-----Original Message-----
From: measures <2@vc.net>
To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
To: <amps@contesting.com>
Date: 03 August 2000 16:12
Subject: Re: [AMPS] Suppressors
snip
>>In this example, for suppressors which are sort of similar at LF, NiCr
>>results in higher series resistance at frequencies up to 120MHz, and lower
>>above that.
>>
>How about a quote from Wes' measurements to prove your point?
Firstly, I'm not trying to prove any point - I'm just commenting on my
analysis of the data.
Secondly, I'm sorry for not being able to keep up with the speed of
discussion.
I'm afraid you will have to make the columns line up for yourselves. The Rs
values for the copper version are calculated from L and Q in the table -
they are consistent with the conductance values.
Rs and Ls are the series equivalent values of the suppressor.
Copper
MHz Ls XLs Rs
10 112.4 7.1 0.36
20 111.9 14.1 1.23
30 111.3 21.0 2.69
50 109.8 34.5 7.34
100 101.8 64.0 29.07
120 96.3 72.6 42.71
150 85.5 80.6 61.99
200 62.5 78.5 98.18
NiCr
MHz Ls XLs Rs
10 106.4 6.7 0.88
20 103.2 13.0 2.25
30 100.6 19.0 4.32
50 94.8 29.8 10.33
100 75.7 47.6 32.85
120 67.2 50.7 43.10
150 54.4 51.3 58.00
200 35.3 44.4 78.70
Disclaimer - it is highly dangerous to draw general conclusions from this
specific example.
As I understand it, these are two devices which have similar physical
characteristics - when we are looking at electrical characteristics, that's
not necessarily a valid starting point. It would be as interesting to
redesign one of them so that the low VHF characteristics were more similar,
then look at what happened elsewhere.
The most important characteristic by far is the Rs (sometimes referred to as
ESR).
Steve
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