[TowerTalk] CM Choke Cookbook

[Grant Saviers]

I've made 20+ with RG142 using the "cookbook" smaller coax turns and 
core counts, 160 to 10.  Measured with my VNWA the L & R values are near 
the expected.   The TFE is UV resistant and some chokes are in PVC 
junction boxes and some not.  At 6m the RG142 is at its QRO limit, below 
that it is fine QRO+.  My 142 is the double braid silver plated version, 
it comes both ways with the same obsolete RG unless it is MIL marked as 
mine is.

Grant KZ1W

On 9/22/2017 13:48 PM, Jim Brown wrote:
> On 9/22/2017 8:16 AM, David Needham wrote:
>> I have made several full power CM chokes for 80m and 160 m using 
>> RG213 and
>> Mix 31 toriods per your articles. Do the number of cores or turns count
>> change if I use RG142 for lighter weight?
>
> Dielectric and o.d. of the coax both affect resonance. I have no data 
> for RG142, but I suggest that you start with the guidelines for 
> RG59/RG8X.
>
> 73, Jim K9YC
>
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