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AR1000.2
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1992-09-15
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ar1000.2
* My comments :
DO NOT TRY THIS BY YOURSELF IF YOU DON'T FEEL CONFIDENT ABOUT
USING A SOLDERING IRON ON SUCH A MINIATURIZED DEVICE !!!
DON'T FORGET THAT, IF YOU FAIL, THE WARRANTY WILL BE VOID !!!
Now, let's relax. From the programming procedure, it is obvious
that you enter 7 sub-bands in the unit :
8 to 49.995 MHz
50 to 107.995 MHz
108 to 169.995 MHz
170 to 296.995 MHz
297 to 600.000 MHz
805 to 1109.995 MHz
1110 to 1300.000 MHz
These are the values for the AR-1000 as sold in France. The values
may be different for the units sold in Northern America (there may
be other gaps, especially for cellular phone frequencies).
I don't know what the following parameters (561.225 and 251.575)
mean. I guess they indicate which RF subcircuit, which step, and
which modulation mode to use. Anyway, since the sub-bands limits
appear so clearly, it might be fun to experiment. See what I mean ?
But, if we are to experiment, let's make things easier. Instead of
dismounting-soldering-programming-unsoldering-mounting the unit each
time, let's solder a 5" piece of wrapping wire to point (A),
a 5" piece of wrapping wire to point (B). Now we have 2 free ends :
let's solder a microswitch to them. We can glue the microswitch at
the bottom end of the unit, near the power supply board. Resetting
the AR-1000 is now much simpler : just open the unit (4 screws),
flip the switch, turn the unit on, reprogram it, turn it off, flip
the switch back, close the unit.
continued in ar1000.3