[ICOM] Fw: RE: AH-4

[John Hart]

JV,

I have been running a 706mk2g and an AH-4 auto-tuner with a 8 1/2 foot CB 
whip in my GMC Pickup truck for about three years now and it works great 80 
mtrs thru 6 mtrs.  I have the AH-4 mounted inside the cap (fiberglass) and 
the whip just outside.  The only problem I had was that I had to use 
clamp-on RF chokes on both the roll of coax feed and the control cable to 
remove the RF feedback into my trucks power system.  I rolled up the coax 
and the control cable (separately) for about 6-7 turns about 8 inches in 
diameter and placed several clamp-on chokes and the RF feedback was gone.  
My total antenna length is really about 9 1/2 feet long with the jumper 
between the output insulator and the base of the whip mount.  Good grounding 
is a must!
With the Cherokee, you might want to think of mounting the AH-4 inside a 
small steel box and anchor it to the luggage rack on the outside, the whip 
could then be mounted close.  Keep in mind what your overall height will be 
as many bridges are only 14 feet high.

Good luck,
John, K3KWO


>From: "JV" <kt4u at adelphia.net>
>Reply-To: ICOM Reflector <icom at mailman.qth.net>
>To: "Z Icom" <icom at mailman.qth.net>
>Subject: [ICOM] Fw: RE: AH-4
>Date: Sat, 16 Apr 2005 09:21:02 -0400 (Eastern Daylight Time)
>
>Good Morning
>Thought you guys may be interested in the reply that I received from
>Icom regarding my question at the bottom of the page. Are you guys
>using a weather proof enclosure?
>JV
>
>-------Original Message-------
>
>From: Amateur Tech Support
>Date: 04/13/05 10:45:26
>To: JV
>Subject: RE: AH-4
>
>Good Morning.....
>
>Thanks for your e-mail.
>
>We don't recommend mounting the tuner inside because from the tip of the
>ceramic insulator outwards is the radiating element, so your feed line
>becomes part of the antenna. What that means is that you will have
>stray RF inside of the cabin of the vehicle, and this is not good for
>the people that ride inside nor is it good for the systems of the
>vehicle. It would be better to install a longer antenna at the rear of
>the vehicle and mount the AH-4 outside in an enclosure. Hope this will 
>help.
>
>Best Regards;
>
>
>Mike Hilton
>Technical Support Representative
>
>ICOM America, Inc.
>2380 116th Ave. NE
>Bellevue, WA 98004
>Ph. (425) 454-7619
>Fax (425) 637-8417
>www.icomamerica.com
>
>-----Original Message-----
>From: JV [mailto:kt4u at adelphia.net]
>Posted At: Tuesday, April 12, 2005 6:20 AM
>Posted To: Amateur
>Conversation: AH-4
>Subject: AH-4
>Importance: High
>
>
>Good Morning
>I am thinking about purchasing the AH-4 to use with the 706 in my
>Cherokee. Since the AH-4 is advertised as being weather resistance
>instead of weather proof, I would like to mount it inside with the
>antenna staying in the center of the roof. This means that the cable
>from the antenna to the unit would have to be approximately four feet
>long. Does this propose a problem? I am planning to use a 102 inch steel
>antenna (CB). Will this be a good setup and will the antenna load ok on
>six meters? I will use a Super Hustler for eighty meters.
>Tks
>
>JV Staples KT4U
>130 Fairfax Circle
>Madison Heights, VA 24572
>----
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