I have received a PM from Ludwig @DH8WN sharing his experiences. I can also share it if he is fine with it?
Basically the compressor seams sensitive to stray RF. So a Commom Mode Choke in the antenna coax seams to be recommended.
Ludwig described that in some cases it was no problem i.e. with a 20m band vertical but an asymetrical dipole tuned with a ATU was causing the compressor to cause modulation problems.
He recommends the lowest compression setting to be enough.
When using an external amplifier the problem seams to increase.
We were discussing if a ferrite choke in the cable between 817 and compressor would make even more sense.
It shound be a relatively easy to replace that 8-pin RJ45 cable with another cable adding a ferrites. A normal network patch cable 1:1 should work fine.
So it seams like some tests are needed.
Ed we have a bad skip distance on 20 and 40m as it seams. But to EA it should be perfect.