So as @Ludwig_DH8WN pointed out, I checked the soldering of the L401, there were some toroid soldering points that were not making good contacts. After soldering them well, the measures are of around -10 to -18dB. Thanks to y'all for the help!?
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Now the unit works as expected I even managed to make a QSO with the new SSB firmware!?
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Thanks again for the help pointing out where to check!
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73 de EA4IIF.
