Direct Frequency Synthesiser Technical Manual – Issue 3 Document Author Date Version Document Ref
http://g4hup.com
Dave Powis, G4HUP 11 Aug 2011 Issue 3.00 HUP-05-014
Tel +44 (0)1473 737717
[email protected]
DFS Manual
HUP-05-014 Iss 3.00
Contents Unit Specifications...................................................................................................................................3
Scope of Document .........................................................................................................................4 DFS Description..............................................................................................................................4 Input Buffer Circuit – Fig 3..................................................................................................................................5 Diode Multiplier – Fig 4 ......................................................................................................................................5 Logic Stage – Fig 5 ..............................................................................................................................................6 Synchronous Counting ....................................................................................................................................7 Independent Dividers.......................................................................................................................................7 MF Multiplier – Fig 6...........................................................................................................................................7 LF Low Pass Filter – Fig 7...................................................................................................................................8 Low Frequency Mixer and Multiplier – Fig 8......................................................................................................8 High Frequency Mixer – Fig 9 .............................................................................................................................8 Crystal Filter and Output Amplifier – Fig 10 .......................................................................................................9 Voltage Regulators – Fig 11.................................................................................................................................9
Filter and Attenuator Settings .............................................................................................................10 Errata and Addenda .............................................................................................................................10 Component Locations ...........................................................................................................................10 Maintenance...........................................................................................................................................10 Construction Practices........................................................................................................................................10
DFS Frequency Schema........................................................................................................................11 DFS Filters and Attenuators ...............................................................................................................................11
Appendix ................................................................................................................................................14 Change History...................................................................................................................................................14
© G4HUP 2011
2
8/11/2011
DFS Manual
HUP-05-014 Iss 3.00
Unit Specifications Model Ref Serial No Input Frequency Input Level
10
MHz
+10
dBm
Output Frequency Output Level
MHz >0
dBm nominal - frequency dependent
HF Multiplier MF Divider Ratio MF Multiplier LF Divider Ratio LF Multiplier Supply Voltage
10 – 15
V
Supply Current
mA @ 13vdc
Spurii
