Icom IC-7100 Advanced Instructions - Page 305

Operating the AT-180, Before operating

Page 305 highlights

Previous view 16 ANTENNA TUNER OPERATION Operating the AT-180 DDBefore operating 1. About using antenna: CAUTION: • NEVER connect the antenna worth than 3:1 anten- na. Even if the antenna tuner tune this antenna, it causes to damage the antenna tuner. • NEVER transmit with the tuner ON if no antenna is connected. This will damage both the transceiver and antenna tuner. • Check the untuned antenna SWR. (Less than 3:1 for the HF bands; Less than 2.5:1 for the 50 MHz band) • Before start tuning, monitor the operating frequency to make sure transmitting won't cause interference to other stations on the same frequency. 2. If the tuner cannot tune the antenna: ❍ Check the untuned antenna SWR. If its SWR is worth than 3:1, adjust the SWR. ❍ Check the transmit power. If the transmit power is less than 8 W, adjust the RF power on the Mic gain/RF power adjustment display. q Push MIC/RF PWR (C) to open the MIC gain/RF power adjustment display. w Rotate [BANK] (L) to adjust the RF power. e Push MENU (C) to close the display. ❍ Check the power source voltage/current capacity. ❍ If the tuner still cannot reduce the SWR to less than 1.5:1 after checking the above, perform the following: • Try manual tuning one or more times. • Adjust the antenna feedline length. (This is effec- tive for higher frequencies in some cases.) • E ven if manual tuning does not match the antenna and the tuner turns OFF the first time, it may match the antenna the second time. ❍ Tuning a narrow bandwidth antenna Some antennas, especially for the low bands, have a narrow bandwidth. These antennas may not be tuned beyond the edge of their operating bandwidth, therefore, manually tune such an antenna as follows: [Example]: Suppose you have an antenna which has an SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz. q Select 3.55 MHz and hold down TUNER/CALL (L) for 1 second to start manual tuning. w Select 3.80 MHz and hold down TUNER/CALL (L) for 1 second to start manual tuning. 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) 16-5

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
  • 212
  • 213
  • 214
  • 215
  • 216
  • 217
  • 218
  • 219
  • 220
  • 221
  • 222
  • 223
  • 224
  • 225
  • 226
  • 227
  • 228
  • 229
  • 230
  • 231
  • 232
  • 233
  • 234
  • 235
  • 236
  • 237
  • 238
  • 239
  • 240
  • 241
  • 242
  • 243
  • 244
  • 245
  • 246
  • 247
  • 248
  • 249
  • 250
  • 251
  • 252
  • 253
  • 254
  • 255
  • 256
  • 257
  • 258
  • 259
  • 260
  • 261
  • 262
  • 263
  • 264
  • 265
  • 266
  • 267
  • 268
  • 269
  • 270
  • 271
  • 272
  • 273
  • 274
  • 275
  • 276
  • 277
  • 278
  • 279
  • 280
  • 281
  • 282
  • 283
  • 284
  • 285
  • 286
  • 287
  • 288
  • 289
  • 290
  • 291
  • 292
  • 293
  • 294
  • 295
  • 296
  • 297
  • 298
  • 299
  • 300
  • 301
  • 302
  • 303
  • 304
  • 305
  • 306
  • 307
  • 308
  • 309
  • 310
  • 311
  • 312
  • 313
  • 314
  • 315
  • 316
  • 317
  • 318
  • 319
  • 320
  • 321
  • 322
  • 323
  • 324
  • 325
  • 326
  • 327
  • 328
  • 329
  • 330
  • 331
  • 332
  • 333
  • 334
  • 335
  • 336
  • 337
  • 338
  • 339
  • 340
  • 341
  • 342
  • 343
  • 344
  • 345
  • 346
  • 347
  • 348
  • 349
  • 350
  • 351
  • 352
  • 353
  • 354
  • 355
  • 356
  • 357
  • 358
  • 359
  • 360
  • 361
  • 362
  • 363
  • 364
  • 365
  • 366
  • 367
  • 368
  • 369
  • 370
  • 371
  • 372
  • 373
  • 374
  • 375
  • 376
  • 377
  • 378
  • 379

16
ANTENNA TUNER OPERATION
16-5
Operating the AT-180
D
Before operating
About using antenna:
1.
CAUTION:
NEVER
connect the antenna worth than 3:1 anten
-
na. Even if the antenna tuner tune this antenna, it
causes to damage the antenna tuner.
NEVER
transmit with the tuner ON if no antenna is
connected. This will damage both the transceiver
and antenna tuner.
• Check the untuned antenna SWR. (Less than 3:1 for
the HF bands; Less than 2.5:1 for the 50 MHz band)
• Before start tuning, monitor the operating frequency
to make sure transmitting won’t cause interference to
other stations on the same frequency.
If the tuner cannot tune the antenna:
2.
Check the untuned antenna SWR.
If its SWR is worth than 3:1, adjust the SWR.
Check the transmit power.
If the transmit power is less than 8 W, adjust the RF
power on the Mic gain/RF power adjustment dis
-
play.
q
Push
MIC/RF PWR
(
C
) to open the MIC gain/RF
power adjustment display.
w
Rotate [BANK]
(
L
) to adjust the RF power.
e
Push
MENU
(
C
) to close the display.
Check the power source voltage/current capacity.
If the tuner still cannot reduce the SWR to less than
1.5:1 after checking the above, perform the follow
-
ing:
• Try manual tuning one or more times.
• Adjust the antenna feedline length. (This is effec
-
tive for higher frequencies in some cases.)
Even if manual tuning does not match the antenna
and the tuner turns OFF the first time, it may match
the antenna the second time.
Tuning a narrow bandwidth antenna
Some antennas, especially for the low bands, have a
narrow bandwidth.These antennas may not be tuned
beyond the edge of their operating bandwidth, there
-
fore, manually tune such an antenna as follows:
[Example]:
Suppose you have an antenna which
has an SWR of 1.5:1 at 3.55 MHz and
an SWR of 3:1 at 3.8 MHz.
q
Select 3.55 MHz and hold down
TUNER/CALL
(
L
)
for 1 second to start manual tuning.
w
Select 3.80 MHz and hold down
TUNER/CALL
(
L
)
for 1 second to start manual tuning.
L
eft
R
ight
C
enter
D
isplay
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)