that nearby buildings or other structures may be detuning your 
>antenna.  I suggest that you park in a large open space, tune your antenna 
>for best SWR and then when you're on your lunch break recheck your SWR at 
>your operating location.  Nearby buildings, power poles, lamp poles, large 
>vehicles, anything in the near field of the antenna can detune it.
>
>I use the Hustler antennas, mounted at the top lip of my pickup bed (makes 
>for a tall antenna) and it works very well.
>
>73 de Phil,  KO6BB
>DX begins at the noise floor!
>
>Ten Meter CW Beacon KO6BB/B, 20 Watts 24/7 on 28.248MCs.
>Merced, Central California,    37.3N  120.48W  CM97sh
>
>
>----- Original Message -----
>
>>Hello all, I'm new to the list here and also new to HF mobile and I'm 
>>having a problem that has me stumped.
>>
>>I'm running a Icom 706MKII with a Hustler 40m ant on my truck.
>>
>>I can be in front of my house and I get full output on 40m and everything 
>>works great...
>>
>>I check into a 40m traffic net during my lunch break and my power out is 
>>abt 50 watts, and swr is 2.3-1...
>>
>>I just stumped and what could be happening and need some advice, 
>>suggestions, on what I'm doing wrong...
>>
>>Or better yet, what happens to my HF mobile from the time I leave my house 
>>and why it acts like it does once I get to work.
>>
>>73,
>>Brian