Icom IC-7100 Advanced Instructions - Page 39
Connecting a non-Icom linear amplifier, WARNING - with external amplifier
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Previous view 2 INSTALLATION AND CONNECTIONS Linear Amplifier Connections (Continued) DDConnecting a non-Icom linear amplifier To connect a non-Icom HF, 50/70*1 MHz bands linear amplifier, see the diagram below. *1 70 MHz band transmission is available, depending on the transceiver version. To an antenna Non-Icom Linear amplifier [ANT1]*2 RF OUT RF IN ALC SEND Relay Switching diode ALC (Blue) HSEND (Orange) /VSEND GND IC-7100 ACC 13.8 V (Gray) 13-pin plug with ACC cable RWARNING! *2 When connecting a 144 MHz or 430 MHz band's liner amplifier, connect to [ANT2]. The SEND terminal of the linear amplifier must be connected to the HSEND (ACC connector pin 3) for the HF, 50/70* MHz bands, and to VSEND (ACC connector pin 7) for the 144/430 MHz bands. An external relay must be used. * 70 MHz band transmission is available, depending on the transceiver version. When the HSEND (or VSEND) terminal controls the inductive load (such as a relay), a counter-electromotive force can damage or cause the transceiver to malfunction. To prevent this, add a switching diode on the load side of the circuit to the counter-electromotive force absorption. • We recommend adding a switching diode, such as an "1SS133". • W hen the diode is added, a switching delay of the relay may occur. Be sure to check its switching action before operating. The ALC input level must be in the range 0 V to -4 V. The transceiver does not accept positive voltage. Non-matched ALC and RF power settings could cause a fire or damage the linear amplifier. When using a linear amplifier such as IC-PW1/EURO, adjust the output power to stay within the ALC zone by pushing MIC/RF PWR (C). For ALC zone information, refer to 'Basic transmit operation.' (p. 3-23) When using a linear amplifier that has a time delay between receiving and transmitting, a high SWR might cause the linear amplifier to malfunction. To prevent this, slow the TX Delay the "TX Delay" settings in the "Function" Set mode. (p. 17-19) SET(C) > Function > TX Delay Left Display Center Right The L, R, C or D in the instructions indicate the part of the controller. L: Left side R: Right side C: Center bottom D: Display (Touch screen) 2-11