"Reg Edwards" wrote in message ...
New program SELFRES2.exe
--------------------------------------
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.

Performance is based on a choke wound with coaxial cable of the same type as
the transmission transmission line in which it is inserted. Conductor
diameter is that of the coax outer. It behaves a single wire. Coax inner
diameter is of no consequence.

Choke insertion loss is a measure of the reduction in power radiated from
the feedline. But, despite the attention it attracts, actual power radiated
from the feedline WITH the choke will never be known because the power
radiated WITHOUT the choke is indeterminate.

SELFRES2 is 51 K-bytes. Download from website below in a few seconds. It is
not zipped-up and will run immediately.
----
.................................................. .........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. .........

Wunnerful! another gem from The Reg. I took the revised version out
for a couple test drives and it's very nice. As usual.

However I have an ongoing problem of a very practical nature involving
how to "wind" a true solenoid from coaxial cable. Turns out that at
the moment I'm pondering how to build as lightweight as possible
chokes made from RG-58 coax for 30, 20 and 2M dipoles. Does anybody
around here know how to fabricate a proper coax solenoid without
having to resort to some beastly heavy coil form like PVC pipe? How do
ya wind one which holds its shape out in the WX without a coil form?
Is there some magic goop out there which can bond the turns together
or what?

w3rv