> 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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