Re: KPA500 active devices!!

Posted by Joe Subich, W4TV-4 on Apr 17, 2010; 11:45pm
URL: http://elecraft.85.s1.nabble.com/News-from-Visalia-tp4914396p4919192.html


The VRF2933 is rated for 300 Watts each according to the data
sheet on the manufacturer's web site (Microsemi) ... That makes
their use in a 500 W amplifier reasonable from an IMD perspective.

The VRF 2933 minimum gain is also 20dB (23 dB typical) so it
would appear that the KPA-500 should be capable of clean
operation with 5 W of drive (e.g., K3 in low power mode).
 
73,

   ... Joe, W4TV
 
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Doug
> Faunt N6TQS [phone]
> Sent: Saturday, April 17, 2010 6:45 PM
> To: [hidden email]
> Subject: [Elecraft] KPA500 active devices!!
>
>
> There are two VRF2933's in push-pull, so they're not 750
> watts each, but per pair.  There are only three amps in
> existance, and no devices have been destroyed (yet).  Again,
> 500 watts is a very conservative rating. It's been key-down
> for 10 minutes withy no problems.
>
> 73, doug

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