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Subject: re: Dayton Johnson's 1296 double rhombic.
Date: Fri, 29 Nov 1996 22:27:08 +0100
At 10:45 29/11/1996 -0600, you wrote:
>Bernie nuls wrote:
>> Dayton Johnson's 1296 double rhombic.
>> 29 Nov 1996 10:08:20 -0600
>>On page 90 of December QST is a picture of Dayton Johnson and his award
>>winning 1296 MHz. double rhombic. Does anyone know where he got the
>>from or wether he designed/optimized it himself for 1296?
>>I'd very much like to copy his design and build something similar for
>>(about the same gain, but with much lower visual impact than my 33
>>element loop yagi).
I don't know about the 23cm design but I do remember seeing a 70cm double
rhombic described in 73's magazine around 1978 (+/- 1 year).This one should
be the inspiration source for the 23cm antenna.Just one word:gain is OK to
win gain contests but more important is G/T.For Rhombics G/T is very poor
due to low efficiency (loss in terminating resistor),the very poor
efficiency is OK on HF,but not on VHF/UHF.Noise temperature of the antenna
is very high.So if you want a good antenna built something else.
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