User manual ICOM IC-720A

[. . . ] These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna. [. . . ] 49) Push NB to turn the noise blanker ON or OFF. ·" " appears when the noise blanker is set to ON. Push and hold NB for 1 sec. to enter the noise blanker set mode, then rotate [DIAL] to adjust the threshold level, or the blank time. · Rotate [M-CH] to select an item. 39 RECEIVE AND TRANSMIT 4 D RTTY reverse mode Received characters are occasionally garbled when the receive signal is reversed between MARK and SPACE. This reversal can be caused by incorrect TNC connections, settings, commands, etc. To receive a reversed RTTY signal correctly, select RTTY-R (RTTY reverse) mode. to toggle between RTTY and RTTY-R modes. Normal Space Mark 170 Hz 2125 Hz BFO BFO Displayed freq. 2125 Hz NB V/M 1 1. 8 4 10 NR METER ANF A/B 2 = 3. 5 SPLIT 3 7 6 AGC 18 9 VOX 28 F-INP ENT BAND MW 5 M-CL 14 7 8 COMP21 SCAN 24 MODE TS RIT GENE P. AMP ATT M-CH/RIT . 0 MNF 50 TUNER FILTER SPCH SET Reverse Space Mark 170 Hz 1 2 3 4 5 6 7 Displayed freq. D Twin peak filter The twin peak filter changes the receive frequency response by boosting two particular frequencies (2125 and 2295 Hz) for better copying of desired RTTY signals. q Push MODE NB V/M 1 1. 8 NR METER ANF A/B 2 = 3. 5 SPLIT 3 7 6 AGC 18 9 VOX 28 F-INP ENT BAND 4 MW 10 5 M-CL 14 7 8 COMP21 SCAN 24 8 9 10 11 12 13 14 15 16 17 18 19 20 21 40 MODE TS RIT GENE P. AMP ATT M-CH/RIT . 0 MNF 50 TUNER FILTER to select RTTY mode. SPCH SET · After RTTY mode is selected, push and hold MODE for 1 sec. to toggle between RTTY and RTTY-R modes. [DIAL] [M-CH] w Push and hold M-CH/RIT for 1 sec. e Rotate [M-CH] to select "TPF", then rotate [DIAL] to select the twin peak filter function ON or OFF. · The received audio volume may become greater when the twin peak filter is turned ON. OFF (default) M-CH/RIT SET r Push to exit the quick set mode and return to normal operation. 4 RECEIVE AND TRANSMIT D RTTY decode set mode Set the RTTY key polarity, shift width and mark tone. q When RTTY (RTTY-R) mode is selected, push and hold M-CH/RIT for 1 sec. 53) Push VOX to turn the VOX function ON or OFF. ·" " appears when the VOX function is ON. Push and hold VOX for 1 sec. to enter the VOX set mode, then rotate [DIAL] to adjust the VOX gain, anti VOX gain or VOX delay. · Rotate [M-CH] to select an item. 19 20 21 42 4 RECEIVE AND TRANSMIT Data mode (SSTV/PSK31) operation When operating SSTV or PSK31 with your PC software, consult the manual that is supplied with the software. 20) w Push and hold F-INP ENT for 1 sec. , then push a BAND band key to select the desired band. r Turn data mode ON in the quick set mode. M-CH/RIT MODE TS Band keys NB V/M 1 1. 8 4 10 NR METER ANF A/B 2 = 3. 5 SPLIT 3 7 6 AGC 18 9 VOX 28 F-INP ENT BAND MW 5 M-CL 14 8 SCAN 24 0 MNF 50 7 COMP21 RIT GENE P. AMP ATT M-CH/RIT . TUNER FILTER SPCH SET · After SSB mode is selected, push and hold MODE for 1 sec. to toggle between USB and LSB modes. [DIAL] [M-CH] F-INP ENT BAND q Push and hold for 1 sec. e Rotate [DIAL] to select the data mode ON or OFF. ·" " appears when the data mode is turned ON. M-CH/RIT SET Data mode: ON (default: OFF) Either "USB" or "LSB" appears. r Push to exit the quick set mode and return to normal operation. t Rotate [DIAL] to tune in a desired signal and decoded correctly. · The S-meter indicates received signal strength when a signal is received. · During SSB data mode, ¼ tuning function can be used for critical tuning. Appears while transmitting. Appears y Use the PC (software) to transmit. · When operating in SSB data mode, adjust the AF output level from PC so that the ALC meter reading doesn't go outside the ALC zone. NOTE: When the data mode is selected, the audio input from the [ACC] connector* is used for transmission instead of [MIC] connector. The speech compressor function is turned OFF for the SSB data mode transmission. * The desired connector can be selected in the set mode. 77) 4 For your information Carrier point frequency is displayed when SSB data mode is selected. See the diagram below for the tone-pair example. · Example-- LSB/LSB data mode Mark freq. : 2125 Hz Shift freq. : 200 Hz 2325 Hz 200 Hz 2125 Hz Carrier (Displayed frequency) 43 FUNCTIONS FOR RECEIVE RIT function The RIT (Receive Incremental Tuning) function compensates for stations transmitting off-frequency or when you prefer to listen to slightly different-sounding voice characteristics, etc. [. . . ] 30 m (98. 4 ft) coaxial cable with PL-259 connector is supplied. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 94 IC-PW1/EURO HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER Full-duty 1 kW linear amplifier including an automatic antenna tuner. The amplifier/power supply unit and the remote control unit are separated. An optional OPC-599 is required for connection. 17 ABOUT CE INSTALLATION NOTES For amateur base station installations it is recommended that the forward clearance in front of the antenna array is calculated relative to the EIRP (Effective Isotropic Radiated Power). The clearance height below the antenna array can be determined in most cases from the RF power at the antenna input terminals. [. . . ]