[Elecraft] KBPF3A and KBPF3B

[Lyle Johnson]

Ted,

The discrepancies in instructions are due to the KPBF3A instructions 
being written with the K3S in mind, while the KBPF3 mod instructions 
were written with K3 in mind.

If a KBPF3A, or a modified KBPF3, is installed into a K3, the RF board 
(or KRX3 main board) bypasses must be done for good low frequency 
performance.  If the KPBF3A, or a modified KBPF3, is installed into a 
K3S the RF board modifications are not necessary because the K3S RF 
board has the changes already incorporated.

The instructions will be corrected by errata and eventual updating.

Meanwhile, the physics remain the same: the K3 RF board needs the mods 
for good LF reception with the KPBF3A or modified KBPF3.

73,

Lyle KK7P

> A further question about this . . . Having just read the installation
> instructions for both the KBPF3A and for the mod kit for the old KBPF3, I
> note one difference.  The mod kit requires SM work on both the existing
> KBPF board and soldering on the RF board itself.  The new KBPF3A
> instructions make no mention of any changes to the RF board.  Does that
> mean that by replacing the KBPF3 entirely there is no need to also modify
> the RF board?