User manual ICOM IC-720A

[. . . ] 1 r Spare fuse (ATC 30 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 t ACC cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 y 3. 5 (d) mm plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 u 6. 3 (d) mm Electronic keyer plug . . . . . . . . . . . . . . . . . . . . . . [. . . ] 50) Push NR to turn the noise reduction ON or OFF. ·" " appears when the noise reduction is ON. NR Push and hold for 1 sec. to enter the noise reduction level set mode, then rotate [DIAL] to adjust the noise reduction level. D Convenient functions for transmit · Break-in function (p. w Rotate [M-CH] to select "BK-IN". e Rotate [DIAL] to select the CW break-in operation from full break-in, semi break-in or OFF. · FL : Full break-in · SE : Semi break-in · OF : Break-in OFF · Keying speed setting (p. w Rotate [M-CH] to select "KEY SPD". e Rotate [DIAL] to adjust the CW key speed from 6 to 60 wpm. r Push M-CH/RIT to exit the quick set mode and reSET turn to normal operation. 15 16 17 18 19 20 21 36 r Push M-CH/RIT to exit the set mode and return to SET normal operation. 4 RECEIVE AND TRANSMIT D CW reverse mode The CW-R (CW Reverse) mode receives CW signals on the reverse sideband like that of LSB and USB modes. MODE TS 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 7 COMP21 5 M-CL 14 8 SCAN 24 0 MNF 50 RIT GENE P. AMP ATT M-CH/RIT . Use when interference is near the desired signal and you want to shift the tone of the interfering signal. q Push MODE several times to select CW mode. to select CW or CW-R mode. · Check the interference tone. TUNER FILTER SPCH SET · Receive audio tone response 600 Hz Push and hold for 1 sec. 600 Hz BFO Inteference Desired signal CW mode (LSB side) BFO Inteference Desired signal CW-R mode (USB side) D CW pitch control The received CW audio pitch and monitored CW audio pitch can be adjusted to suit your preferences (300 to 900 Hz) without changing the operating frequency. q When CW (CW-R) mode is selected, push and hold M-CH/RIT for 1 sec. SET w Rotate [M-CH] to select "CW PITCH", then rotate [DIAL] to set the desired pitch. · CW pitch is adjusted in 10 Hz steps (300 to 900 Hz). 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 MODE TS RIT GENE P. AMP ATT M-CH/RIT . 0 MNF 50 TUNER FILTER SPCH SET [DIAL] [M-CH] e Push M-CH/RIT to exit the quick set mode and reSET turn to normal operation. This shows the default setting for the CW pitch control (600 Hz). 37 RECEIVE AND TRANSMIT 4 D CW side tone function When the transceiver is in receive (and the break-in function is OFF-- pgs. to enter the manual notch filter set mode, then rotate [DIAL] to select the filter width from narrow, middle and wide. w Rotate [M-CH] to select "DIAL ¼". e Rotate [DIAL] to turn the 1/4 function ON or OFF. r Push M-CH/RIT to exit the set mode and return to SET normal operation. Push and hold function OFF. AGC for 1 sec. to turn the AGC · "AGC-OFF" appears on the display. · Noise blanker (p. 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. w After RTTY mode is selected, push and hold MODE for 1 sec. to toggle between RTTY and RTTY-R modes. Normal Space Mark 170 Hz 2125 Hz BFO BFO Displayed freq. [. . . ] Below 30 MHz, the recommended limits are specified in terms of V/m or A/m fields as they are likely to fall within the near-field region. Similarly, the antennas may be physically short in terms of electrical length and that the installation will require some antenna matching device which can create local, high intensity magnetic fields. Analysis of such MF installations is best considered in association with published guidance notes such as the FCC OET Bulletin 65 Edition 97-01 and its annexes relative to amateur transmitter installations. The EC recommended limits are almost identical to the FCC specified `uncontrolled' limits and tables exist that show pre-calculated safe distances for different antenna types for different frequency bands. [. . . ]