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Фрагмент инструкции
Take care not to damage the sealing gasket. With the two parts of the radio separated, for servicing, it will be necessary to link the two pcbs using the flexi-pcb ME110016, which is part of the Service Kit. LOCATION OF ADJUSTMENT POINTS TP1 RF PCB L203C208 TCXO Figure 4-14 – Adjustment Points 4.5.3 PLL Alignment Before any alignment is carried out to the transmitter, or receiver, it is necessary to align the Phase Locked Loop (PLL). The PLL consists of the Rx VCO, Tx VCO and TCXO. If the PLL is out of lock, an audible warning will be heard UL will appear on the LCD display. Note: This alert will also be heard when a at all. channel is programmed out of the range of operation of the radio, or it is not programmed Note: If the power save parameter is programmed there will be a periodic change at TP1. Measurement should be based on the steady state voltage, with power save off. In order to carry out repairs, the two halves of the radio may need to be linked using the flexipcb, ME110016. This is part of the Service Kit and the Interface Box and leads will also be required for some of the tests. Connect the radio under test to the Test Equipment. INSTALLATION, COMMISSIONING & ALIGNMENT -Issue 1.0 Page 4-10 03/01 SP200/210 Maxon SP200/210 Radio Rx VCO a. Select Channel 1. b. Check that the VCO tuning voltage at TP1 is >5.7V +/-0.25V (VHF) or >1.0V +/- 0.25V (UHF). c. Select Channel 3 d. Check that the voltage at TP1 is <12.5V. Tx VCO a. Select Channel 1. b. Set the PTT switch to on and check that the voltage at TP1 is 1.0V +/-0.25V (VHF) or 2.0V +/- 0.25V (UHF). c. Select Channel 3. d. Check that the voltage at TP1 is <12.5V. e. Set the PTT switch to off. Note: If TP1 is below 0.6V or above 12.5V, in any of the above tests, L203 may be adjusted. L203 is covered in wax and therefore great care will need to be taken when removing the wax. TCXO a. Select Channel 2. b. Set the PTT switch to on. c. Using the frequency counter, adjust the TCXO control, so that the transmit frequency is within +/-200Hz of the required frequency. d. Set the PTT switch to off. If no further alignment is to be carried out, it may be necessary to check the squelch setting. 4.5.4 Squelch Sensitivity The RF input level to open the squelch is usually set in the range –123.5 to –117dBm (0.15 to 0.3mV). The squelch should open at a SINAD between 7 and 12dB (no CCITT). The squelch should close between 2 and 4dB of the value at which it opens. RV2 sets the squelch level for 12.5kHz channel spacing and RV4 sets the squelch level for 20/25kHz channel spacing. Note: RV2 MUST be set before RV4. 4.5.5 Transmitter Alignment Power Adjustment See Section 4.4. Issue 1.0 INSTALLATION, COMMISSIONING & ALIGNMENT 03/01 Page 4-11 Maxon SP200/210 Radio SP20/210 INSTALLATION, COMMISSIONING & ALIGNMENT - Issue 1.0 Page 4-12 03/01 All further adjustments require the use of the ACC-2003 Alignment Box. Refer to the ACC-2003 User Manual (on floppy disk) for operational information. Power ATE TXD RXD ATE AUDIO PTT Power DC POWER SUPPLY OSCILLOSCOPE RADIOCOMMUNICATIONS TEST SET 7.5VDC @ 2.4A max. SERIAL DATA AUDIO SERIAL DATA ACC-2003 INTERFACE BOX DEMOD AF IN AF OUT AUDIO OUT AUDIO IN Figure 4-15 – ACC-2003 Alignment Box Test Setup Please refer to the ACC-2003 Interface Test Jig User Guide for details on how to use the ACC-2003 Interface Box. The radio should remain programmed as Section 4.5.1 with ASIC values being read as per the instructions. Note: The ASIC programmer DOES NOT read frequency data, so only default frequencies will be displayed even though the actual radio is programmed and operational on different frequencies. Any adjustments to deviation and balance must be carried out in accordance to the R&TTE directive. SP200/210 Maxon SP200/210 Radio Balance Adjustment a. Select Channel 3 (using software). b. Set the audio generator to a 310Hz tone, low output impedance, at a level of 400mV. c. Press Shift + T on the keyboard to transmit. d. Adjust TXTRIM2/TXTRIM3 to give a square wave on the oscilloscope (check that audio enable is ON on the Interface Box. e. Press Shift + R to turn off the transmitter. Audio deviation adjustment a. Select Channel 3 and press Shift + T to turn on the transmitter. b. Set the audio generator to 1kHz and adjust its level for 60% peak system deviation. Ensure that, depending upon the channel spacing of channel 3, the deviation is either: 12.5kHz channel spacing 1.5kHz dev. or 20kHz channel spacing2.4kHz dev. or 25kHz channel spacing3kHz dev. c. Measure the audio distortion. This should be less than 5%. d. Increase the audio level by 20dB (10x voltage). e. Adjust TXTRIM1. to set the deviation to: 12.5kHz channel spacing 2.25kHz dev. or 20kHz channel spacing3.6kHz dev. or 25kHz channel spacing4.5kHz dev. f. Slowly sweep the audio signal generator between 300Hz and 3kHz. Record the peak deviation. The peak deviation should be: 12.5kHz channel spacing <= 2.5kHz dev. or 20kHz channel spacing<= 4kHz dev. or 25kHz channel spacing<= 5kHz ...
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Рации - SP210 (2.86 mb)
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