P9CFMT-25

FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: FMT-25 VHF FM TRANSLATOR TECHNICAL MANUAL FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: FMT-25 VHF FM TRANSLATOR TECHNICAL MANUAL CONTENTS: 1. Introduction 2. General Description 3. Technical Specifications 4. Operating Information 5. Installation Information 6. Technical Information 7. Maintenance information FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: INTRODUCTION This Manual contains the Operating, technical and installation information for the FMT- 25 VHF FM Translator. The FMT-25 forms part of a new range of Professional VHF FM Re-broadcasting equipment produced by Broadcast Solutions Electronics. FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: FMT-25 VHF FM TRANSLATOR TECHNICAL MANUAL General Description FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: GENERAL DESCRIPTION The FMT- 25 VHF FM Translator is a compact unit requiring only 1U Rack space. The unit is designed for use in VHF FM Stereo Broadcasting in the 87.5MHz to 108MHz, band. The unit will perform the function of a “Relay receiver” and “25W FM Exciter”, providing Local (Display) and Remote (Telemetry) functions. The FMT- 25 offers standard features that include: • Automatic tuning of Rx Front-end filters. • Fully synthesized in 50kHz steps (Tx and Rx). • Rx Diversity operation capability. • A/C and DC (+24V) operation. • ALC for RF Power control. • Telemetry output. • Rx Headphone output. • RF Monitor output. • Comprehensive metering and indicators. The FMT- 25 offers a range of customer options that include: • ID Module for internal SCA insertion. The FMT- 25 provides a High quality, compact and versatile solution for VHF FM Re- broadcasting and only requires 1U rack space. The unit includes a fully synthesized FM Receiver with Front-end tracking filters and a highly selective Ceramic IF Filter. A Tracking demodulator and 100kHz Low pass filter are also standard features of the receiver section. The unit also includes a fully synthesized FM Modulator with provision for internal and external Baseband inputs. The FMT- 25 has a 25-Watt RF Power amplifier module with integral SMPSU. Low pass RF Filter and couplers are standard on this module. The FMT- 25 is equipped with a +24V dc input, which can be used for Battery/Solar- powered operation or as back up for mains failure condition. The dc input is internally fused for protection purposes. The rectified a/c input is also fused internally, while the a/c mains input is fused on the rear panel. The schematic diagram of the FMT-25 is shown in figure 2 below. 3. STRUCTURE. The FMT- 25 comprises of the following modules. a) Display PCB (378-Z0028). b) Main PCB (378-Z0027). c) RF PA Module (980801). FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: d) PSU Module (980808). Each module is Field replaceable, in line with BSE’s maintenance philosophy. This allows the customer to change a module, or to upgrade options easily. 4. FUNCTIONAL DESCRIPTION. Refer to the Front and Rear panel layout in figure 1. 