Radio Shack 2101628 User Manual 59803
RadioShack Corporation 59803
8
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Adjust the coil L601 for 2V at 1-Ch RX 6. Check that ch-40 voltmeter of receiver reads from 2 to 4 volts 3.2 Transmitter a. TX Power alignments with RF voltmeter at best of Q701, transmit of channel 18. Adjust in turn L701, L702 for maximum reading on RF voltmeter. Repeat as need- ed. Remove RF voltmeter. b. Hex Hod Alignments Adjust RV401 to obtain 90% HOD. At 16 dB greater than 50% MOD. AF 1 KHz. c. Final Check 1. output power should be from 3.6 to 4.0 watts. 2. Frequency should be within +400 H: of channel center frequency. 3. spurious content as observed on spectrum synthesizer should be at least 60 dB below carrier. 4. with 2500 Hz modulation at 16 as greater than that required to produce sot modulation, occupied bandwidth should be at least 2 as better than limit spec. TRANSMITTER TUNE-UP PROCEDURE FCC ID: AA02101628 APPENDIX 6 FCC ID: M02101628 APPENDIX 7 CIRCUITS AND DEVICES TO STABILIZE FREQUENCY A11 40 channels of transmitting, and receiving, frequencies are provided by PLL (Phase Locked Loop) circuitry. The purpose of the PLL is to provide a multiple number of frequencies from vco (Voltage controlled Oscillator) with quartz crystal accuracy and stability from on crystal oscillator refer- ence frequency. The reference crystal oscillator frequency is 10.24 MHz. CIRCUITS AND DEVICES T0 STABILIZE FREQUENCY FCC ID: AAO210162B APPENDIX 7 FCC ID: AAOZlOlGZB APPENDIX 8 CIRCUITS FOR SUPPRESSION SPURIOUS RADIATION The tuning circuit between frequency synthesizer and final amp Q7o4 and 4-staqe "PI" network C718, C719, L711, C721, L712, C725, L725, L713 and C723 in the Q7o4 output circuit serve to suppress spurious radiation. This network serves to impedance match 0704 to the antenna and to reduce spuri- oue content to acceptable levels in the frequency synthesiz— er. CIRCUITS FOR LIMITING MODULATION A portion of the modulating voltage is rectified by D402 which turns on 10401 attenuating the mic input. The result— ing feedback loop keeps the modulation below 100 percent for inputs approximately 40 dB greater than that required to produce 50 percent modulation. CIRCUITS FOR LIMITING POWER During factory align-ant, tuning is adjusted so that the actual power is from 3.6 to 3.9 watts. There are no other controls for adjusting power. DEVICES AND CIRCUITS T0 SUPPRESS SPURIOUS RADIATION AND LIMIT MODULATION FCC ID: AA02101628 APPENDIX 8
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