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#11
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Comm Ant. Top or Bottom?
"RST Engineering" wrote in message m... BTW, what makes you think that I have a high SWR? Normally sailplane communicate with their crews and other sailplanes on 123.3 or 124.5 MHz. I have tuned my antenna for 123.3 MHz At that frequency the SWR is 1.2 to 1. At the extremes of the comm frequencies it does not exceed 2 to 1. I do not find 124.5 as a legal sailplane frequency in my copy of the FCC regs. Mind giving me a pointer to it? BTW, snippety doo-dah, snippety aye is a GOOD thing to do. Jim You are correct, I can't type. The frequencies are 123.3 and 123.5 MHz. BTW. I own one of your RST-721 test sets and love it! "Snippety doo-doh, snippety aye ..." Tuning complete. Wayne HP-14 "6F" http://www.soaridaho.com/Schreder/HP-14/N990/N990.html |
#12
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Comm Ant. Top or Bottom?
"Wayne Paul" wrote in message m... "Stuart Fields" wrote in message ... "Wayne Paul" wrote in message ... Mine is a bent 1/4 wave length antenna mounted on the top of the metal tail cone. My radio is a 1 watt Filser ART 57. So far I haven't had a problem communicating airborne aircraft or ground stations. http://www.soaridaho.com/Schreder/HP...P-14_N990d.jpg http://www.soaridaho.com/Schreder/HP...0_Borah_Mt.jpg http://www.soaridaho.com/Schreder/HP.../N990_rain.jpg Wayne HP-14 "6F" http://www.soaridaho.com/ Wayne: All my experience with antennas says that you are not getting as much as you can due to the high VSWR. That said, if you are getting everything that you want, why change? Those photos are great. I can understand why you fly one of them "quiet things". Still haven't gone for a sail plane ride but it is certainly in my "round to it" bucket. stu Thank you for the complements on the picture. I really enjoy the old HP-14 homebuilt. It was designed in 1964. Mine was completed in 1973 (I purchased it in 1999.) On Aug 7, 2007 I managed to complete a declared 300 km flight. http://www.soaridaho.com/Flights/6F_Gold_Distance.html If you ever have the opportunity to get a flight in a high performance two-place sailplane ... do it!! BTW, what makes you think that I have a high SWR? Normally sailplane communicate with their crews and other sailplanes on 123.3 or 124.5 MHz. I have tuned my antenna for 123.3 MHz At that frequency the SWR is 1.2 to 1. At the extremes of the comm frequencies it does not exceed 2 to 1. Wayne Amateur Radio W7ADK Wayne: My comments were based on measurements taken on my helicopter with the bent antenna with both a Bird 43 Power meter and an MFJ antenna analyzer. The VSWR was never better than three. Discussions with the antenna mfr showed their claims were a minimum VSWR of 3. Yeah here I set at Inyokern CA where an acquaintenance of mine got a Silver C in a Cessna 170. Some 5 hours aloft with a dead engine. He said that the only reason he had to come down was the sun was setting and he got very cold at around 20,000msl. The airport is only 4 miles away and a mountain ridge ride is only $100. Too dang many irons in the fire is my only excuse. That and I don't want to get hooked into another aviation area right now. Stu Retired EE. Also amateur radio tech license. |
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