I got a great deal on a slightly used Yaesu FT-1000MP Mark V a few months ago and I finally got around to doing a couple of the standard modifications (mods) that other Hams said should be done.
I added the Inrad IF Noise Reduction Modification, and also the Main Receiver AF Filter Modification. Since I had the bottom cover of the FT-1000MP MK V off anyway, I added the Yaesu YF-114SN and YF-110SN 2.0 SSB filters while I was at it.
Here's the installed Inrad IF Noise Reduction Mod board (click to enlarge):
And the addition of a .047μF capacitor on the Main Receiver AF Filter Mod (click to enlarge):
And finally the installed Yaesu YF-114SN & YF110SN 2.0 Filters (click to enlarge):
So how does it work you ask? AWESOME!
The only change that I had different than the instructions was Inrad called for a 2 integer downward change in menu item 9.1 after the installation, but I found the rig audio sounded better with a 4 digit downward change (without reducing the inbound RF level). In my specific case, I dropped from 12 to a 8. Settings lower than 8 started attenuating the received audio signals, not just the hiss.
What a difference in received audio. With the IF Noise Reduction Mod, the normal "hiss" (noise floor) dropped substantially making the RF signals seem to "pop" and become stronger. With the Main Receiver AF Filter Mod, CW sounds easier to listen to without the high frequency tip of the CW tones.
All in all, two great relativity low cost mods. The only shame is you have to choose between the Inrad Roofing Filter Mod or the IF Noise Reduction Mod. You cannot do both - only one or the other. Total time to install both mods and the filter set was about one hour. The most time was getting the little capacitor in the Main Receiver AF Filter Mod situated and soldered in. My fingers are just too damned big for that little critter. There was a tiny bit of soldering on the IF Noise Reduction Mod too, but simple stuff.
As far as the 2.0 SSB filters, they do seem to work very well without significant loss of audio signal. Not that a half a kc matters in the big picture, but when faced with strong adjacent signals, every bit helps. I've heard from several ops that the Inrad 1.8 filters are just too tight and make the SSB signal hard to understand - that's why I added the Yaesu 2.0's. Better than stock 2.4's, but not too tight as to be worthless.
In a past Blog post, I wrote about my comparison between the FT-1000D and FT-1000MP MK V here. The MP MK V smoked the FT-1000D then, and that was BEFORE these mods and addition of filters.