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If you still get the overloading/cross modulation then the loop amplifier is the problem - no amount of filtering or radio gain reduction will get rid of it.
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As I said, if the cross-modulation is taking place in the loop amplifier, no amount of attenuation subsequent is going to get rid of it.
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It was connected to the ATU and Attenuator, 10dB, 20dB, 30dB and 40dB. It just got quiet, but the overloading signals are still there, not going away.
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