Re: Silent power supply for a K3s

Posted by Rick WA6NHC-2 on Jun 09, 2019; 11:41pm
URL: http://elecraft.85.s1.nabble.com/Silent-power-supply-for-a-K3s-tp7652889p7652902.html

The issue with oversizing it is (for the energy conscious) a linear
supply demands more, ALL the time (it's inefficient with energy).

In some places it matters because of the KwH costs.  pennies turn into
dollars.

(Not here, I was used to the higher prices and after I moved here, I
just stopped caring because the costs were 1/3 or less. I've even been
known to <gasp> run the air conditioner here!)

Rick nhc

On 6/9/2019 12:26 PM, Bob McGraw K4TAX wrote:

> I find Mark's point very important.   Obtain and use a supply which is
> more than adequate for the service or load.  Thus a 25 amp supply
> feeding a radio drawing 20+ amps will need lots of cooling.   This is
> not the way to do it.   Get a 50 amp supply for a radio drawing 20+
> amps and the fan(s) will likely never come on.     Go the cheap way
> and get the cheap results.    Do it right and be happy.   Don't be a
> cheap ham and then complain about the product you purchased.
>
> There is more to choosing a power supply than volts and amps. How
> about duty cycle?  And CCS rated supplies vs. ICAS rated supplies.  
> Humm.......
>
> 73
>
> Bob, K4TAX
>
>
> On 6/9/2019 2:12 PM, Mark Murray via Elecraft wrote:
>> Peter,
>>
>> Check out the high amperage 13,8 volt power supplies offered by Samlex
>> America at the following link, and in particular their 100-amp -plus
>> (continuous) supplies where the fans do not activate for low draws. 
>> You had
>> mentioned something about price not being so important.  These ain't
>> cheap.
>> 73 de Mark .w2or.
>>
>
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