Redback C 8890D User manual

REDBACK®UHF Band Diversity Wireless Microphone System
®
Operating Instructions
Manufactured exclusively for Altronic Distributors Pty Ltd
REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 16
700 Channel UHF Band True Diversity
Wireless Microphone System
Revision 23092015
Altronic Distributors warrants this product for 12 months from date of purchase from Altronics or its resellers to the consumer. If
this item is part of an installation or another product, please contact the installer or supplier for your warranty.
During the warranty period, we undertake to repair or replace your product at no charge if found to be defective due to a
manufacturing fault. The warranty excludes damage by misuse or incorrect installation (i.e. failure to install and operate device
according to specifications in the supplied instruction manual), neglect, shipping accident, or no fault found, nor by use in a way
or manner not intended by the supplier.
For repair or service please contact your PLACE OF PURCHASE.
If this item was purchased directly from Altronics please make a warranty claim by:
1. FOR MAIL ORDER CUSTOMERS (includes school and trade orders),
a) Ringing us on 1300 797 007 and quoting your Tax invoice number.
b) Upon contacting Altronics, we will issue an R.A. (Return Authorisation). As Altronics have a
number of service agents throughout Australia, a copy of the R.A. will be emailed, faxed or mailed
to you with full instructions of how and where to send the goods. The freight for shipping goods back
to Altronics for all repairs is at the customers expense.
c) A copy of the R.A. form, (or at the very minimum, the R.A. number) must accompany the goods
to effect the repair.
d) Altronics will pay the return freight to the customer where the warranty claim has been accepted.
e) Please quote the R.A. number in any correspondence to us.
2. FOR OVER THE COUNTER PURCHASES; to make a warranty claim, please return the goods to us in
any of our stores, with a copy of your proof of purchase (tax invoice).
a) Upon leaving the goods at one of our stores, an R.A. (return authorisation) number will be issued
to you.
b) Once repaired, you will be contacted, advising that the goods are ready to be collected from the
store.
It is at Altronics discretion as to whether the goods will be repaired or replaced (whilst under warranty); and as to whether
identical goods will be used to replace the item due to changes of models / products.
Note: Under no circumstances should you attempt to repair the device yourself or via a non-authorised Altronics service centre,
as this will invalidate the warranty!
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement
or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to
have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major
failure.
NOT FIELD SERVICEABLE.
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia.
Phone: [phone] Fax: [phone]
Internet: www.altronics.com.au

Page 15
REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Congratulations on purchasing a REDBACK PLL synthesized true diversity wireless microphone system. The UHF band wireless
microphone and receiver are the latest generation high quality audio systems. The PLL synthesized diversity wireless
microphone system operates on UHF band frequency (520-550MHz) with 700 selectable channels. Please read this instruction
manual completely before operating the system. These instructions cover the transmitters, and receiver model C 8890D. The
receiver unit is used with compatible 700 channel handheld (C 8892D) and lavalier (C 8893D) transmitters.
System Features:
• Operates on UHF band frequency range 520-550MHz with PLL synthesized control.
• Auto-scan function to easily find an interference free channel.
• Preset channel groups allow up to 8 transmitters and receivers with the use of the autoscan function, up to 12 transmitters
can be used in the same location.
• PLL (Phase Locked Loop) synthesized wireless microphone system with 700 selectable frequencies
making it easy to choose non-interference channels.
• Excellent reception system ensures super high sensitivity, and a high signal to noise ratio.
• Units are supplied with SMT assembled PCB modules ensuring high reliability and easy serviceability.
• High dynamic range handheld microphone for all vocal applications.
• Lapel microphone that minimises static pickup resulting in very low noise.
Receiver Features:
• 12V DC Power supply (supplied)
• Half 19” size case with power and RF indicators. Rack ears available for mounting one or two systems into
19” rack equipment.
• Removable aerials making the unit suitable for portable or fixed installations. Aerials are fitted with BNC connectors.
• Includes in-built power supply for antenna booster.
