I have a dcf77 rx circuit, the loopstick that came with it is tiny, I'd like to replace it with a larger one, I have some salvaged loopsticks from old broadcast receivers, I can pad the lw coil with caps easy enough, but till now I've been using my sig gen via a 100k to measure the resonant freq of the coil/cap as my dip meter doesnt go low ebough.
The freq adjust on my sig gen is very insensitive, so I was thinking of breadboarding a simple oscillator and use the coil/cap as the tuned element and just measure the freq with my counter, if I do this I'm thinking the dcf signal would mess things up, would I get away putting the circuit in a screened box, or is there a better way to do this.
Q might still be an issue as I cant easily measure it, however the b/w of the aerial must be 3kc min to receive audio in its intended application, so 1 hz modulation from dcf shouldnt be an issue.
The freq adjust on my sig gen is very insensitive, so I was thinking of breadboarding a simple oscillator and use the coil/cap as the tuned element and just measure the freq with my counter, if I do this I'm thinking the dcf signal would mess things up, would I get away putting the circuit in a screened box, or is there a better way to do this.
Q might still be an issue as I cant easily measure it, however the b/w of the aerial must be 3kc min to receive audio in its intended application, so 1 hz modulation from dcf shouldnt be an issue.
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