* * * VALUE L1-L2 TX136 * * *

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* * * VALUE L1-L2 TX136 * * *

Postby F6CWA » 02 Apr 2020 14:17

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

Postby OH7SV » 02 Apr 2020 15:17

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

Postby F6CWA » 02 Apr 2020 18:07

Matti
thanks, i checked the signal on pin 14
bad solder :( . now the converter works well.
73 Hubert
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Re: * * * VALUE L1-L2 TX136 * * *

Postby OH7SV » 02 Apr 2020 19:49

Very good Hubert,

Enjoy using your JUMA TX136.
Stay safe!

73 Matti OH7SV
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