Rear Panel - microHAM DigiKeyer Manual

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REAR PANEL

All connectors for connecting the computer, radio and accessories are located on the rear panel.
(1) – PA PTT: PTT output for Power Amplifier
Ground during transmit
TIP - Signal
SHELL - Ground
(2) - LNA PTT: Control output for Low Noise Amplifier
Ground during transmit
TIP - Signal
SHELL - Ground
If the jumper is in SS position, open collector switching
transistor is connected to the PAPTT or LNAPTT output jack.
The transistor can switch up to 48V @ .8A. This position is
appropriate for modern Power Amplifiers with electronic
keying and LNA bypass relays .
Check manual of your PA and LNA to be sure the power requirements do not exceed the transistor rating
otherwise set the appropriate 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: If you are not sure about keying voltage of your amp on LNA, use the RE position.
(3) - RADIO: DB15F connector for radio interconnection – a detailed description is in Appendix A
(4) - REM: MiniDIN6 for PS/2 keyboard or numeric keypad.
(5) - USB: USB B connector for computer connection. Connect the supplied USB A-B cable.
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