Alex,

Thanks for the feedback and the article info. Looks like I will need to spring for a VNA if I want to measure the common mode choking impedance.

I really like the AA-230. It was very helpful this past summer tracking down some coax issues and checking loss in the coax.

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73,

N2TK, Tony

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From: [email protected] <[email protected]> On Behalf Of Alex RigExpert via groups.io
Sent: Tuesday, October 13, 2020 10:53 AM
To: [email protected]
Subject: Re: [RigExpert Family] AA-230 Zoom - measuring chokes

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Ok Tony,

AA-230 Zoom is not entirely suitable for these purposes, since the analyzer measures the S11 parameter (reflection coefficient).
For such measurements, a device measuring S21 parameter? is required.
Here's a nice article:

Regards, Alex

13.10.2020 17:25, N2TK, Tony via groups.io пише:

Alex,

Maybe I am using the wrong words. I wound a few coils on ferrite cores based on literature. What I would like to do is see if they measure similarly to the literature before I install them. These are common mode chokes. The literature refers the value as choking impedance Rs in ohms at Frequency.

Is there a way to do this with the AA-230 Zoom?

I have attached a sample picture of what I tried to do.

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73,

N2TK, Tony

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From: [email protected] <[email protected]> On Behalf Of Alex RigExpert via groups.io
Sent: Tuesday, October 13, 2020 9:01 AM
To: [email protected]
Cc: Serhii Litvinov <s.litvinov@...>; Ashot Andreev <aandreev@...>
Subject: Re: [RigExpert Family] AA-230 Zoom - measuring chokes

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Dear Tony,

Let me ask you a few questions:

For what purpose do you need to measure the impedance of a choke?

For example, when calculating and manufacturing various filters, we need to know the inductance of the choke (and its Q-factor). But not impedance. The filter (as a ready-made unit) has its own impedance.

It is possible to measure the inductance of the choke with an analyzer (observing some conditions).



Best Regards, Alex

13.10.2020 15:08, N2TK, Tony via groups.io пише:

Trying to measure the choking impedance of some chokes I wound. Using #8 to

display all parameters. Frequency set to 1800 KHZ.

I am getting strange readings.? As an example, chokes wound with a pair of

#75 ferrite cores with 21 turns that should read 13K read Z - 2.3k and R -

292 ohms.

Am I doing something wrong (the usual case) or maybe the AA-230 isn't

designed to do this?

Thanks for any feedback

N2TK, Tony

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