[hpsdr] SMPS the wrong way to go

[Phil Harman]

Hi Frank,

We found the same issue and that is why we are not using one.

73's Phil...VK6APH


> I found those little buck regulators running at 300 to 500 kHz. generate a
> fair amount of noise. fc
>
> --- On Wed, 8/11/10, Ray Page <page.ray at gmail.com> wrote:
>
>
> From: Ray Page <page.ray at gmail.com>
> Subject: Re: [hpsdr] SMPS the wrong way to go
> To: phil at pharman.org
> Cc: "FRANCIS CARCIA" <carcia at sbcglobal.net>, hpsdr at lists.openhpsdr.org
> Date: Wednesday, August 11, 2010, 1:11 PM
>
>
> If the SMPS were just slapped down on the board, there would be problems.
> But as Kjell pointed out, the SMPS's connection to the rest of the
> circuitry is the key to a quiet solution. Follow Kjells advice and there
> will be no SMPS problems.
>
> -Ray
>
>
>
> On Tue, Aug 10, 2010 at 7:49 PM, Phil Harman <phil at pharman.org> wrote:
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Frank,
>
> Normally I would agree with you. However, having tested the very high
> frequency SMPSU that Kjell designed on one of the prototype Hermes PCBs I
> can confirm that this is the way forward.
>
> This not your usual SMPSU Toto....
>
> 73's Phil...VK6APH
>
>
>
>
>
>
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> An SMPS on the same board with a -140 dBM noise floor RX will degrade
>> the
>> board.
>> Why make more noise, just remote the regulator or do a better heat sink.
>> Any spurs are too much. Frank
>
>
>
>>  
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