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* * * VALUE L1-L2 TX136 * * *

PostPosted: 02 Apr 2020 14:17
by F6CWA
Hello
I have a question about the value of L1 and L2 of the TX136KHZ
on the circuit it is marked L1 and L2 680n (0.68uH) ??
TX is ok but 10mHz transverter no ok I replace IC2 no change .
HUBERT

Re: * * * VALUE L1-L2 TX136 * * *

PostPosted: 02 Apr 2020 15:17
by OH7SV
Hubert,

The value 680nH is correct. L1, L2 and C11 forms a 12MHz LPF filter to attenuate harmonics coming from the mixer IC2.
Check first that the 10MHz square wave (CLK/2) is coming to IC2 pin 14.

Matti OH7SV

Re: * * * VALUE L1-L2 TX136 * * *

PostPosted: 02 Apr 2020 18:07
by F6CWA
Matti
thanks, i checked the signal on pin 14
bad solder :( . now the converter works well.
73 Hubert

Re: * * * VALUE L1-L2 TX136 * * *

PostPosted: 02 Apr 2020 19:49
by OH7SV
Very good Hubert,

Enjoy using your JUMA TX136.
Stay safe!

73 Matti OH7SV