My thoughts as well Jim as I said in an earlier post.
73
Roger (K8RI)
On 4/19/2016 Tuesday 1:06 PM, Jim Brown wrote:
There's something I don't understand here. In 2007, I published the
research upon which all of this is built, with measured data for a
broad range of chokes for the ham bands, and with full instructions
for buying the cores at very good prices, and a "cookbook" for the
various ham bands. Why in hell would you want to pay someone 3x the
cost of doing it yourself, when all you have to do to do it yourself
is wind turns of coax through ferrite cores?
AND -- l would not trust any published power ratings for ANY chokes
without understanding the common mode voltage that they will see in
any given installation. To do that, you've got to put them in an NEC
model that approximates YOUR installation. Simply putting one of these
chokes in a sealed enclosure greatly reduces its power handling
because it greatly reduces air flow around the choke.
73, Jim K9YC
On Tue,4/19/2016 3:30 AM, Jim Thomson wrote:
I just received a pair of CMC-230-5K common mode chokes...from
MyAntennas.com to experiment with.
They are configured as a line isolator, with silver-teflon SO-239s
on each side. They can also be configured as
a balun, with a pair of standoffs on the balanced ant side if you
like. Extremely well designed and built, better
than I expected.
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73
Roger (K8RI)
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