Motorola Ht750 Detailed Service Manual
. HT750 MTX850 MTX8250 HT1250 MTX850.LS MTX8250.LS HT1250.LS HT1250.LS+ MTX950 HT1550.XLS MTX9250 Portable Radios Professional Radio Basic Service Manual Motorola, Inc. 8000 West Sunrise Boulevard 68P80906Z54-D Fort Lauderdale, Florida 33322. Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive license to use that arises by operation of law in the sale of a product. Table of Contents Foreword.ii Product Safety and RF Exposure Compliance.
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Ii Computer Software Copyrights.ii Document Copyrights. Ii Disclaimer.ii Trademarks.ii List of Figures.ix List of Tables.xi Chapter 1 Introduction.1-1 1.1 Scope of Manual.1-1 1.2 Warranty and Service Support. 3.2.2 Cleaning Procedures.3-1 3.3 Safe Handling of CMOS and LDMOS Devices. 3-2 3.4 Repair Procedures and Techniques — General.3-2 3.5 Disassembling and Reassembling the Radio — General.3-3 3.6 Detailed Radio Disassembly.3-4 3.6.1 Front Cover from Chassis Disassembly. 3-4 3.6.2 Chassis Assembly/Disassembly.
3.8.16 HT1550.XLS Exploded View Parts List.3-30 3.8.17 MTX950 Exploded View. 3-31 3.8.18 MTX950 Exploded View Parts List.3-32 3.8.19 MTX9250 Exploded View. 3-33 3.8.20 MTX9250 Exploded View Parts List.3-34 3.9 Service Aids. 3-35 3.10 Test Equipment.3-36 3.11 Configuring and Wiring the Programming/Test Cable. 6.3 Error Codes - PassPort.6-3 6.4 Operation Display Codes.6-3 Chapter 7 Accessories.7-1 7.1 HT750/HT1250/HT1250.LS/HT1250.LS+/HT1550.XLS/MTX850/MTX950/ MTX850.LS/MTX8250/MTX9250/MTX8250.LS Accessories.7-1 7.1.1 Antennas.7-1 7.1.2 Carrying Accessories.7-2 7.1.3 Carry Cases.
7-2 7.1.4 Chargers.7-3 7.1.5 Vehicular Accessories. 8.12 800 MHz (Privacy Plus).8-11 8.13 900 MHz (Privacy Plus).8-12 8.14 Specifications, HT750 Radio.8-13 8.15 Specifications, HT1250 Radio.8-15 8.16 Specifications, HT1250.LS Radio.8-17 8.17 Specifications, HT1550.XLS Radio.8-19 8.18 Specifications, MTX850/MTX8250 (800 MHz), MTX950/MTX9250 (900 MHz) Radios. LIST OF FIGURES Figure 3-1: Battery Removal.3-4 Figure 3-2: Knob Removal.3-4 Figure 3-3: Chassis Removal. 3-5 Figure 3-4: Unlatch Flex Connectors. 3-5 Figure 3-5: Remove Main Board from Chassis.3-6 Figure 3-6: Remove Retainer.3-7 Figure 3-5: Removing the Keypad Retainer and Other Boards from the Radio. LIST OF TABLES Table 1-1: Radio Model Number (Example: AAH25KDC9AA3AN).1-4 Table 3-11: Service Aids.
3-35 Table 3-12: Recommended Test Equipment.3-36 Table 4-1: Test Environments (Side Button 1).4-4 Table 4-2: Test Environments (Models with “G” in location 10 of model number EX: AAH25RCH6GB6AN). In instances where the product is covered under a “return for replacement” or “return for repair” warranty, a check of the product should be performed prior to shipping the unit back to Motorola. This is to ensure that the product has been correctly programmed or has not been subjected to damage outside the terms of the warranty.The Customer Care and Services Division (CCSD) was formerly known as the Accesso- ries and Aftermarket Division (AAD). Motorola Online: Motorola Online users can access our online catalog at To register for online access, please call 800-814-0601.
For service, contact the Service Depot in your area. If your area does not have a depot, please contact your Business Development Manager, Distributor, or contact Motorola Technical Support. When contacting Motorola Technical Support, keep the product model number and the unit’s serial number handy. Introduction Radio Model Information The model number and serial number are located on a label attached to the back of your radio. You can determine the RF output power, frequency band, protocols, and physical packages. The example below shows one portable radio model number and its specific characteristics.
