----- Original Message -----
Sent: Friday, August 13, 2004 11:07
AM
Subject: LF: Re²: Tune the loop...
13./08/2004 0944z
Good morning Bryan,
The impedance ( in my case, for the loop # 005
) is around 65 KOhms mesured
at the tune resonnace with a network analyser.
The mesure is not very easy to do because the loop
pick up signals...
I tryed to pack the loop with chicken wire netting,
and put then to the ground,
like a Faraday box. This is not a fine system,
because the network analyser need
an external AC power line...
:0)
To know the impedance is not very important opposite
to the high Z of the input
of the active impedance adaptater ( many M
Ohms).
The most important thing is the quality of the tune
capacitor to keep a high Q and
consequently a narrow band pass ( R // to
L)
In a next time a will try to use a air butterfly
capacitor (~ 500 pF) to tune the complete
band. To my knowledge, this component do not exist,
then: "to it yourself!"
If you are rich (this is not my case!), you can try
to use two vaccum capacitors in
differential structure. (why
not!)
Higher is Q, better is the noise
immunity!
"So many thingamajig to do, so short
time!"
Cheers: Jeff
Sent: Friday, August 13, 2004 8:01
AM
Subject: LF: Re: Re: Re: Re: RX in
OZ
,,,and what is the impedance at the ends of the loop
_before_ Z translator ? ?
S.V.P
Bryan
