Quote:
Originally Posted by rajesh
hi max i also buit a t/r locator 2048 hz. transmeter working well. but i have problem in receiver coil in L/C network. there are coil size too big for testing purpose [12 inch diameter ] 26 awg - 15mh inductance. can you recmond me a small coil /capecitor for 2048 frequency.......... you knowe that this device is working in russian side. gary lecomte modified this
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Hi,
I don't know about this specific design...
but if need a good coil for 2048Hz range and capacitor for it I suggest this one:
wind on 300mm former 51turns of 30AWG wire (0.25mm bare wire, 0.28with varnish); coil must be tight and rigid.
Use 3u3 poly cap with it...
Then run a small coil (explorative coil, say 100turns on 2.5cm diameter) with a frequency generator at 2048Hz, try to get maximum output voltage from resonant tank, can use ac voltmeter or scope for that.
If have to lower frequency add 1 or more turns to coil, otherwise less turn.
If need e.g. 20cm coil can try this:
use 67turns as start, 200mm former, 30awg wire , cap always 3u3 poly.
Change turns as described, tune for max output voltage at 2048Hz.
To get exactly 2048Hz can use a 32768hz xtal oscillator (cmos gates one is ok) , then divide by 16 using a ripple counter like 4024, input at pin1 and output at pin6 ...div by 16).
Then can drive a transistor with small coil (explorative) as load.
Kind regards,
Max