Safe continuous power level of KPA 100/ transformer design

[Renardy, Martin]

Dear gentlemen,

I have two questions regarding the KPA 100 option:

1) What is the safe continuouse power level, which can the KPA 100
deliver for example for one hour?

2) How does the PA transformer work? Somehow the cores itself seem to be
the primary input of the
    transformer?

Regards

Martin
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-3]

Martin,

The safe operating level will be determined primarily by heat.  For
continuous operation, you may want to consider an auxiliary fan pulling air
up and away from the heat sink fins - a muffin fan will do nicely and can be
salvaged from an old computer.  By my recollection devices rated for
continuous duty can handle only about 1/3 the power that may be used in ICAS
service, and that would make the continuous power rating for the KPA100
somewhere between 35 and 40 watts.

Yes, the metal frame of the transformer constitutes one turn (it is
center-tapped).

73,
Don W3FPR

> -----Original Message-----
>
> I have two questions regarding the KPA 100 option:
>
> 1) What is the safe continuouse power level, which can the KPA 100
> deliver for example for one hour?
>
> 2) How does the PA transformer work? Somehow the cores itself seem to be
> the primary input of the
>     transformer?
>
> Regards
>
> Martin
>

--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.323 / Virus Database: 267.6.5 - Release Date: 6/7/2005

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com