[amsat-bb] An aerial gain question

[Phil <phil@xxxxxxxxxxxxxxxx>]

Hello All,

I've been experimenting with UHF aerials for the past 18 months and although 
the aerial that I'm using (a 12 element design by DK7ZB) is the best that I 
have built, I feel something is lacking.

I have followed the design carefully and all dimensions are within 1 mm. The 
only deviation that I can see is that the elements are not exactly at right 
angles to the boom, some slant forward and a few slant backwards. A 
measurement at the tip of adjacent elements shows a difference of up to 6 mm 
either side of the boom. The element spacing at the centre of the boom is 
correct to within half a millimetre.

Would this inaccuracy have a significant effect on the gain? I don't think so.

I can hear myself through FO-29 and FO-20 at no better than S3 early in the 
pass. That's S3 on my FT-847 with the internal pre-amp turned on.

I'm working on an elevation system and maybe that's all that is lacking.

-- 
Regards,
Phil
phil@spiderweb.com.au

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