[RFI] Common mode choke on 4 Square feedlines without skewing phasing?

[Jim Brown]

On 2/18/2019 11:40 AM, tony.kaz at verizon.net wrote:
> Thanks for the input. I use dumped power to check the bandwidth. Okay, will
> use RG400 for the chokes.

That's 50 ohm coax, so not ideal for your application.  KZ1W sent me 
some miniature TFE coax to measure, the size of RG179, which is 75 ohms 
with FEP jacket. That would be a better choice. Because it's so small 
(0.1-in o.d.), dissipation is fairly high, so it will be important that 
it be exposed to air.  I'm currently developing winding guidelines for 
it. Because it's so much smaller than RG400, they are very different.

> I would assume to test the 3/4 wave line I would
> have the choke attached.

Yes.

73, Jim K9YC