Owen Duffy wrote:

Tony Giacometti wrote in
news:sO2dnUZbkeShCaLanZ2dnUVZ_v2pnZ2d@hawaiiantel. net:

Owen Duffy wrote:

Owen Duffy wrote in
:

...
It is questionable whether the parallel tuned circuit is an efficient
coupling method for a low Z receiver.

I am able to get a noise peak tuning the capacitor and the preamps I
use are supposed to be a match from approx 25 ohms to about 125 ohms.

Tony,

I have written a program to solve for transmission loss from the source
being the emf induced into the electrically small loop through to the 50
ohm receiver load on the output. The program models the transmission line
stub on one side of the loop gap, and the transmission line on the other
side to the tuning capacitor and 50 ohm load.

I need to do some more checking, but the program results support my
proposition that parallel "tuning" is not an efficient coupling.

The only way to ensure a near 50 ohm receiver for test purposes is to put
a 10dB 50ohm attenuator in front of it. If you are able to do such, does
the receiver noise peak with the loop tuning capacitor at minimum C?

Owen

I dont have access to an attenuator or anything that would work as one.
Right now the loop gets max noise with about 2/3 max capacitance.