Re: [amsat-bb] Need recommendations on 435 yagi feed

[John Wright <g4dmf@xxxxxxxxxxx>]

At 14:07 13/09/2001 -0400, you wrote:
>What I'd like to achieve is switching between left-hand and right-hand
>circular polarization with an antenna I have on hand for the 435 MHz uplink.
>I've read everything I can find, including the latest Satellite Handbook,
>which illustrates some methods in Figure 10:11.  I also have on hand a very
>low loss relay with N connectors.
><<SNIP>>



>K8AC
>Floyd Sense - Angier, NC
>
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The 95 ohm coax is very hard to get. BUT if you take the appropriate length 
of 50 Helix cable ( like Pope H100 ), pull out the center conductor and 
replace it with a thinner center conductor, Not sure how thin, but that can 
be calculated, you can make yourself a piece of what should really be 100 
ohm cable. N 'T' pieces are about £10 stirling in the UK ( about $15 ), so 
you should be able to get them for less than the price you quoted. I used 
this system many moons ago in AO13 days. so it works. Incidentally the 1" 
offset of the feed point makes very little difference to the phasing.


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