KR> Antenna length (2nd try)
Guysmy 2 cents. http://www.piteraq.dk/flight/jodelantenne.html Daniel Nieto -Mensaje original- De: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] En nombre de Glenn Martin Enviado el: Viernes, 04 de Noviembre de 2011 11:29 p.m. Para: KRnet Asunto: KR> Antenna length (2nd try) On 11/4/2011 6:23 PM, Larry&Sallie Flesner wrote: > I have an antenna as seen onhttp://www.advancedaircraft.com/ ( the > 5I or 5T. The antenna is a bit pricey, ( I got mine for free many years > ago) but you could probably build one for less than $20. The AAE VHF-5T antenna is a folded dipole (as you recall, I recommended that type in an earlier post). This will be pre- tuned, and although it will have some minor detuning introduced by ANY installation, that is not a major issue, making this probably the BEST antenna to be used in the KR. It has lower received noise than the standard antennas used. Best installation: Place 1/2 of it up inside the tail and the other half secured safely down below the tail inside the empennage. Keep the antenna as straight as you can when installing it in your plane, and as close to straight up and down as the plane permits. Bends in the antenna will adversely effect it's impedance and radiation pattern. This will also give the antenna the proper polarization (comm antennas should be vertical polarized) Building the same antenna from scratch is easy, getting the original 300 ohm impedance to reduce to 50 ohms is not. The MATCHED and TUNED antenna is what costs you the 150 or so bucks. WELL WORTH THE COST if your not an radio guy. SEE?? All that damned schooling DID pay off!!! -- Glenn Martin, KR2 N1333A, Biloxi, MS ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Antenna length (2nd try)
On 11/4/2011 6:23 PM, Larry&Sallie Flesner wrote: > I have an antenna as seen onhttp://www.advancedaircraft.com/ ( the > 5I or 5T. The antenna is a bit pricey, ( I got mine for free many years > ago) but you could probably build one for less than $20. The AAE VHF-5T antenna is a folded dipole (as you recall, I recommended that type in an earlier post). This will be pre- tuned, and although it will have some minor detuning introduced by ANY installation, that is not a major issue, making this probably the BEST antenna to be used in the KR. It has lower received noise than the standard antennas used. Best installation: Place 1/2 of it up inside the tail and the other half secured safely down below the tail inside the empennage. Keep the antenna as straight as you can when installing it in your plane, and as close to straight up and down as the plane permits. Bends in the antenna will adversely effect it's impedance and radiation pattern. This will also give the antenna the proper polarization (comm antennas should be vertical polarized) Building the same antenna from scratch is easy, getting the original 300 ohm impedance to reduce to 50 ohms is not. The MATCHED and TUNED antenna is what costs you the 150 or so bucks. WELL WORTH THE COST if your not an radio guy. SEE?? All that damned schooling DID pay off!!! -- Glenn Martin, KR2 N1333A, Biloxi, MS
KR> antenna length
On 11/4/2011 8:38 AM, Pete Klapp wrote: > Mark / Netters > I'm just getting back to this antenna thing. > Any assistance greatly appreciated. > > > The length of the coaxial cable should not make any difference so long as the antenna is adjusted properly. I have a recommendation for everyone. Many Amateur Radio operators have a 'MFJ VHF antenna analyzer" (or some such antenna analyzer, grid dip meter, swr meter,etc) and would likely be happy to assist you in getting your antenna length cut for the proper length. Call your local Amateur Radio Club, explain that you are trying to get your aircraft VHF comm antenna adjusted properly and see if there is someone with an analyzer who would be willing to help. That really is the easiest way to be certain: use a pro. Hand the guy 50 or so bucks for his trouble. I'm already doing that on a Wag Aero Sport Trainer at the local airport. -- Glenn Martin, KR2 N1333A, Biloxi, MS
KR> antenna length
Mark / Netters I'm just getting back to this antenna thing. I was out west in Montana for several weeks. I've read Glenn Martin's explanation for the 20.3" antenna length that you used. I have no knowledge on this subject, so I'll just follow these recommendations. I do have another question. Did you cut the coax to a multiple of the wavelength? 20.3" times "X" prior to terminating the coax with a BNC connector at the comm radio? Any assistance greatly appreciated. Pete Klapp, building KR-2S N729PK, Canton, OH