Receiver Specifications:
Carrier Frequency Range: .................................................................................................................. UHF band 520-550MHz
Frequency Stability: ................................................................................................ ±0.005% with PLL synthesized controlled
S/N Ratio: ...................................................................................................................................... Over 100dB, at 60dB/μV
Image and Spurious Rejection: ...................................................................................................................... 80 dB minimum
Receiving Sensitivity: .......................................................................................................... 2uV over 52dB/uV antenna input
Selectivity: .................................................................................................................................................................. >50dB
Dynamic Range: ........................................................................................................................................................ >100dB
Modulation Mode: ..............................................................................................................................................................FM
IF Frequency: ...................................................................................................................... 1st : 243.95MHz 2nd: 10.7MHz
Service Area: .................................................................................................................................. 100m in ideal conditions
AF Response: ...................................................................................................................................... 80Hz to 16kHz(±3dB)
T.H.D.: ................................................................................................................................................Less than 1% (at 1kHz)
Receiver Audio Output: ........................................................................ Unbalanced: max. 775mV (0dB=0.775V) at 5kΩLoad
Balanced: max. 1V (0dB=1V) at 5kΩLoad
Dimensions: ......................................................................................................................................200W x 42H x 183Dmm
Receiver Power Supply: .................................................................................. 12V DC Adapter (current consumption 520mA)
Transmitter Specifications (transmitters sold separately):
Carrier Frequency Range: .................................................................................................................. UHF band 520-550MHz
RF Power Output: .............................................................................................................................................. 10mW (max.)
Spurious Emission: .................................................................................................. More than 60dB below carrier frequency
T.H.D.: ................................................................................................................................................Less than 1% (at 1kHz)
Frequency Stability: ...................................................................................... Within ±0.005% with PLL synthesized controlled
Maximum Deviation: ........................................................................................................ ±48kHz within limiting compressor
Microphone Capsule: .................................................................................................. Uni-directional condenser microphone
Operating Voltage:.......................................................................................................... DC1.5Vx2 AA (UM-3) or rechargeable
Current Consumption: .............................................................................................................. Approx 120mA ± 10mA(max.)
Page 2
CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ.
351 535.025 386 536.175 421 537.350 456 538.525 491 539.675 526 541.275 561 543.025 596 544.775 631 546.525 666 548.275 352 535.050 387 536.225 422 537.375 457 538.550 492 539.725 527 541.325 562 543.075 597 544.825 632 546.575 667 548.325
353 535.075 388 536.250 423 537.425 458 538.575 493 539.750 528 541.375 563 543.125 598 544.875 633 546.625 668 548.375
354 535.125 389 536.275 424 537.450 459 538.625 494 539.775 529 541.425 564 543.175 599 544.925 634 546.675 669 548.425 355 535.150 390 536.325 425 537.475 460 538.650 495 539.825 530 541.475 565 543.225 600 544.975 635 546.725 670 548.475 356 535.175 391 536.350 426 537.525 461 538.675 496 539.850 531 541.525 566 543.275 601 545.025 636 546.775 671 548.525
357 535.225 392 536.375 427 537.550 462 538.725 497 539.875 532 541.575 567 543.325 602 545.075 637 546.825 672 548.575 358 535.250 393 536.425 428 537.575 463 538.750 498 539.925 533 541.625 568 543.375 603 545.125 638 546.875 673 548.625 359 535.275 394 536.450 429 537.625 464 538.775 499 539.950 534 541.675 569 543.425 604 545.175 639 546.925 674 548.675
