[TowerTalk] Cost of building W0IYH chokes

[Jim Lux]

Expensive in an absolute sense, compared to a case of beer or wine.
However, how expensive is it in the context of the total station value?
And, do you really need 36 chokes?  For that kind of volume and scale of
installation, some work with a current probe and fabricating tuned traps
might be a better scheme.  You might also, in a custom installation kind of
sense, be able to custom design your chokes for a particular desired
performance.  Perhaps, a big toroid with multiple turns of the coax through
it might be a better solution... 10 turns through a toroid will have
inductance comparableto 100 single turns (i.e. pass through) a large bead.
Some time with the Fair-rite catalog might be well spent.

----- Original Message -----
From: "Tim Duffy" <k3lr at k3lr.com>
To: "Towertalk" <towertalk at contesting.com>
Sent: Sunday, August 24, 2003 10:52 AM
Subject: [TowerTalk] Cost of building W0IYH chokes


> Several guys have sent me emails about the cost of building these
> chokes. Yes, they are expensive. The 100 beads you need are almost
> $50.00 on their own from Amidon. When you add in 48 inches of double
> shield teflon coax cable and two silver plated PL259s the cost is up to
> about $56.00 for the raw materials. You can imagine the project to
> assemble and install 36 of these chokes at every antenna feed point,
> every tower mounted RF switch box, and each of the amplifier outputs at
> my station!
>
> I use 3 1/2 wrapped layers of 88 tape, wound in opposite directions to
> weather proof the chokes. On the 2nd wrap I put ScotchKote, then when it
> is dry, follow with the 3rd wrap of 88 tape.
>
>
> Hope this helps.
>
> 73,
> Tim K3LR
> http://www.k3lr.com
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