Eclipse Ser ies RF Technology rfinfo@rftechnology.com.
CONTENTS CONTENTS Contents 1 Oper ating Instr uctions 1.1 Fr ont Panel Contr ols and Indicator s 1.1.1 PTT 1.1.2 Line 1.1.3 PWR LED 1.1.4 TX LED 1.1.5 ALARM LED 5 5 5 5 6 6 6 2 Tr ansmitter Inter nal J umper Options 2.1 JP2: EPROM type 2.2 JP3: Dc Loop PTT 2.3 JP4: Audio Input Source 2.4 JP6: Input Level Attenuation 2.5 JP7: Audio Response 2.6 JP8: Sub-audible Tone source 2.7 JP9/10/11: dc Loop Configuration 7 7 7 7 7 8 8 8 3 Tr ansmitter I/O Connections 3.
CONTENTS CONTENTS 7 Specifications 7.1 Over all Descr iption 7.1.1 Channel Capacity 7.1.2 CTCSS 7.1.3 Channel Programming 7.1.4 Channel Selection 7.1.5 Micro-processor 17 17 17 17 17 17 18 7.2 Physical Configur ation 18 7.3 Fr ont Panel Contr ols, Indicator s and Test Points 7.3.1 Controls 7.3.2 Indicators 7.3.3 Test Points 18 18 18 19 7.4 Electr ical Specifications 7.4.1 Power Requirements 7.4.2 Frequency Range and Channel Spacing 7.4.3 Frequency Synthesizer Step Size 7.4.
CONTENTS CONTENTS A Engineer ing Diagr ams A.1 Block Diagram A.2 Circuit Diagrams A.
1 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to continual improvement and RF Technology reserves the right to change performance and specification without further notice. 1 Oper ating Instr uctions 1.1 Fr ont Panel Contr ols and Indicator s 1.1.
1.
2 TRANSMITTER INTERNAL JUMPER OPTIONS 2 Tr ansmitter Inter nal J umper Options In the following subsections an asterisk (*) signifies the standard (Ex-Factory) configuration of a jumper. 2.1 J P2: EPROM Type Condition 27C256 27C64 Position 2-3 * 1-2 2.2 J P3: Dc Loop PTT This jumper enables or disables the keying of the PTT function by means of a dc signal passed down the 600W line input pair. When enabled, JP9-JP11 control how the dc signal is configured with respect to an internal opto-coupler.
2.5 JP7: Audio Response 2.5 J P7: Audio Response Condition 750 uSec. pre-emphasis Flat response 2.6 Position 1-2 * 2-3 J P8: Sub-audible Tone Sour ce Condition Internal CTCSS External input 2.7 4 CHANNEL AND TONE FREQUENCY PROGRAMMING Position 1-2, 4-5 * 2-3, 5-6 J P9/10/11: dc Loop Configur ation These settings are only relevant when the PTT signal is to be used across the same wires as the audio. Refer to setting of JP3.
4 CHANNEL AND TONE FREQUENCY PROGRAMMING Function DC power Channel Select RS232 Data 600W Line Signal +12 Vdc 0 Vdc 1 2 4 8 10 20 40 80 In Out High Low 150W / Hybrid Direct PTT input T/R Relay driver output Sub-Audible Tone Input High-Z Audio Input [+] [-] [+] [-] External ALC input Pins 1, 14 13, 25 21 9 22 10 23 11 24 12 15 2 20 6 7 19 3 16 5 18 4 17 8 Specification +11.
5 CIRCUIT DESCRIPTION The VCO output is amplified and buffered by monolithic amplifiers MA2 and MA3 before being fed to the PLL IC U6. Amplifiers MA1, MA4 and MA5 increase the VCO output to approximately 4 mW to drive the power amplifier. MA1 is not switched on until the PLL has locked and had time to settle. This prevents any momentary off channel transmission when the transmitter is keyed. 5.
5 CIRCUIT DESCRIPTION 5.3 Power Amplifier The resulting control voltage supplies Q2 through R10, R12 and completes the power leveling control loop. 5.4 600W Line Input The 600W balanced line input connects to line isolation transformer T1. T1 has two 150W primary windings which are normally connected in series for 600W lines. The dual primary windings can be used to provide DC loop PTT signaling or a 2/4 wire hybrid connection. All four leads are available at the rear panel system connector.
5.8 Audio Signal Processing 5 CIRCUIT DESCRIPTION from U7c before it is combined with the voice audio signal in the summing amplifier U7a. Back to back diodes D4 and D5 limit the maximum tone signal amplitude to prevent excessive tone deviation when external tone sources are used. 5.8 Audio Signal Pr ocessing Jumper JP4 selects either the line or direct input source. The selected source is then connected to JP6.
5 CIRCUIT DESCRIPTION 5.10 Microprocessor Controller A bridge consisting of diodes D6, D8, D9 and D14 ensures correct operation regardless of the current polarity. Q17 limits the current and D7 limits the voltage input to ISO1. Any low voltage current source capable of providing 2 mA at 4 V or switching circuit with less than 4.8kW loop resistance can be used to switch the DC loop. The test PTT button on the front panel and the local microphone PTT button will also key the transmitter.