Table 1-1:Radio Model Number (Example: AAH25KDC9AA3AN) Type of Model. Do not disassemble an FMRC Approved Product unit in any way that exposes the internal electrical circuits of the unit. Radios must ship from the Motorola manufacturing facility with the Intrinsically Safe, hazardous atmosphere capability and FM Approval labeling. Radios will not be “upgraded” or converted to Intrinsically safe, and or labeled in the field, after it has been shipped from the manufacturing location. Intrinsically Safe Radio Information Modifications can only be made by the original product manufacturer (Motorola) at one of its FM audited manufacturing facilities. Failure to use an FMRC Approved portable radio unit with an FMRC Approved battery or FMRC Approved accessories. Intrinsically Safe Radio Information 2.2.3 Do Not Substitute Options or Accessories The Motorola communications equipment certified by Factory Mutual is tested as a system and consists of the FM Approved portable, FM Approved battery, and FM Approved accessories or options, or both.
This FM Approved portable and battery combination must be strictly observed. There must be no substitution of items, even if the substitute has been previously Approved with a different Motorola communications equipment unit. Intrinsically Safe Radio Information Notes.
Chapter 3 Maintenance Introduction This chapter provides details about the following: Preventive maintenance (inspection and cleaning) Safe handling of CMOS and LDMOS devices Disassembly and reassembly of the radio Installation of Optional Retrofit Kit Installation of Option Boards Preventive Maintenance The radios do not require a scheduled preventive maintenance program. When damaged parts are replaced, identical parts should be used.
If the identical replacement part is not locally available, check the parts list for the proper Motorola part number and order the part from the nearest Motorola Communications parts center listed in the “Piece Parts” section of this manual. If a unit requires more complete testing or service than is customarily performed at the basic level, send this unit to a Motorola Authorized Service Center.
(See Chapter, section 1.2.4 Technical Support on page 1-3 for a list of authorized service centers.) The following disassembly procedures should be performed only if necessary: section 3.6.2 Chassis Assembly/Disassembly on page 3-6. Maintenance Detailed Radio Disassembly 3.6.1 Front Cover from Chassis Disassembly 1. Turn off the radio. Remove the battery: a. Pull down on the two battery-release buttons. With the buttons pulled down, the top of the battery will fall from the radio. Maintenance 4.
Separate the chassis from the internal electronics front cover assembly as follows: a. Insert a small, 3/16” flat-blade screwdriver, or similar instrument, in between the thin remaining wall and the chassis at the bottom of the radio. Do not mar the O-ring sealing area on the housing. Maintenance NOTE: At this point, if necessary, the DTMF Retrofit Kit Procedure can be performed. (See section 3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure) on page 3-12).
3.6.2 Chassis Assembly/Disassembly 1. If disassembly of the chassis or the main board is required, then use a TORX™ screwdriver with a T6 head to remove the four screws holding the main board to the chassis. Maintenance 3. To remove the keypad retainer shield: a. Insert the tip of a “penknife size,” flat blade screwdriver in the opening at the end of the keypad retainer arm tab. Pry the tab away from the side of the front cover until it moves past the ledges on the side wall.
Maintenance Retainer Display Module Keypad Option Board Keypad Radio Body Figure 3-5: Removing the Keypad Retainer and Other Boards from the Radio NOTE: At this point, the Option Board Installation Procedure should be performed, if necessary. (See page 3-13) 3.6.4 Speaker, Microphone, and Universal Connector Flex Disassembly 1.
Maintenance 6. After the universal connector tail of the speaker-microphone assembly is removed, the assembly can be completely removed. If it is necessary to replace the speaker or microphone, or both, do it while the flex circuit is removed from the front cover. When reassembling the microphone in its boot, make sure the microphone port faces the round hole in the bottom of the boot. 3-10 Maintenance Detailed Radio Reassembly 3.7.1 Control Top Reassembly 1. Replace transmit light pipe and control top seal. Peel off the liners from a new control top escutcheon and place it in the recess in the front cover.
Press the control top escutcheon firmly against the adhesive. 3.7.2 PTT Reassembly 1. Maintenance 3-11 Catches Retainer Figure 3-8: Lock Retainer Catches to the Radio’s Body 3.7.5 Chassis Assembly Reassembly 1. Slide on the ground contact (if it was removed) on the top corner boss of the chassis. Replace the O-ring. The tabs on the O-ring should reach into the chassis and point down. 3-12 Maintenance 8.
