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, Mon, 20 Nov 2000 16:34:27
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Your FM antenna is located on your rear windshield. It is the upper most horizontal wire on the glass. There is a distinct space between the rear defogger wires and the radio antenna wires. Take a look at it and you will quickly see what I am talking about.
Perhaps the cell antenna is covering part of the FM antenna? Changing its effective length? If that is the case, I would have the cell antenna moved down a little. If you have a choice between covering a defogger wire or a radio antenna wire, I guess it would be better to cover the defogger wire. All of the cell antennas that I have seen have an area that you can pass a defogger wire through without messing up the coupling. (They were mostly Larsen units) So hopefully that was your problem and you can just move it down a little and all will be well...
If the cell antenna is not covering the radio antenna, perhaps someone else has a suggestion as to what the problem is and how to fix it?
By the way, did you have Verizon test the capacitance of the glass? I was having severe trouble with a bunch of glass mount antennas for my 9-5. Turns out that the window was solar treated (look at the corner of the glass and you will see a picture of a sun with a big arrow that goes through a line and becomes a small arrow) and this changed the capacitance of the glass to the point that the antenna coupling was hurt. I ended up going with a simple dipole internal glassmount antenna. This negated the need to couple through the glass and gave me what I considered good performance. It was also much cheaper than the other antennas I tried. I purchased it from antennaworld.com. (I went through five before finding one I was satisfied with) I just checked the website and did not see it there anymore but you can give a call I am sure they can help you. I needed a dual band antenna, so this seemed like the best option, If you do not need dual band, there are better alternatives. (total cost incl shipping 31.59 according to my credit card statement.
If none of this helped, and nobody else gives you a decent reply, post back and I will call an old RF engineeer friend of mine at Bell Labs.
-Joe
, Mon, 20 Nov 2000 16:34:27
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