6 FIELD ALIGNMENT PROCEDURE 6.1 Standard Test Condition The procedures below do not constitute an exhaustive test or a complete alignment of the module, but if successfully carried out are adequate in most circumstances. TCXO calibration may be periodically required owing to normal quartz crystal aging. A drift of 1ppm/year is to be expected.
6.4 Modulation Balance 4. 6.4 6 FIELD ALIGNMENT PROCEDURE Measure the carrier frequency at the output connector, and adjust XO1 until the correct carrier frequency is measured, ±50Hz. Modulation Balance 1. Set RV3 fully counter clockwise (CCW) (sub-tone off). 2. Set RV1 fully clockwise (CW) (maximum deviation) 3. Set RV2 mid-position 4. Set JP7 for flat response 5. Key the transmitter on 6. Set the audio input to 150Hz, 0dBm. 7.
6 FIELD ALIGNMENT PROCEDURE 6.6 6.6 Deviation Deviation 1. Set RV4 (Line Level) fully clockwise (CW). 2. Set the audio to 1kHz, 0dBm, on the line input. 3. Key the transmitter on.. 4. Adjust RV1 (Set Max. Deviation) for a deviation of 5kHz (2.5kHz for narrow band transmitters). 5. Key the transmitter off. 6. Carry out the Line Input Level alignment procedure (section 6.7) 6.7 Line Input Level 1. Set the audio to 1kHz, 0dBm, on the line input, or use the actual signal to be transmitted.
7 SPECIFICATIONS 7 7.1 SPECIFICATIONS Over all Descr iption The transmitter is a frequency synthesized, narrow band FM unit, normally used to drive a 50 watt amplifier. It can also be used alone in lower power applications. Various models allow 2-25W of output power to be set across a number of UHF frequency bands. All necessary control and 600W line interface circuitry is included. 7.1.
7 SPECIFICATIONS 7.1.5 Microprocessor 7.1.5. Micr opr ocessor A microprocessor is used to control the synthesizer, tone squelch, PTT function and facilitate channel frequency programming. With the standard software, RF Technology modules also provide fault monitoring and reporting. 7.2 Physical Configur ation The transmitter is designed to fit in a 19 inch rack mounted sub-frame. The installed height is 4 RU (178 mm) and the depth is 350 mm. The transmitter is 63.5 mm or two Eclipse modules wide. 7.
7 SPECIFICATIONS 7.4 Electrical Specifications 7.4 7.4.1 Electr ical Specifications Power Requir ements Operating Voltage - 10.5 to 16 Vdc with output power reduced below 12 Vdc Current Drain - 5A Maximum, typically 0.25A Standby Polarity - Negative Ground 7.4.2 Fr equency Range and Channel Spacing Fr equency 330-365 MHz 360-380 MHz 375-400 MHz 403-420 MHz 430-450 MHz 450-520 MHz 7.4.3 25 kHz T350C T350A T350B T500A T500D T500B 12.
7 SPECIFICATIONS 7.4.8 7.4.8 Transmit Duty Cycle Tr ansmit Duty Cycle 100% to 40C, de-rating to zero at 60C. 100% to 5000ft altitude, de-rating to zero at 15,000ft. 7.4.9 Spur ious and Har monics Less than 0.25mW 7.4.10 Car r ier and Modulation Attack Time Less than 20ms. Certain models have RF envelope attack and decay times controlled in the range 200ms< tr/f <2ms according to regulatory requirements. 7.4.
7.4.16 Test Microphone Input 7 SPECIFICATIONS 7.4.16 Test Micr ophone Input 200W dynamic, with PTT 7.4.17 Exter nal Tone Input Compatible with R500 tone output 7.4.18 Exter nal ALC Input Output will be reduced 20dB by pulling the input down to below 1V. (Typically more than 40dB attenuation is available.) The input impedance is @10kW, internally pulled up to rail. The external ALC input can be connected to the power control circuit in Eclipse external power amplifiers. 7.4.
7 SPECIFICATIONS 7.4.22 7.4.22 Programmable No-Tone Period Pr ogr ammable No-Tone Per iod A No-Tone period can be appended to the end of each transmission to aid in eliminating squelch tail noise which may be heard in mobiles with slow turn off decoders. The NoTone period can be set from 0--5 seconds in 0.1 second increments. The No Tone period operates in addition to the reverse phase burst at the end of each transmission.3 7.4.
7 SPECIFICATIONS Fr equency No Tone 67.0 69.4 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.
A ENGINEERING DIAGRAMS 7.5.2 Power & I/O Connector 25-pin “D” Male Mounted on the rear panel 7.5.3 Test Connector 9-pin “D” Female mounted on the front panel A Engineer ing Diagr ams Most Eclipse transmitter modules contain two PCBs, a motherboard with the control and signal generation circuitry (the exciter board), and an RF Power Amplifier board. Certain models are equipped with optional functions on piggyback PCBs atop the exciter motherboard.