quartz for tx ?

[gallico58]

For my tests I simply used a bc327(pnp) transistor buffered by square wave 4060 I get the output (trans collector) 16v sinusoid perfect trimmer setting with power 8 v
Are simple experiments I'm doing, thank you very interesting feedback, hello!

[kosacid]

also use a cap on rx and tx that way you should get good tranfer

[gallico58]

Hello
Always starting from tx quartz, preamplifier and raptor type sampling I get these signals to the oscilloscope.
I used to integrate preamps NE5534. Output maybe too high i have to quarrel again with the coil, i wonder if phase shift rx coil dd must be 200 ° late or early tx?

tx
nulling
disc min-max
geb central

[Qiaozhi]

Hello
Always starting from tx quartz, preamplifier and raptor type sampling I get these signals to the oscilloscope.
I used to integrate preamps NE5534. Output maybe too high i have to quarrel again with the coil, i wonder if phase shift rx coil dd must be 200 ° late or early tx?

[ATTACH]39685[/ATTACH] tx
[ATTACH]39686[/ATTACH] nulling
[ATTACH]39688[/ATTACH] disc min-max
[ATTACH]39687[/ATTACH] geb central

Is the RX signal in your attached images taken from the preamp output?

[gallico58]

[QUOTE = Qiaozhi; 231318]? E 'il segnale RX nelle immagini allegate preso dall'uscita preamplificatore [/ QUOTE]

Yes
Quiaozhi, I think it's a bit high (600mv) but is the fault of the coil dd built nulling hard. (6mh tx - 6.5mh rx)
With that phase shift it seems that the raptor sampling can also center to 8.7khz, what do you think?

[Qiaozhi]

[QUOTE = Qiaozhi; 231318]? E 'il segnale RX nelle immagini allegate preso dall'uscita preamplificatore [/ QUOTE]

Yes
Quiaozhi, I think it's a bit high (600mv) but is the fault of the coil dd built nulling hard. (6mh tx - 6.5mh rx)
With that phase shift it seems that the raptor sampling can also center to 8.7khz, what do you think?

If the 600mV signal is at the preamp output, then it looks ok. The preamp gain is 19.6, so the residual RX signal at the coil is 30.6mV. I've built working coils with a residual voltage that's higher than that.