Icom IC-7850 Instruction Manual - Page 267

Previous view 20 CONNECTOR INFORMATION ■■Microphone connector (Front panel view) q Microphone input i AF output (MAIN band) u GND (Microphone ground) w +8 V DC output y GND (PTT ground) e Frequency up/down t PTT r Squelch switch (MAIN band) 8 V DC is applied to pin 1 for microphone operation. You can turned OFF if it is not necessary with an item "MIC Input DC Bias" on the Set mode. (p. 15-16) The circuit is used to output memory information in 4-channel memories. You can output desired memory information such as that from a CW Memory keyer, Voice memory, RTTY/PSK Memory to be transmitted. Push a switch to send the memory information. Hold down the switch for one second to repeatedly send the memory information. When you connect the external keypad, turn ON the following items in the Other set mode. (p. 15-16) (SET [F-7] > OTHERS[F-5]) • External Keypad (Voice) • External Keypad (Keyer) • External Keypad (RTTY) • External Keypad (PSK) NOTE: You cannot transmit the CW memory keyer and Voice memory from T5 to T8, the RTTY memory from RT5 to RT8, or the PSK memory from PT5 to PT8. PIN No. DESCRIPTION q Microphone input (Impedance: 600 Ω) w +8 V DC output （Max. 10 mA） e Up: Ground Down: Ground through 470 Ω r "Low" level when the squelch opens. t PTT y PTT ground u Microphone ground i AF output (varies with [AF]) 4.7kø 2.2kø 1.5kø 1.5kø ±5% ±5% ±5% ±5% S4 S3 S2 S1 External Keypad PINe [MIC] connector MIC PINy 1 7 286 34 5 (Front view) ■■[ELEC-KEY] jack Connect to a CW paddle. You can change the paddle activation with item [Keyer Type] on the [KEYER CW-KEY] screen. ([KEYER [F-3]) > [EXIT/SET] > CW KEY [F-4] > Keyer Type) (dot) (com) (dash) ■■[KEY] jack Connect to a CW straight key or the output of an external electronic keyer. B L _ + 20-3