Icom IC-7100 Advanced Instructions - Page 31
Antenna connection, Antenna SWR
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Previous view 2 INSTALLATION AND CONNECTIONS Antenna connection For radio communications, the antenna is of critical importance, along with output power and receiver sensitivity. Select a well-matched 50 ø antenna and coaxial cable feedline. We recommend 1.5:1 or better Voltage Standing Wave Ratio (VSWR) on your operating bands. The transmission line should be a coaxial cable. When using a single antenna (for the HF, 50/70 MHz bands), use the [ANT1] connector. CAUTION: Protect your transceiver from lightning by using a lightning arrestor. Antenna SWR Each antenna is tuned for a specified frequency range, and the SWR usually increases outside the range. When the SWR is higher than approximately 2.0:1, the transceiver automatically reduces the transmit power to protect the final transistors. In that case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting. The IC-7100 has an SWR meter to continuously monitor the antenna SWR. Antenna connection Connect the cable from your HF, 50/70 MHz antenna to the [ANT 1] connector. Connect the cable from your 144/430 MHz antenna to the [ANT 2] connector. Installation example Bumper type PL-259 CONNECTOR INSTALLATION EXAMPLE q Coupling ring 30 mm 10 mm (Tin) Slide the coupling ring down. Strip the cable jacket and tin the shield. w 10 mm Tin Strip the cable as shown at the left. Tin the center conductor. 1-2 mm e solder solder Slide the connector body on and solder it. r Screw the coupling ring onto the connector body. (30 mm 9⁄8 in 10 mm 3⁄8 in 1-2 mm 1⁄16 in) 2-3