360 535.325 395 536.475 430 537.650 465 538.825 500 539.975 535 541.725 570 543.475 605 545.225 640 546.975 675 548.725 361 535.350 396 536.525 431 537.675 466 538.850 501 540.025 536 541.775 571 543.525 606 545.275 641 547.025 676 548.775
362 535.375 397 536.550 432 537.725 467 538.875 502 540.075 537 541.825 572 543.575 607 545.325 642 547.075 677 548.825
363 535.425 398 536.575 433 537.750 468 538.925 503 540.125 538 541.875 573 543.625 608 545.375 643 547.125 678 548.875 364 535.450 399 536.625 434 537.775 469 538.950 504 540.175 539 541.925 574 543.675 609 545.425 644 547.175 679 548.925 365 535.475 400 536.650 435 537.825 470 538.975 505 540.225 540 541.975 575 543.725 610 545.475 645 547.225 680 548.975
366 535.525 401 536.675 436 537.850 471 539.025 506 540.275 541 542.025 576 543.775 611 545.525 646 547.275 681 549.025
367 535.550 402 536.725 437 537.875 472 539.050 507 540.325 542 542.075 577 543.825 612 545.575 647 547.325 682 549.075 368 535.575 403 536.750 438 537.925 473 539.075 508 540.375 543 542.125 578 543.875 613 545.625 648 547.375 683 549.125
369 535.625 404 536.775 439 537.950 474 539.125 509 540.425 544 542.175 579 543.925 614 545.675 649 547.425 684 549.175 370 535.650 405 536.825 440 537.975 475 539.150 510 540.475 545 542.225 580 543.975 615 545.725 650 547.475 685 549.225 371 535.675 406 536.850 441 538.025 476 539.175 511 540.525 546 542.275 581 544.025 616 545.775 651 547.525 686 549.275
372 535.725 407 536.875 442 538.050 477 539.225 512 540.575 547 542.325 582 544.075 617 545.825 652 547.575 687 549.325 373 535.750 408 536.925 443 538.075 478 539.250 513 540.625 548 542.375 583 544.125 618 545.875 653 547.625 688 549.375 374 535.775 409 536.950 444 538.125 479 539.275 514 540.675 549 542.425 584 544.175 619 545.925 654 547.675 689 549.425
375 535.825 410 536.975 445 538.150 480 539.325 515 540.725 550 542.475 585 544.225 620 545.975 655 547.725 690 549.475 376 535.850 411 537.025 446 538.175 481 539.350 516 540.775 551 542.525 586 544.275 621 546.025 656 547.775 691 549.525 377 535.875 412 537.050 447 538.225 482 539.375 517 540.825 552 542.575 587 544.325 622 546.075 657 547.825 692 549.575
378 535.925 413 537.075 448 538.250 483 539.425 518 540.875 553 542.625 588 544.375 623 546.125 658 547.875 693 549.625
379 535.950 414 537.125 449 538.275 484 539.450 519 540.925 554 542.675 589 544.425 624 546.175 659 547.925 694 549.675 380 535.975 415 537.150 450 538.325 485 539.475 520 540.975 555 542.725 590 544.475 625 546.225 660 547.975 695 549.725
381 536.025 416 537.175 451 538.350 486 539.525 521 541.025 556 542.775 591 544.525 626 546.275 661 548.025 696 549.775 382 536.050 417 537.225 452 538.375 487 539.550 522 541.075 557 542.825 592 544.575 627 546.325 662 548.075 697 549.825 383 536.075 418 537.250 453 538.425 488 539.575 523 541.125 558 542.875 593 544.625 628 546.375 663 548.125 698 549.875 384 536.125 419 537.275 454 538.450 489 539.625 524 541.175 559 542.925 594 544.675 629 546.425 664 548.175 699 549.925
385 536.150 420 537.325 455 538.475 490 539.650 525 541.225 560 542.975 595 544.725 630 546.475 665 548.225 700 549.950

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 14 Page 3
Figure 1: Front Panel View
Figure 2: LCD Screen View
REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
1. Power ON/OFF button.
2. LCD: Displays the channel number, frequency level, RF & AF signal strength, and mode.
3. ▲▼ Buttons: Select channel up/down.
4. SYNC: Press this button when synchronising the receiver and transmitter frequency. See SYNC Mode (Page 7)
for operation description.
5. Set Button: See ‘Channel Selection Modes’ (Pages 4-6) section for more information on this button’s operation.
6. Volume Control: Use this rotary control to adjust the receiver output level to match the input sensitivity of an audio
mixer or an amplifier.
1. MANUAL: This mode allows you to select your own interference free channels.
2. SCAN: This mode auto scans for an interference free channel and selects one automatically.
3. PRESET: This mode selects an interference-free channel from preset-groups. There are 4 preset groups. In each
group there are 8 preset channels (see Table 1). This allows up to 8 systems to be used simultaneously.
4. SYNC: Indicates the unit is attempting to sync with a nearby transmitter (see SYNC mode - page 7).
5. GP: Indicates the preset group number, eg. P1, P2 etc.
6. CH: Indicates the preset channel number from within each preset group eg. C1, C2 etc.
7. CH: Indicates the channel number, from 001 to 700.
8. FREQ: Indicates the frequency.
9. MUTE: Indicates audio output is being muted.
10. RF Level Indicators: 5-segment meter illuminates to indicate RF signal strength.
11. AF Level Indicators: 5-segment meter illuminates to indicate audio signal strength.
CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ. CH FREQ.
