Quote:
Originally Posted by WM6
Model is AL718.
Capacitor in thank circuit depends on VLF signal transmitter frequency in your region.
In schematic given capacitor can be of little use if there are not radio signal inside tank circuit resonate frequency.
But even there are not VLF radio signal, you can build weak, simple and cheap transmitter tuned at AL718 frequency and put it in field of your search ten meters away.
You need to tune your AL718 ferrite antenna at the best directivity by changing ferrite rods mutual distance and coils position. You need transmitter for such tuning placed of about 50 meters away (good one is battery powered signal generator with two wires - one inserted in earth and other as antenna up in air).
For some additional idea about transmitter you can look here:
http://franitzasab.webs.com/transmit...kitreviews.htm |
hi wm6
Please put a transmitter that is above.I have not found such a transmitter on the Internet.Please put the transmitter.??
Put in attachments pcb gg817 in sprin layout
enjoy