It sure does, Cecil. That looks much better than anything I had thought of so far. I think the PICs in the current run of 8.3+Xtall kits are programmed with V. 2.4 software, but I'm sure the V. 2.5 option will be available soon.
Thanks for the great info. 73, Pete At 05:10 PM 5/9/2008, you wrote: >At 03:10 PM 5/9/2008, you wrote: > > >Sorry, Cecil, that's a bit too brief for me. Sorry, but I barely speak > >english - BCD and binary don't come very naturally. The code I need for 28 > >MHx, for example, is 1101. How does what you describe produce that? > > > >73, Pete N4ZR > >The crystal board with V2.5 software uses 4 bit switch to select the >group and individual frequency within the previously selected group, >so some bits do double duty. > >When bit 3 is active it makes the software look a bits 0,1,2 as band >setting switches, it then remember the group you have selected until >you change it again by pushing on the button connected to bit 3. When >the button on bit 3 is not pushed the PIC looks at switches 0,1,2 as >bits that determine which of eight possible frequencies in the >previously select group is active. > >Bit 3 determines if the other three bits (0 through 7) represents >frequency or group information so typical use is as follows; > >You rotate your switch to the group of choice (groups 0 through 7) >You push the button that is hooked to bit 3 of the PIC then you let >it go, that sets the group of frequencies, and the PIC remembers it. >Now you can use the rotary switch to select one of eight frequencies >in that group, with this scheme if you had enough free EEPROM you >could implement 64 frequencies, or 8 groups with eight choices each. > >So with a 74HC147 you would have some kind of rotary switch pick >positions 0 through 7, the output of the 74HC147 is connected to bits >0, 1, and 2 of the PIC, you would also have a push button hooked up >to bit 3 of the PIC. > >If however you are going to re-program the PIC then all bets are off >and the scheme will be whatever you choose, but the above scheme is >pretty flexible and gives you lot's of choices and it's already >programmed in the device. > >I hope that makes it clear. > > > >Cecil >K5NWA >www.softrockradio.org www.qrpradio.com > >"Blessed are the cracked, for they shall let in the light." > > >------------------------------------ > >Yahoo! Groups Links > > >
