The regulators for Tiny Demeter (and Demeter) will be build from discrete components. It expects a fairly well regulated 13.6 till 13.8Volts.Ĭurrent rating can be increased by adding multiple regulating power transistors. Tiny Demeter uses the station power supply as main-source. temporary solution unitl Demeter becomes available The switcher will be situated in the low-voltage part. Building a switcher for 110Vac/230Vac is too dangerous and complicated (safety regulations) for (less experienced) home-builders. Will the 13.8Volt really be 13.8Volt or “something” between 11.0 Volt and 15 Volt? In other words: How many people are going to use the HPSDR mobile? Linear (A “lot of heat”, not “green”, easy to construct and trouble-shoot) Switching (Less heat, more “green”, more noise, more difficult to construct) Transformers: From my opinion there will always be a normal mains-transformer, both in the switching and the linear power supply option.

Questions/remarks Switching or Linear? Internal/External? Power dissipation (Convection cooling/ forced air-cooling)? Do we need computer monitoring of voltages and currents? Include an USB-HUB (use one of the ports for the power supply communication)? Configuration (to use or not to use the SDR-1000)? People who use it in combination with the SDR-1000 need less power from the power-supply and are using a custom built supply or the SDR-1000 power supply. HPSDR configuration Ozymandias - interface module Mercury – receiver (5V 500mA, 12V 200mA, -12V not used) Penelope – transmitter (5V 300mA, 12V 200mA, -12V not used)) Alexiares - RF Bandpass Filters Gibraltar - frequency standard Epimetheus - antenna and other switching Measured: Ozy + Janus: +12v 200mA, +5v 180 ma, -12v 70 ma Position of the power supply On the Atlas backplane In a separate box (outside/inside Pandora) Power supply communication Atlas backplane USB-bus 1 wire interface (controlled by a board on Atlas) Dumb-interface using the pins T7 and T8 on the AtlasĬonnection to the HPSDR Using the ATX power connector, communication via the USB bus Using the DIN41612 connector using the Atlas backplane for communication Monitoring Input voltage Output voltage Output currents Temperature Protection Input protection (high/low voltage, polarity) Output protection (current limiting, voltage crowbar) Output connector ATX-connector DIN 41612 (Atlas connectors) Standby supply (for GPS-engine and OCXO) Constant on +5 Volt +15 Volt +24 Volt (depends on OCXO used, if possible user definable/adjustable) Output voltages Remote switchable voltages +5 Volt …. Input connector Powerpole connector for DC 13.8 Volt Mains connector: National standard Temperature sensor(s) 26.Ěnalog to digital converter (for voltage and current) 27.Ěnalog multiplexer 28.Ĝontrolled fan (forced air cooling) USB-Hub – one port used for communication with Demeter 24.

Overvoltage protection for U++ (Could be used for a PA) 23. Switch – Switches between inverter and mains power 19. Inverter – generates negative supply from the positive supply 18. Overvoltage protection +12Volt 13.Ĝharger (optional) 14.

Switch – Switches between battery, mains and external power 10. Power rectifiers and buffercapacitors (positive + negative voltage) 9. Switch – Switches between mains and battery power 4. Standby transformer – Used for the GPS and OCXO 2. Battery (13.8 Volt) input with automatic switchover, Depth of Discharge Quote: '.The recommended end-of-discharge voltage for the SLA is 1.75V/cell.' 1.75*6=10.5V (lowest voltage), Charging the Lead Acid Battery Quote: '.Correctly setting the cell-voltage limit is critical.13.8 Volt DC (always 13.8 V or is there a supply range, see remark below).Result of the discussion on the HPSDR mailing-list (11th June 2007): Tiny Demeter will be more suitable for experimenters and allow us to gain some experience before constructing Demeter.įurther information will be presented on this page when it becomes available. On the 13th of June 2008, Tiny Demeter is added to the Demeter page. Although power supplies are widely available, Demeter will be specifically designed for the HPSDR project. 'Demeter' is the project-name for the HPSDR power supply.

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