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Reassemble the knobs, dust cover, antenna, and battery. Radio Chassis Figure 3-9: Fastening the Chassis 3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure) If you are performing an upgrade from a basic model to a DTMF model, replace the existing front cover kit with kit number HLN9984 and follow the reassembly steps to reassemble the upgraded radio.
Maintenance 3-13 NOTE: The CPS may display a warning dialog box when you attempt to write the codeplug back to the radio. It is safe to ignore this warning.
Press the OK button. 3.7.8 Option Board Installation 1.
With the keypad retainer removed the keypad backer board can be removed without the use of tools. 3-14 Maintenance Notes. 3-29 3.8.15 HT1550.XLS Exploded View 30 31 33 34 Figure 3-19: HT1550.XLS Exploded View.
3-30 3.8.16 HT1550.XLS Exploded View Parts List Table 3-8. HT1550.XLS Parts List (Continued) Table 3-8. HT1550.XLS Parts List Motorola Part Item Description Number Motorola Part Item Description Number 6062884K01 Backup Battery See Section 7 in Antenna 0304726J04 Screw manual 3980667Z01. Table 3-11 lists service aids recommended for working on the HT750/HT1250/HT1250.LS/ HT1250.LS /HT1550.XLS/MTX850/MTX950/MTX850.LS/MTX8250/MTX9250/MTX8250.LS radios. NOTE: While all of these items are available from Motorola, most are standard shop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed. 3-36 Test Equipment 3.10 Test Equipment Table 3-12 lists test equipment required to service the HT750/HT1250/HT1250.LS/HT1250.LS HT1550.XLS/MTX850/MTX950/MTX850.LS/MTX8250/MTX9250/MTX8250.LS radios.
Table 3-12:Recommended Test Equipment Motorola Part Description Characteristics Application R2000, R2600 Service Monitor This monitor will Frequency/deviation meter and sig- R2400, or R2001. Configuring and Wiring the Programming/Test Cable 3-37 3.11 Configuring and Wiring the Programming/Test Cable Block Figure 3-22: Programming/Test Cable AARKN4074 Figure 3-23: Pin Configuration of the Cable Side Connector. 3-38 Configuring and Wiring the Programming/Test Cable TO RADIO TO RADIO UNIVERSAL TEST SET CONNECTOR RLN4460 EXT SPKR + AUDIO - EXT SPKR - AUDIO + OPTION B+ EXT MIC MIC AUDIO OPT SEL 2 OPT SEL 1 RX DATA VOL CTRL TX DATA DISC.
Chapter 4 Transceiver Performance Testing General These radios meet published specifications through their manufacturing process by utilizing high accuracy laboratory-quality test equipment. The recommended field service equipment approaches the accuracy of the manufacturing equipment with few exceptions.
This accuracy must be maintained in compliance with the manufacturer’s recommended calibration schedule. Transceiver Performance Testing 8. Press ‘side button 1’ at the end of the Icon Test to activate the button test. Pressing any side button (except ‘side button 1’), or any keypad button during the LCD test or Icon test immediately activates this test. A good button press is verified by a chirp.
Transceiver Performance Testing 14. Press HOME, view “129/1”; release, view “129/0”. Press , view “130/1”; release, view “130/0”. Press Option Select1, view “135/1”; release, view “135/0”.
Press Option Select2, view “136/1”; release, view “136/0”. Press Option Select3, view “137/1”; release, view “137/0”. Transceiver Performance Testing Annunciators Figure 4-3: Two-Line Display Annunciators Test Mode Information, Line 2 Figure 4-4: Four-Line Display (HT1550 XLS).
Table 4-1: Test Environments (Side Button 1) Number of Side No. Of Display Description Function Button 1 Beeps Shows Presses Initial (No but- Carrier. Transceiver Performance Testing Table 4-2: Test Environments (Models with “ ” in location 10 of model number EX: AAH25RCH6GB6AN) Item No. Of Description Function Beeps Carrier Squelch RX: unsquelch if carrier detected TX: mic audio Tone RX: unsquelch if carrier and tone (192.8Hz) detected Private-Line TX: mic audio + tone (192.8Hz) Digital. Transceiver Performance Testing Test Frequencies for Display and Non-Display Radios The radio channels and test frequencies are listed in Table 4-4. The channels are selected using the channel selector switch located on top of the radio, as shown in Figure 4-1 on page 4-3.
