[TowerTalk] CMC-230-5K

[Roger (K8RI) on TT]

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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