[Elecraft] KPA500 active devices!!

[juergen]

Hi Joe

Have you seen  any IMD data on these devices?


John


--- On Sat, 4/17/10, Joe Subich, W4TV <lists at subich.com> wrote:

> From: Joe Subich, W4TV <lists at subich.com>
> Subject: Re: [Elecraft] KPA500 active devices!!
> To: "'Doug Faunt N6TQS +1-510-655-8604'" <faunt at panix.com>, elecraft at mailman.qth.net
> Date: Saturday, April 17, 2010, 4:45 PM
> 
> 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 
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>