[hpsdr] Power Supply +/-12 vs. +/-15V

[Ahti Aintila]

John,

I have used successfully ±12 V from an external supply for the
SDR-1000 to get rid of the noise from the internal ±15 V "chopper".

73, Ahti OH2RZ


On 31/05/07, john_eckert at agilent.com <john_eckert at agilent.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> I'm putting my HPSDR cards into a box with the SDR1000 stack.  Linear supply,
> all HPSDR/Flex connections inside the box.
>
> HPSDR has +/-12V power requirements. The Flex uses +/-15V for the INAs.
>
> OPTIONS:
> i.  So far it looks like the HPSDR cards have on board regulators and would
> probably be OK with +/-15V.
>
> ii.  I think the Flex INAs can be run at a reduced +/-12V.
>
> DRAWBACKS:
> i.  +/-15V to HPSDR.  Higher dissipation in on board reg's.  Could be an issue
> with future HPSDR boards.
>
> ii.  +/-12V to Flex. Less RX DNR?  More RX noise?  Anyone know?
>
>
>
> I'm thinking I'll just run +/-12V to the Flex at this point or maybe split the
> difference at +/-13.5V.  I love democracy!
>
>
> Comments please.
>
> 73,
> John
> k2ox
>
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