Nigel G4ZAL did Howard WB2VXW ‘s mod by adding:
- 27uH inductor in series with R86 (NB calculated value)
- Adding parallel caps of 220pF on top of R87 and R88.
The mods to the main board are shown in the photo below.
The power output changes that resulted were as follows:
- 7MHz from 12.5w to 14.5w
- 14MHz from 7w to 11.5w
- 21MHz from 4w to 8w
- 28MHz from 2w to 4w
Nigel says it is a “very worthwhile mod for just 3 components”. This mod is something that all constructors should consider.