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Invert all bits:
Add 1:
Sum at '8' bit position, carry 1
Sum at '16' bit position, carry 1
Sum at '32' bit position, carry 1
Sum at '64' bit position, carry 1
Sum at '128', no carry needed
Final result:
SWITCHING
The 12 front panel switched channels, with never a need for a crystal will
cover most applications generously. Yet many of us will want to figure out
ways for easy frequency-programming of still more channels, especially if
we do a lot of cross-country travel. Rather than endorse or illustrate any
particular scheme, of which there are dozens if not hundreds, we provide
here the most basic schematic information needed to set up any kind of
auxiliary switching correctly. The principles and requirements remain the
same whether you use DIP switches, toggle or slide switches, electronic
latching or go all out to build the mother of all diode matrixes. Make sure
whatever you build resembles electrically the diagram on page 39.
Some DO's and DON'Ts of FX-Transceiver Add-Ons:
1. DO study and understand the basic switching diagram.
2. DO let your ingenuity run wild to come up with the neatest, most cost-
effective scheme.
3. Please DON'T ask our technicians to talk you through your own idea.
4. DON'T run switching cables across the VCO and Transmit RF side of the
PC board.
5. Please DO submit successful frequency control ideas as articles for your
favorite ham radio magazine. Your pay as author may cover the cost of your
transceiver!
6. Please DO mail or fax us your good ideas.
7. Please DON'T try out ANY modifications of the basic FX-Transceiver
unless you already have it WORKING fine.
NOTES:
1. DIP switches with diodes can be installed on/above the diode matrix
itself for E-Z internal programming changes.
1
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
0
1
1
1
0
1
1
1
+
1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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