There is a ton of great info showing up here. I love it....

In my experience RF does not "go away" because PCM is used, RF will get worse and eventually PCM and the 2.4Ghx stuff will not overcome it.

The PCM issue I have been aware of for a long time but just a few weeks ago I experienced loclout on the DX7. At first I blamed it on the TX because I'm on my 4th one because the screens were going blank and I was loosing control intermittently on more than one plane.

Well one day I was flying my well flown Cap with the DX& and loving life. I had just installed a Brison 3.2 in place of the well run in DA50 so that it could be sent off for service and 2 flights later I was getting intermittent lockouts. At first I thought the TX again but it got worse and worse and I did get the plane back in one piece. I got home all disgusted to find the plug had worked loose because during the install I only made it finger tight, yep my bad. The engine would still run but OH man the RF it was putting out was incredible

My point is given even time, RF will get worse, my example is extreme but is something that can happen. Until I started on the DX7 and even to this day using my 10x on my bigger stuff, I will test fly several flights as well as doing multiple range checks using PPM first. If I get RF (poor range checks) then I find the problem and fix it. 2.4 stuff does a very nice job of filtering as does PCM but it can only do so much.

Never use PCM to compensate for a RF issue, it will bite you