The only thing I can think of which might cause a standard supply to be a 
bit noisy is mechanical vibration from the transformer.  That can be easily 
remedied though.

The small size of the switchers appeals to me, but I use analog now because 
of the extra noise that some of the switchers produce.

Steve
----- Original Message ----- 
From: "Butch Bussen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 02, 2014 3:59 PM
Subject: Re: Power Supplies (Switching or Not)


> I'm curious why your standard supply would be "loud"  My astrons don't
> make any noise at all.  If you put your ear on them, you can hear the
> humm, but very quiet.  The 70 amp ones do have fans, but those don't run
> unless needed.
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
>
>
> On Wed, 2 Apr 2014, Gary Lee wrote:
>
>> ok.  the major advantages of the switching supply are size, weight, and
>> eficiency.  They are smaller, lighter, and more power efficient.  Also,
>> usually sound quieter.
>>
>> Disadvantage is that many if not most create rf noise.  The better ones 
>> are
>> pretty darn quiet.
>> I have the alinco dm330v and it is pretty quiet in the ham bands.
>> However, it does make a good deal of noise on am broadcast.  This can be
>> moved around so as not to interfere with the station to which you are
>> listening via an adjustment on the supply.
>>
>> This has been a very good supply for me.  32 amps surge, and smaller than 
>> a
>> shoe box.  weighs maybe 5 pounds.
>>
>> However, I also have an mfj 35 amp surge supply. This is a conventional
>> supply, weighs about 20 pounds, and is roughly comparable to the astron 
>> of
>> the same rating.  No rf noise, but is considerably louder.
>>
>> There are other switchers, the  most highly rated I have heard of are the
>> alinco, astron, and gamma research.
>> The gamma research is interesting because it is well regarded, and 
>> extremely
>> small; more like a laptop charger in size.
>>
>> Hope this helps.
>>
>> ----- Original Message -----
>> From: "Dave Basden" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Wednesday, April 02, 2014 12:48 PM
>> Subject: Power Supplies (Switching or Not)
>>
>>
>>> I may be in the market for a new power supply for my Kenwood
>>> TS-590.  I hate to pay the price of a Kenwood PS-590, so am looking
>>> elsewhere.  It should probably be about 25 amps 13VDC.  Switching
>>> power supplies seem to be about half the price of the old
>>> standard.  They're also a lot lighter in weight.  There must be some
>>> advantage to the old standard supplies or they wouldn't still be
>>> available.  What is the difference and why should I consider the more
>>> expensive standard supply?
>>>
>>> 73,
>>>
>>> Dave, W7OQ
>>
>>