1 520.050 36 521.775 71 523.525 106 525.275 141 527.025 176 528.775 211 530.350 246 531.525 281 532.675 316 533.850
2 520.075 37 521.825 72 523.575 107 525.325 142 527.075 177 528.825 212 530.375 247 531.550 282 532.725 317 533.875 3 520.125 38 521.875 73 523.625 108 525.375 143 527.125 178 528.875 213 530.425 248 531.575 283 532.750 318 533.925 4 520.175 39 521.925 74 523.675 109 525.425 144 527.175 179 528.925 214 530.450 249 531.625 284 532.775 319 533.950
5 520.225 40 521.975 75 523.725 110 525.475 145 527.225 180 528.975 215 530.475 250 531.650 285 532.825 320 533.975
6 520.275 41 522.025 76 523.775 111 525.525 146 527.275 181 529.025 216 530.525 251 531.675 286 532.850 321 534.025 7 520.325 42 522.075 77 523.825 112 525.575 147 527.325 182 529.075 217 530.550 252 531.725 287 532.875 322 534.050
8 520.375 43 522.125 78 523.875 113 525.625 148 527.375 183 529.125 218 530.575 253 531.750 288 532.925 323 534.075 9 520.425 44 522.175 79 523.925 114 525.675 149 527.425 184 529.175 219 530.625 254 531.775 289 532.950 324 534.125
10 520.475 45 522.225 80 523.975 115 525.725 150 527.475 185 529.225 220 530.650 255 531.825 290 532.975 325 534.150 11 520.525 46 522.275 81 524.025 116 525.775 151 527.525 186 529.275 221 530.675 256 531.850 291 533.025 326 534.175
12 520.575 47 522.325 82 524.075 117 525.825 152 527.575 187 529.325 222 530.725 257 531.875 292 533.050 327 534.225
13 520.625 48 522.375 83 524.125 118 525.875 153 527.625 188 529.375 223 530.750 258 531.925 293 533.075 328 534.250 14 520.675 49 522.425 84 524.175 119 525.925 154 527.675 189 529.425 224 530.775 259 531.950 294 533.125 329 534.275
15 520.725 50 522.475 85 524.225 120 525.975 155 527.725 190 529.475 225 530.825 260 531.975 295 533.150 330 534.325 16 520.775 51 522.525 86 524.275 121 526.025 156 527.775 191 529.525 226 530.850 261 532.025 296 533.175 331 534.350 17 520.825 52 522.575 87 524.325 122 526.075 157 527.825 192 529.575 227 530.875 262 532.050 297 533.225 332 534.375
18 520.875 53 522.625 88 524.375 123 526.125 158 527.875 193 529.625 228 530.925 263 532.075 298 533.250 333 534.425
19 520.925 54 522.675 89 524.425 124 526.175 159 527.925 194 529.675 229 530.950 264 532.125 299 533.275 334 534.450 20 520.975 55 522.725 90 524.475 125 526.225 160 527.975 195 529.725 230 530.975 265 532.150 300 533.325 335 534.475 21 521.025 56 522.775 91 524.525 126 526.275 161 528.025 196 529.775 231 531.025 266 532.175 301 533.350 336 534.525
22 521.075 57 522.825 92 524.575 127 526.325 162 528.075 197 529.825 232 531.050 267 532.225 302 533.375 337 534.550 23 521.125 58 522.875 93 524.625 128 526.375 163 528.125 198 529.875 233 531.075 268 532.250 303 533.425 338 534.575 24 521.175 59 522.925 94 524.675 129 526.425 164 528.175 199 529.925 234 531.125 269 532.275 304 533.450 339 534.625
25 521.225 60 522.975 95 524.725 130 526.475 165 528.225 200 529.975 235 531.150 270 532.325 305 533.475 340 534.650 26 521.275 61 523.025 96 524.775 131 526.525 166 528.275 201 530.025 236 531.175 271 532.350 306 533.525 341 534.675
27 521.325 62 523.075 97 524.825 132 526.575 167 528.325 202 530.050 237 531.225 272 532.375 307 533.550 342 534.725
28 521.375 63 523.125 98 524.875 133 526.625 168 528.375 203 530.075 238 531.250 273 532.425 308 533.575 343 534.750 29 521.425 64 523.175 99 524.925 134 526.675 169 528.425 204 530.125 239 531.275 274 532.450 309 533.625 344 534.775
30 521.475 65 523.225 100 524.975 135 526.725 170 528.475 205 530.150 240 531.325 275 532.475 310 533.650 345 534.825 31 521.525 66 523.275 101 525.025 136 526.775 171 528.525 206 530.175 241 531.350 276 532.525 311 533.675 346 534.850
32 521.575 67 523.325 102 525.075 137 526.825 172 528.575 207 530.225 242 531.375 277 532.550 312 533.725 347 534.875 33 521.625 68 523.375 103 525.125 138 526.875 173 528.625 208 530.250 243 531.425 278 532.575 313 533.750 348 534.925 34 521.675 69 523.425 104 525.175 139 526.925 174 528.675 209 530.275 244 531.450 279 532.625 314 533.775 349 534.950
35 521.725 70 523.475 105 525.225 140 526.975 175 528.725 210 530.325 245 531.475 280 532.650 315 533.825 350 534.975
520-550MHz
Continued next page

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 4 Page13
Connection:
1. Connect the cable, one end to the balanced or unbalanced output jack of the receiver, the other end to the mic mixing
input of amplifier, audio mixer etc.
