[TenTec] TenTec Digest, Power Supplies

[Bob McGraw - K4TAX]

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 at DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec at 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 at contesting.com] On Behalf Of N4be_Jim
> Sent: Saturday, September 08, 2012 4:03 AM
> To: tentec at 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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