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#1
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GPS antenna conflicts?
Does anyone have experience with mounting two "mouse" GPS antennas in
close proximity of each other? Any interference issues? Specifically, I'm thinking along the lines of two Garmin 35s, or a Garmin 35 and a remote antenna for a Colibri, both within a few inches of each other under an instrument panel cover. Obviously if they are passive there shouldn't be a problem, but I see the term "active antenna" used and I'm wondering... Kirk |
#2
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#4
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Kirk,
As a data point, I am running a Cambridge 25 and a 302. The GPS receivers are apporximately 8 inches apart their remote antennas about 10 inches apart. I've seen no problems with any of my traces, nor have I lost signal long enough to generate a message on my SN10. OC |
#5
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I run a 302 and a C M20. The antennae are about 6" apart. no problem at all
-- Hartley Falbaum wrote in message ups.com... Kirk, As a data point, I am running a Cambridge 25 and a 302. The GPS receivers are apporximately 8 inches apart their remote antennas about 10 inches apart. I've seen no problems with any of my traces, nor have I lost signal long enough to generate a message on my SN10. OC |
#6
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I have had my LX20 lose all lock when I turned on a Compact Flash GPS
in an iPaq. Both GPS' failed... only came back when I uncoiled the LX20 antenna wire, I had looped it up rathe rthan shorten the leads.... never coil the wire up in a ring I learned. Bob |
#7
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I have a gps patch antenna that went faulty, it was mounted in my car.
If powered it up it killed every GPS receivers reception within about a 100m radius. Great fun on the grid at the last Open Nationals. |
#8
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Hmm, a low cost GPS jammer...very interesting!
Thanks everybody for the feedback & info; I'll have to make sure that I test my installation thoroughly before flight. Which is a good idea anyway! Kirk |
#9
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wrote in message ups.com... Does anyone have experience with mounting two "mouse" GPS antennas in close proximity of each other? Any interference issues? Specifically, I'm thinking along the lines of two Garmin 35s, or a Garmin 35 and a remote antenna for a Colibri, both within a few inches of each other under an instrument panel cover. I've had problems with two GPS receivers near each other. My problem was with a Garmin 12XL which wouldn't work on the dash of a specific car. I eventually realised that the car was fitted with it's own GPS receiver under the dash. Obviously if they are passive there shouldn't be a problem, but I see the term "active antenna" used and I'm wondering... It's not just active antennas that will influence each other. I don't know much about the technical stuff so can't offer a proper explanation, but you've only got to look at a yagi type antenna (for example a TV antenna) to see that mounting antenna near each other has an impact. Basically each element in the antenna is an antenna in it's own right which receives and re-radiates the signal. In a Yagi the purpose is to increase the directional gain, but unintentional coupling of antennas is likely to have a detrimental effect. Stephen |
#10
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After installing a microair transponder in my LS8 I recently found that
the 302 is losing the GPS signal. Both antennas were under the instrument panel about 12" apart. Since I wanted to keep the transponder antenna as far forward from my old body as possible, I moved the Cambridge antenna back (had to splice the cable, the damned thing has about a 10" length). All is well again with the GPS antenna behind my head. Slighly off topic but still interesting... Herb, J7 wrote: Does anyone have experience with mounting two "mouse" GPS antennas in close proximity of each other? Any interference issues? Specifically, I'm thinking along the lines of two Garmin 35s, or a Garmin 35 and a remote antenna for a Colibri, both within a few inches of each other under an instrument panel cover. Obviously if they are passive there shouldn't be a problem, but I see the term "active antenna" used and I'm wondering... Kirk |
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