Icom IC-718 Instruction Manual - Page 10
Microphone HM-36
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2 PANEL DESCRIPTION s Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. • Continuous pushing changes the frequency or memory channel number continuously. • The [UP]/[DN] switch can simulate a key paddle. Preset in the CW PADDL in initial set mode. (p. 31) w PTT SWITCH Push and hold to transmit; release to receive. • MICROPHONE CONNECTOR (Front view) q Microphone input w +8 V DC output e Frequency up/down i Main readout AF output (varies with [AF]/[BAL]) u GND (Microphone ground) y GND (PTT ground) t PTT r Main readout squelch switch [MIC] PIN NO. w FUNCTION +8 V DC output Frequency up e Frequency down Squelch open r Squelch closed DESCRIPTION Max. 10 mA Ground Ground through 470 Ω "LOW" level "HIGH" level CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. • HM-36 SCHEMATIC DIAGRAM MICROPHONE MICROPHONE CABLE MICROPHONE PLUG MIC ELEMENT + 10µ 2k 4700p + 0.33µ 4700p DOWN UP qu wiy ert PTT RECEIVE 470 TRANSMIT 8