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I have 2-? c2037 multicouplers and I see in the manuals that the insertion loss can be adjusted. what is the consequence of reducing insertion loss from 3db to something lower. Has anyone attempted this?

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https://www.repeater-builder.com/antenna/sinclair/fp-fr-fq-series-tuning.pdf

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thanks? Tom

Look at the insertion loss curves to see what the rejection to other frequencies are and the required isolation required for duplex operation. For 600khz rx to tx split, depending on the radios used, it can’t be lowered without degradation and still may need 1 Q (pass/reject) cavity added between the last pass can and radio.?

These curves for the c2037.?

note, the expanded passband has frequency error in the scale except for the 0.1 value.?