The test environment and channel spacing for any particular frequency is selected using ‘side buttons 1 and 2’, as listed in Table 4-1 on page 4-4 and Table 4-2 on page 4-5. Transceiver Performance Testing Receiver Performance Tests The receiver and transmitter performance tests are contained in Table 4-5 and Table 4-6 respectively. Refer to Chapter 5, Figure 5-1 on page 5-2, for test equipment setup. Note that all test measurements ° °. Transceiver Performance Testing Table 4-6: Transmitter Performance Checks (Models with ”G” in location 10 of model number EX:AAH25RDH9GB6AN) Test Service Monitor Radio Test Set Comments Name Reference Mode: PWR MON TEST MODE, PTT to continu- Frequency error Frequency 4th channel test frequency. Test Channel ous (during the ±200 Hz VHF.
Chapter 5 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions Introduction This chapter provides an overview of the Customer Programming Software (CPS) and tuner program designed for use in a Windows NT, Windows 95, Windows 98, Windows 2000, and Windows ®. Figure 5-1: Radio Tuning Test Equipment Setup 5.2.1 Initial Test Equipment Setup The supply voltage is connected to the radio using a Motorola battery eliminator, P/N AA0180305G54. The initial test equipment (Figure 5-1) control settings are listed in Table 5-2. Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions CPS Programming Setup The CPS programming setup, shown in Figure 5-2, is used to program the radio codeplug. NOTE: Refer to appropriate program on-line help files for the codeplug programming procedures. Radio Test Box Battery. Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions source radio produces a “clone-exit” tone and displays “Clone Complete”.
Turn both radios off. Disconnect the cloning cable from both radios and turn them on for normal operation.
On/Off Knob Side Button 1. Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions WARNING: Do NOT turn off the radio or disconnect it from the computer while attempting to PROGRAM the codeplug. Interrupting the programming process WILL DESTROY the code- plug contents and completely DISABLE the radio W A R N I N G Procedure. 11 9/16 (29.369 cm) 11 7/16 (29.052 cm) 4. To replace the antenna cap, put a small bead NOTE: of #414 Loctite™ (Motorola part number 1110019B59) 10 5/8 (26.988 cm) Antenna length 10 (25.400 cm) around the inside walls of the antenna cap.
Place measured from 9 3/8 (23.813 cm). Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions HT1250 PassPort Tone Options. In order to provide more detailed information about the radio’s state to a user or service technician various Tones and Display options are available. One Tone option is a short low pitched tone that sounds whenever the radio loses contact for any reason with its registered PassPort site and begins to search for another site. Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions the “.” key for the decimal point, enter the desired Search Frequency in MHz.
Press the Select key when the entry is complete or the Escape/Exit Key to exit the function without entering a search frequency. Chapter 6 Power Up Self-Test Error Codes - Conventional and LTR Radios Turning on the radio starts a self-test routine that checks the RAM, ROM checksum, EEPROM hardware, and EEPROM checksum. If these checks are successful, the radio generates two high- pitched self-test pass tones, or a musical tone (selected in CPS). Power Up Self-Test Error Codes - Privacy Plus At power-up, the radio performs cursory tests to determine if its basic electronics and software are in working order. Problems detected during these tests are presented as error codes on the radio display.
Power Up Self-Test Error Codes - PassPort For the purpose of this document the phrase “PassPort Trunking Controller Board” and its acronym “PTCB” are used. Table 6-3: Power-up Display Codes (PassPort Trunking Controller Board) If the error code then, there is To correct the problem. Power Up Self-Test Notes. Chapter 7 Accessories HT750/HT1250/HT1250.LS/HT1250.LS /HT1550.XLS/MTX850/ MTX950/MTX850.LS/MTX8250/MTX9250/MTX8250.LS Accessories 7.1.1 Antennas 136-174 MHz, Ferrule Connector PMAD4012 136-155 MHz, Stubby PMAD4013 155-174 MHz, Stubby PMAD4014 14 cm. Helical, Standard Length - 136-155 MHz (Red Code) PMAD4015 14 cm. Helical, Standard Length - 155-174 MHz (Black Code) PMAD4023 14 cm. Accessories 7.1.2 Carrying Accessories All Models/All Battery Chemistries: HLN9952 Carry Holder, Belt Clip-One size fits all HLN9714 Spring 2-1/2” Belt Clip HLN9701 Nylon Carry Case with Beltloop 7.1.3 Carry Cases HT750, MTX850, MTX950, Ultra-High and High Capacity Battery Carry Cases MTX850.LS (Standard Model Only) HLN9665 Standard Leather Case, Beltloop.
