Transmit Drive level.
After entering the calibrate mode (CAL) you should use the T option to initiate
the transmission of a square wave and then adjust the AFSK drive level by press
-
ing the ‘-’ or ‘+’ key (and holding it down) until you achieve the drive level you
need.
For HF SSB operations (RTTY, PACTOR, etc), adjust drive until the ALC meter
level on your radio is full scale. For Packet operation on VHF, adjust deviation
to achieve about 3 to 3.5 kHz deviation from your radio.
+
When the deviation has been set, check the parameter value for XMTLVL and
make a note of that value for future reference.
Receive Equalization.
If you have another Kantronics user nearby, have that station transmit a calibrate
square wave and choose the R option in your calibrate mode to measure the sta-
tus of receive equalization. You will see two numbers displayed each time you
press R. The KAM’98 is measuring the space/mark square wave generated by the
other station. For best performance, these numbers should be about equal. A
40/60 to 60/40 ratio is acceptable. Change jumper J7 if need be. See the jumper
section for J7’s location/function. Default is no equalization since it is normally
not needed.
Note: If you are using a Low Impedance Data output from the radio (or external
Speaker output), set J10 on both pins (OFF = 10K, ON = 620 ohm).
PTT (Push-to-Talk) Watchdog Timer
The KAM’98 has a push-to-talk watchdog timer. This timer is enabled at the fac
-
tory with jumper J20 on just one post. If the KAM’98 attempts to keep your ra
-
dio transmitting continuously for over 2-1/2 minutes, the watchdog timer will
activate and release the PTT line to your radio.
To disable the Watchdog timer, connect the pins of J20 together.
PTT (Push-to-Talk) Watchdog Timer Appendix B: Advanced Information
KAM’98 v 8.3 337 User’s Guide
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