RF CHOKE RG213 4 or 5 turns measurments

[Henry HPSD]

Hello Guys,

Thought I would share what I measured...
I made an RF Choke (wound around 10cm PVC tube so the diameter is 11 cm hart to hart) its airwound... and not touching anything.
The Coax used was RG213UBX.




With 5 turns the transmission loss around 27 MHz was just over 20 dB and "peak" frequency lies about 10 MHz higher.
It works, 20dB transmission loss is what most consider to be "just good enough"



But with 4 turns we can achieve better results:


Over 30 dB from 26-28 MHz with peaks of 35 dB.

For those who cant measure an RF Choke with an VNA :
You might keep 4 turns 11cm diameter as a good reference point.


Hope it is of use,

Kind regards,

Henry

 

[357]

I hd to retire my ugly balun. It was 16 years old and the braid and center was black. Now coax is so expensive I'm struggling to find a replacement.
Mine was 11.9 feet and 7 or 8 wraps

 

[VMC]

I get all my coax from these folks. Great prices:

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Not had to test the customer service though since Joel went SK