C8LB635050W VHF Ground to air transmitter

T6T Transmitter User Guide Issue 1 Handbook Title:T6T Transmitter User Guide Handbook Part Number:31-360000TX Issue Number:1 Date of Issue:November 1999 Published By:Park Air Electronics Northfields Market Deeping Peterborough England PE6 8UE Telephone:From UK,01778 345434 From outside UK, 44 1778 345434 Fax:From UK,01778 342877 From outside UK, 44 1778 342877 Page ii Handbook Amendment Record Amendments to this handbook, originated by Park Air Electronics, are listed in the following table. Amendment Number DateBrief Details PAE Change Note Number Equipment Modification Record Modifications to the T6T transmitter are detailed in the following table. The equipmentís modification label shows modifications embodied in the equipment. Modification Number DateBrief Details PAE Change Note Number Page iii List of Abbreviations The following abbreviations are used in this user guide: Page iv Aamp AMamplitude modulation BITbuilt-in test dBdecibel DSPdigital signal processing ETIelapsed time indicator ICAOinternational civil aviation organisation kgkilogram kHzkilo Hertz LCDliquid crystal display mAmilliamp MARC multi-access remote control system MHzmega Hertz mmmillimetre ppmparts per million PSKphase shift keying rmsroot mean square RSSIreceiver signal strength indication Vvolt VFPvirtual front panel VHFvery high frequency T6T Transmitter User Guide Section 1 General Information Section 1T6T Transmitter User Guide Page 2 Section 1 Contents Chapter 1.Overview Introduction to the T6T Transmitter3 T6T Handbooks3 Operational Settings4 Virtual Front Panel5 Built-In Tests5 Transmitter Variants6 Configuring the T6T Transmitter6 Chapter 2.Specification Dimensions and Weight9 RF Characteristics9 Environmental10 Power Requirements10 Chapter 3.Controls, Indicators, and Connectors Front Panel11 Transmit Indicator11 Alarm Indicator11 Ready Indicator11 Standby Indicator12 Reference Connector12 Microphone/Diagnostics Connector12 Scroll/Select Switch and LCD13 Rear Panel14 Power Switch14 AC Input Connector14 DC Input Connector15 Fuse F115 Chassis Stud Connection15 Facilities Connector CN515 MARC Port CN616 Computer Port CN716 Antenna Connector16 Chapter 4.Installation Procedures Introduction21 Initial Inspection of the Transmitter22 Fitting the Correct AC Input Fuse22 Selecting the Correct AC Input Tap23 Selecting the Keying Method24 Fitting a Radio into an Equipment Rack25 Connecting Remote Facilities25 Chassis Stud Connection26 AC Supply Connection26 DC Supply Connection27 Connecting an Antenna27 Switching On27 Page Chapter 1.Overview This chapter provides an introduction to the T6T transmitter, briefly describes the features, and shows how the radio is configured for operational use. INTRODUCTION TO THE T6T TRANSMITTER Park Air Electronics (PAE) T6T is a VHF multi-mode air-traffic control transmitter compatible with analogue (AM) and digital (D8PSK) modulation modes. Current models are supplied programmed for AM voice operation in the frequency range 118 to 136.975 MHz using 25 kHz or 8.33 kHz channel spacing. Future software upgrades will allow D8PSK operation. The transmitter produces a 50 watt carrier output that can be reduced, in 1 watt steps, to 5 watts. The output power, and the majority of operational settings, can be selected at the front panel, using the virtual front panel (VFP) or through a compatible control and data system such as the PAE multi-access remote control (MARC) system. A multi-channel feature allows up to 100 frequency channels to be stored and recalled by channel number. The transmitter is designed to be fitted in an industrial 19 inch (483 mm) equipment rack. Operation is from either a standard ac mains supply, or from a low voltage dc supply. When both input supplies are connected, the dc supply acts as a back-up if the mains supply fails. Comprehensive continuous and