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Car radio whip antenna question
DEFCON 88 wrote:
OK, this deviates somewhat from the topic, but I've always wondered about window antennas. My Mitsubishi Galant has an antenna embedded in the rear window. It's not one of those dipoles that you used to (or still?) see embedded in the front windshield of GM cars. Rather, it has a peculiar folded design that's hard to describe. It works very well. I get exceptional reception, especially on AM. In fact, one of the reasons I chose the Galant is because it had the best AM reception of all the cars I test drove. What's the theory on these window antennas? Do they have a pre-amp ahead of the radio? Mine are crossed active loops at MF frequencies. Folded dipole at FM freqs. |
#2
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Car radio whip antenna question
"dave" wrote in message . .. DEFCON 88 wrote: OK, this deviates somewhat from the topic, but I've always wondered about window antennas. My Mitsubishi Galant has an antenna embedded in the rear window. It's not one of those dipoles that you used to (or still?) see embedded in the front windshield of GM cars. Rather, it has a peculiar folded design that's hard to describe. It works very well. I get exceptional reception, especially on AM. In fact, one of the reasons I chose the Galant is because it had the best AM reception of all the cars I test drove. What's the theory on these window antennas? Do they have a pre-amp ahead of the radio? Mine are crossed active loops at MF frequencies. Folded dipole at FM freqs. The old window antennas weren't dipoles at all. Both "elements" were connected to the center of the lead-in. The only reason for the dipole appearance was symmetry, which helped to make them less of a distraction to the driver. |
#3
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Car radio whip antenna question
On Jun 12, 2:55*pm, "Brenda Ann"
wrote: "dave" wrote in message . .. DEFCON 88 wrote: OK, this deviates somewhat from the topic, but I've always wondered about window antennas. My Mitsubishi Galant has an antenna embedded in the rear window. It's not one of those dipoles that you used to (or still?) see embedded in the front windshield of GM cars. Rather, it has a peculiar folded design that's hard to describe. It works very well. I get exceptional reception, especially on AM. In fact, one of the reasons I chose the Galant is because it had the best AM reception of all the cars I test drove. What's the theory on these window antennas? Do they have a pre-amp ahead of the radio? Mine are crossed active loops at MF frequencies. *Folded dipole at FM freqs. The old window antennas weren't dipoles at all. Both "elements" were connected to the center of the lead-in. The only reason for the dipole appearance was symmetry, which helped to make them less of a distraction to the driver. The embedded Wire Windshield Antennas used two very thin parallel wires and the two created a larger signal capture area plus the two provided some redundancy if one should break. The newer Printed-On Window Wire Antennas {Circuit Trace (Wire) on Glass} have a great sectional width {less likely to break} and go around and/or across the Window. At least that is how the one we have in the rear side window of the Ford Windstar Van is laid-out it come in {starts} from a single contact point and goes almost all the way around the rear-side Window with a 1/2" gap between the far-ends; plus there is an extra leg starting in one corner of the Window that goes across the Window at a Diagonal Angle; and yet another extra leg starting at the opposite corner of the Window that goes across the Window at a Horizontal Angle. * Sort of a bent & folded Window Windom Antenni FWIW the Ford Windstar Van's Rear-Side Window Antenna seams to work very well down in the SF Bay Area but poorly up here in the mountains : While the Solid Metal Whips and the Wire Wrapped Whip Antennas seam to do as well in the SFBA and much better up here in the Sierras. This may be due to the fact that the Whips actually project out away from the Body {counterpoise} of the Car and are physically by-design a better EMF "Probe" then the Foil-on-a-Window Antennas. and that's how i hear it on the radio ~ RHF |
#4
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Car radio whip antenna question
Brenda Ann wrote:
wrote in message . .. DEFCON 88 wrote: OK, this deviates somewhat from the topic, but I've always wondered about window antennas. My Mitsubishi Galant has an antenna embedded in the rear window. It's not one of those dipoles that you used to (or still?) see embedded in the front windshield of GM cars. Rather, it has a peculiar folded design that's hard to describe. It works very well. I get exceptional reception, especially on AM. In fact, one of the reasons I chose the Galant is because it had the best AM reception of all the cars I test drove. What's the theory on these window antennas? Do they have a pre-amp ahead of the radio? Mine are crossed active loops at MF frequencies. Folded dipole at FM freqs. The old window antennas weren't dipoles at all. Both "elements" were connected to the center of the lead-in. The only reason for the dipole appearance was symmetry, which helped to make them less of a distraction to the driver. Some were top loaded short vertcals as you describe, but not all. |
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