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RF Technology T220 Operation And Maintenance Manual

Eclipse series
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Eclipse Series
RF Technology
rfinfo@rftechnology.com.au
November 2001
T220 Transmitter
Operation and Maintenance Manual
This manual is produced by RF Technology Pty Ltd., 10/8 Leighton Place, Hornsby, 2077, Australia
Copyright © 2001, RF Technology
Part No. 03/9103/0002

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  • Page 1 Eclipse Series RF Technology rfinfo@rftechnology.com.au November 2001 T220 Transmitter Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd., 10/8 Leighton Place, Hornsby, 2077, Australia Copyright © 2001, RF Technology Part No. 03/9103/0002...

  • Page 2: Table Of Contents

    CTCSS and Tone Filter Audio Signal Processing PTT and DC Remote Control 5.10 Microprocessor Controller 5.11 Voltage Regulator Field Alignment Proceudre Standard Test Conditions VCO Alignment TCXO Calibration Modulation Balance Tone Deviation Deviation Line Input Level Output Power Page 2 RF Technology T220...
  • Page 3 T/R Relay Driver 7.4.20 Channel Select Input / Output 7.4.21 DC Remote Keying 7.4.22 Programmable No-Tone Period 7.4.23 Firmware Timers 7.4.24 CTCSS Connectors 7.5.1 Antenna Connector Tone Squelch Frequencies 7.5.2 Power and I/O Connector 7.5.3 Test Connector RF Technology T220 Page 3...
  • Page 4 CONTENTS CONTENTS Engineering Diagrams Block Diagram Circuit Diagrams Component Overlay Diagrams Parts List Page 4 RF Technology T220...

  • Page 5: Operating Instructions

    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...

  • Page 6: Pwr Led

    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 issue 4 and lower use the LED flash rate to indicate the alarm condition. Refer to table 2. Page 6 RF Technology T220...

  • Page 7: Transmitter Internal Jumper Options

    Either the 600 Ω or the high-Z balanced inputs may be selected. Condition Position 600 Ω Input 2-3 * High-impedance Input JP6: Input Level Attenuation This jumper permits coarse input sensitivity to be set. Condition Position 0dB attenuation 1-2 * 20dB attenuation RF Technology T220 Page 7...

  • Page 8: Jp7: Audio Response

    TecHelp allows setting of the adaptive noise squelch threshold, provides a simple means of calibrating the forward and reverse power detectors, setting the power alarm preset levels, and enabling transmitter hang time and timeout time limits. Page 8 RF Technology T220...

  • Page 9: Circuit Description

    4 CHANNEL AND TONE FREQUENCY PROGRAMMING TecHelp can be supplied by your dealer, distributor or by contacting RF Technology directly. Function Signal Pins Specification dc power +12 Vdc 1, 14 +11.4 to 16 Vdc -12 Vdc 13, 25 Channel Select...

  • Page 10: Pll Section

    U1a and U1b. The forward and reverse voltages from U1a and U1b are compared to the DC reference voltage from RV1. The difference is amplified by U1c, Q3 and Q4. Page 10 RF Technology T220...

  • Page 11: 600 Ω Line Input

    The selected source is coupled to U9c which is a balanced input unity gain amplifier. The buffered tone from U9c is fed to 300 Hz low pass filter U7c. RV3, the tone deviation trimmer, is used to adjust the level of the tone RF Technology T220 Page 11...

  • Page 12: Audio Signal Processing

    Opto-isolator ISO1 is used to isolate the loop current signal from the transmitter PTT logic. The loop current passes through the input of ISO1 and the output of ISO1 connects to the PTT logic. Page 12 RF Technology T220...

  • Page 13: Microprocessor Controller

    U14 which is run from the regulated 9.4 Volt supply. Field Alignment Procedure The procedures given below may be used to align the transmitter in the field. Normally, alignment is only required when changing operating frequencies, or after component replacement. RF Technology T220 Page 13...

  • Page 14: Standard Test Conditions

    TCXO Calibration 1. Select a channel at the centre frequency (half way between the highest and lowest frequencies for the model in question). 2. Disconnect the Audio input (no signal input). 3. Key the PTT line. Page 14 RF Technology T220...

  • Page 15: Modulation Balance

    3. Adjust RV3 for the desired deviation in the range 0-1kHz. If subtone (CTCSS) coding is not to be used, adjust RV3 fully CCW. ____________________ The factory default is 500Hz for wide band (5kHz maximum deviation) and 250Hz for narrow band channels. RF Technology T220 Page 15...

  • Page 16: Deviation

    1.0dB cable and connector losses, and assume that the maximum rated power is 30W. This means no more than 24W at the end of a 1m length of test cable. This pessimistic procedure is safe on all models manufactured at the time of writing. Page 16 RF Technology T220...

  • Page 17: Specifications

    7.1.3 Channel Programming The channel information is stored in non-volatile memory and can be programmed via the front panel test connector using a PC and RF Technology software. 7.1.4 Channel Selection Channel selection is by eight channel select lines. These are available through the rear panel connector.

  • Page 18: Microprossor

    Line Input - 6 + Ground (pin 1) Forward Power - 8 + Ground (pin 1) Reverse Power - 4 + Ground (pin 1) Tuning Voltage - 9 + Ground (pin 1) Serial Data (RS-232) - 2/3 + Ground (pin 1) Page 18 RF Technology T220...

  • Page 19: Electrical Specifications

    ± 2.5 ppm over 0 to +60 C, standard ± 1ppm over -20 to +60 C, optional 7.4.5 Number of Channels 100, numbered 00 - 99 7.4.6 Antenna Impedance 50 Ω 7.4.7 Output power Preset for 2-25 Watts RF Technology T220 Page 19...

