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Related Manuals for RF Technology R350
Summary of Contents for RF Technology R350
- Page 1 Eclipse Series RF Technology rfinfo@rftechnology.com.au February 2005 R350/R500 Receiver Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd 10/8 Leighton Place, Hornsby, 2077 NSW Australia Copyright ©1998, RF Technology...
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Page 2: Table Of Contents
PLL Section Audio Signal Processing Noise Filter, Amplifier and Detector Subtone Filter and CTCSS Microprocessor Controller Carrier Operated Switch 5.10 Voltage Regulator Alignment Procedure Standard Input Signal RF Alignment IF Alignment Line Level Adjustment TCXO Calibration Page 2 RF Technology R350/R500... - Page 3 7.4.22 External Squelch Input Connectors 7.5.1 Antenna Connector 7.5.2 Power and I/O Connector 7.5.3 Test Connector Engineering Diagrams A.1 Block Diagram A.2 Component Overlay Diagram A.3 Jumper Link Positions A.4 Jumper Link Description Parts List RF Technology R350/R500 Page 3...
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Page 4: Operating Instructions
Turn the adjustme nt counter clockwise until the squelch opens as indicated by the SQ LED. In the absence of any on channel signal, turn the screw clockwise until the SQ LED goes off. Then turn the screw one additional turn in the clockwise direction. Page 4 RF Technology R350/R500... -
Page 5: C.sq
The alarm indicator shows the highest priority fault present. Receivers using software issue 5 and higher use the cadence of the LED flash sequence to indicate the alarm condition. Refer to table 1. Receivers using software RF Technology R350/R500 Page 5... -
Page 6: Receiver Internal Jumper Options
JP1 allows the 240Hz notch filter in the normal audio path to be bypassed. Condition Position Notch Filter In 1-2 * Notch Filter Out JP2: Audio Response Condition Position 750 uSec. de-emphasis 1-2 * Flat response Page 6 RF Technology R350/R500... -
Page 7: Jp3: Audio Filter In/Out
JP7, JP8, JP9: Direct Output COS In this arrangement, the COS signal is taken via the separate COS+ and COS- outputs, either with free (floating) output or with +12Vdc pull- up. Condition +12 Vdc Direct Output Free Switch Output RF Technology R350/R500 Page 7... -
Page 8: Jp11 Eprom Type
TecHelp/ Service Monitor allows setting of the adaptive noise squelch threshold, provides a simple means of calibrating the signal strength output and minimum signal alarm. TecHelp/ Service Monitor can be supplied by your dealer, distributor or by contacting RF Technology direct. Page 8 RF Technology R350/R500... - Page 9 Opto-coupled Transistor Carrier Operated Sw COS- Switch (10mA 30V max) External Squelch Input <1 Vdc to Squelch >2 Vdc or open circuit to unsquelch Table 3: Pin connections and explanations for the main, 25-pin, D-shell Connector RF Technology R350/R500 Page 9...
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Page 10: Circuit Description
The 455 kHz output of the second mixer is fed through a ceramic filter CF1 to the limiter and discriminator IC U3. CF1 provides additional adjacent channel selectivity for 25 kHz versions and all of the adjacent channel selectivity for 12.5 kHz versions. Page 10 RF Technology R350/R500... -
Page 11: Vco Section
The phase detector output signals of U4 are used to control two switched current sources. The output of the positive and negative sources' Q10 and Q16, produce the tuning voltage which is smoothed by the loop filter components to bias the VCO varactor diode D4. RF Technology R350/R500 Page 11... -
Page 12: Audio Signal Processing
U15 it can decode all 38 EIA tones and 12 additional commonly used tones. The decode bandwidth is set to 1% but may be changed to 2% by a jumper on the printed circuit board. Page 12 RF Technology R350/R500... -
Page 13: Microprocessor Controller
The following procedures may be used to align the receiver for optimum performance. Normally only RF alignment will be required when changing frequencies. alignment should only be necessary after repairs on that part of the circuit. RF Technology R350/R500 Page 13... -
Page 14: Standard Input Signal
6 and 1. Adjust L10 for maximum reading. Maintain generator level at 1000µV (1mV), modulation on. Measure the audio level between pins 16 and 5 of P1. Adjust RV1 for 0.5Vrms. Page 14 RF Technology R350/R500... -
Page 15: Line Level Adjustment
7.1.2 CTCSS The CTCSS tone or no tone can also be programmed for each channel. So that each channel number can represent unique RF and tone frequency combination. RF Technology R350/R500 Page 15... -
Page 16: Channel Programming
Mute defeat switch - toggle (Overrides CTCSS, noise and carrier squelch at the monitor output) Monitor Speaker Volume - Knob Line Output Level - screwdriver adjust multi-turn pot Noise Squelch Setting - screwdriver adjust multi-turn pot Carrier Squelch Setting - screwdriver adjust multi-turn pot Page 16 RF Technology R350/R500... -
Page 17: Indicators
Polarity - Negative Ground 7.4.2 Frequency Range and Channel Spacing Frequency 25 kHz 12.5 kHz 350-380 MHz R350A R350AN 370-400 MHz R350B R350BN 400-430 MHz R500A R500AN 450-490 MHz R500B R500BN 485-520 MHz R500C R500CN RF Technology R350/R500 Page 17... -
Page 18: Frequency Synthesizer Step Size
0.25µV (-119dBm) for 12dB SINAD 0.28µV (-118dBm) for 20dB Quieting 7.4.8 Selectivity 25 kHz spacing - 80dB per RS204C 12 kHz spacing - 70dB per ECR-235 7.4.9 Spurious and Image Rejection 90dB 7.4.10 Intermodulation 80dB per RS204C Page 18 RF Technology R350/R500... -
Page 19: Modulation Acceptance Bw
26dB SINAD as may be required in link applications. The minimum adjustment range is 1 to 200µV. 7.4.14 Receiver Frequency Spread for -1dB degradation R350: ≈7 MHz (approximately 2%) R500: ≈10 MHz (approximately 2%) 7.4.15 Receiver Conducted Spurious Emissions Less than -57dBm from 1 to 2900 MHz 7.4.16... -
Page 20: Audio Distortion
Ic = 10mA Maximum Vc = 30 Volts Maximum 7.4.21 CTCSS The CTCSS decoding is provided by a hybrid module. This provides programmable decoding of all 38 EIA and 12 other common tones. Refer to table 4. Page 20 RF Technology R350/R500... - Page 21 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1 Table 4: Tone Squelch Frequencies RF Technology R350/R500 Page 21...
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Page 22: External Squelch Input
Figure 1 shows the block signal flow diagram. Circuit Diagram Figure 2 shows the detailed circuit diagram with component numbers and values. Component Overlay Diagram Figure 3 shows the PCB overlay guide with component positions. Page 22 RF Technology R350/R500... - Page 23 LOCK DETECT DATA...