interruptive Built-In Tests (BIT) provide confidence of the transmitter's serviceability. T6T HANDBOOKS This user guide describes the T6T transmitter and gives complete installation and setting up procedures. The user guide is split into sections as follows: Section 1.Section 1 (this section) provides general information that is common to all operating modes. Section 2.Section 2 provides information that is specific to operating the T6T transmitter in AM-voice mode. Section 3.Section 3 onwards will, when available, describe the digital operating modes. A maintenance kit (PAE part number 70-6350MKIT) is also available. A maintenance handbook, included in the kit, contains fault finding guides to module level and details VFP operation. The VFP can be used for setting up, maintenance purposes, and for loading new software. The maintenance kit includes a CD-ROM containing the VFP software and a lead for connecting the radio to a Personal Computer (PC). The CD-ROM also contains the software as loaded into the T6T at the time of sale. This enables the original software to be re-loaded if the transmitter's Digital Signal Processing (DSP) module is ever replaced. Both the user guide and maintenance handbook are available on CD ROM. Contact PAE for details. T6T General InformationSection 1 Page 3 T6T transmitter maintenance should not be attempted without reference to the maintenance handbook OPERATIONAL SETTINGS Operational settings for the T6T transmitter are configured at the front panel, through the VFP, or through an associated MARC system (or compatible control and data system). At the transmitter, operational settings are selected and displayed using the front panel Scroll/Select switch and the LCD. The settings are selected through a series of menus. Full details are given in the section of this user guide applicable to the operating mode. Two example selection menus, Set Frequency menu and Channel Storage menu, are shown below. 121 . 500MHz Cance lOK Ch100121 . 500MHz Cance l Store Storeand End During normal transmitter operation, the Main screen, shown below, is displayed. The screen shows the operating frequency,…

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PAE T6T Transmitter M odel B6350 C8LB6350 FCC Application Page 1 of 1T6T Block Diagram Mi cr opr ocessor Super H FPGA Xi l i nx DSP 2 DSP 1 D/ A DAC Ser i al Dat a At t enuat or MUXMUX At t enuat or I ( I F AGC) BI T I M oni t or Q ( RF AG C) BI T Q Moni t or I Q Modul at or I Q De- modul at or Synt hesi ser Fr equency Tr i m Nar r ow/ Wi de BI T Synt h Lock RF Dr i ve PA Cont r ol Faci l i t i es 6 A LAW CODEC Si det one/ Headset Dr i ve Loudspeaker Amp. Dr i ve At t enuat or Audi o Li nes Fl ags/ SPORT 0 SPORT 8 Tr ansm i t Recei ve Dr i v er s Li ne Cl ock Cont r ol l er Pr ot ocol Tr ansm i t Recei ve RS422 Cl ock RS232 Dr i v er s/ HDLC 8 Addr ess Dat a ROM RAM 1 6 Base St at i on Li nk Ser i al 0 Ser i al 1 6 RS232Dr i v er s Dr i v er s RS422 Tr ansm i t / Recei ve Dat a Tr ansm i t / Recei ve Dat a Tr ansm i t / Recei ve Dat a MARC I nt er f ace DSP Boar d Comput er Por t 83 Dat a Cont r ol LC D Modul e Fr ont PanelLEDs Mi c PTT, Mi c Audi o Mi c I nput Di agnost i cs I nt er f ace Mi cr ophone, Headset / Di agnost i cs Fr ont Panel Tunabl e Fi l t er s Fi l t er RF Out put RF PA Fan Fan Cont r ol GA10032 I ssue 2T6 Ser i es Appr oved PN 30- 09- 98 T6T Overal l Bl ock Di agr am C hecked GR 30-09- 98 Bi as Ref l ect ed Power PA Temper at ur e BI T Cont r ol SPO RT Recei ver s Encoder Rot ar y PSU 0Vac Det ect dc Det ect - 15V +15V+5VUnr eg Out put Loudspeaker Tape Out put 34

