KFL1-4 Options Question
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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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 [hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KFL1-4 Options Question
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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? 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 > > [hidden email] 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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 >> >> [hidden email] 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:[hidden email] >> >> 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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