2. For best results set the output volume control at about three quarter level and adjust mixer / amplifier level to suit.
3. The squelch level is adjustable by the rotary pot at the back of the unit. Adjust the squelch level to prevent
external noise. Note: setting the squelch high (towards max) will reduce the range of the system.
4. When the receiver is not in use disconnect from the mains power.
IMPORTANT NOTE: Never use the balanced and unbalanced outputs at the same time.
This may cause signal loss or increased noise.
1. Antenna Input Connector: BNC-type connectors provide connection to the supplied antennas or to coaxial cable
used with an antenna divider, antenna boosters or remote antennas.
2. Balanced Output: 3-pin XLR connector provides balanced low-impedance output.
3. Unbalanced Output: Unbalanced 6.3mm mono jack audio output for connecting to a line point.
4. Mic/Line Switch: Use this to adjust output (XLR balanced connector and 6.35mm unbalanced phone jack) for
microphone (-20dB) or line-level (0dB).
5. Squelch: Use the squelch to adjust the output level to suppress noise. The higher the squelch control, the lower the
sensitivity of the receiver and smaller the service area of the system. Set the squelch to minimum before turning
the receiver on. If you have unwanted noise increase the squelch control until the noise disappears.
6. DC IN: DC Input connector for the included 12V DC power supply.
Figure 3: Rear Panel View For long distance requirements or special or difficult applications such as stadiums, auditoriums, shopping centres, a range of
accessories are available to increase transmission distance or to reduce drop outs.
These include:
C8841A Ceiling mount antenna
C8842A Vertical mount antenna booster
C8843A Mounting bracket to suit C 8842A antenna booster
In addition to the above, for multiple system installations a range of accessories are available to aid cabling and installation.
These include:
C8844A Antenna splitter / combiner
C8846B Antenna divider
For further information on these and technical help please contact your nearest Redback dealer or consult the product manuals
for the above.
C 8842A Booster
Antenna AntennaC 8843A
Bracket
The antenna booster is designed for long distance receiving applications, eg. if the distance exceeds 30M.

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 12
REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 5
Note: TWO OR MORE WIRELESS MICROPHONES WHICH TRANSMIT AT THE SAME FREQUENCY CAN NOT BE
USED IN THE SAME LOCATION.
WHEN TWO OR MORE WIRELESS MICROPHONES (HANDHELD AND/OR LAVALIER) ARE USED IN THE SAME
LOCATION ENSURE THAT 10 OR MORE CHANNEL SPACES ARE BETWEEN EACH SELECTED FREQUENCY SO
THAT INTERFERENCE DOES NOT OCCUR.
If interference still occurs (which is due to harmonics) select another frequency. TABLE 1 shows 4 groups of 8
frequencies which may be used together in the same area. ALTERNATIVELY USE THE SCAN FUNCTION.
TROUBLESHOOTING:
Signal dropouts and noise may be suddenly encountered by interruption from outside if there is too long a distance between
microphone and receiver, or battery power is low. In such a case, adjust receiver antenna or change battery.
No Sound Output • Check the transmitter and receiver power supply and switch.
• Check that the transmitter and receiver are tuned to the same frequency.
• Check that the audio amplifier or mixer is switched on and that the receiver
output is connected.
• Check whether transmitter is too far away from receiver or SQUELCH control
set too high.
• Check whether transmitter or receiver is located too close to a metal object or there are
obstructions between transmitter and receiver.