Northfields, Market Deeping, Peterborough, PE6 8UE, England. Tel: +44 (0) 1778 345434 Fax: 342877 Sales Fax: 341286 www.parkair.co.uk Registered in England 1951792 An ISO9001 Approved Company A subsidiary of Northrop Grumman Corporation 20 March 2000 Federal Communications Commission Equipment Approval Services P.O. Box 358315 Pittsburgh PA 15251-5315 USA Dear Sirs, Please find enclosed an application for Type Acceptance of a transmitter under Part 87 rules. This equipment is a VHF AM (6K00A3E) transmitter model number B6350 for ground to air communication use in licensed installations. Should you require further information in support of this application please do not hesitate to contact me. Yours faithfully, Allan Horsfield Principal Engineer EMC and Approvals Message: Commercial, in Confidence

Northfields, Market Deeping, Peterborough, PE6 8UE, England. Tel: +44 (0) 1778 345434 Fax: 342877 Sales Fax: 341286 www.parkair.co.uk Registered in England 1951792 An ISO9001 Approved Company A subsidiary of Northrop Grumman Corporation 15 March 2000 Federal Communicatio ns Co mmission Equipment Approval Services PO Box 358315 Pittsb urgh PA 15251-5315 Reference: C8LB6350 731 Confirmation No. Request for Confidentiality Dear Sir or Madame, Park Air Electronics respectfully requests that all circuit diagrams provided for this application should be regarded as Company Confidential and not made available to third parties. The product includes advanced digital signal processing technology w hich ensures the Company remains a world leader in this field of communications. Yours faithfully, Allan Horsfield Principal Engineer EMC and Approvals

PAE T6T Transmitter Model B6350 C8LB6350 FCC ApplicationPage 1 of 1 ---------------------------------------------------------------------------------------------------------------------------------------------- ------ LIST OF EXHIBITS EXHIBIT AFCC Identification label position illustration Photograph of equipment ; front view Photograph of equipment ; rear view Photograph of equipment ; internal view - top Photograph of equipment ; internal view - bottom Photographs of DSP module EXHIBIT BTest Report for FCC Type Acceptance EXHIBIT CEquipment Block Diagram EXHIBIT DOperators User Guide and Technical Specification EXHIBIT ECircuit Diagrams EXHIBIT FSales leaflet

FAA Notification of FCC Type Acceptance Application for PAE B6350. General FCC NumberC8LB6350 ManufacturerPark Air Electronics Ltd. England. Type T6T VHF transmitter Model NumberB6350 RF Output Power50 Watts Antenna port50R N-type connector Frequency range118 MHz to 136.975 MHz. Method of tuningFrequency selected by front panel control and LCD display. Channelling capability25 kHz and 8.33kHz. Emission bandwidthWithin FCC limits see attached report summary Emission type6K0A3EJN Emission/harmonicsSee attached report summary Description Park Air Electronics (PAE) T6T is a VHF multi-mode air-traffic control transmitter compatible with analogue (AM) and digital (D8PSK) modulation modes. Current models are supplied programmed for AM voice operation in the frequency range 118 to 136.975 MHz using 25 kHz or 8.33 kHz channel spacing. Future software upgrades will allow D8PSK operation. The transmitter produces a 50-watt carrier output that can be reduced, in 1 watt steps, to 5 watts. The output power, and the majority of operational settings, can be selected at the front panel, using the virtual front panel (VFP) or through a compatible control and data system such as the PAE multi-access remote control (MARC) system. A multi-channel feature allows up to 100 frequency channels to be stored and recalled by channel number. The transmitter is designed to be fitted in an industrial 19 inch (483 mm) equipment rack. Operation is from either a standard ac mains supply, or from a low voltage dc supply. When both input supplies are connected, the dc supply acts as a back-up if the mains supply fails. Comprehensive continuous and interruptive Built-In Tests (BIT) provide confidence of the transmitter's serviceability. PAE B6350 VHF transmitter emission performance summary: All results taken from report number CTMS 2000/1221 produced by Cambridge