Alan HP106 - English; Default Chapter; Table of Contents

HP106 Service Manual
Page 2 of 12
Contents
1 TECHNICAL SPECIFICATIONS......................................................................................................................3
1.1 Test methods.................................................................................................................................................................3
1.2 Specifications table .......................................................................................................................................................3
2 CIRCUIT DESCRIPTION .................................................................................................................................4
2.1 General information.......................................................................................................................................................4
2.2 Microprocessor/control ..................................................................................................................................................4
2.3 VCO / Synthesizer (PLL) ...............................................................................................................................................4
2.3.a Temperature-Compensated Crystal Oscillator (TCXO) ..................................................................................................... 4
2.3.b Voltage-Controlled Oscillators ........................................................................................................................................... 4
2.3.c Synthesizer ........................................................................................................................................................................... 5
2.3.d Loop Filter ........................................................................................................................................................................... 5
2.4 Transmitter ....................................................................................................................................................................5
2.4.a RF Power Amplifier ............................................................................................................................................................. 5
2.4.b Antenna Switching ............................................................................................................................................................... 5
2.4.c Power control....................................................................................................................................................................... 6
2.4.d Transmitter Audio Circuits .................................................................................................................................................. 6
2.4.e Audio Processing ................................................................................................................................................................. 6
2.5 Receiver ........................................................................................................................................................................6
2.5.a Receiver Front End .............................................................................................................................................................. 6
2.5.b Local Oscillator (LO) .......................................................................................................................................................... 6
2.5.c Mixer .................................................................................................................................................................................... 6
2.5.d FM Detector and Squelch .................................................................................................................................................... 6
2.5.e Receiver Audio Circuit......................................................................................................................................................... 7
2.6 Signalling.......................................................................................................................................................................7
2.6.a General................................................................................................................................................................................. 7
2.6.b CTCSS Tone Encoder / Digital Code Squelch (DCS) Encoder .......................................................................................... 7
2.6.c Selective call ........................................................................................................................................................................ 7
2.6.d Scrambler ............................................................................................................................................................................. 7
2.7 Battery ...........................................................................................................................................................................7
3 ADJUSTMENTS ..............................................................................................................................................9
3.1 General..........................................................................................................................................................................9
3.2 Synthesizer/Transmitter VCO Check ............................................................................................................................9
3.2.a Frequency Adjustment ......................................................................................................................................................... 9
3.3 Transmitter Alignment ...................................................................................................................................................9
3.3.a Power Adjustment ................................................................................................................................................................ 9
3.3.b Modulation Adjustment........................................................................................................................................................ 9
3.3.c CTCSS/DCS adjustment..................................................................................................................................................... 10
3.3.d Selcal adjustment ............................................................................................................................................................... 10
3.4 Receiver Alignment .....................................................................................................................................................10
3.5 Figure 1 - Equipment Test set-up................................................................................................................................11
3.6 Figure 2 - Test adaptor................................................................................................................................................12