[QRP-L] What's Happening at the Elecraft Dayton Booth? New Products, Building Demo, T-Shirts, Amp and More.

[Ron D'Eau Claire-2]

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 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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[John A. Ross [Ecraft]]

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ron
> D'Eau Claire
> Sent: Sunday, July 09, 2006 1:52 AM
> To: [hidden email]
> 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
>  
>
> _______________________________________________
> 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
>

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