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."
>
>
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>
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>
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