Posted by
Don Wilhelm-3 on
Apr 29, 2006; 2:18am
URL: http://elecraft.85.s1.nabble.com/K2-Alignment-ACCURACY-tp389212p389214.html
Mike,
I agree, I personally use a 'scope with its 10X probe connected directly
across the dummy load for my peak indicator - just watch for the highest
deflection on the 'scope and it is 'Spot On' - easy and no ambiguity.
For those not having access to an analog indicator, the K2 display does work
fine, but one must tune slowly because the digital display takes a bit of
time to 'catch up' - with fast tuning, the peak can be missed.
Bottom line - if you have anything analog that will indicate the peak, use
it, the peak will be more obvious than with the digital display. That
includes inserting an analog SWR meter in-line with the dummy load - no
matter that the SWR meter or Wattmeter is inaccurate, you are interested
only in the peak when doing this tuning, not the absolute power (measurement
of the power comes later).
The original question was about determining the peak during the receive
pre-alignment, be aware that this is only a preliminary alignment, the
better (more precise) alignment will be done using Transmit, so if one gets
the receive pre-alignment reasonably close to correct, the final peaking can
be easily done with the transmit alignment.
73,
Don W3FPR
> -----Original Message-----
>
> G'day,
>
> | L's - and the LED Display changes little or flickers
> | side to side. An analog display, or meter would seem
> | so much more accurate.
>
> Spot on.
>
> Digital displays are rubbish when it comes to peaking anything. It is so
> much easier to peak the swing of a meter needle than follow changing
> numbers or coarse steps on a bar display. I did all my band pass filter
> tuning on TX using a WM-2 watt meter. Smooth an' easy.
>
>
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