[SixClub] vertical antenna(directanswer)

[Roger (K8RI) on Six]

Well, shucks....

Every one knows the way to get gain is with a dish. Just look at what they 
do with those lossy microwaves.  Let's see, we'd need what size for 30 db on 
six? <:-))

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com


> That is true, I am sorry I quoted from memory and that is getting old. L. 
> B. Cebik, W4RNL in an issue of QST some time back, stated some 1296 gain 
> measurements with rhombics the best actual gain measured was 20DB over a 
> dipole.
>
> You should be able to beat that at 6 meters as I believe the surface 
> resistance 1296 mhz would be greater than at 6 meters. I could be wrong. 
> Still it would be hard to obtain 20 db with beams.
>
> Jerry W9FS
> -------------- Original message ----------------------
> From: Steve Katz <stevek at jmr.com>
>> You'll never achieve 30 dB gain with a six meter rhombic, no matter how
>> large you make it.  It might be possible to achieve such high gain with a
>> large array of stacked rhombics fed in phase, assuming the divider losses
>> are very small.  The problem with a "30 dB gain" rhombic is that it needs 
>> to
>> be 560 feet long (at 50.125 MHz) and the loss in wire that long counters 
>> the
>> effect of any potential gain.  Without being able to rotate the system, 
>> it
>> would be almost entirely useless because the front lobe, to achieve such
>> high gain, will only be three degrees wide.   If you're not aimed 
>> precisely
>> at the target, you'll miss it. -WB2WIK/6
>>
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