User manual ICOM IC-7400

[. . . ] INSTRUCTION MANUAL HF/VHF ALL MODE TRANSCEIVER i7400 FOREWORD We understand that you have a choice of many different radios in the market place. We want to take a couple of moments of your time to thank you for making the IC-7400 your radio of choice, and hope you agree with Icom's philosophy of "technology first". Many hours of research and development went into the design of your IC-7400. PRECAUTIONS R WARNING HIGH VOLTAGE!NEVER attach an antenna or internal antenna connector during transmission. R NEVER apply more than 16 V DC, such as a 24 V battery, to the [DC13. 8V] jack on the transceiver rear panel. [. . . ] 47) Push [P. AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. · "P. AMP1, " "P. AMP2" or "P. AMP" appears when the preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band) · Noise reduction (p. 52) Push [NR] to turn the noise reduction ON and OFF. · Rotate [NR] control to adjust the noise reduction level. · "NR" appears when the noise reduction is set to ON. Push [P. AMP/ATT] for 1 sec. to set the attenuator ON. · Push [P. AMP/ATT] momentarily to turn the attenuator OFF. · "ATT" appears when the attenuator is set to ON. · Auto notch filter (p. 52) Push [A/NOTCH] to turn the auto or manual notch filter ON and OFF. · Rotate [NOTCH] control to set the attenuating frequency for manual notch operation. · Noise blanker (p. 50) Push [NB] to turn the noise blanker ON and OFF. · "NB" appears when the noise blanker is set to ON. to enter noise blanker set mode. · VSC (voice squelch control) (p. 53) While M2 is selected with [MENU], push [F5 VSC] to turn the VSC function ON and OFF. · The VSC indicator appears when the voice squelch function is set to ON. D Convenient functions for transmit · Speech compressor (p. 57) While M1 is selected with [MENU], push [F3 CMP] to turn the speech compressor ON and OFF. · "COMP" appears when the speech compressor is set to ON. · Transmit quality monitor (p. 56) Push [MONITOR] to turn the monitor function ON and OFF. · "MONI" appears when the monitor function is set to ON. · VOX (voice operated transmit) (p. 54) Push [VOX/BK-IN] to turn the VOX function ON and OFF. · "VOX" appears when the VOX function is set to ON. · Audio tone control (p. 88) While M2 is selected with [MENU], push [F4 TCN], select an item with [F1 ] and [F2 ] then rotate the tuning dial to adjust the audio tone. 41 RECEIVE AND TRANSMIT 4 D Tone squelch operation Tone squelch operation is a method of communications using selective calling. Before communicating using tone squelch, all members of your party must agree on the tone squelch frequency to use. e Push [F4 TON] several times to turn the tone squelch function ON. · "TSQL" appears AGC F1 DUP F2 CMP F3 TON F4 SCP F5 r Push [F4 TONE] for 1 sec. y Rotate the tuning dial to select the desired tone squelch frequency. · Push [F3] for 1 sec. to select the default frequency. Push [F4] for 1 sec. TON F1 TSQL SCN F2 Tone 88. 5Hz F3 F4 F5 u Push [MENU] to return to M1. · Available tone squelch frequencies 67. 0 69. 3 71. 9 74. 4 77. 0 79. 7 82. 5 085. 4 088. 5 091. 5 094. 8 097. 4 100. 0 103. 5 107. 2 110. 9 114. 8 118. 8 123. 0 127. 3 131. 8 136. 5 141. 3 146. 2 151. 4 156. 7 159. 8 162. 2 165. 5 167. 9 171. 3 173. 8 177. 3 179. 9 183. 5 186. 2 189. 9 192. 8 196. 6 199. 5 203. 5 206. 5 (Unit: Hz) 210. 7 254. 1 218. 1 225. 7 229. 1 233. 6 241. 8 250. 3 42 4 RECEIVE AND TRANSMIT D DTCS operation DTCS function is an another method of communications using selective calling. Only received signals having a matching 3-digit code will open the squelch. e Push [F4 TON] several times to turn the DTCS function ON. · "DTCS" appears r Push [F4 TON] for 1 sec. y Rotate the tuning dial to select the desired DTCS code number and push [F5] to select the desired code polarity. [. . . ] You can change frequencies, operating mode, memory channels, etc. CR-338 HIGH STABILITY CRYSTAL UNIT Contains a temperature-compensating oven heater and crystal unit for improved frequency stability. · Frequency stability: ±0. 5 ppm HM-36 HAND MICROPHONE Hand microphone equipped [UP]/[DOWN] switches. with ·About DC power supply The use of IC-7400 (#03, #04, #05, #08, #09) in combination with the DC power supply complies with European Harmonised Standard regulations under the conditions listed below. Conditions ·In combination with PS-125 ·About IC-PW1 LINEAR AMPLIFIER The IC-PW1 LINEAR AMPLIFIER does not comply with European Harmonised Standard regulations. [. . . ]