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Offline numisNGSTopic starter
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« on: August 11, 2017, 10:33:53 am »
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Hello
My TGSL TX amplitude is 5,5 v , is that can make a problem ?

how can I control TX amplitude ?

thank you .

best regards.

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« Last Edit: August 11, 2017, 10:52:49 am by numisNGS » 		Logged
Offline Homefire
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« Reply #1 on: August 11, 2017, 12:56:38 pm »
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At what point are you making this measurement and are you using for ground point ?  Are you measuring in AC ?

C1 and C2 are working as a Voltage Doubler.  You should be seeing 2 x the 8v supply or 16Vac.

 Huh?


""1. The basic Colpitts oscillator. Together with the transmit coil attached to J1, it provides a
14.5 kHz low power Tx signal to the coil, audio circuit, -5v converter and a signal to use as a
phase comparison for the receive circuit. Tx amplitude should be in the 16V range.""

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Offline numisNGSTopic starter
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« Reply #2 on: August 11, 2017, 01:09:40 pm »
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I made the measurement on TX connector of course with TX Attached to pcb .
one of the TX coil is a ground point . there is no problem about how I did the measurement but I think it's about the circuit it self . I made three TGSL pcbs with the same problem.
I find schematic with 2.2 K VR instead of uysing 2k2 resistor "R1" .
thank you best regards

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« Reply #3 on: August 11, 2017, 01:19:27 pm »
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2k2 is the same as 2.2KR  Huh??   If your not using the GEOTech schematic I have no ideas. Cheesy

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« Reply #4 on: August 11, 2017, 01:27:16 pm »
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there is an other schematic R1 is 2k2 variable resistor, instead of using normal 2k2 .
do you think that will help to adjust TX amplitude?
thank you .
best regards

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« Reply #5 on: August 11, 2017, 01:44:14 pm »
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If you not seeing the 16vac the circuit is not corrector or your power supply has issues. 

Are you getting the 14.5 kHz??   Maybe your Test equipment is loading the circuit ?



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« Reply #6 on: August 11, 2017, 02:44:04 pm »
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yes I get 14.45khz
and my test gear is respectable.
thank you I will try and tell you some news tomorrow .
thank you homefire.
best regards 

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