Sound Interference • When using two or more microphone sets simultaneously, ensure that the chosen
frequencies do not interfere (see Table 1 for frequency guide).
• Check for interference from other devices - wireless microphones, TV, radio etc.
• Improve antenna location.
Distortion • Check the receiver volume level is not set too high.
• Check for interference from other devices - wireless microphones, TV, radio etc.
PRECAUTIONS:
* Avoid extremely dirty, dusty or wet environments.
* Avoid use in areas where extremely high humidity is present. Do not spill liquid on appliance or use near water.
* Do not drop the microphone on a hard concrete floor, nor strike the microphone head front with fist or fingers,
nor blow strongly into the microphone head front.
* Remove the battery in microphone if not in use for a long time. This will prevent damage that a defective
TABLE 1: 520-550MHz
CH GROUP 1 CH GROUP 2 CH GROUP 3 CH GROUP 4
CH 1 2 520.075 18 520.875 32 521.575 65 523.225
CH 2 47 522.325 113 525.625 95 524.725 182 529.075
CH 3 162 528.075 133 526.625 308 533.575 323 534.075
CH 4 245 531.475 204 530.125 350 534.975 447 538.225
CH 5 399 536.625 264 532.125 378 535.925 504 540.175
CH 6 554 542.675 488 539.575 426 537.525 529 541.425
CH 7 608 545.375 647 547.325 542 542.075 572 543.575
CH 8 631 546.525 661 548.025 679 548.925 698 549.875
CHANNEL SELECTION MODES:
The receiver operates in three channel selection modes.
Manual Channel Selection:
This mode allows you to manually select interference free channels. Table 1 shows the frequencies available. If two
transmitters are being used in the same area, ensure the selected frequencies are at least 10 channel spaces apart.
This reduces interference.
Use the ▲button to select the MANUAL mode so
that the ‘MANUAL’ marker appears on the LCD
display.
Press the SET button for two seconds until the LCD
is flashing. Then release the button.
Use the ▲button to select the frequency. Hold the
▲button to fast forward through all available fre-
quencies until a suitable frequency is found. To
move backwards use the ▼button.
Press the SET button to lock the setting or let the
selected channel and frequency values keep
flashing five times, until they lock into that setting.

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic SystemREDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 11Page 6
3 Pin XLR Lead
AMPLIFIER
SPEAKER
Mic IN Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
Figure 6: Wireless Receiver Connection Via Mic In
AMPLIFIER
SPEAKER
Mic IN Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
6.35mm Stereo jack Lead
Figure 7: Wireless Receiver Connection Via Line In
Figure 8: The unit may be 19” rack mounted individually, shown in (A) with additional C 8889 rack mount ears (sold sepa-
rately). Or side by side with an additional receiver, shown in (B) - hardware included.
A. B.
Auto Scan Channel Selection:
This mode automatically searches for an interference free channel.
Note: Have the transmitter 1m from the receiver when using this function.
Use the ▲button to select the SCAN mode so that
the ‘SCAN’ marker appears on the LCD display.
Press the SET button for two seconds until the
LCD is flashing. Then release the button.
Use the ▲button to allow the unit to scan for a
vacant or unused frequency. Press the up arrow
button to initiate each frequency channel search
– no need to hold button.
Press the SET button to lock the setting or let the
selected channel and frequency values keep
flashing five times, until they lock into that setting.

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic SystemREDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
Page 10 Page 7
Beltpack Microphone:
A range of microphones and pickups are available for the belt pack transmitter including tie clip mic, lecture type headset and
aerobics type headset.
Figure 5: Beltpack Microphone Transmitter C 8893D
Operation: (See Fig 3.)
1. Slide open the battery compartment.
2. Insert two AA Size 1.5V batteries into the battery holder according to polarity (+) and (-) indicators marked on the battery
housing. The transmitter accepts dry cell batteries or rechargeable batteries.
3. Replace battery cover.
4. To switch on, push the power switch for 4 seconds (or until the LCD illuminates). The LCD shows channel number and
battery status.
5. To change channel/frequency, press the SYNC button and synchronise the receiver and transmitter frequency. See “SYNC
mode” for detailed instructions on how this function operates.
6. Adjust gain switch to optimum level to prevent overdriving (-10dB, 0dB, 10dB).
7. To switch off, press and hold the power button for 4 seconds or until the LCD displays ‘OFF’.
8. Remove the batteries from the unit if it is not to be used for a long time. This will prevent damage to the unit that a defective
leaking battery may cause.
