The baluns(line chokes) are available from DX Engineering or BalunDesigns
mounted in weatherproof boxes. I have measured both and they are very good.
They are very easy to build if you want to go that route and the cores can
be purchased from Mouser who had no minimum order the last time I bought
cores.
73, Dan, N5AR
On Thu, Aug 4, 2011 at 12:11 PM, Jim Lux <jimlux@earthlink.net> wrote:
> On 8/4/11 10:58 AM, larryjspammenot@teleport.com wrote:
> > Does anyone actually offer these baluns for sale as already-built units,
> or as a complete kit, without having to go to each individual manufacturer
> and order just the pieces?
> >
> >
>
>
> what kit? You buy a batch of 2.4" toroids in Fair-Rite #31 mix. Wind
> your coax through it 4 or 5 times. Done..
>
> If you want more choking effectiveness, use multiple toroids. Either
> stack them or do it in series (5 turns through the first one, then 5
> turns through the next one, etc.)
>
> I have to say, I've not noticed any practical performance difference
> between stacking 4 and winding on the stack vs doing them in a string.
> The latter is a bit more unwieldy to handle. It also has better
> performance at high frequencies (at least on the VNA... I haven't
> noticed any practical difference)..
>
> These days... I wind some turns on one core up at the antenna, and then
> do the same near the rig.
>
> You could also order a bunch of 0.5" ID beads in the same mix, and
> string them on the coax, but that requires removing connectors, etc.
>
>
>
> Read Jim Brown's tutorial..
>
>
>
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