1) RF monitor (BNC 50 ohms female). 2) Rx Headphone monitor (Stereo ¼ inch Jack socket). 3) Tx indicators and alarms. 4) Bargraph meter (20 dot). 5) Bargraph meter function selector (Selects one of four metered parameters). 6) Tx Power adjustment (potentiometer). 7) PSU / Rx indicators and alarms. 8) Power on/off switch: Switches a/c (Mains) and dc (+24V) supplies. 9) A/C Mains input Europlug (IEC) connector for a/c supply. 10) Ext. 24V dc input: Positive (+) and negative (-) dc binding terminals. 11) A/C Mains Fuse: Fuse (1Amp/230V or 2A/115V). 12) Ground: M5 Screw for chassis ground. 13) Telemetry: D15 (female) connector for remote commands and alarms. 14) RF Output (N Type 50 ohm female). 15) Tx Auxiliary baseband input (BNC female for SCA/SST Sub-carrier injection). 16) Tx Baseband input (BNC female for composite/MPX injection). 17) Rx Baseband output (BNC female for Rx composite/MPX output). 18) Input Receiver (BNC 50 ohms female for received RF input). FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: Figure 1: Front and Rear panel layout. FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: Figure 2: Schematic Diagram of FMT-25 FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: FMT-25 VHF FM TRANSLATOR TECHNICAL MANUAL Technical Specifications FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: FMT- 25 SPECIFICATIONS Electrical characteristics Typical Rx Sensitivity: 75kHz-deviation reference with 75uS de-emphasis (Stereo) RF Input level Stereo S/N ratio 20uV 50dB 50uV 56dB 100uV 60dB 500uV 70dB 1000uV 75dB Rx Static selectivity: RF Filter, IF Filter and Rx baseband filter Frequency offset Selectivity ± 100kHz 0dB ± 200kHz -65dB ± 300kHz -90dB ± 400kHz -100dB ± 500kHz -110dB Rx Dynamic selectivity: 75kHz deviation reference and 75uS de-emphasis for 54dB S/N ratio (Stereo). Frequency offset Selectivity 0kHz -46dB ± 100kHz -30dB ± 200kHz +6dB ± 300kHz +27dB ± 400kHz +35dB Rx baseband amplitude response: Frequency Response 30Hz to 53kHz ± 0.1dB 53kHz to 95kHz ± 1dB ≥200kHz ≤ -65dB FMT- 25 VHF FM TRANSLATOR 862-09725 Issue 1A: Rx baseband performance: Stereo with 75kHz deviation and de-emphasis off. Tested at 1mV, RF input. Frequency Distortion Separation Crosstalk 30Hz ≤ 0.25% ≥ 50dB ≥ 50dB 1kHz ≤ 0.25% ≥ 50dB ≥ 50dB 5kHz ≤ 0.25% ≥ 50dB ≥ 50dB 15kHz ≤ 0.25% ≥ 50dB ≥ 45dB Tx baseband amplitude response: Input via Tx baseband input. Frequency Response 1Hz - 3dB 30Hz to 53kHz ± 0.1dB 53kHz to 100kHz ± 0.25dB Tx baseband performance: Stereo with 75kHz deviation. Tested with FM Stereo demodulator and decoder. Frequency Distortion Separation Crosstalk 30Hz ≤ 0.15% ≥ 50dB ≥ 50dB 1kHz ≤ 0.15% ≥ 50dB ≥ 50dB 5kHz ≤ 0.25% ≥ 50dB ≥ 50dB 15kHz ≤ 0.25% ≥ 50dB ≥ 50dB General Tx/Rx specifications: Tx/Rx Frequency range 87.5MHz to 108MHz Tx/Rx Frequency separation ≥400kHz Tx/Rx Frequency increments 50kHz steps (synthesized) Tx/Rx Frequency stability ± 2ppm Tx RF Output power ≥25W (Adjustable via front panel) Tx Harmonics and spurious ≤ -60dBc Tx out of lock attenuation ≥ 70dB Tx…

