[Elecraft] Re: K3 SSB power setting

[Dr. Werner Furlan]

hi Wayne, 

to make a long story short - all ok now!!
explanation between the lines:

wayne burdick schrieb am 4 May 2008 um 10:04:

> > when I transmit in SSB I am not able to get 100 % HF output.
> > peak power is around 40 Watts whatever I do, reading on the LP-100 peak
> > power meter. (using a Heil Proset with HC 5 Element) RF display is about
> > 40 % max.
> >
> > But! when I key the transceiver with the CW paddle in SSB (new feature,
> > very welcome!)  I suddenly get full output also with normal speech.
> >
> > If I twist the power a little up or down, I am back on 40 % output, with
> > one Dit in CW I can have the full power back.


> Have you tried doing power calibration on all bands as described in the
> manual? You need to do TUNE on each band, into a dummy load, at both 5 W
> and 50 W. This should get you reasonably close at 100 W.

no I did not - until now. In the manual I misunderstood the first sentence of 
this chapter:
"is normally done at assembly time or by the factory." So I skiped this step :-(
I did it now - and it seemed to help.
 
> However, for best initial power-setting accuracy in SSB modes and in 
> DATA A and AFSK A, I'd recommend doing a quick TUNE. This is more 
> accurate than setting the POWER control, which at present uses a lookup
> table to determine the approximate drive value required.

I limited the tune power to 8 Watts - my automatic tuner does not need more 
to tune. When I set Tuner power to normal, the output power I see on the 
wattmeter corresponds very well with the K3 setting. 

Another observation: the ATU problem seems to be solved now.
I don't know how this is linked, but it seems to work now, when I set the 2.7 
filter frequency offset to its correct value of -.89

thank you vy much, 

73! de Werner OE9FWV

-- 
Veni, Vedi, WeeWee: I came. I saw. I had to go. 


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