Reg Edwards wrote:

New program SELFRES2.exe
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Input data :

Length and diameter of solenoid.
Number of turns.
Conductor diameter
Length of line in which the coil is inserted.
Testing frequency.

Output data :

Coil self-capacitance.
Coil self-resonant frequency.
Choke impedance vs frequency.
Insertion loss of choke in dB.


Reg, please could you make the terminating impedance a user variable
too? (There's space for just one more parameter.) That would allow choke
performance to be calculated for the standard test conditions of 50 ohms
source and 50 ohms termination.

Real-life source and load impedances are, as you say, indeterminate (or
largely so). However, there still needs to be a standard test
environment for comparing published data for different chokes, and
comparing predictions against measurements. 50-50 meets that need.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek