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#21
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Transponder antenna - blade vs stub monopole
At 1,000 MHz, RG-58 has a loss of about 15 db per 100 feet. So, a 10 foot
run would represent 1.5 db. That is an acceptable loss. It will reduce the range a bit. Generally, if the control cables are not resonant and not in the same plane as the antenna (horixontal controls, vertical antenna), there should be minimal interference. There are a number of antenna plotting programs arund that would allow you to plot the potential interference. to determine the possible interference. Colin Lamb |
#22
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Transponder antenna - blade vs stub monopole
On Sun, 15 Jun 2008 11:39:22 -0700, COLIN LAMB wrote:
At 1,000 MHz, RG-58 has a loss of about 15 db per 100 feet. So, a 10 foot run would represent 1.5 db. That is an acceptable loss. It will reduce the range a bit. Generally, if the control cables are not resonant and not in the same plane as the antenna (horixontal controls, vertical antenna), there should be minimal interference. There are a number of antenna plotting programs arund that would allow you to plot the potential interference. to determine the possible interference. That's exactly what I wanted to know. Many thanks. -- martin@ | Martin Gregorie gregorie. | org | Zappa fan & glider pilot |
#23
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Transponder antenna - blade vs stub monopole
Alan wrote:
In article brianDG303 writes: Is there a downside to mounting on a ground plane inside the fuselage of a non-carbon glass glider? Since the ground plane should extend at least 23 inches in each direction around the antenna, it is probably hard to get that inside the glider. That sounds like a dimension for the aircraft communication radio, working in the 120-130 mhz range. The transponder uses 1090 mhz, about 10 times higher. That indicates a 2.3" radius ground plane would be adequate, or the 6" diameter Marc points out as commonly used. -- Eric Greenwell - Washington State, USA * Change "netto" to "net" to email me directly * Updated! "Transponders in Sailplanes" http://tinyurl.com/y739x4 * New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more * "A Guide to Self-launching Sailplane Operation" at www.motorglider.org |
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