[Antennas] Through Glass Antenna

[Phil Atchley]

David,

A couple possibilities here.  When you get up into VHF/UHF "mysterious" 
things can occur in what seems like the simplest test set-up.
1.  Many through-glass antennas have a small tuning box inside the car that 
you tune for minimum SWR.
2.  Many (most?) cars that have factory tinted windows contain a metallic 
substance in the glass (or in-windshield antennas) that prevents an On-glass 
antenna from working.  My new Ford F-150 Crewcab with privacy glass falls 
into this category.
3.  It's always possible that your antenna analyzer has a problem and is 
creating some "spurs" or similar that the on-glass antenna doesn't like.


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73 de Phil,  KO6BB
DX begins at the noise floor!

THE BEACONEER'S LAIR:  http://www.geocities.com/ko6bb/
QSL GALLERY: http://photobucket.com/albums/y123/KO6BB/
Merced, Central California,    37.3N  120.48W  CM97sh

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----- Original Message ----- 
From: "David S. McCallum" <w7sac at juno.com>


> HELP>>>I have a IronHorse ATA-270 dual bander antenna mounted on the back
> window of my car and I was going to use my MFJ HF/VHF -259B Analyzer to
> check it out. With the antenna connected directly to the Anal. no matter
> where I check it on 2m or 70cm bands the swr reads 5.0 to 6.0. Put the
> Anal. on my J-Pole at the house and all was ok, normal readings on both
> bands, 1.3 + 1.5. I have a MFJ-844 inline dual band swr meter and put on
> the car and the swr reads 1.2 to 1.3 on both bands. Does any one now if
> this Analyzer will not work or give accurate readings on a through glass
> antenna?, Mac
>
> David S. McCallum/USAF RET./CMSGT/W7SAC/4