PK-232 MBX Operating Manual - N3UJJ

3.4 PK-232 Configuration Jumpers and Connections
Before operating the PK-232, you must first make sure it is correctly
configured for your radio's PTT. After this has been checked you
should then connect the cables you constructed in the above steps.
3.4.1 Push-To-Talk (PTT) Configuration
Before you connect the Radio cable(s) you just made to the PK-232,
consult your transceiver's manual for Push-To-Talk keying polarity.
Most transmitters and transceivers made in the last 15 years use
Positive PTT keying. However some gear, especially if it contains
vacuum tubes, may use a negative PTT keying voltage.
The PK-232 is configured for positive PTT at the factory so it will
operate with most equipment without changes. However, if necessary,
you can change the polarity of the PTT configuration on either or both
RADIO1 and RADIO2 ports. Follow these steps:
o
o
o
o
Remove four screws from the sides and two screws from the rear
of the PK-232 chassis cover and lift off the cover.
Locate Jumper posts JMP2 and JMP3 which are near the
RADIO1/RADIO2 switch SW2.
JMP2 configures the RADIO1 port and JMP3 configures RADIO2.
When the shorting jumper is towards the front, the port is
configured for Positive (+) PTT. When the shorting jumper is
towards the rear, the port is configured for Negative (-) PTT.
NOTE:
This is especially useful if you want to configure one
radio port for positive PTT and the other for negative PTT.
Replace the cover and six screws when you are finished configuring the
polarity of the PK-232 PTT circuit.
3.4.2 PK-232 Connections
Remove power from the PK-232, your transceiver and all accessories
before making any connections.
Connect the Radio Cable(s) you constructed in section 3.3.5 between a
Radio port on the PK-232 and your transceiver(s).
IMPORTANT NOTE
MAKE SURE THAT THE RADIO CABLES EXIT "DOWNWARD" FROM THE TWO RADIO
JACKS ON THE REAR PANEL. ALTHOUGH NO DAMAGE WILL OCCUR FROM REVERSE
CONNECTION, YOUR PK-232 AND RADIO WILL NOT OPERATE CORRECTLY!
If you wired cables for CW keying, Direct FSK or an Oscilloscope then
connect these to the appropriate point on your equipment.
4/91 3-8
From The N3UJJ.COM Document Library