[hpsdr] Demeter = HPSDR power supply(?)

[Doug Bade]

I would consider that a good time base source will probably have its 
own regulator on board to minimize load changes affecting the time 
base, so a power supply modestly filtered to source it may be a good 
plan to support the higher voltage of the OCXO... let the OCXO board 
deal with precision voltages needed...localized precision regulation 
is a lot easier to keep stable....

Maybe a 28vdc to source any other higher voltage supplies would do, 
and provide enough capacity to handle the other higher voltage tasks...

Doug
KD8B


At 11:12 AM 6/8/2007, Jeroen Bastemeijer wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>Dear Michael,
>
>Thanks for your reply. A switcher might be a solution... allthough, a
>non-switching supply will cause less spurs/birdies....
>
>One thing, if it will be a switched mode power supply, the switching
>frequency should be tunable, this provides the means to get any spurs
>outside the band of reception. Some commercial HAM-power supplies have
>this feature.
>
>The 24 volt for the OCXO is based on the HP oscillators (e.g. the 10811)
>which show up frequently on the surplus-market. But the +15Volts should
>be available as well.
>
>I printed both references to read during the weekend. Have a nice weekend,
>
>73 Jeroen PE1RGE
>
>michael taylor wrote:


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