Icom IC-7700 Instruction Manual - Page 37

2 INSTALLATION AND CONNECTIONS ■ Accessory connector information ACC 1 2 45 183 67 PIN No. NAME DESCRIPTION 1 RTTY Controls RTTY keying SPECIFICATIONS "High" level "Low" level Output current : More than 2.4 V : Less than 0.6 V : Less than 2 mA 2 GND Connects to ground. Connected in parallel with ACC 2 pin 2. 3 Input/output pin. SEND Goes to ground when transmitting. When grounded, transmits. Ground level : -0.5 V to 0.8 V Output current : Less than 20 mA Input current (Tx) : Less than 200 mA Connected in parallel with ACC 2 pin 3. 4 MOD Modulator input. Connects to a modulator. Input impedance : 10 kΩ Input level : Approx. 100 mV rms 5 AF AF detector output. Fixed, regardless of [AF] position in default settings. (see notes below) Output Output impedance level : 4.7 kΩ : 100-300 mV rms 6 SQLS Squelch output. Goes to ground when squelch opens. SQL open SQL closed : Less than 0.3 V/5 mA : More than 6.0 V/100 µA 7 13.8 V 13.8 V output when power is ON. Output current : Max. 1 A Connected in parallel with ACC 2 pin 7. 8 ALC ALC voltage input. Control voltage : -4 V to 0 V Input impedance : More than 10 kΩ Connected in parallel with ACC 2 pin 5. ACC 2 2 45 1 3 67 PIN No. NAME DESCRIPTION 1 8 V Regulated 8 V output. SPECIFICATIONS Output voltage Output current : 8 V ±0.3 V : Less than 10 mA 2 GND Same as ACC 1 pin 2. 3 SEND Same as ACC 1 pin 3. 4 BAND Band voltage output. (Varies with amateur band) Output voltage : 0 to 8.0 V 5 ALC Same as ACC 1 pin 8. 6 TRV Activates [X-VERTER] input/output Input impedance when "HIGH" voltage is applied. Input voltage : More than 10 kΩ : 2 to 13.8 V 7 13.8 V Same as ACC 1 pin 7. NOTE: If the CW side tone level limit or beep level limit is in use, the CW side tone or beep tone decreases from the fixed level when the [AF] control is rotated above a specified level. (p. 12-6) 2-11