Specifications

6. Press the "K" key on the keyboard to key the transmitter. You
should hear a continuous tone in the monitor receiver.
7. Tap the space bar several times until the higher pitched of the
two tones ("Space") is heard.
8. Refer to the figure below of the PK-900's rear panel and locate
the AFSK TX level potentiometer adjustment for the radio port you
are calibrating.
Figure 3-6 PK-900 Rear Panel AFSK TX level Controls
9. With the PK-900 keying the transmitter and sending the higher
of the two tones, adjust the transmit audio level for the port
you are calibrating as follows:
o Listen to the monitor receiver; turn the PK-900's rear-
panel AFSK Output Level adjustment screw clockwise (CW)
until you hear no increase in output level in the receiver.
o Rotate the AFSK Output Level adjustment screw
counterclockwise (CCW) until the audio signal on the
monitoring receiver is slightly but noticeably reduced from
the maximum level. This is the proper AFSK level setting.
NOTE: If you find the "correct" AFSK level setting occurs in the
first 20% of the potentiometers range, the adjustment may
be difficult. If you find this adjustment difficult, the
internal AFSK level jumper may be moved to the LOW setting
which will improve the adjustment range of the potentiometer.
To locate the internal AFSK level jumpers in the PK-900,
remove the four screws that secure the top chassis, and
carefully remove it by lifting straight up.
Look for jumpers JP5 and JP6 near the radio port connectors
at the rear of the PK-900 as shown in figure 3-7 below.
Jumper JP6 controls the output level of radio port 1, and
jumper JP5 controls the output level of port 2. When the
jumper is towards the front, the output level is HIGH.
Move the jumper for the radio port being adjusted to the
rear two pins to set the AFSK output level to LOWer range.
Repeat step 9 when this has been completed.
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