On 8/4/11 10:58 AM, firstname.lastname@example.org 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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