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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Tue Sep 01, 2009 8:26 am Post subject: VOR antennas et all |
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Cheers,
I note the level of discussion about antennas rising again, so will
make my pitch for an alternative.........
Being both, along with several others on net, I have found a strange
sameness in the two groups. Building planes and radios seem to attract
similar folk in that there's a certain camaraderie, helpfulness and
reasonableness to both groups. And, it appears that given the opportunity
each admires and is curious about the other. Even the regular meetings seem
to acquire the same atmosphere.
Given that, I have always suggested a builder of aircraft who needs
advice or measuring in the radio line contact his/her local Amateur Radio
club and solicit a dash of help in citing or measuring the antenna, both the
Av VHF, Beacon, VOR and assorted accessory freqs. It might be surprising to
find hams outbidding each other to come, see your project - pick the
gray-haired samples as they have tried it all because they are forever
trying to string up temporary, emergency and strange aerials everywhere.
Such items as airborne IRLP, APRS and other facets might come up....
Anyway, I'll go now....
Ferg
Europa Classic 914 CSprop
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jimpuglise(at)comcast.net
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| Posted: Tue Sep 01, 2009 1:18 pm Post subject: VOR antennas et all |
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Fergus-
You hit it dead on. Most amateurs are glad to help and most also have either a good VHF SWR bridge or an antenna scope. Sure beats buying one. Also, they are usually experts at soldering those pesky BNC connectors. As for the VOR antenna, I just went out to my plane and took some measurements. Since the receive antenna is horizontally polarized, it looks to me like copper tape fastened to the roof immediatly in front of, or behind, the doors would be an ideal location. As someone said, if the ends need to be bent, it is very minimal impact. You could center feed it and run the coax forward through the overhead panel or back and down a side of the fuselage. The tape is available from AS for a very reasonable price. As far as toroids go, I wouldn't bother. This orientation would put the signal you want broadside of the antenna, which is exactly what you need. The VOR antenna will be receive only, so if it is correctly tuned with a bridge, dipper, or antenna scope when installed, it will be fine. To start with, the standard formula for VHF is (5904 * K) /Frequency in MHZ. K is a variable based on the size of the conductor, for copper tape, I would use about .95. The answer is in inches. If it is receive only, I don't think it would even be necessary to tune it, the formula should be close enough. The whole thing should be about a one hour project.
Jim Puglise A-283 (K9CQ)
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gregoryf.flyboy(at)comcas
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| Posted: Wed Sep 02, 2009 8:43 am Post subject: VOR antennas et all |
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Good ideas, Ferg, am liking all of the alternatives.
But you have stimulated my right brain a bit. Why should we settle with our little 5 (or so) watt radios with only 100 mile ranges.
How could pilots from all countries communicate together? I guess we could use those ideas from the local Amateur Radio club, and put in Ham band radios into our aircraft! That will just fit the bill. I am sure they would jump at the idea of installing those radios, too.
Then all we have to do is wait for the right ionosphere conditions at the right time of the day, then we turn off a few of our accessories for the extra power, turn on the third alternator, then …. Ahh well.
Someday I guesstimate, it will be hard for me to keep running from the ham shacks.
Cheers,
Greg
_____________________________________________
Cheers,
I note the level of discussion about antennas rising again, so will make my pitch for an alternative………
…..
Given that, I have always suggested a builder of aircraft who needs advice or measuring in the radio line contact his/her local Amateur Radio club and solicit a dash of help in citing or measuring the antenna, both the Av VHF, Beacon, VOR and assorted accessory freqs.
Ferg
Europa Classic 914 CSprop [quote][b]
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