[TowerTalk] Measuring Common Mode Choke with Anritsu VNA

Wes Stewart wes_n7ws at triconet.org
Fri Jan 5 07:47:50 EST 2018

That's "good enough" agreement for me:-)

Wes  N7WS

On 1/5/2018 3:30 AM, Steve Hunt wrote:
> Measuring high-Z chokes accurately is challenging, and it's easy to become 
> obsessive about this stuff. I know because I'm probably one of the worst 
> offenders :)
> But then I ask myself:: if an uncompensated 0.5pF jig capacitance, or 
> uncompensated jig leads 1 inch long, cause an error in the choke measurement 
> that is operationally significant, variations in choke installation method 
> will likely have the same effect and more. On top of that we have to remember 
> the tolerance in ferrite characteristics - variously quoted as 25%. So why 
> strive for measurement accuracy that has little direct relevance to most 
> real-world installations?
> Steve G3TXQ
> On 03/01/2018 12:54, Wes Stewart wrote:
>> In my opinion, and with my equipment, a two-port through measurement is 
>> probably the better method. That said there a lot of folks with one-port 
>> measurement equipment who can make "good enough" measurements on common-mode 
>> chokes.

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