I never had an issue with my Samlex, even the older one, and of course my
linear Astron works fine, but is bit on the heavy side
If you want to get a really quiet supply, look for one that is rated for
Hospital Medical Equipment – there is a EMC requirement that is very strict
From: Barry W2UP <w2up.co@gmail.com>
Sent: Tuesday, November 12, 2024 8:28 AM
To: Charles Gallo <charlie@thegallos.com>
Cc: cq-contest@contesting.com
Subject: Re: [CQ-Contest] Switching Power Supplies
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ordered the Samlex 1235P-M, which is a newer version of the 1235-M, which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@thegallos.com
<mailto:charlie@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@alum.mit.edu
> <mailto:bdj@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@alum.mit.edu <mailto:bdj@alum.mit.edu>
> @bdj_phd
>
>> On Mon, Nov 11, 2024 at 10:17 AM Charles Gallo <charlie@thegallos.com
>> <mailto:charlie@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@gmail.com
>>>> <mailto:ed.n3cw@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@gmail.com <mailto:w2up.co@gmail.com> >
>>>> To: CQ-Contest Reflector <cq-contest@contesting.com
>>>> <mailto:cq-contest@contesting.com> >
>>>> Subject: [CQ-Contest] 12V 30A Switching Power supply recommendation?
>>>> Message-ID:
>>>> <CACUWneMbC3gksLzOC4Yn3XoEsbKagd-D07Cy94G7B43oaninTw@mail.gmail.com
>>>> <CACUWneMbC3gksLzOC4Yn3XoEsbKagd-D07Cy94G7B43oaninTw@mail.gmail.com">mailto:CACUWneMbC3gksLzOC4Yn3XoEsbKagd-D07Cy94G7B43oaninTw@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 <http://www.avast.com>
>>>
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>>
>>
>>
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