Test and Measurement Services * and submitted to the FCC supporting our application for Grant of Equipment Authorisation. Occupied Bandwidth - 47 CFR 2.1049 (1) Spurious emissions at antenna terminals - 47 CFR 2.1051 Results in accordance with Part 2.1051 and 87.139 Emission Limits Note: Emissions 20dB below limit are not required to be listed Carrier Frequency (Fc) : 127.5 MHz Absolute Level Level (relative to RF Power 50W) dB w.r.t limit of 43+10 log power Frequency (MHz) Identity dBmdBcRemarks limit - 13limit - 60 255.002Fc-48dBm-95dBc 382.503FC-43dBm-90dBc 637.504Fc-65dBm-112dBc All greater than 20dB within Specification Limit. * FCC Registration Number 93395 Field Strength of Spurious radiation - 47 CFR 2.1053 Carrier Frequency (Fc) : 127.5 MHz Absolute Level Level (relative to RF Power 50W) dB w.r.t limit of 43+10 log power Frequency (MHz) Identity dBmdBc Remarks limit - 13limit - 60 225.002Fc-64-111 510.004Fc-68-116 All greater than 20dB within Specification Limit.

PARKAIRELECTRONICST6T VHF TRANSMITTER Description 50W Digital Multimode Transmitter PARKAIRELECTRONICS FEATURES Analogue and Digital programmable modulation modes AM voice with 25 kHz and 8.33 kHz channel spacing AM-MSK for Mode 1 (ACARS) D8PSK for Mode 2 (CSMA) and Mode 3 (TDMA) Five carrier offset capable 50 W Continuous duty operation Compact 2U high rack mounting package Class leading RF performance Static and dynamic BIT The T6 Series represent the latest generation of Park Air ATC radios which are designed for professional applications in airport and en-route centres. The T6 Series fulfils both analogue (AM) modulation and the future digital (D8PSK) modes, which are being planned by ICAO. The T6 Series makes extensive use of advanced DSP (digital signal processing) technology to enable the transition from analogue to digital modulation modes to be made via software upgrade. Investment in radio systems is thereby protected against obsolescence as new digital modulation waveforms are introduced. The T6T operates in the VHF aviation band and provides both 25KHz and 8.33KHz channel spacing. Frequency offsets can be set on 25KHz channels to enable the transmitter to operate in offset carrier area coverage systems and a 100-channel memory is incorporated for recall of pre-set frequency and operating modes in multichannel applications. Modulation waveforms are implemented using DSP algorithms, which provide consistent long term performance. D8PSK digital modulation waveforms require highly linear power amplifiers to achieve spectral purity, and the T6T employs a sophisticated feedback technique to ensure class leading RF performance. The power amplifier is designed for continuous operation for maximum reliability. Sophisticated DSP algorithms combined with conservatively rated components ensure the T6 Transmitter has class leading performance in the areas of distortion and low level spurious products. To minimise interference effects, the transmitter is designed to meet and exceed international targets for reduced spectral noise in the aviation band. Control of transmitter operating parameters can be effected locally using a menu driven front panel LCD or remotely via serial ports on the rear panel. All transmitter adjustments are under software control and can be accessed externally avoiding any necessity to remove covers during the operational life of the equipment. Should software updates be required to support new modulation modes in the future, these can be simply effected via a front panel diagnostic port or remotely via rear panel serial ports. The T6T has comprehensive BIT which monitors both static (supplies etc) and dynamic (power output, modulation etc) parameters. Results can be viewed on the front panel LCD and are summarised via READY and ALARM indicators. All BIT data is available for remote monitoring via the serial ports and transmitters