[RFI] Report on 12V 750W server supplies

[Hare, Ed W1RFI]

Allthough cranking the voltage past 13.8 volts probably won't damage anything, there is no guarantee to that, so just keep that n mind.

Aslo, for something like  server supply, this could well be a Class A digital device, with significantly higher noise.

________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of Brian Moran via RFI <rfi at contesting.com>
Sent: Friday, June 5, 2020 11:58 AM
To: rfi at contesting.com <rfi at contesting.com>; Jim Brown <jim at audiosystemsgroup.com>
Subject: Re: [RFI] Report on 12V 750W server supplies

I recently purchased the DPS-750RB A model, which is also shown as a HSTNS-PD18. Using the instructions on YouTube, I easily changed the voltage to 13.9v. I haven't had time to look for RFI using an SDR, and certainly won't have as extensive a test setup as Gary does.

I did not try to adjust higher than 14v, though that might be a good experiment. If I had any confidence I wouldn't damage something by doing so, I'd be willing to try higher voltages :-)

-Brian N9ADG


    On Thursday, June 4, 2020, 10:41:17 PM PDT, Jim Brown <jim at audiosystemsgroup.com> wrote:

 On 6/4/2020 2:49 PM, Gary Johnson wrote:
> Output is fixed right at 12V but there are notes on the web about how to change an internal feedback resistor to tweak that up a bit.

Thanks Gary. Do you know how high V+ can be set? Some radios, notably
Elecraft rigs, have lower IMD at higher supply voltages, with 15V max.

73, Jim K9YC
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