Ferrites are your friend in cases like this.
And for a fellow who has a shack/antenna 25' away, ferrites are
something probably found in abundance already in his shack. At that
distance so many metalic things want to get involved in the noise
generation game or dream of being parasitic elements or diodes and other
than adding distance, ferrites go a very long way in calming down the crowd.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 11/11/2024 7:35 PM, Charles Gallo 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> 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
@bdj_phd
On Mon, Nov 11, 2024 at 10:17 AM Charles Gallo <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> 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>
To: CQ-Contest Reflector <cq-contest@contesting.com>
Subject: [CQ-Contest] 12V 30A Switching Power supply recommendation?
Message-ID:
<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
--
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