Kantronics KPC-2 - Page 27

KPC-2400 - AFSK Output - Jumper 1
This jumper is provided to alter the AFSK output level. The KPC-2400 is shipped with
this jumper in the high position. In the high position output level is 44 mV P/P (open
circuit, 600 ohms nominal). In the low position output is 10 mV P/P. If a higher output
level is required for your radio it may be obtained by changing R32. The chart below
gives the output levels (open circuit) for different values of R32 with the jumper in the
HI position.
R32 value AFSK level
100 ohm 4.5 mV
220 ohm 10mV
470 ohm 21mV
1K 44 mV
15K 65 mV
22K 94 mV
8.2K 298 mV
Should you require a still higher AFSK output level the value of R32 may be increased
further to provide incremental increases in the same approximate ratio as that shown
in the table. For maximum output level the HI LO jumper can be removed entirely. In
this case AFSK output level will be approximately 1.5 volts peak-to-peak.
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1989,
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