Yagi Antenna Design by W2PV, page6-3.
Arne N7KA
----- "Jim Thomson" <jim.thom@telus.net> wrote:
> 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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