TELEDYNMCS(at)aol.com
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 Posted: Sat May 03, 2008 3:07 am Post subject: Dipole in the sternpost |
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In a message dated 5/3/2008 3:01:31 AM Eastern Daylight Time, europa-list(at)matronics.com writes:
| Quote: | | Have others had difficulity with the dipole in the rudder causing problems? |
Hi Jim,
FWIW, I installed an AAE (available from ACS) dipole COM on the rear my sternpost, forward of the rudder. I installed an AAE transponder antenna, also a dipole, on the right side of the fuselage (inside), about 12 inches in front of the rear bulkhead. Both antennae work beautifully and the only thing I notice is the card compass swings slightly when I key the transmitter. I don't see this effect when the transponder keys. I swept both these antennas individually and with their respective feed lines and the SWR characteristics are flat across their respective bands.
Do keep your coax separate from everything else. I ran my coax for the COM and transponder down one side of the fuselage and the rest of the wires down the other side. Avoid placing any other wires near the coax termination's as best you can, as RF leaks sometimes occur at the connectors and can cause problems. Use good quality coax and connectors, IOW, not Radio Shack crap. Amp makes excellent BNC connectors and they are available from Allied, Digikey and many other suppliers. I prefer solder on center pins if you can find them, with crimp on barrels. The clamp on screw type BNC connectors are garbage. Be sure the shield makes good contact with the barrel of the BNC. Spruce has very good RG58 coax that is aircraft rated. I did have to spring for a precision cable for my Garmin transponder to meet Garmin's 1dB cable insertion loss requirements, though. It wasn't cheap, but the performance I'm seeing was worth every penny.
I'd be happy to bring my sweep test gear and SWR meter to Rough River if anybody needs something looked at. I have the capacity to sweep anything from 30 Mhz to 3.3 Ghz. I also have a Bird precision watt meter for checking power output at COM and transponder frequencies.
Hope it helps!
Regards,
John Lawton
Whitwell, TN (TN89)
N245E - Currently down for cowl work
Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL Food.
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