Posted by
Don Wilhelm-3 on
Apr 28, 2006; 4:52am
URL: http://elecraft.85.s1.nabble.com/K2-Alignment-ACCURACY-tp389212p389215.html
Fred,
You can use your ears rather than the S-meter - just tune for the strongest
signal strength. Close your eyes and listen, you should hear a peak as you
rotate the inductor slug (or capacitor trimmer). You should be able to
resolve the peak within about 1/4 turn with just your ears. The peak on 80
meters is a bit more broad than the peak on other bands.
If you get the tuning anywhere close, that should be good enough for now,
read the title on page 76 literally, this is PRE-ALIGNMENT. When you turn
to page 77, you will be tuning the same inductors and trimmer caps using
transmit mode, and the indication is much more precise than for the receive
pre-alignment. If you did the steps for 40 meters on page 75, you should
already have a sense for the process - the procedure for the other bands is
similar to that used for 40 meters.
Your 12 foot copper wire is not really a very good antenna, and you will
likely hear only a few signals (perhaps none at certain times of the day) -
when you connect a good outdoor antenna tuned properly for a 50 ohm
impedance, you will hear a lot more.
73,
Don W3FPR
> -----Original Message-----
>
> I've got the base K2 # 5422 built - and am doing the
> "Alignment & Test, Part III" - Receiver Pre-Alignment,
> Transmitter Alignment (page 74):
>
> The difficulty I'm finding: It seems like the whole
> testing and "peaking" adjustment, is based on BAR
> GRAPH 10-LED Display and tweaking the various L1/L2,
> L3/L4, C21/C23, L8/L9, L10/L11, C32/C34, L12/L13,
> and C44/C46. There seems to be so much slop in the
> various L core adjustment - one can turn one of the
> L's - and the LED Display changes little or flickers
> side to side. An analog display, or meter would seem
> so much more accurate.
>
> It almost seems like one could mis-adjust L3, or
> any of them - by as much as a 1/2 turn - based
> solely on what the flickering of the 10-LED
> display looks like.
>
> Is there a better way of peaking and checking,
> when I attempt this?
>
> I've gone thru this process twice. On 40 - I
> can copy CW and some SSB sigs too. (12' copper wire
> antenna)
>
> Thanks,
> Fred N3CSY
>
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