This was an interesting section to build. I found one 470 ohm resister to be missing. Turned out that the BOM listed one, which I had already installed, so could not figure out why I could not find it. Careful checking of the instructions revealed that there are actually two 470 ohm resisters in the kit, so I had to go scrounging through my junk box to locate a spare that I could use. The alternative was to ask Doug Hendricks to send me one (that would delay the build progress by at least 2 weeks) or travel to my nearest electronics supply store to purchase one. Luckily I located one in an old kit that was no longer used.
Once that stage was complete, it was time for the final testing. I hooked up a 7ah battery that was putting out 12.06v, then connected up a dummy load, an MFJ-860 SWR Wattmeter and a straight key. On key down, I saw around 2W on the wattmeter. This got me thinking.
How accurate is the wattmeter? I decided to get a handle on this before fiddling with the windings of L8, L10 or L12. So I hooked up my trusty DC40A (another Doug Hendricks kit) to the dummy load and my bigger MFJ-941E versa tuner. You see, I know this rig puts out 1W with 13.08v, so this would be a good reference point. Sure enough, I got 1W on the dial.
So now it was the turn of the PFR-3 with the MFJ-941E but with 12.06v. I was now more confident at fiddling with the coils to get a 5W reading. My rig was reading well over 5W now, so I played with the spacings of the coils until I received 5W output on all bands.
Next is to mount everything into the enclosure.