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1 I
NTRODUCTION
The MST (Minimalist Sideband Transceiver) is an easy to build and fun to use single sideband
QRP transceiver for the 40M or 80M amateur bands.
The MST transceiver follows a minimalist design making it inexpensive and simple to build yet
still delivering excellent performance and a pleasure to operate.
The MST PCB contains a complete SSB transceiver except for a VFO. You can add a VFO of your
own, as long as it has the correct frequency range and drive level, but to obtain best results it
should be used with the companion DDS VFO. The DDS VFO offers drift free performance and
features a clear backlit LCD display, selectable frequency steps and programmable IF offset.
MST Features:
1. Complete SSB transceiver on a single PCB (just add a VFO).
2. Superhet receiver using a 4 pole 10MHz crystal filter.
3. 5W PEP minimum power output using a rugged power MOSFET output stage.
4. Unwanted sideband suppression is typically 40dB.
5. All spurious transmit outputs below -45dBc.
6. AF and microphone gain controls.
7. Easy to adjust and set up.
8. Front panel LED transmit power and modulation indicator.
9. Plenty of audio output to drive a loudspeaker.
10. High quality double sided PCB with groundplane, solder mask and silk screen.
11. Simple and easy to build using all through hole components.
12. No complicated coil winding required. Uses inexpensive commercial coil assemblies for
tuned circuits.
A range of kits containing PCBs and hard to get parts for the MST and the DDS VFO are available
from www.ozQRP.com.
MST Construction Manual – Issue 1
Page 4
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