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P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION Attestation Statement

P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION Cover Letter

P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION External Photo

P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION Internal Photo

FMT-25 FM Translator 862-90002 P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION General Description INTRODUCTION The FMT-25 FM Translator forms part of a new range of Professional FM Broadcast Equipment manufactured by Broadcast Solutions Electronics (Pty) Ltd. Coupled with the BSE range of exciters, the units provide a comprehensive translator product. 1. The FMT-25 provides a compact, synthesized, high selectivity FM off-air receiver for professional rebroadcast applications. The unit includes a high quality “front end” PCB with tracking filters and PIN attenuator to ensure exceptional performance. A highly selective ceramic I.F. filter is used in conjunction with a tracking demodulator to ensure maximum selectivity and superior audio performance. The FMT-25 provides outputs for MPX (composite base band to 100kHz) and stereo audio left and right, via a high quality stereo decoder. The metering facilities are provided on the front panel for monitoring of the incoming signal quality. The receiver includes a diversity facility where two receivers can be used in a main and standby combination with automatic changeover should the main unit fail. This facility is built into the receiver as standard. 3. STRUCTURE. The Translator comprises of the following modules. a) Front End & Synthesizer PCB. b) 100kHz I.F. Filter PCB c) Demodulator and Control PCB. d) Display module PCB. Each module is Field replaceable, in line with BSE’s maintenance philosophy. This allows the customer to change a module, or to upgrade options easily. 4. FEATURES. The FMT-25 has standard features including the following; a) Remote/Internal frequency selection (standard). b) Remote telemetry with voltage free contacts (standard). c) +24V Battery operation (standard). d) Wideband outputs (MPX) with stereo audio outputs. e) Comprehensive metering on the front panel. f) High selectivity (300kHz adjacent channel operation). g) Comprehensive protection built in. h) Automatic front end tuning 5. BLOCK DIAGRAM DESCRIPTION. Refer to the Front panel layout and Rear panel controls and connectors in figure 1, and the Block diagram of FMT-25 in Figure 2 FMT-25 FM Translator 862-90002 Figure 1: Front panel layout and rear panel connectors and functions FMT-25 FM Translator 862-90002 Figure 2: Block Diagram of FMT-25

