6
2.Mic Sel. Switch: Switches between two front panel microphones. Each
microphone can have up to 7 audio/control wires. The Mic+ and PTT are independently
switched but the other wires (Mic-, FCN1, etc.) are common to both microphones. As
shown in the drawing, the microphones can have different connector types. Instructions
for wiring the microphone jacks are given in the next section:
B. Assembly
Instructions.
3. Key Jack: A key or paddle is connected to this standard 1/4” stereo jack, with
normally open contacts. Keyer paddles should be wired so that the plug tip = dot, and the
plug ring = dash. For convenience, an identical key jack on the rear panel is wired in
parallel with this jack.
4. TX/RX Sel. Switches (3): Depressing one of these momentary action switches
selects a station transceiver or receiver/transmitter pair.
5. Amplifier Sel. Switches (3): Depressing one of these momentary action
switches selects a linear amplifier. Pressing a switch a second time toggles the selected
amplifier off-line, as indicated by a blinking LED and “Amp Bypass” on the LCD.
6. Elapsed Time Switch: This switch has three timer functions: (1) Depressing it
momentarily starts a one-time 10min ID time. (2) Depressing it for 1/2 sec starts a
repeating 10 min. ID timer. (3) Depressing it while turning on the Pwr switch causes an
elapsed time “odometer” to display on the LCD.
7. Swap Switch: This “scratchpad” memory switch recalls the previous
transceiver and amplifier selections. Repeatedly pressing the switch toggles back and
forth between the current transceiver/amplifier selections and the previous selections.
8. Amp Tune Switch: Depressing this momentary action switch injects a pulsed
(50% duty cycle) 1000 Hz tone into the microphone audio circuit of the selected
transceiver. Pressing the switch again turns off the tone, which otherwise will time out
after ten seconds.
9. Phones jacks (2): Twin stereo headphone jacks can accommodate either 1/4 in.
or 3.5 mm (1/8”) stereo headphones (Left = tip, Right = ring). These jacks are connected
to the left/mainRX and right/subRX speaker outputs of the selected transceiver; plugging
in a set of headphones automatically disables the speakers.
