Not without a display to tell me where I am in the sequence - plus I already have a 2P6T rotary switch. But I'm open to any ideas.
73, Pete At 05:24 PM 5/9/2008, you wrote: >Wouldn't be easier to have Band Up and Band Down momentary buttons? > >----- Original Message ----- >From: "k5nwa" <[EMAIL PROTECTED]> >To: <[email protected]> >Sent: Friday, May 09, 2008 4:10 PM >Subject: Re: [softrock40] Encoding for Xtall > > > > 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 > > > > > > > > >------------------------------------ > >Yahoo! Groups Links > > >