P9CFMT-25 Technical Data for FCC Certification Active Devices and Function List Translator Main PCB #654-Z0027 DEVICETYPEFUNCTION BB405BDiodeVariable Capacitance BAT83/85DiodeSchottky Rectifier 1N4004DiodeRectifier PMLL4148DiodeSmall Signal Switching BB809DiodeVariable Capacitance BYV27-200Diode200V Fast Recovery BYV10-60DiodeSmall Signal Schottky BB804DiodeVariable Capacitance BBY40DiodeVariable Capacitance TUF-1DiodeMixer BF245ATransistorSmall Signal JFET BC550ATransistorSmall Signal PN2222ATransistorSmall Signal PN2907ATransistorSmall Signal J309TransistorJFET BFR93TransistorWideband 74HC132NICQuad 2 I/P Schmitt Trigger 74HC74NICDual Positive Edge Trigger LF353NICDual Op Amp LM358NICDual Op Amp LM2575-HVTICStep-down Voltage Regulator 7805IC+5V Regulator 79L12IC-12V Regulator LM317TIC+5V Adj Voltage Regulator TL064NICQuad Op Amp TL071CPICSingle Op Amp U893BSEICPre-scaler TDA1591V3ICStereo Decoder MSA0886ICRF Amplifier MC14151DW2ICPLL Synthesizer TDA1576ICFM Demodulator TL062NICDual Op Amp Crystal10MHz TCXO P9CFMT-25 Technical Data for FCC Certification Active Devices and Function List Translator Display PCB #654-Z0028 DEVICETYPEFUNCTION 1N4148DiodeSmall Signal Switching PN2222ATransistorSmall Signal PN2907ATransistorSmall Signal 74HC4052CNIC4 Channel Analog Multiplier 4510BEICBCD Counter LM3914ICLinear Bargraph Display Driver TL064NICQuad Op Amp 78L05IC+5V Regulator 78L12IC+12V Regulator Translator Power Amplifier PCB #654-Z0029 DEVICETYPEFUNCTION PMLL4148DiodeSmall Signal Switching BYV28-200Diode200V Fast Recovery Rectifier MRF136YTransistor30W MOSFET MRF134Transistor5W MOSFET LM2576TICAdj Voltage Switching Regulator MAV11ICRF Amplifier Tune-up and Adjustment Procedure for FMT-25 Translator Test Equipment (Minimum Requirements) TYPE MANUFACTURER 1. RF Signal Generator R & S SMG 2. Modulation Analyser R & S FAM 3. Spectrum Analyser H.P. 8590B 4. RF Power Meter Bird 43 5. RF Attenuator 50W/30dB Bird 6. Stereo Encoder R & S MSC2 7. Stereo Decoder R & S MSDC2 8. Audio Analyser R & S UPA3 9. Oscilloscope Tektronix FMT-25 TEST SET-UP FMT-25 Translator User Test and Alignment Procedure The equipment supplied has been inspected and tested in accordance with the factory procedures. A test report has been supplied with the equipment and adjustments other than Tx and Rx frequency changes are not normally required. The following adjustments can be made to optimize the performance of the equipment by using the prescribed list of test equipment (or similar alternatives). Test procedure and adjustments 1. Connect equipment as shown in test set-up. 2. Rx frequency selection The Rx frequency is set via “SW2” on the main PCB 378-Z0027. The frequency is set using a 12 bit binary code (see tables in manual). Select the required frequency. 3. Tx frequency selection The Tx frequency is set via “SW3” on the main PCB 378-Z0027. The frequency is set using a 12 bit binary code (see tables in manual). Select the required frequency. 4. The highlighted references indicate the “user” adjustments that are allowed the others are factory set. FMT-25 Switch-on Sequince a) Switch “ON” the FMT-25 and adjust the RF power to 25Watts via the “PWR ADJ” control on the front panel b) Check the RF frequency displayed on the “modulation analyzer” is the same as the Tx selected frequency. c) The TCXO (IC7) on the main PCB 378-Z0027 can be adjusted if necessary to achieve this. d) Check spectrum analyzer for harmonics and spurious (60dBc) 5. Rx and Tx calibration (modulation). a) Set the RF signal generator to the selected “Rx Frequency” with 1mV level. Set the deviation to 75kHz and the modulating frequency to 400Hz. Observe the Rx baseband output at (SK5) on the oscilloscope and ensure a level of 3.5p-p is shown. R111 on main PCB 378-Z0027 can be adjusted to achieve this if necessary. b) Check the peak deviation on the modulation analyzer is 75kHz. R182 on the main PCB 378-Z0027 can be adjusted to achieve this. c) Check the “MONO” distortion on the modulation analyzer is 0.25% fine adjustment of C96 on the main PCB 378-Z0027 can be adjusted to achieve this if necessary. d) Select “field” on the front panel multimeter and ensure a reading of 1mV. Adjust R1 if necessary on the display PCB 378-Z0028 to achieve this. e) Select “Baseband” on the front panel meter and ensure a reading of 1.2V. Adjust R4 on the display PCB 378-Z0028 to achieve this. f) Select “FORWARD” on the front panel multimeter and ensure a reading of 24W (with the RF output power adjusted to 24W). Adjust R2 on the display PCB 378-Z0028 to achieve this. g) The “Reflected” power adjustments are factory set and should not be adjusted by the user. 6. Rx and Tx calibration (stereo) a) Apply a “STEREO MPX” signal to the RF signal generator from the stereo encoder (via the ext DC input) and ensure 75kHz deviation with 10% pilot. Select “LEFT” channel only and observe the stereo signal on the stereo decoder (Left channel) and on the audio analyzer. Select the right channel on the stereo decoder and measure the channel separation L→R while checking the distortion on the left channel. Check the performance at the following frequencies. Frequency Separation Distortion 40Hz ≥50dB 0.25% 100Hz ≥50dB 0.25% 500Hz ≥50dB 0.25% 1kHz ≥50dB 0.25% 5kHz ≥50dB 0.25% 15kHz ≥50dB 0.25% The following adjustments can be made. Adjust C109 on main PCB 378-Z0027 for best separation at 1kHz adjust R92 on main PCB 378-Z0027 for best separation at 15kHz. 7. a) Adjust the RF power to the required level (normally 24W – 26W). Ensure that no “Red Leds” are indicating fault conditions on the front panel. The unit is now ready for installation.

P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION Test Report and Test Diagram

P9CFMT-25 25W FM TRANSLATOR TECHNICAL DATA FOR FCC CERTIFICATION Test Setup Photos