 Using your rear window defroster as an antenna, Who has done this? Fess up. Please. |
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| balljoint |
 Feb 13 2006, 12:23 PM
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914 Wizard  Group: Members Posts: 10,001 Joined: 6-April 04 Member No.: 1,897 Region Association: None  |
I am researching hidden antenna options for the 914 stereo and a number of times in searches I have found reference to a person or people here who have used their rear window defroster as a stereo antenna.
What I haven't been able to find out is who did it, and how well it actually works. Anybody want to fess up? I know some modern cars have antennae built into windows in this way, but I don't know if they are using the same grid or a separate wire. Although I suppose that heating up your stereo antenna with an electrical current might cause some radio interference.... (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) |
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| TonyAKAVW |
Feb 14 2006, 03:56 PM
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That's my ride. Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None |
My guess is that nearly all automotive radio antennas are some form of quarter wave ground plane vertical. The car makes a great ground 'plane' and they appear to be roughly 30 inches in length. A spiral is likely just a way to shorten the length by packing it in a tighter space. It sorta works.
I actually doubt that many automotive FM radio antennas are active. Active antennas are mostly reserved to high frequency (> 1 GHz) where the loss of the coaxial cable to the receiver has an impact on noise figure. GPS antennas and Xm radio antennas are active because of this. FM radio is at ~100 MHz where a few feet of coax doesn't make much difference. -Tony |
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Posts in this topic
balljoint Using your rear window defroster as an antenna Feb 13 2006, 12:23 PM
michel richard Dave,
I have'nt done it, but it would be kinda... Feb 13 2006, 12:31 PM Aaron Cox i think it was bleyseng that did that.... Feb 13 2006, 01:51 PM Aaron Cox Feb 14 2006, 03:10 PM carambola the spiral is wrapped around the antenna to reduce... Feb 14 2006, 04:44 PM kwales I worked on a hidden antenna in a semi once.
Suc... Feb 14 2006, 08:30 PM jsteele22 Antennas are strange beasts. I once bought a set ... Feb 15 2006, 11:25 AM
TonyAKAVW Actually, putting a ~10000 pF, >15V capacitor in s... Feb 15 2006, 11:54 AM |
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