[TowerTalk] CM Choke

[Wes Stewart]

As I said, I can't find the data.  The N2PK was an early version which I did not 
add USB to so I ran it on an old Toshiba laptop with WinXP and a parallel port.  
I broke it out and fired it up but no data to be found.  I probably saved it on 
a floppy disk.  This was 10 years ago and I've lost a wife and had a number of 
issues since then so memory if foggy.

The Boonton is long gone due to downsizing.  I have the N2PK still but have 
moved on the the DG8SGQ analyzer.

The photos I took were of a general nature and not necessarily the final 
measurement configuration, so reliance on them is a dubious proposition.

There is a plethora of papers and messages by the likes of N2PK, N6RK, DG8SAQ, 
OZ7OU that examine these types of measurements in detail.

Another fun and slightly related paper is here: 
http://www.tuks.nl/pdf/Reference_Material/David%20Knight%20-%20The%20self-resonance%20and%20self-capacitance%20of%20solenoid%20coils.pdf

Wes  N7WS

On 10/11/2017 11:04 AM, Jim Brown wrote:
> On 10/11/2017 6:46 AM, Wes Stewart wrote:
>> With a decent vector network analyzer, the ports are already well-known (50 
>> Ohm) terminations.  If the round robin you mention was in the July 2007 time 
>> frame then I was a party and measured the device using both my N2PK VNA and a 
>> Boonton RX meter.  I have pictures of the setups, but alas can't find the 
>> data.  I got some feedback that you said of my measurements, that they were 
>> "dead nuts on." :-)
>
> Hi Wes,
>
> Yes, that's the round robin I was referring to. Although my memory of it was 
> that the Boonton data was spot on, while other data was not. But since you did 
> it, I'll trust your memory over mine. :)
>
> If your VNA data did closely match the Boonton data, we should talk off list 
> about your setup of the N2PK VNA, which is well known to be a fine unit.  I 
> certainly would like a method I can trust that is a lot less work than the 
> voltage divider method.
>
> 73, Jim
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