I'm most often and usually always perplexed at the comments regarding the
use of switching power supplies. I have 4 that are used at my stations and
my bench on a regular basis. One being a 3200 VDC @ 1 amp switching supply
that is used for the VHF and UHF amp.
With my installation and grounding technique employed, operating the Omni
VII or the Eagle from a battery, and turning any of these supplies on and
off, I can not observe any noise increase on any of the HF bands. These are
Astron and Lambda 202a supplies.
I contend that my approach to grounding or bonding is the reason for my
success with these switching supplies. And I must say that my approach is
not near as extensive or complex as most hams seem to employ. The antennas
are wire center fed with balanced feed line or coax for HF and yagi designs
with hard-line feeds for the VHF and UHF antennas.
All switchers are not created equal, some are really nasty but do understand
that does not apply to all of them. Yes, see the ARRL test results and
evaluations. This however is not the total picture. I know some or many
folks do not agree with my approach and suggestions on the topic of
grounding , bonding and such. The only concrete position I take is "mine
works!"
73
Bob, K4TAX
----- Original Message -----
From: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Saturday, September 08, 2012 1:39 AM
Subject: Re: [TenTec] TenTec Digest, Power Supplies
Jim, that's why the league tests switcher power supplies for trash.
All you have to do is read the reviews and buy a good one.
You always get trash when you buy cheap, no matter what it is!
73,
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of N4be_Jim
Sent: Saturday, September 08, 2012 4:03 AM
To: tentec@contesting.com
Subject: Re: [TenTec] TenTec Digest, Power Supplies
I use only linear supplies where possible. I couldnt care less about
efficiency. Why? Ever listen to the trash a cheap switcher puts out on
HF?
Unless well designed and filtered, a switching supply will raise the noise
floor several S units. Yes there are decent ones but i would rather not
worry about it. Yes TT makes decent switchers, such as for the Orion, but
ever hear one of those when the fan kicks in? In my area a great deal of
HF
hash in generated by all the cheap Chinese supplies that dont adhere to
our
EMI standards, but we still accept their imports. No I will take my Astron
50 amp 12 vdc supply any day. It runs my O2 and Harris RF-3200E quite
easily while loafing along. Jim N4BE
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