[TowerTalk] TH7 phasing-line impedance
Chris Tran GM3WOJ
Fri, 25 Feb 2000 18:45:36 -0000
I'm converting an old TH7 to a 10m monobander, but would like
to retain the original 'phasing tubes' and 'beta match' if poss.
(just to save time, and use the original R-DE to F-DE spacing,
but the 70" long 'beta match' looks far too big for 28MHz
Can anyone tell me what the impedance of the existing phasing-lines
on 28MHz was intended to be - I'm guessing 150-200 ohms ?
Maybe I should just discard one driven element and make a hairpin
match for the other, but I'm hoping to widen the useful bandwidth by
retaining the 2 driven elements (I'm a 6m fan and need to go
on 28885 at times!)
Thanks for any help
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