can be readily networked for remote monitoring using PAE MARC or similar systems. The transmitter is a compact 2U high, 19” rack mounted unit. Power can be 110/220 VAC or 24/28 VDC, with automatic switching to DC in the event of an AC failure. Both inputs are fully filtered and protected. Specification 50W Digital Multimode Transmitter PARKAIRELECTRONICST6T VHF TRANSMITTER UK HEAD OFFICE: Northfields, Market Deeping, Peterborough, PE6 8UE, England. Tel + 44 1778 345434 Fax + 44 1778 341286 USA: Tel +1 410 349 8629 Fax +1 410 349 1846 FAR EAST: Tel +603 706 4898 Fax +603 706 4775 Email: [email protected] Web site: www.parkair.co.uk Park Air Electronics Ltd is a subsidiary of Northrop Grumman PARKAIRELECTRONICS General Characteristics Frequency range 117.975 to 136.975 MHz Channel spacing 25 KHz and 8.333 kHz Programmable channels 100 Frequency offsets ±4KHz, 5KHz, 7.3KHz and 8KHz to comply with ICAO offset carrier requirements Frequency error ±1 ppm (option 0.3 ppm) Modulation mode AM voice AM-MSK D8PSK Mode 2 and Mode 3 Power supplies ac: 110/120/220/240 V (±10%),45 to 65 Hz 330 VA typical, <500 VA max dc: 21.4 to 32 V <12 A Environmental Operating: -20 to +55 degrees C Storage: -30 to +70 degrees C Duty cycle Continuous EMC/EMI 89/336/EEC Weight/Dimensions Width:483 mm (19 inches) Height:2U/89 mm (3.5 inches) Depth:419 mm (16.5 inches) Weight:17 kg RF Characteristics Carrier power Adjustable from 5 to 50 W in 1 W steps Mismatch load Full power into 2.5:1 VSWR, infinite VSWR without damage Harmonic outputs -80 dBc Spurious outputs AM -90dBc D8PSK -54dBm in 25KHz BW Tx timeout Adjustable 2 to 510 secs in 2 sec increments or can be disabled for continuous operation Modulation Characteristics (AM) Response 25KHz channel spacing 300 Hz to 3.4 KHz +1/-3 dB ref 1 kHz >20 dB attenuation at 100 Hz >30 dB attenuation at 5 kHz Response 8.33KHz channel spacing 350 Hz to 2.5KHz +2/-4 dB ref 1 kHz >45 dB attenuation at 3.2 kHz Modulation depth Up to 95% Distortion <5% THD at 90% modulation AGC (VOGAD) <10% change in 90% modulation depth for 30dB change in input level Mute Adjustable to open from -40 dBm at line input Audio inputs 600 ohm balanced line input adjustable -30 dBm to +10 dBm 600 ohm front panel microphone input Tape 600 ohm tape/sidetone output -10dBm Front Panel Facilities: Rotary Encoded Switch and back lit 4-line LCD provide simple menu driven control of all transmitter operating parameters and BIT functions LED indicators for standby, ready, alarm and transmit Combined microphone and Virtual Front Panel (VFP) connector PTT activation via menu or microphone (AM) Recessed co-axial connector for monitoring internal reference oscillator Rear Panel Facilities: Antenna N-type female connector Supply connectors ac and dc supply connectors with associated fuses Facilities connector 15-way D-type includes audio, control, and BIT connections Data connector 25-way D-type used to link transmitter to control computer when operating in digital modes. Provides two RS422 synchronous HDLC interfaces for status/ control and transmission data plus real…

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Northfields, Market Deeping, Peterborough, PE6 8UE, England. Tel: +44 (0) 1778 345434 Fax: 342877 Sales Fax: 341286 www.parkair.co.uk Registered in England 1951792 An ISO9001 Approved Company A subsidiary of Northrop Grumman Corporation Thursday, 20 April 2000 Mr. Frank Coperich. Federal Communication Commission Equipment Authorization Division Applications Processing Branch 7435 Oakland Mills Road Columbia MD21046 REF: C8LB6350 731 Confirmation Number EA97106 Correspondence Reference Number:13487 Dear Mr. Coperich, The mobile radio in question will only be marked in the USA as a 25kHz version. References to 8.33kHz channel spacing apply to our European customers. Consequently we feel we were incorrect in applying for operation under the