[Elecraft] KBPF3 100-400 kHz Modification

[Joe Subich, W4TV]

 > If the KBPF3 modification compromises performance elsewhere in the
 > coverage, I might be better off using my current approach:  A
 > home-brew transverter for 630m coverage with a 10.0 - 10.5 MHz IF
 > with home-brew sharp cut off low pass filter ahead of the RF input.

The KBPF3 modification impacts only the 0.5-2.0 MHz section of the
BPF3.  In essence that section of the filter is converted from an
0.5 - 2.0 MHz BPF to a 0.1 - 2.0 MHz BPF.  IIRC when I modeled the
modification with filter design software, the behavior above 1 MHz
showed little or no change while the low frequency response was
substantially better between 100 and 500 KHz.

73,

   ... Joe, W4TV


On 12/27/2015 4:02 PM, Michael Mussler wrote:
> I am considering the Elecraft modification to the KBPF3 for 630m coverage on my K3. Is there any information published on the band pass filter performance before and after the modification?
>
> If the KBPF3 modification compromises performance elsewhere in the coverage, I might be better off using my current approach:  A home-brew transverter for 630m coverage with a 10.0 - 10.5 MHz IF with home-brew sharp cut off low pass filter ahead of the RF input.
>
> Mike, AI8Z
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