[Elecraft] KX1 sn 379

[Rick Hampton]

Hi, Ron.

Well, yes, but not exactly as described.  I adjusted the toroid with the
xmitter
connected to a dummy load, while listening to the signal on another
receiver.
Frankly, the signal sounded bad, as though it was being modulated, so I
adjusted
the toroid until I had a clean-sounding signal.  There is no doubt in my
mind
this is the reason the power is low.

The question in my mind is whether or not the sound of the signal is
indicative
of not enough spur suppression or some artifact from too tight of a
coupling
between the receiver and transmitter when I was making the adjustment. 
(I had a
receive wire laying across the coax going to the load during the test.) 
I'm
thinking about borrowing the spec analyzer from work in a couple of days
to look
at the output while I try adjusting it again.  Could you remind me what
the
spec's are for harmonic suppression?  I can't remember them off-hand.

Rick Hampton, WD8KEL

Ron D'Eau Claire wrote:

> Rick, did you adjust the turns on the toroid as described in the manual to
> balance the output at 40 and 20 meters?
>
> KX1 S/N 0004 gets:
>
> 40 meters
> 4.0 watts at 13.8 vdc
> 1.1 watts on internal AA alkaline batts.
>
> 30 meters
> 4.7 watts at 13.8 vdc
> 1.4 watts on internal batts.
>
> 30 meters
> 3.5 watts at 13.8 vdc
> 0.9 watts on internal batts.
>
> Ron AC7AC
>
> -----Original Message-----
>
> By the way, I too would like to know from others what kind of output powers
> you are seeing.  The manual says, "With L2 at its optimal turns spacing (for
> best harmonic rejection), 20 meter output will be about 0.3 to 0.6 watts
> lower than 40 meters."  Also, "...40-meter power output [should be] 3 to 4
> watts with a 12-14 V supply...."
>
> Half a watt, I expected.  Half power, I did not.  Since I'm not playing
> hard-core QRP yet (Give me some time, OK?), I'd like to have the extra watt
> or two if I can get it.
>
> Rick Hampton, WD8KEL