Rear Panel - microHAM Digi Keyer II Instruction Manual

All connectors for connecting the computer, radio and accessories are located on the rear panel.
(1) RADIO: DB15F connector for radio interconnection – a detailed description is in Appendix A
(2) MIC: 3.5mm jack for microphone input from micro2R
(3) USB: USB B connector for computer connection. Connect the supplied USB A-B cable.
(4) SUB RX: 3.5mm jack for connecting audio from a second receiver
(5) PS/2: MiniDIN6 for PS/2 keyboard, PS/2 numeric keypad, resistive Keypad, or Aux CI-V output.
(6) PTTIN: RCA for PTT Out (Amplifier PTT) from transceiver.
(7) PA PTT: PTT output for Power Amplifier
Ground during transmit, TIP – Signal, SHELL - Ground
If the jumper is in the SS position, the switching transistor (open
collector) is connected to the PA PTT jack. The transistor can
switch up to 45V/0.8A. This position is appropriate for modern
Power Amplifiers with electronic keying. Check the manual of
your amplifier to be sure the power requirements do not exceed
the transistor rating. If the requirements exceed transistor rating
set the jumper to the RE position - this position connects the
relay contact to the output jack. Maximum rating for the relay is:
48V AC/DC @ 1A.
NOTE: The RE/SS labels are REVERSED in DIGI KEYER II.
The picture below shows jumpers in the RE position.
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REAR PANEL

TIP: If you are not sure about the keying voltage of your Power Amplifier or
LNA, use the RE position.
TIP: the RE/SS jumpers are located on the edge of the circuit board in front
of the PA PTT and LNA PTT jacks.
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