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.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|