Impedance matching on a random wire antenna may or may not do much good. It
is considerably more helpful with short wires. The most useful impedance
match you are likely to get is that obtained with a 9:1 transformer at the
base of your antenna before the coax. Take a look at my website (long
overdue for an update).
www.kc7nod.20m.com

"Dave" wrote in message
...
Oh. An impedance matcher. Never was much good with those... Does this
match the impedance of the random wire to that of the radio input? That
would be good too... Yes, an L network, that was what it was called I
think. I marked it, to go back to it.

Thanks,

Dave


"CW" wrote in message
...

"Dave" wrote in message
...
What you saw in the antenna book was not a misprint. It was an L network
tuner. It is an impedance matcher, not a preselector.


Gotcha. That was the only way I could figure it. I saw something
almost
similar (is that like almost pregnant?) in my Practical Antenna
Hanbook
(Joe
Carr) last night, but suspect it is a printing error. It was an
series
inductor following behind a capacitor shunt to ground. Only that
would
(I
think) choke off RF and shunt it to ground. (Am I wrong?) Have been
trying
to figure that one out all day. Last night I fixed my big solder gun,
and
can now solder a ground wire to the grounding rod outside my bedroom
window.
Hope to do that tomorrow.

I am definetly going to set this up. Have already tested several of
my
small capacitors, but they do not appear stable enough for anything
serious.
Just to familiarize myself with the mathematics, I have already
calculated
the inductors I would need for the first one I tested. Just finished
removing a better variable cap from an old junk shortwave radio (a
Luke,
I
think) and am going to try to use it. May have a problem with my
meter
though. May have to take the variable cap to the shop and have it
tested
on
a known good LCR meter (gotta get one of those. I a currently using a
DMM
with limited capacitance capability.) If I do that I'll take my
calculator
and notepad with me, so I can figure out and write down the values of
inductance I need. Damn I'm having fun.

Thank you very much for this suggestion. It is much appreciated.

Dave