I see from your signature that you have an interest in quality ales.
Bill
TV Aerial Experiment
Feb 07, 2008
35 Replies
Thanks everyone! Now I know.
NT
Something no-one mentioned here was the lack of a balun which could wreak havoc with weak digital signals due to standing waves on the cable. The most popular home-made types these days seem to be the bow-tie + reflector + balun design.
(kim)
Does the lack of a balun actually cause standing waves on the cable?
No but it helps eliminate them :o)
(kim)
Is there a way to make a balun that wouldnt cost more than 10p?
NT
Suyrem if you buy the toroids in bulk. Or nick them from scrap items.
Yes. I think the ones sold by Maplin cost less than 10p each to make :o)
(kim)
I'm sure there was a Wireless World article called "a balun for 10p" - some
40 years ago, I suspect.
In that case wouldn't it have been "for 2/-"?
;-)
make it 36 years ago.
This one of course!
MBQ
Oh dear, my brain, such as it is, substituted the 'l' for an 'n'!
Which one? This thread is crossposted.
Well I finally got a few minutes to spare and made one. Didnt have time to measure an existing one, so just vaguely guessed. It works, albeit rather badly. Picture is quite a lot better than it was with no gain though, so there must be a handful of dB there. Unfortunately me camera's broke though.
NT
A Yagi design isn't the best basis for a home made aerial, particularly if it's to be used indoors. The bi-square is a lot better for analogue and the bow-tie plus grid-reflector seems to be very popular for digital.
(kim)
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