Use the ▲button to select the PRESET mode so
that the ‘PRESET marker appears on the LCD
display.
Preset Channel Selection:
This mode is used when multiple C 8890D systems are used in the same area. Each receiver is setup to use PRESET mode. This
allows each receiver to select a channel in one of four preset groups. Within each preset group is eight selectable channels. See
Table 1 for a list of frequencies within each preset group. Once configured, up to eight transmitters and receivers may be used in
the same location without interference. If more than eight frequencies are required, once a group of eight is selected, go to
autoscan mode and continue to set frequencies nine through twelve.
If interference occurs within the selected preset group, try switching to the next preset group. If all groups exhibit interference,
use manual or auto scan mode to find a suitable channel.
Press the SET button to lock the setting or let the
selected channel and frequency values keep
flashing five times, until they lock into that setting.
Press the ▲button to scroll through the channel
numbers in order to select a preset frequency
channel.
Press the SET button again to change to the
channel selection zone within the chosen preset
group.
1. Power ON/Mute Button: Press for 4 seconds to power mic on or off. Short press to mute/unmute.
2. Power/Mute LED: Indicates power/mute and low battery status.
Red: ON.
Flashing red: Low battery (approx. 10 mins operation left).
Blue: Muting on
Flashing blue: Muting on & low battery (approx. 10 mins operation left).
3. SYNC: For frequency pairing with the receiver.
4. LCD: Displays channel number and battery power level.
5. Battery Compartment
6. Mini XLR Connector: For microphone or guitar pick-up.
7. Gain switch: Adjusts the input audio level of the transmitter. The gain adjustment is -10dB, 0, 10dB.
Press the SET button for two seconds until the LCD
is flashing. Then release the button.
Press the ▲button to select a preset group.

REDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic SystemREDBACK® C 8890D 700 Channel UHF Band Diversity Wireless Mic System
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Handheld Transmitter Features:
• High sensitivity unidirectional dynamic capsule reduces unwanted handling noise to a minimum
• Special noise absorption design which eliminates switch shock and handling noise.
• PLL synthesised control.
• Muting switch & LED indicator.
• Low battery LED indicator.
Operation: (See Fig 4.)
1. Unscrew to open the battery compartment.
2. Insert two AA Size 1.5V batteries into the battery holder according to polarity (+) and (-) indicators marked on the battery
housing. The transmitter accepts dry cell batteries or rechargeable batteries.
3. Replace battery cover.
4. Slide the power switch into the on position. The LCD shows channel number and battery status.
5. To change channel/frequency, press the SYNC button and synchronise the receiver and transmitter frequency. See “SYNC
mode” for detailed instructions on how this function operates.
6. To switch off, slide the power switch into the off position. The LCD displays ‘OFF’.
7. Remove the batteries from the unit if it is not to be used for a long time. This will prevent damage to the unit that a defective
leaking battery may cause.
PLEASE NOTE: ALL TRANSMITTERS ARE SOLD SEPARATELY
5
2
4
6
Figure 4: Handheld Microphone Transmitter C 8892D
<1M
OR
Step 4
Step 3
SYNC Mode:
Sync mode is designed to avoid having to manually
match channels on your receiver and transmitter. This
speeds up the set up process, especially in multi-system
environments.
Follow these steps to synchronise receiver and
transmitter frequencies:
1. Ensure receiver and handheld mic/beltpack are
switched on and within 1m of eachother
2. Select your desired interference free frequency on the
receiver.
3. Press and hold the SYNC button on the handheld
mic/beltpack. The ‘SYNC’ marker will start flashing on
the receiver LCD display.
4. Keep pressing the SYNC button on the transmitter.
Then press the SYNC button on the receiver at the same
time to transfer the selected frequency to your handheld
mic/beltpack.
1. Power ON/OFF/Mute Switch
2. Power/Mute LED:
Red: ON.
Flashing red: Low battery (approx. 10 mins operation left).
Blue: Muting on
Flashing blue: Muting on & low battery (approx. 10 mins operation left).
3. SYNC button: For frequency pairing with receiver.
4. LCD: Displays channel number & battery level.
5. Battery Compartment
6. Grille: Protects the microphone capsule and helps reduce breath sounds and wind noise.