IDX-PRO+VDI

[h9361]

Both one and the other are with two tones. Whites 4 is with a switch and an amplitude amplifier in the tx..

Thanks.
About White 4, can you tell me the two Q model?

[Smirnov-Arta]

...

So, "we" end up with a complex, "dirty" signal from the transmitting coil—featuring a "spike" equal to half the amplitude (a spike that will, moreover, pulsate)—which will inevitably affect subsequent processes, so to speak... Maybe it's not worth it?)

[pito]

A friend suggested me the schematic.
I simulated it but my waveform is not correct.

increase L2, reduce C2

[Orbit]

Both one and the other are with two tones. Whites 4 is with a switch and an amplitude amplifier in the tx..

[h9361]

I just thought of another way. Somewhere on these forums someone presented a sinusoidal TX circuit that could achieve a very high voltage drive with a modest power supply. I don't remember much about it, maybe someone will know what I'm talking about and post a link to the thread.

A friend suggested me the schematic.
I simulated it but my waveform is not correct.

[h9361]

Here are two Whites schemes !Both one and the other are with two tones. Whites 4 is with a switch and an amplitude amplifier in the tx..

There is no any attachment, check your post.

[Orbit]

Error

[h9361]

I just thought of another way. Somewhere on these forums someone presented a sinusoidal TX circuit that could achieve a very high voltage drive with a modest power supply. I don't remember much about it, maybe someone will know what I'm talking about and post a link to the thread.

Thanks dear Carl.
I tried to find the forum, but i could not.
About your number 3, can i use the ready inductor as L1?
For testing, do you think i should connect LTX to scope and see its sine form snd amplitude?

[Sergey_P]

Good thing we are not designing radios.

For the receiver, the bandwidth is important, and for the transmitter, the magnitude of the generated field (B~I*N) at a given supply voltage and the quality factor of the radiating system are important.

[Carl-NC]

Regarding to your knowledge and experience, do you have any suggestions for increasing power of TX?

I just thought of another way. Somewhere on these forums someone presented a sinusoidal TX circuit that could achieve a very high voltage drive with a modest power supply. I don't remember much about it, maybe someone will know what I'm talking about and post a link to the thread.

[Carl-NC]

Good thing we are not designing radios.

[Sergey_P]

Powering a series oscillatory circuit from a current source is radio engineering illiteracy.

[Carl-NC]

But is it possible to tell me values of Q1, R1, C1, C2, L1 and LTX?

No, you will have to figure them out through trial-and-error. Here are the values for the MXT (14.8kHz):

R1 = 3.32Ω (1V drive)
L1 = 1mH
C1 = 560nF
C2 = 330nF
LTX = 540uH

The Fisher F75 (13kHz) also has the same driver:

R1 = 12.1Ω (1.1V drive)
L1 = 2.2mH
C1 = 470nF
C2 = 470nF
LTX = 680uH

The PNP can be any decent transistor.

[pito]

high power Tx https://radiolocation.weebly.com/upl...ndantennas.pdf

[h9361]

1. Increase the TX power supply voltage
2. Use a transformer to increase the voltage drive to the coil:
   
3. Use an impedance transformer as used on the MXT:
   
   These are tricky to get right and only provide a 2x voltage boost at best.
4. Reduce the TX coil inductance. For a given coil size, transmitted field energy is proportional to the ampere-turns NI. I is proportional to V/L and L is proportional to N² so, overall, TX field strength is proportional to N*V/L --> N*V/N² --> V/N. So reducing N should boost field strength.

Thanks for your suggestion.
I want to test number 3.
In IDX, TX uses +8 and -8. So, i remove its TX and replace the number 3.
I produces 6.5K pulse using 555 as CLK.
In IDX, TX is 580uH with 1uF.

But is it possible to tell me values of Q1, R1, C1, C2, L1 and LTX?