I am making a DD coil for a tesoro tejon. The TX section is measuring 17.4 Khz on a frequency counter. The RX coil is apparently non resonant on this detector. On a dual trace scope, the RX sine wave is leading the TX sine wave. Should'nt the TX sine wave lead the RX signal on this detector? How do I make the RX signal lag the TX signal? add more turns to RX coil? I am trying to get ground balance and discrimination to work properly.
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Tesoro Tejon coil
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I'm pretty new to this but do have 3 dd coils for the Tejon. 10x12 wide scan, 8x11 dd and a Cors Shrew as well as the stock 8x9 concentric.
The 10x12 widescan is a much better coil than the 8x11.
I do have a dual channel scope so if I can make a measurement for ya I will, just let me know where you are reading from on the machine.
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A question to coil builders: The tejon TX coil is resonant at 17.5 khz, but the RX coil appears to be non-resonant, its capacitor is series connected. Ive seen widely different inductances on RX coils made for the tejon from different sources. What determines the non- resonant RX coil inductance (number of turns) to maintain proper phase relationship with the TX coil for good discrimination and ground balance?
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If the RX coil has a series cap then it is resonated, but series resonance instead of the typical parallel resonance. You need to get the RX inductance reasonably close to maintain a proper RX phase so I'm not sure how widely different inductances will work.
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Hope this help,
Nel Tornado spec
TX 910uh 3.2 ohm
RX 17.9mH 74.9 ohmAttached Files
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