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#4
August 7th 09, 06:54 PM
posted to rec.radio.amateur.antenna
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Log periodic antenna
"professorpaul" wrote in message ... Does anyone have design for a log periodic antenna comparable to the Elk one for 2 meters and 70 cm. I'd like to build one for satellite work, and with the log periodic, I believe I could avoid the diplexer issue. Please respond directly to Thanks! /paul W3FIS Hi Paul "For what it is worth", I support Jim Lux's advice. A 70 cm Yagii wont couple much power from the transmitter when sending on 2.meters It would be easy to test the effect of shunting the 435 receiving Yagii with the 2 meter Yagii. You could even do that with EZNEC. An antenna like Jim suggests would be easy to build on a broom stick to test the effects of the 'other antenna'. The principal value of the Log Periodic is it's bandwidth. That is not significant when only two discrete frequencies are considered. A disadvantage of the Log Periodic is it's limited gain. I fail to see where the Log Periodic benefits the user when only two frequencies are being considered. Jerry KD6JDJ |
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