[Elecraft] Installing KBPF3MDKT MOD FOR LOW FREQ CUTOFF

[Don Wilhelm]

The KBPF3A extends the low frequency that the bandpass filter can go. 
However, the K3 without the new synthesizers cannot tune that low.

So if you want to get to the low frequency bands, you need both.

You certainly can put the mod kit on the KBPF3, but you cannot take 
advantage of the extended low range unless you upgrade the synthesizer.
The synth change is not required unless you want the extended range.

73,
Don W3FPR

On 12/9/2018 12:10 PM, ke9uw wrote:
> The Elecraft site states the new Synthesizer KSYN3A is required to modify the
> original KBPF3 to KBPF3A specifications.
> However, Fred Cady's book, "Upgrading the Elecraft K3 with K3s Components"
> does not make this requirement for the KBPF3 to 3A modification.
> 
> Why does Elecraft require the KSYN3A and Fred Cady not require it for this
> band pass filter mod?
> Anybody have insight on this?
>