[Elecraft] KX1 sn 379

[Ron D'Eau Claire]

Thanks Rick! That's good to know about letting the inductors lean into =
each
other that way causing problems. I hadn't run into it before.=20

Yes, there is variation in the output from one KX1 to another. I think =
Wayne
said one of the preprod models hit 5 watts like yours does. Of course =
the
difference in S-units is miniscule. Also, you will notice that the =
variation
NOT as great at the lower power output you get with the internal =
batteries.
The output network actually provides a closer "match" at the lower power
level, I believe.=20

The relative variation you see is "right" for every KX1 that I've seen
numbers for - 30 meters is the "hottest" with 40 next in line and then =
20.

Now it's time to put it on the air and have a new kind of fun <G> If you =
do
see something interesting on the Spectrum Analyzer, please send it =
along!

73,

Ron AC7AC

-----Original Message-----

... After looking at the main board again, I notice L1 was essentially
leaning against L2.  After twisting the two slightly so they were at 45
degrees to the back of the board and with some separation, the note on =
20
meters sounds much better with the turns on L2 adjusted according to the
manual.  Apparently, it was some coupling between the two inductors that =
was
causing the problem.

Mind you, the values below are from the ATU only adjusted according to =
the
manual, so they're only in the ball park, not adjusted to a calibrated =
watt
meter.  After "calibrating" my NoGA watt meter to the ATU, I get results
consistent with the ATU.  (Someday I'll get these things REALLY =
calibrated.)

With 12.3 VDC during transmit from a gelcel:
7100 =3D 4.1 W
10106 =3D 4.7 - 5.0 W
14100 =3D 3.5 - 3.8 W

At least they now look a lot more reasonable, if not nearly identical =
with
your values.

I'll see if I can sneak some time at work in the next couple of days to =
see
what the output looks like on the spectrum analyzer for the three bands. =
 If
I see anything unusual, I'll send you a screen shot.  Thanks for taking =
the
time to dig up the spectral purity numbers for me.  That was a real
time-saver.

Rick, WD8KEL