Telamon wrote:
I read his post correctly his concern is a 12 KHz wide DRM signal and
that the tuned loop response will be to sharp and narrow. Firstly he
needs to build the loop and sweep it to see if has a problem to begin
with. Parasitics may cause the loop response to be wide enough that 12
KHz will not be a problem. If it turns out it does he can add
resistance, which will decrease the peak response and broaden it. Adding
resistance will cause the loop to not work as well but that is the price
you pay for greater bandwidth.


Normally the best thing is to over-couple the loop to the receiver,
rather than loading it with a resistor.

The Q of the loop is not only a function of the loss resistance and L/C
values, it is also a function of the loop loading caused by the
feedline/receiver combination. That introduces resistance to the
system.

Adding a resistor is the last think I'd do. If I had a bandwidth
problem in a resonant loop, I'd simply overcouple to the feedline and
let the feedline/receiver resistance load the antenna.

73 Tom