On Nov 23, 2009, at 8:16 PM, Ross Primrose wrote: > Couldn't you just change the component values to raise the lower LPF > to > say, 16MHz, and run 30m & 20m through the lower filter, and 17m & 15m > through the existing higher LPF?
Probably, though I haven't tried it. Our original intent was to cover 40 m as well. 73, Wayne N6KR > > 73, Ross N4RP > > Don Wilhelm wrote: >> Curt, >> >> Not practical. Yes, that might work, but you would need to design >> your >> own board (or highly modify the KFL1-4 board). >> The reason is in the Low Pass filters - there are only 2 - the >> board is >> wired for 2 bands to use the lower frequency LPF and two more bands >> use >> the higher LPF. The lower band LPF has a cutoff somewhere near 11 >> MHz. >> The lower 2 bands use this LPF. So the lowest low band must be >> higher >> than 1/2 the cutoff frequency - and in ham band language, that >> means 40 >> and 30 are a good pair. The higher band(s) Low Pass filter cutoff is >> just above the 15 meter band, so it is usable for any bands between >> about 12 MHz and 22 MHz - that means any two of 20, 17 and 15 meters. >> are the possibilities, but the board is wired so only 2 of these >> bands >> can be used. >> >> You might want to consider a 4 band board plus an additional 2 band >> board - say for 80 and 17, and configure the 4 band board for 40, >> 30 and >> 20,15m. That would give you coverage from 80 thru 15 meters with a >> filter board swap. >> >> 73, >> Don W3FPR >> >> [email protected] wrote: >> >>> Since the KFL1-4 module allows either 17 or 15 selected at build >>> time, I'm wondering whether building say ??,20,17&15 (leaving out >>> 30M or 40M)is workable. It seems to me that this ought to work >>> fine. With sunspot count increasing, am wishing for 4 band module >>> more focused to the higher bands. >>> >>> I personally find the K1 a really enjoyable little QRP rig to use, >>> and have a bunch of gear dwarfing it's diminuative size sitting >>> idle on the desk. I actually like using XIT on the K1 better >>> than using split on my QRO rigs for working DX. Recently have had >>> VK2, EA1, E51, 5N0, CT9, KL7, and GA5 QSOs with 3 watts on 17 and >>> 15. It would be nice to not need to change filters to QSO both of >>> these bands. >>> >>> 73, Curt KB5JO >>> >>> >>> >> ______________________________________________________________ >> 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 >> > > > -- > FCC Section 97.313(a) “At all times, an amateur station must use the > minimum transmitter power necessary to carry out the desired > communications.” > > ______________________________________________________________ > 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 ______________________________________________________________ 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