  • Page 20: Transmit Duty Cycle

    50dB referenced to rated system deviation. 7.4.14 600 Ω Ω Ω Ω Line Input Sensitivity Adjustable from -30 to +10 dBm for rated deviation 7.4.15HI-Z Input Impedance - 10K Ω Nominal, balanced input Input Level - 25mV to 1V RMS Page 20 RF Technology T220...

  • Page 21: Test Microphone Input

    7.4.21 DC Remote Keying An opto-coupler input is provided to enable dc loop keying over balanced lines or local connections. The circuit can be connected to operate through the 600$\Omega$ line or through a separate isolated pair. RF Technology T220 Page 21...

  • Page 22: Programmable No-Tone Period

    Tone frequencies are given in table 4. 7.5 Connectors 7.5.1 Antenna Connector Type N Female Mounted on the module rear panel ____________________________ The reverse phase burst is usually sufficient to eliminate squelch tail noise in higher-quality mobiles. Page 22 RF Technology T220...

  • Page 23: Tone Squelch Frequencies

    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 Table 4: Tone Squelch Frequencies 233.6 241.8 250.3 254.1 RF Technology T220 Page 23...

  • Page 24: Power And I/O Connector

    (exciter) PCB. Figure 3 shows the detailed circuit diagram with component numbers and values for the higher-power PA variation. Figure 4 shows the detailed circuit diagram with component numbers and values for the lower-power PA variation. Page 24 RF Technology T220...

  • Page 25: A.3 Component Overlay Diagrams

    (exciter) PCB. Figure 6 shows the detailed circuit diagram with component numbers and values for the higher-power PA variation. Figure 7 shows the detailed circuit diagram with component numbers and values for the lower power PA variation. RF Technology T220 Page 25...
  • Page 26 APPENDIX B – T220 Parts List APPENDIX B – T220 Parts List Main PCB Assembly Parts Ref. Description Part Number CAP 10U 35V RAD ELECTRO 41/2001/010U CAP 1N0 5% 63V NPO SM1206 46/3300/01N0 C100 CAP 1N0 5% 63V NPO SM1206...
  • Page 27 APPENDIX B – T220 Parts List Ref. Description Part Number CAP 1N0 5% 100V NPO RAD.2 46/2000/01N0 CAP 10N 10% 50V X7R RAD.2 46/2001/010N CAP 1N0 5% 100V NPO RAD.2 46/2000/01N0 CAP 100N 10% 50V X7R RD.2 46/2001/100N CAP 100N 10% 50V X7R RD.2 46/2001/100N CAP 1N0 5% 100V NPO RAD.2...
  • Page 28 APPENDIX B – T220 Parts List Ref. Description Part Number CAP 1N0 5% 63V NPO SM1206 46/3300/01N0 CAP 100N 10% 63V X7R 1206 46/3310/100N CAP 1P8 5% 63V NPO SM1206 46/3300/01P8 CAP 100N 10% 63V X7R 1206 46/3310/100N CAP 1N0 5% 63V NPO SM1206...
  • Page 29 APPENDIX B – T220 Parts List Ref. Description Part Number FERRITE BEAD SMD 37/3321/LM31 FERRITE BEAD SMD 37/3321/LM31 AMP MMIC MWA0211L SOT143 24/3010/211L AMP MMIC MWA0211L SOT143 24/3010/211L AMP MMIC MWA0211L SOT143 24/3010/211L AMP MMIC MWA0211L SOT143 24/3010/211L AMP MMIC MWA0211L SOT143...
  • Page 30 APPENDIX B – T220 Parts List Ref. Description Part Number R124 RES 150K 5% 0.25W AXIAL 51/1040/150K R125 RES 680K 5% 0.25W AXIAL 51/1040/680K R126 RES 680K 5% 0.25W AXIAL 51/1040/680K R127 RES 470K 5% 0.25W AXIAL 51/1040/470K R128 RES 680K 5% 0.25W AXIAL...
  • Page 31 APPENDIX B – T220 Parts List Ref. Description Part Number RES 10K 5% 0.25W SM1206 51/3380/010K RES 10K 5% 0.25W SM1206 51/3380/010K RES 7K50 1% 0.25W AXIAL 51/1010/07K5 RES 10K0 1% 0.25W AXIAL 51/1010/010K RES 91K 5% 0.25W AXIAL 51/1040/091K RES 100K 5% 0.25W AXIAL...
  • Page 32 APPENDIX B - T220 Parts List Ref. Description Part Number SWITCH BCD PRE-SET 31/4001/0BCD SWITCH BCD PRE-SET 31/4001/0BCD TRANSFORMER LINE 600 OHM 37/2040/5065 IC RS232 INTER MAX232C 26/2001/232C IC ANALOGE GATE MC14066B 26/2040/4066 IC QUAD NAND 74C00 DIP14 26/2031/4C00 IC MICRO 68HC11A1P...
  • Page 33 RES 15K 5% 0.25W AXIAL 51/1040/015K RES 7K5 1% 0.25W AXIAL 51/1010/07K5 RES 100K 5% 0.25W AXIAL 51/1040/100K RES 100 5% 0.25W SM1206 51/3380/0100 RES 47R 5% 0.25W SM1206 51/3380/0047 47nH Coilcraft midispring 37/AC52/047N AMP 20W 220-245MHz 18/M687/0029 RF Technology T220 Page 33...

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