Kantronics KPC-2 - KPC-2400 - AFSK Output

AFSK OUTPUT LEVEL
17
KPC-2400 – AFSK Ouput – Jumper K1
This jumper is provided to alter the AFSK output level. The KPC-2400 is shipped with the jumper in
the HI position. In the HI position output level is 44 mVpp (open circuit, 600 Ω nominal). In the LO
position output is 10 mVpp. 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 Ω
220 Ω
470 Ω
1 kΩ
1.5 kΩ
2.2 kΩ
8.2 kΩ
4.5 mV
10 mV
21 mV
44 mV
65 mV
94 mV
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 maxi-
mum output level the HI LO jumper can be removed entirely. In this case, AFSK output level will
be approximately 1.5 Vpp.