TGSL Tuning & troubleshooting

[BKY1337]

i have measured between collector and tx1, tx2, rx1,tx2 and got nothing.

[homefire]

Check for Oscillation on collector of 2n2222. Your meter may be loading it enough to prevent it from Oscillating.

[homefire]

If you look at the TX Oscillator arrangement the Two Capacitors work as a Voltage Doubler.

[BKY1337]

How much Volts needs the Colpitts Oscillator at the input (24k Resistor).
I have only 0,758V there and nothing is oscillating.

I think the problem is here and i can trace it until i gonna find the error without disassembling the whole board.

And how can somebody get about 16 Volts at the TX testpoint? Is this the battery Voltage with a stronger battery?

[BKY1337]

I got:

1: -10,27V
2: 184,4mV
3: 138,3mV
4: 113,4mV
5: 3mV
7: about 20mV and changing

Pin 6 of 4024 is 1,375V

All measured in DC with negative Probe at battery minus.

[ripsdevala]

Dang Dude you making me work here. Anything not connected to ground is not shielded on coil .

Rx don't need shielding???

[BKY1337]

Thank You!

Are the voltages the ones from blobber testpoints?

[homefire]

Dang Dude you making me work here. Anything not connected to ground is not shielded on coil .

Ok, How about this one ? I pointed to ground side of Tx. Test Point one is the Tx on GND Side. Source is next point to right.

[BKY1337]

i cant find the two transistors at the right side, it looks different for me sorry.

And i dont know which voltages i need to have. Are they the same as in the schematic?

[ripsdevala]

Homefire, that part of the coil is not shielded?

[homefire]

Yes it's the same. I have the board right here in front of me. I'm working one here my self. Working on a coil even as I type. LOL

[BKY1337]

Thanks, but i think this is not my silverdog version of the TGSL EDU.

[homefire]

See if this helps.

[BKY1337]

Thank you , i already know the testpoints but i have problems to find them at my PCB.
Can you mark it red at this picture? Or someone else?

[ripsdevala]

Try this blobber test point