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is there a way to annenuate the feed to the distribution amplifier from the hi-gain pre-amp so that the signal does not overdrive the distribution amp ?
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Sure is.
https://www.antennasdirect.com/store...ttenuator.html
Install it at the input of the distribution amp and you can dial down the signal if required.
Our distribution amplifiers, CDA4 (
https://www.antennasdirect.com/store...amplifier.html) and CDA8 (
https://www.antennasdirect.com/store...amplifier.html), can withstand very substantial signal levels without themselves going into distortion. Installing the attenuator at the amp's input is a prudent safeguard against overload, though.
Here's an generic drawing showing how such an arrangement might be set up. The variable attenuator would go between the preamp's power inserter and the input of the distribution amp:
https://www.antennasdirect.com/cmss_...bution_Amp.pdf
It is very possible that the problem is something other than the raw signal power, the main thing that an amp will address, so be aware of that potential.