[CQ-Contest] Switching Power Supplies

[Steve Dyer W1SRD]

My only gripe with the 1235P-M is the fan noise. Good PS otherwise.
73,
Steve
W1SRD


On 11/12/2024 5:28 AM, Barry W2UP wrote:
> Thanks for all the comments.  To summarize the responses, both to the list
> and private, the two top recommendations were the Samlex and Astron.  FWIW,
> I just ordered the Samlex 1235P-M, which is a newer version of the 1235-M,
> which hopefully incorporates some of the newer designs that Charlie alludes
> to.
>
> Barry W2UP
>
> On Mon, Nov 11, 2024 at 8:22 PM Charles Gallo <charlie at thegallos.com> wrote:
>
>> No,
>> My comment was more along the lines that in the quarter century since that
>> article, I’m sure there are many new models of supply, that it is entirely
>> possible that internally models have changed. It was really really great
>> information on what existed 25 years ago, but how good is it on what exists
>> today?
>>
>> Reading a lot of the EE trade bags, particularly over say the last 4-5
>> years, EMI/RFI has become a big topic for switching power supply folks, and
>> the chip makers that now make chips specifically for power supplies have
>> done work to help eliminate some of the issues, and heck, even the printed
>> circuit board design software folks are putting in features to help
>> eliminate the issues.
>>
>> So yes, great article on what was the state of the ham radio industry at
>> the turn of the century, but how much it reflects today is up for debate
>> --
>> 73 de KG2V
>> Charlie
>>
>>> On Nov 11, 2024, at 8:04 PM, Barry Jacobson <bdj at alum.mit.edu> wrote:
>>>
>>> Hi Charles, wasn't sure if you were addressing my comment. But thanks
>>> for the very informative QST article. Wasn't sure what feature you
>>> were focusing on, but if you look at the spectral plots, all but one
>>> or two have noise issues in the ham bands. That review is from 2000.
>>> Maybe things have improved since then, and you could post a more
>>> recent article. I would be curious. Personally, my hearing is very
>>> poor so I wouldn't want to take a chance unless I knew for sure the
>>> model is noise free. Others may not mind for the convenience of better
>>> portability.
>>>
>>> Best of luck.
>>>
>>> Barry WA2VIU
>>> --
>>> Barry Jacobson
>>> WA2VIU
>>> bdj at alum.mit.edu
>>> @bdj_phd
>>>
>>>> On Mon, Nov 11, 2024 at 10:17 AM Charles Gallo <charlie at thegallos.com>
>> wrote:
>>>> You think that maybe, just maybe, there are new things, and things have
>> changed in nearly a quarter of a century?
>>>> --
>>>> 73 de KG2V
>>>> Charlie
>>>>
>>>>>> On Nov 11, 2024, at 7:57 AM, Ed Goss <ed.n3cw at gmail.com> wrote:
>>>>> Barry:
>>>>>
>>>>> See:
>>>>>
>>>>>
>> http://www.radiomanual.info/schemi/ACC_powersupply/Power_supplies_review_QST_2000.pdf
>>>>> --Ed, N3CW--
>>>>>
>>>>>
>>>>>> Message: 2
>>>>>> Date: Sat, 9 Nov 2024 18:44:49 -0700
>>>>>> From: Barry W2UP <w2up.co at gmail.com>
>>>>>> To: CQ-Contest Reflector <cq-contest at contesting.com>
>>>>>> Subject: [CQ-Contest] 12V 30A Switching Power supply recommendation?
>>>>>> Message-ID:
>>>>>>    <CACUWneMbC3gksLzOC4Yn3XoEsbKagd-D07Cy94G7B43oaninTw at mail.gmail.com
>>>>>> Content-Type: text/plain; charset="UTF-8"
>>>>>>
>>>>>> Looking for a recommendation for a 30A 12VDC switcher.  No RFI is very
>>>>>> important as my antenna is only about 15-20 ft away from the station.
>>>>>>
>>>>>> Tnx,
>>>>>> Barry W2UP
>>>>>>
>>>>>>
>>>>>>
>>>>> --
>>>>> This email has been checked for viruses by Avast antivirus software.
>>>>> www.avast.com
>>>>>
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