does anybody remember how these box's were configured ?
Buried some where in mu old W2PV material... there is a diagram of one.
Think it used a pair of P+B DPDT relays. This is for 2 x identical
40m yagi's... that's it. It only has to be configured for one band.
Last time round... I designed a simple LC box for a buddy who has 2 x 40m
yagi's.
The 2 x ant's were always drioven in phase. The LC box was simple.. just a
mess
of shunt NPO 5 kv doorkno caps at left end. [ hot to grnd] followed by a
series
cu tubing coil. 50 ohms in... and 25 ohms out. The 25 ohms consisted 2 x
coax
connectors.. wired in parallel. 2 x identical length 50 ohm cables... one
per yagi.
I was going to suggest adding bip/bop capability... since that only involves
adding
1 x spst vac relay.. and one x 1/2 wave of coax.
IMO... I think BIP /BOP would be plenty. However.. there maywell be cases
where the top
ant by itself would be louder than both in phase..... and ditto with bottom
yagi [vs BOP]
Is the U/L/B box in one of the books ? If it is..it's buried good. This is
just for one band... no
broadband xfmr's required.
Tnx........ Jim VE7RF
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