
NGT—Technical description (2011/2012)
110
NGT Transceiver System Technical Service Manual
RF unit—Application Processor Handset I/F 3 V PCB (2011)/Application
Processor Handset & Data I/F PCB (2012) transmit path
The transmit audio goes to IC7 pin 2. This audio interface device contains an ADC and a
DAC.
The analog transmit audio is sampled and converted by IC7 into digital format. A
compression function is applied to the digital audio as shown in
Figure 21: Representation of compression function by IC7
The decay time constant is controlled by firmware and can be varied depending on the
type of transmission. For example, for speech, the time constant needs to be short, but for
data it needs to be lengthened to improve the BER.
The DAC outputs of IC7 pins 8 and 9 are summed together in IC8/A to produce an
output of 1 V p–p. This output then goes via the Audio & Interconnect PCB
(2011)/Audio Interconnect & Data I/O PCB (2012) to the RF/IF PCB.
The output level, which is controlled by firmware, is halved when AM is transmitted or
low power is selected.
RF unit—RF/IF PCB transmit path
Transmit/Receive switching
The PTT command from the handset causes IC408 to drive pins 12 and 13 (Rx Switch
and Tx Switch). This switches off V415 and V416 and switches on V417 and V418, thus
c10 VTx to be active. This switches all circuits to the Transmit mode.
2011: Drawing
2012: Drawing
NOTE
If the PCB issue status is -06 or earlier, see drawing
.
Input Level
Output Level
1 V
200 mV
2 V
Содержание NGT 2010 RF
Страница 87: ...03 01032 Issue 2 ...
Страница 88: ...03 01032 Issue 4 ...
Страница 97: ...03 01126 ...
Страница 98: ...03 01190 ...
Страница 234: ...NGT Parts lists 200 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 428: ...04 03223 ...
Страница 429: ...04 03562 CODAN ...
Страница 430: ...04 03437 ...
Страница 431: ...04 03533 ...
Страница 432: ...08 05513 ...
Страница 433: ...08 05514 sheet 1 ...
Страница 434: ...08 05514 sheet 2 ...
Страница 435: ...08 05628 sheet 1 ...
Страница 436: ...08 05628 sheet 2 ...
Страница 437: ...08 05628 sheet 3 ...
Страница 438: ...08 05628 sheet 4 ...
Страница 439: ...04 03125 ...
Страница 440: ...08 05300 ...
Страница 441: ...08 05522 ...
Страница 442: ...08 05523 ...
Страница 443: ...08 05524 ...
Страница 444: ...04 03201 ...
Страница 445: ...08 05470 ...
Страница 446: ...04 03423 ...
Страница 447: ...08 05986 sheet 1 ...
Страница 448: ...08 05986 sheet 2 ...
Страница 449: ...04 03133 ...
Страница 450: ...08 05317 ...
Страница 451: ...04 03109 ...
Страница 452: ...08 05266 ...
Страница 453: ...04 03108 sheet 1 ...
Страница 454: ...04 03108 sheet 2 ...
Страница 455: ...08 05265 ...
Страница 456: ...04 03106 sheet 1 ...
Страница 457: ...04 03106 sheet 2 ...
Страница 458: ...04 03106 sheet 3 ...
Страница 459: ...08 05261 sheet 1 ...
Страница 460: ...08 05261 sheet 2 ...
Страница 461: ...04 03095 ...
Страница 462: ...08 05235 ...
Страница 463: ...04 03378 sheet 1 ...
Страница 464: ...04 03378 sheet 2 ...
Страница 465: ...04 03378 sheet 3 ...
Страница 466: ...04 03378 sheet 1 ...
Страница 467: ...04 03378 sheet 2 ...
Страница 468: ...04 03378 sheet 3 ...
Страница 469: ...08 05889 sheet 1 ...
Страница 470: ...08 05889 sheet 2 ...
Страница 471: ...08 05889 sheet 1 ...
Страница 472: ...08 05889 sheet 2 ...
Страница 473: ...04 03410 ...
Страница 474: ...04 03414 ...
Страница 475: ...08 05963 ...
Страница 476: ...08 05962 ...
Страница 477: ...08 05973 ...
Страница 478: ...04 03169 ...
Страница 479: ...08 05415 ...
Страница 480: ...08 05416 ...
Страница 481: ...08 05511 sheet 1 ...
Страница 482: ...08 05511 sheet 2 ...
Страница 483: ...04 03369 ...
Страница 484: ...08 05869 sheet 1 ...
Страница 485: ...08 05869 sheet 2 ...
Страница 486: ...08 05869 sheet 3 ...
Страница 487: ...08 05910 sheet 1 ...
Страница 488: ...08 05910 sheet 2 ...
Страница 489: ...04 03542 ...
Страница 490: ...08 06461 sheet 1 ...
Страница 491: ...08 06461 sheet 2 ...
Страница 492: ...08 06461 sheet 3 ...