emission designator 5K00A3E and would ask that this designator be deleted from our application. In order to clarify the FCC position we propose to add the following words to the User guide: Notice for the USA: FCC Statement This device complies with Part 15 of the FCC rules. Operation is subject to the condition that this device does not cause harmful interference. This equipment is only licensed for operation on 25kHz channel spacing. Operation on 8.33 kHz channel spacing is restricted to European customers. This statement will be added to page ii of the User Guide. I hope this is acceptable to allow us to procceed. Please also note we have a parallel application for a complementary receiver under C8LB6100 (EA97191) and these changes apply to this application also. Best regards, A. Horsfield EMC and Approvals

Northfields, Market Deeping, Peterborough, PE6 8UE, England. Tel: +44 (0) 1778 345434 Fax: 342877 Sales Fax: 341286 www.parkair.co.uk Registered in England 1951792 An ISO9001 Approved Company A subsidiary of Northrop Grumman Corporation Friday, 28 April 2000 Mr. Frank Coperich. Federal Communication Commission Equipment Authorization Division Applications Processing Branch 7435 Oakland Mills Road Columbia MD21046 REF: C8LB6350 731 Confirmation Number EA97106 Correspondence Reference Number:13616 Dear Mr. Coperich, Further to your statement regarding the use of the FCC identifier I can confirm that the equipment label as submitted will only be applied to equipment sold in the US and Canada. These equipment’s will be set for 25kHz operation only. All ot her sales will use a similar label with the FCC identifier removed. Best regards, A. Horsfield EMC and Approvals

Exhibit AFCC ID C8LB6350Page 1 EXHIBIT A Model number label and location Exhibit AFCC ID C8LB6350Page 2 EXHIBIT A Photographs (Note further photographs may be found in the test report – Exhibit B) Front view Rear View Note: The identification label shown will be replaced by the one show n at the beginning of this section Exhibit AFCC ID C8LB6350Page 3 Top View Exhibit AFCC ID C8LB6350Page 4 Bottom view Exhibit AFCC ID C8LB6350Page 5 RF Power amplifier DSP Module

EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 1 of 26 TEST REPORT ON Park Air VHF AM Transmitter FCC Authorization Procedures Part 2 subpart J and part 87 TEST REPORT NUMBER CTMS 2000/1221 January 2000 Prepared for: Park Air Electronics Ltd. Bleheim Way, Northfields, Market Deeping, Peterborough, Lincolnshire PE6 8UE This results in this report refer to the tested unit only EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 3 of 26 General Test Information Date Test Sample Received : 18 th January 2000 Date Testing Started : 19 th January 2000 Date Testing Finished : 20 th January 2000 Equipment Serial Number : 2003 CTMS Project Number : 2000/1221 Test Engineer : M. Billis Report Copy No EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 4 of 26 TABLE OF CONTENTS PAGE No Part 2.1033 Application for Certification 5 2.1046 RF Power Output at terminals 6 2.1047 (a) Modulation Characteristics 7 2.1047 (b) Modulation limiting characteristic 8 2.1049 (1) Occupied Bandwidth 9 2.1051 Spurious emissions at antenna terminals 10, 11 2.1053 Field Strength of spurious radiation 12 2.1053 (a) (1) Frequency Stability with temperature variation 14 2.1053 (d) (1) Frequency Stability with primary voltage variation 15 2.1057 Frequency spectrum to be investigated 16 General Information and Attachments : Company Accreditations & Credentials 26 EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 5 of 26 2.1033 Application for Certification For use in accordance with FCC Rules and Regulations 47 CFR parts 2 and parts 87. 