Icom IC-7700 Instruction Manual - Page 36
Microphone connector information, Microphones
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2 INSTALLATION AND CONNECTIONS ■ Microphone connector information (Front panel view) q Microphone input w +8 V DC output e Frequency up/down i AF output (varies with [AF]) u GND (Microphone ground) y GND (PTT ground) t PTT r Squelch switch [MIC] Pin No. FUNCTION w +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. DC voltage is applied to pin 1 for microphone operation. Use caution when using a non-Icom microphone. ■ Microphones (options) D SM-20 q w e D HM-36 q q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. • Pressing a switch continuously changes the frequency or memory channel number continuously. • While pushing [XFC], the transmit readout frequency can be controlled while in split frequency operation. • The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode. (p. 4-12) w PTT SWITCH Push and hold to transmit; release to receive. e PTT LOCK SWITCH (available for SM-20 only) Push to toggle between transmit and receive. w 2-10