Страница 493: ...08 05910 sheet 1 ...
Страница 494: ...08 05910 sheet 2 ...
Страница 495: ...04 03425 ...
Страница 496: ...08 05988 sheet 1 ...
Страница 497: ...08 05988 sheet 2 ...
Страница 498: ...04 03424 sheet 1 ...
Страница 499: ...04 03424 sheet 2 ...
Страница 500: ...08 05987 ...
Страница 501: ...04 03499 sheet 1 ...
Страница 502: ...04 03499 sheet 2 ...
Страница 503: ...08 06261 sheet 1 ...
Страница 504: ...08 06261 sheet 2 ...
Страница 505: ...04 03498 sheet 1 ...
Страница 506: ...04 03498 sheet 2 ...
Страница 507: ...08 06260 ...
Страница 508: ...04 03379 ...
Страница 509: ...08 05890 ...
Страница 510: ...15 10506 001 ...
Страница 511: ...15 10514 001 ...
Страница 512: ...04 03110 ...
Страница 513: ...08 05267 ...
Страница 514: ...04 03514 ...
Страница 515: ...08 06320 ...
Страница 516: ...04 03272 ...
Страница 533: ...03 01138 ...
Страница 534: ...03 01139 ...
Страница 560: ...High power Parts lists 246 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 604: ...04 03422 ...
Страница 605: ...08 05985 ...
Страница 606: ...04 03419 ...
Страница 607: ...08 05997 ...
Страница 608: ...04 03420 ...
Страница 609: ...08 05999 ...
Страница 610: ...04 03416 ...
Страница 611: ...08 05977 sheet 1 ...
Страница 612: ...04 03428 ...
Страница 613: ...08 05998 ...
Страница 614: ...04 03429 ...
Страница 615: ...08 06000 ...
Страница 616: ...04 03415 ...
Страница 617: ...08 05976 sheet 1 ...
Страница 618: ...08 05976 sheet 2 ...
Страница 619: ...04 03418 sheet 1 ...
Страница 620: ...04 03418 sheet 2 ...
Страница 621: ...08 05979 sheet 1 ...
Страница 622: ...08 05979 sheet 2 ...
Страница 623: ...04 03417 ...
Страница 624: ...08 05978 sheet 1 ...
Страница 625: ...08 05978 sheet 2 ...
Страница 626: ...08 05978 sheet 3 ...
Страница 627: ...04 03421 ...
Страница 628: ...08 05984 ...
Страница 629: ...04 03453 ...
Страница 630: ...08 06067 sheet 1 ...
Страница 631: ...08 06067 sheet 2 ...
Страница 632: ...08 06102 sheet 1 ...
Страница 633: ...08 06102 sheet 2 ...
Страница 634: ...04 03377 ...
Страница 635: ...08 05926 sheet 1 ...
Страница 636: ...08 05926 sheet 2 ...
Страница 637: ...04 03407 ...
Страница 638: ...08 05927 sheet 1 ...
Страница 639: ...08 05927 sheet 2 ...
Страница 653: ...NRI Brief description 260 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 654: ...03 01079 ...
Страница 680: ...NRI Fault finding 286 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 682: ...NRI Parts lists 288 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 699: ...NRI Drawings 290 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 700: ...04 03363 sheet 1 ...
Страница 701: ...04 03363 sheet 2 ...
Страница 702: ...08 05854 sheet 1 ...
Страница 703: ...08 05854 sheet 2 ...
Страница 704: ...08 05854 sheet 3 ...
Страница 705: ...04 03364 ...
Страница 706: ...08 05855 ...
Страница 707: ...04 03370 ...
Страница 708: ...08 05870 ...
Страница 720: ...3012 Brief description 300 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 721: ...03 01080 ...
Страница 723: ...3012 Brief description 302 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 737: ...3012 Parts lists 316 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 748: ...3012 Drawings 318 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 749: ...04 03366 sheet 1 ...
Страница 750: ...04 03366 sheet 2 ...
Страница 751: ...08 05860 sheet 1 ...
Страница 752: ...08 05860 sheet 2 ...
Страница 753: ...04 03367 ...
Страница 754: ...08 05861 ...
Страница 770: ...8571 Brief description 332 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 771: ...03 01108 ...
Страница 801: ...8571 Parts lists 362 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 825: ...8571 Drawings 364 NGT Transceiver System Technical Service Manual This page has been left blank intentionally ...
Страница 826: ...08 05994 sheet 1 ...
Страница 827: ...08 05994 sheet 2 ...
Страница 828: ...04 02541 ...
Страница 829: ...08 03905 ...
Страница 830: ...04 02690 ...
Страница 831: ...08 03993 ...
Страница 832: ...04 02691 ...
Страница 833: ...08 05995 ...
Страница 834: ...04 02852 ...
Страница 835: ...08 04644 ...
Страница 836: ...04 02487 ...
Страница 837: ...08 03817 ...
Страница 838: ...08 03995 ...