> 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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