TGSL just one beep when switching off Troubleshooting

[kurumbaj]

Hi everyone!
I have built the TGSL, but i can't get it come alive... So, the only thing it does is one beep when i'am switching it off.
The coils are 6.6 and 6.04mH.The nulling goes to 0.06V on multimeter, or about 100mV on oscilloscope. The supply voltages are ok, i have -6VDC, +12VDC, + 8VDC, already have changed the FET's. I don't have 2CH oscilloscope.When i connect the scope to U101 7th pin, i see that signal is increasing when i'am waveing above coils. The coils are connected to PCB with two shielded cable, separate cable for TX and RX.(Tx freq is 13.89KHz)
Any suggestions before i end up in madhouse? Thanks in advance.

[Qiaozhi]

Hi everyone!
I have built the TGSL, but i can't get it come alive... So, the only thing it does is one beep when i'am switching it off.
The coils are 6.6 and 6.04mH.The nulling goes to 0.06V on multimeter, or about 100mV on oscilloscope. The supply voltages are ok, i have -6VDC, +12VDC, + 8VDC, already have changed the FET's. I don't have 2CH oscilloscope.When i connect the scope to U101 7th pin, i see that signal is increasing when i'am waveing above coils. The coils are connected to PCB with two shielded cable, separate cable for TX and RX.(Tx freq is 13.89KHz)
Any suggestions before i end up in madhouse? Thanks in advance.

If you have an external trigger input on your one-channel scope, you can still trigger from the TX signal while monitoring the preamp output. Then you can check the phase-relationship is ok.

[kurumbaj]

It seems that my scopes external trigger line doesn't working.. any suggestion?

[beerguy]

Buy a new scope.