Table of Contents
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List of Figures
Figure 1 MST3 Block diagram ..................................................................................................................................... 7
Figure 2 Carrier oscillator .......................................................................................................................................... 14
Figure 3 Balanced Modulator ................................................................................................................................... 15
Figure 4 Crystal Filter .................................................................................................................................................. 16
Figure 5 Transmit mixer ............................................................................................................................................. 17
Figure 6 Power amplifier and RX/TX switching ............................................................................................... 18
Figure 7 Receive mixer ................................................................................................................................................ 19
Figure 8 Receive audio ................................................................................................................................................ 20
Figure 9 Component overlay .................................................................................................................................... 37
Figure 10 BPF schematic ............................................................................................................................................ 38
Figure 11 Completed BPF........................................................................................................................................... 38
Figure 12 BPF overlay ................................................................................................................................................. 40
Figure 13 LPF schematic ............................................................................................................................................ 42
Figure 14 LPF overlay .................................................................................................................................................. 43
Figure 15 Completed LPF ........................................................................................................................................... 43
Figure 16 MST3 in an enclosure .............................................................................................................................. 46
Figure 17 MST3 board and rear panel .................................................................................................................. 47
Figure 18 Wiring diagram .......................................................................................................................................... 49
Figure 20 Carrier frequency and crystal filter relationship ......................................................................... 56
List of Tables
Table 1 BPF components ............................................................................................................................................ 41
Table 2 LPF components ............................................................................................................................................ 44
Table 3 VFO selection .................................................................................................................................................. 45
Table 4 Typical circuit voltages. .............................................................................................................................. 53
MST3 Construction and Operation Manual - Issue 1
Page 4
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