Coplanar coil - newbie questions

[mnichu]

Hi,
I read a US4293816 PDF-patent and I tried to build coplanar coil
(RX - 88 turns, TX- 275 turns and bucking coil has 27 turns). Now I nave to tune it and have some newbie question abuot coplanar coils :
-it is wrote in US4293816 that after nulling in RX coil the amplitude should be less than 6mV, but is not write notihg about ampliture which is given on TX coil.
-the coils tuning with a capacitor on TX side is a must when I will tune coils not in resonanse frequency? Or I must tune coils in resonance frequency anf capacitor on TX side is a must?
-The coils works in oscilating freq. to minimalize loss of energy, is thaht true?
thanks for the help
Michal

[Carl-NC]

It depends on your TX circuit. If the TX coil is part of a Colpitts oscillator, then the resonant frequency is largely determined by the coil inductance, and the tuning capacitor(s). At resonance, energy is mostly transferred between the coil & capacitor, except for ohmic losses. Peak amplitude is a little less than the supply voltage, so look at the patent to see what supply voltage they used.

- Carl