Accessories 7.1.4 Chargers AAHTN3000 120V Rapid Rate Single Unit Charger Kit, U.S. 3-Prong Plug (includes Xfmr, pocket, spacer, model box, and NA/LA manual) HTN9000 Rapid Rate Single Unit (Pocket Only) 25-04548T05 120V Transformer Only AAHTN3003 120V Multi-Unit Rapid Rate Charger, U.S. 3-Prong Plug (includes line cord and NA/LA manual) NLN7967 Wall Mount Kit for Multi-unit Charger. Accessories 7.1.9 Service Aids H5177 Customer Programming Software (CPS) - 3 Years Subscription (Conventional, PrivacyPlus, LTR, and PassPort) RKN4073 Cloning Cable, portable Professional Radio Only AARKN4074 Programming/Test Cable (requires RIB box) RKN4075 Programming cable (includes internal Rib) 0180305G54 Shop battery eliminator cable. Requires RLN4510A (7.5 volt source) RLN4510 7.5 Volt Universal Battery Eliminator.
Accessories 7.1.11 Option Boards (All option boards below are not compatible with HT1550.XLS) AAHLN9729 DTMF Decode Option Board with Manual (Field Install Only) 6881088C24 DTMF Decode Installation Sheet AAHLN9725 Voice Storage Option Board with Manual 6881088C22 Voice Storage User Manual AAENLN4150 Mandown board for HT1250 All option boards include the installation user manual. Accessories Notes.
Chapter 8 Model Chart and Test Specifications UHF 403–470 MHz (Conventional) HT Series, UHF, 403–470 MHz Model Description AAH25RDC9AA2N HT750, 403-470 MHz, 4W, 4-Ch AAH25RDC9AA3N HT750, 403-470 MHz, 4W, 16-Ch AAH25RDG9AA4N HT750, 403-470 MHz, 4W, 16-Ch, DTMF AAH25RDG9AA5N HT1250, 403-470 MHz, 4W, 128-Ch, Display AAH25RDH9AA6N HT1250, 403-470 MHz, 4W, 128-Ch, DTMF, Display AAH25RDC9AA2NFD. Model Chart and Test Specifications UHF 450–512 MHz (Conventional) HT Series, UHF, 450–512 MHz Model Description AAH25SDC9AA2N HT750, 450-512 MHz, 4W, 4-Ch AAH25SDC9AA3N HT750, 450-512 MHz, 4W, 16-Ch AAH25SDG9AA4N HT750, 450-512 MHz, 4W, 16-Ch, DTMF AAH25SDG9AA5N HT1250, 450-512 MHz, 4W, 128-Ch, Display AAH25SDH9AA6N HT1250, 450-512 MHz, 4W, 128-Ch, DTMF, Display AAH25SDC9AA2NFD.
