[TowerTalk] CM Choke Cookbook

[Stan Stockton]

RG-400 is way better in my opinion because of stranded center conductor.

Stan, K5GO

> On Sep 22, 2017, at 6:01 PM, Grant Saviers <grants2 at pacbell.net> wrote:
> 
> 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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