2.1033 (c) (1) Name of applicant : Park Air Electronics Ltd. Address of applicant : Bleheim Way, Northfields, Market Deeping, Peterborough, Lincolnshire PE6 8UE Contact : Mr. A. Horsfield 2.1033 (c) (2) FCC Identifier : C8L B6350 Model Type Number : T6T/B6350 2.1033 (c) (3) Installation and operating instructions : User Guide, see exhibit D 2.1033 (c) (4) Type(s) of emission : Amplitude Modulated 6K80A3EJN,5K00A3EJN 2.1033 (c) (5) Frequency range : 118 -136.975 MHz 2.1033 (c) (6) Output power range : 50 W 2.1033 (c) (7) Maximum power rating (part 87) : 50 W 2.1033 (c) (8) dc voltage applied to power amplifier : 26.0 V dc current to power amplifier : 7.5 A 2.1033 (c) (9) Tune-up procedure for RF power : n/a 2.1033 (c) (10) Schematic and description of circuit/devices for : see exhibit D & E Stabilizing frequency : see exhibit D & E Suppression of spurious radiation : see exhibit D & E Limiting modulation : see exhibit D & E Limiting Power : see exhibit D & E 2.1033 (c) (11) Photograph of identification plate / label : See exhibit ëAí 2.1033 (c) (12) Photographs of equipment : See pages 17-25 EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 6 of 26 RF Power Output at terminals - 47 CFR 2.1046 The transmitter is operated under standard test conditions, using the standard test voltage, the transmitter, tuned in accordance with the procedure described in the accompanying documentation, was keyed in an unmodulated condition and the output was connected to a RF Power Meter via an attenuator of normal impedance matching that of the transmitter. The RF Power Output was observed and recorded. The RF Power Output was measured in accordance with the following test configuration, using the test instruments listed. (Calibrated items are indicated in Blue) Test instruments used : RF Power Meter : Hewlett Packard Type HP 435B RF Power Sensor : Hewlett Packard Type HP 8481B Results in accordance with Part 2.1046 and 87.131 Power and emissions TRANSMITTER POWER (Watts) 118.0 MHz 127.5 MHz 136.975 MHz 52.5 W 55.5 W 56.0 W EUT Power Sensor Power Meter EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 7 of 26 Modulation Characteristics - 47 CFR 2.1047 (a) The transmitter is operated under standard test conditions and the output monitored with a modulation analyzer via an attenuator of normal impedance matching that of the transmitter. A test signal of 1000Hz sine wave is applied to the normal input to the modulation circuit to the audio processing circuits, the level adjusted to give 30% depth of modulation. Ensuring the audio input level is maintained constant, the modulation frequency is varied from 100Hz to 10,000Hz. The variation in the depth of modulation is observed and recorded. The modulation characteristic was measured in accordance with the following test configuration, using the test instruments listed. (Calibrated items are indicated in Blue) . Test instruments used : RF Attenuator : Bird 30dB, 100W Type 8323 AF Oscillator : Hewlett Packard Audio Analyser Type HP 8903B AC Voltmeter : Hewlett Packard Audio Analyser Type HP 8903B Modulation Analyzer : Hewlett Packard Modulation Analyser Type HP 8901B Results in accordance with Part 2.1047(a) and 87.141 Modulation Requirements : see attachment 1 EUT Atten- uator Modulation Analyser AF Oscillator AC Voltmeter EQUIPMENT : T6T/B6350 TEST REPORT NUMBER: CTMS 2000/1221A FCC Identifier : C8L B6350 CTMS FCC Registration Number : 93385 Page 8 of 26 Modulation Limiting Characteristics - 47 CFR 2.1047 (b) The transmitter is operated under standard test conditions and the output monitored with a modulation analyzer via an attenuator of normal impedance matching that of the transmitter. A test signal of 1000Hz sine wave is applied to the normal input to the modulation circuit to the audio processing circuits, the input level is varied between -50dBm to + 10dBm and the variation in the depth of modulation is observed and recorded. The test was repeated with the test modulation frequency of 300Hz and 3000Hz. The mo…

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