Model Chart and Test Specifications UHF 403–470 MHz (LTR and PassPort) HT Series, UHF, 403–470 MHz (LTR & PassPort) Model Description AAH25RDH9DP7N HT1250.LS, LTR/PassPort, LTD KPD, MDC/Conventional AAH25RDH9DP9N HT1250.LS, LTR/PassPort, DTMF, MDC/Conventional AAH25RDH9DU5N HT1250.LS, LTR 4W, LTD KPD, Display AAH25RDH9DU6N HT1250.LS, LTR, 4W, DTMF, Display AAH25RDH9DP5N. Model Chart and Test Specifications UHF 450–512 MHz (LTR and PassPort) HT Series, UHF, 450–512 MHz (LTR & PassPort) Model Description AAH25SDH9DP7N HT1250.LS, LTR/PassPort, LTD KPD, MDC/Conventional AAH25SDH9DP9N HT1250.LS, LTR/PassPort, DTMF, MDC/Conventional AAH25SDH9DU5N HT1250.LS, LTR 4W, LTD KPD, Display AAH25SDH9DU6N HT1250.LS, LTR, 4W, DTMF, Display AAH25SDH9DP5N. Model Chart and Test Specifications UHF 403–470 MHz (Conventional/LTR) HT Series, UHF, 403–470 MHz (Conventional/LTR) Model Description AAH25RDN9DU8N HT1550.XLS, 403-470 MHz, 4 Watt, 160 Channel Item Description X PMLE4215 HT1550.XLS Back Cover Kit (403-470 MHz) X PMLN4218 HT1550.XLS Front Housing Kit X NAE6483 Whip Antenna (403-520 MHz) X 6881093C95. Model Chart and Test Specifications UHF 450–512 MHz (Conventional/LTR) HT Series, UHF, 450–512 MHz (Conventional/LTR) Model Description AAH25SDN9DU8N HT1550.XLS, 450-512 MHz, 4 Watt, 160 Channel Item Description X PMLE4216 HT1550.XLS Back Cover Kit (450-512 MHz) X PMLN4218 HT1550.XLS Front Housing Kit X NAE6483 Whip Antenna (403-520 MHz) X 6881093C95.
Model Chart and Test Specifications VHF 136–174 MHz HT Series, VHF, 136–174 MHz Model Description AAH25KDC9AA2N HT750, 136-174 MHz, 5W, 4 -Ch AAH25KDC9AA3N HT750, 136-174 MHz, 5W, 16 -Ch AAH25KDG9AA4N HT750, 136-174 MHz, 5W, 16 -Ch, DTMF AAH25KDF9AA5N HT1250, 136-174 MHz, 5W, 128 -Ch AH25KDH9AA6N HT1250, 136-174 MHz, 5W, 128 -Ch, DTMF, Display AAH25KDC9AA2NFD. Model Chart and Test Specifications VHF 136–174 MHz (Conventional/LTR) HT Series, VHF, 136–174 MHz (Conventional/LTR) Model Description AAH25KDF9DU5N HT1250.LS, 136-174 MHz, 5W, Limited Keypad (Ltd Kpd) AAH25KDF9DU7N HT1250.LS, 136-174 MHz, 5W, Ltd Kpd, MDC/Conventional AAH25KDH9DU6N HT1250.LS, 136-174 MHz, 5W, DTMF AAH25KDH9DU9N HT1250.LS, 136-174 MHz, 5W, DTMF, MDC/Conventional AAH25KDN9DU8N.
Model Chart and Test Specifications VHF, 136–174 MHz (LTR & PassPort) HT Series, VHF, 136–174 MHz (LTR & PassPort) Model Description AAH25KDF9DP5N HT1250LS, 136-174 MHz, 5W, 16CH Limited Keypad AAH25KDF9DP7N HT1250LS, 136-174 MHz, 5W, 32CH Limited Keypad w/MDC AAH25KDH9DP6N HT1250LS, 136-174 MHz, 5W, 16CH Full Keypad. 8-10 Model Chart and Test Specifications 8.10 LowBand 29.7–42/35–50 MHz HT Series, Lowband, 29.7–42/35–50 MHz Model Description AAH25BEC9AA3N HT750, 29.7-42 MHz, 6W, 16 -Ch AAH25CEC9AA3N HT750, 35-50 MHz, 6W, 16 -Ch AAH25BEF9AA5N HT1250, 29.7-42 MHz, 6W, 128-Ch, Display AAH25CEF9AA5N HT1250, 35-50 MHz, 6W, 128-Ch, Display AAH25BEC9AA3NFD HT750, 29.7-42 MHz, 6W, 16 -Ch AAH25CEC9AA3NFD. Model Chart and Test Specifications 8-11 8.11 800 MHz (LTR) MTX Series, 806–866 MHz (LTR) Model Description AAH25UCH6DU9N MTX8250.LS, 2.5W, MDC/Conventional (Display) AAH25UCC6DU3N MTX850.LS, 2.5W, 16-Ch (Non-Display) AAH25UCH6DU6N MTX8250.LS, 2.5W, 190-Ch (Display) Item Description PMUF1125 MTX8250.LS Back Cover Kit (MDC/Conventional) PMLF4012 MTX850.LS Back Cover Kit PMLF4013.