Kantronics KPC–3 Plus User Manual page 52

Now the receive volume control on your transceiver is properly adjusted for sending
signals to your KPC-3 Plus.
Your KPC-3 Plus is now installed and ready to use. You may now go to the ―Getting
Started‖ chapter, to learn how to do the basic operations with your KPC-3 Plus.
If you do not see the receive LED light, check the cabling between the radio and the
KPC-3 Plus. Also, until it has been initialized from the computer, the KPC-3 Plus will not
show ANY indication of receiving.
If you connected to a fixed level (unsquelched) receive audio from the radio, the receive
LED may remain on all of the time. In this case, set the parameter CD to SOFTWARE.
Then, the receive LED will not light until valid packets are heard. (see CD in the
commands section)
Transmit level adjustment
The 1200-baud data drive level (transmit audio voltage, TXA) from the KPC-3 Plus to
your radio is adjusted digitally, using your keyboard and the transmit level (XMITLVL) or
the calibrate (CAL) command. Previous models used a set of jumpers and an analog
potentiometer (pot) to set this level. With the KPC-3 Plus, no jumpers are used, just a
command.
You should adjust the drive level to provide about 3 to 3.5 kHz of deviation with your
radio. If you don't have access to a deviation meter, adjust drive so your packet
transmissions generate about the same audio sound as packets heard from other
stations.
The XMITLVL command has a parameter default value of 100; this corresponds to a
drive voltage of about 50 mV. You may change this level by increasing the
parameter/count. For counts below 256, the voltage is increased in 0.5 mV steps; above
that, the drive increases roughly 15 mV per step.
For details, see the description of the XMITLVL command in the ―Command
Reference.‖
Alternatively, you may use the calibrate command (CAL) which has a zoom feature; that
is, you can hold down the ‗-' or ‗+' key to decrease or increase the voltage (as you watch
a meter or listen). See the commands section for more detail on these commands. CAL
is not available in the NEWUSER mode; you must be in TERMINAL mode to access
CAL.
The next section of this chapter is for those who wish to connect a GPS device to their
KPC-3 Plus. Skip this section if it does not apply to you.
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