[Elecraft] KPA500 active devices!!

[Joe Subich, W4TV]

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: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Doug 
> Faunt N6TQS +1-510-655-8604
> Sent: Saturday, April 17, 2010 6:45 PM
> To: elecraft at mailman.qth.net
> 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