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Re: [TowerTalk] Baluns for RX antennas

To: Craig Smith <craig@powersmith.net>
Subject: Re: [TowerTalk] Baluns for RX antennas
From: Jim Lux <jimlux@earthlink.net>
Date: Mon, 23 Apr 2012 09:55:20 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 4/23/12 8:15 AM, Craig Smith wrote:
> I'm using an AIM 4170. Accuracy not the best at high impedances. As a
> rule-of-thumb, I'm comfortable with it to give meaningful measurements
> up to about 2 Kohms and useful relative results up to 5 Kohms.
>

So you short shield and center together on each end, and then measure 
across the whole assembly with some jumpers from Coax on AIM to the UUT?

Or just the center, or the shield?



> 73 Craig AC0DS
>
>
>> The SRF of these chokes is about 2.4 MHz, so they will operate below
>> resonance on 160 and the BCB and above resonance elsewhere. I
>> measured> 7.5 Kohms impedance at resonance, but it is probably higher
>> due to my measurement limitations. The impedance vs. freq is roughly
>> as follows:
>>
>> 500 KHz1.4 K ohms
>> 1 MHz3.5 K
>> 5 MHz4 K
>> 10 MHz2 K
>> 20 MHz1 K
>> 30 MHz0.6 K
>>
>
>
> out of curiosity.. what was your measurement setup?
>
>
>
>
>

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