[Elecraft] Optimising the PA stages

[John A. Ross [Ecraft]]

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ron 
> D'Eau Claire
> Sent: Sunday, July 09, 2006 1:52 AM
> To: elecraft at mailman.qth.net
> Subject: RE: [Elecraft] Optimising the PA stages
> 
> There is an optimizing mod to one toroid for the K2 IF you 
> are going to work at 5 watts or less, maximum. It'll reduce 
> the xmit current a bit to help those using he QRP K2 with 
> internal batteries. The flip side is that the rig is less 
> efficient at higher levels. 
> 
> It's on the Elecraft web site (www.elecraft.com) under 
> Builder's Resources.

Ron

Thanks, I already found that one. 

It actually mentions it in the schematic in the manual but applies only to
T4 turns ratio I think.

At the moment its working quite well, its in my nature to be curious though
;-)

I am going to have plenty fun with it either way.

All best

John 


 
> 
> Ron AC7AC
> 
> -----Original Message-----
> Hi All
> 
> Ser Nr 5544 is now alive and kicking.
> 
> When doing the Align/Test P III with the referenced power 
> level setting of 10.0W I find the current level hovering 
> around the upper limit of the recommended range at 2.0 amps 
> although I did not see any Hi Current warnings.
> 
> All the RX/TX alignment also seems OK. Is there any published 
> tables on typical performance variance across the bands 
> regarding signal level in for say S9 or MDS? or typical power 
> levels out?
> 
> This leads me to believe that some optimising can possibly be 
> done, or I have some stages slightly off the intended specs.
> 
> I was sure I seen some posts previously on alternate winding 
> of the transformers in the TX chain from T1 onwards but I am 
> getting way to may hits from the 11k messages I have archived 
> from this list to be able to filter them down easily.
> 
> Any information appreciated.
> 
> John
>  
> 
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