[TowerTalk] Winding Beverage RX Balun de K0FF

[n4kg@juno.com]

AMEN !

I used to use small cores with small wires but kept
losing them to nearby lightning strikes, especially on 
my East Beverage which runs parallel to my incoming 
power line for 150 ft, spaced 50 ft.

After going to 1 inch diameter cores and #20 wire, 
no more problems.

de  Tom  N4KG

On Sat, 16 Sep 2000 "Maurizio Panicara" <i4jmy@iol.it> writes:
> 
> After some bad experiences, to prevent damages from (indirect) 
> lightning
> strikes I stopped with using small cores and thin wires turning in 
> favour of
> medium-large toroidal ferrite cores (AL = 4000, or more),  and also 
> thicker
> winding wires.
> This produces a transformer that's more symilar to a transmitting 
> than to
> receiving device, but finally it's not a disadvantage.
> With a convenient (for a practical winding on a board) primary of 
> 2-3/4
> turns and  8-3/4 turns in the secondary, the transformer perfectly 
> covers 5
> octaves, obviously including the 160m band.
> 
> 73,
> Mauri I4JMY
> 
> 
> ----- Original Message -----
> From: "Tom Rauch" <w8ji@contesting.com>
> To: "Tower Talk (mail list)" <towertalk@contesting.com>;
> <topband@contesting.com>; "K0FF" <K0FF@ARRL.NET>
> Sent: Saturday, September 16, 2000 2:31 AM
> Subject: Topband: Re: [TowerTalk] Winding Beverage RX Balun de K0FF
> 
> 
> >
> >  Hi George,
> >
> > > Anyway this one is four windings of 16 turns each to make both 
> the
> primary
> > > (3 windings) and secondary (1 winding....the impeadance ratio is 
> the
> > > SQUARE of the windings ratio), and the little paper tags you see 
> are to
> > > help me remember which phase is which. The core is an FT50-75 
> and I've
> had
> > > good results here with similar layouts. There are two schools of 
> thought
> >
> > If you use the correct core, two turns are enough for the primary
> > and five for the secondary for 75 ohm. I hate winding a bunch of
> > turns, plus the winding is more prone to failure.
> >
> > For 50 ohm cable, make it a two turn primary and 6 turn secondary.
> 
> 
> 
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