Re: KPA-1500 Efficiency As A Function of Input Power

Posted by ke9uw on Aug 18, 2018; 12:40am
URL: http://elecraft.85.s1.nabble.com/KPA-1500-Efficiency-As-A-Function-of-Input-Power-tp7644440p7644475.html

Seems like this discussion would be functional if it were ways to quiet the fans without compromising the efficiency of the cooling.

Chuck Jack
KE9UW

Sent from my iPhone, cjack

> On Aug 17, 2018, at 7:13 PM, Fred Jensen <[hidden email]> wrote:
>
> Yes.  Electricity cost to generate the RF that earns the revenue is a major part of the broadcast station budget.  Not so much for amateurs.  Since FM is constant envelope modulation, it makes sense it would have a lower overall efficiency.  Even Rush Limbaugh has to take a breath occasionally on AM ... it makes no difference on FM. [:-))
>
> 73,
>
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
>> On 8/17/2018 3:45 PM, W2xj wrote:
>> Today in broadcast we generally rate transmitters by AC in to RF out. For AM transmitters that figure is in the low 90 percent range and the current FMs run at about 74% AC in to RF out.
>>
>>
>
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