My point exactly.
73
Bob, K4TAX
> It's my opinion that originally when switcher power supplies came out,
> they were noisy. This gave them a bad reputation which they no longer
> deserve. The current switcher supplies are now mostly very good and
> produce almost no RF noise.
>
> Carl Moreschi N4PY
> 121 Little Bell Dr.
> Hays, NC 28635
> www.n4py.com
>
> On 9/8/2012 10:56 AM, Bob McGraw - K4TAX wrote:
>> 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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>>>
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>>>
>>
>>
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