KX-1 Power Output Help?

[Coote, Jay]

I am assembling KX1 #1204 and nearly there.  While going through the
power output tests, I notice that power on 7 MHz is 4 watts, while power
on 14 MHz is only 2.5 watts.  Watts up with that?  I've tried
expanding/compressing turns on L1 and L2, T1 as well as changing R11 and
R30- plenty of power output, but 14 MHz is consistantly lower output
than 7 MHz, whatever I do.  Yes, the turns counts on L1, L2 and T1 are
correct.  I went over the digests and saw people getting consistant
output on all bands... Any suggestions or help?
Thanks
Jay
W6CJ
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[Ron D'Eau Claire-2]

Jay W6CJ wrote:

I am assembling KX1 #1204 and nearly there.  While going through the power
output tests, I notice that power on 7 MHz is 4 watts, while power on 14 MHz
is only 2.5 watts.  Watts up with that?  I've tried expanding/compressing
turns on L1 and L2, T1 as well as changing R11 and
R30- plenty of power output, but 14 MHz is consistantly lower output than 7
MHz, whatever I do.  Yes, the turns counts on L1, L2 and T1 are correct.  I
went over the digests and saw people getting consistant output on all
bands... Any suggestions or help?

----------------------------------

The design of the output filters dictates that the output on 20 meters will
be 0.3 to 0.6 watts below 40 meters (see "40 meter transmitter test" on page
59).

Your first statement suggests more difference than that, but then you said,
"...plenty of power output, but 14 MHz is consistantly lower output than 7
MHz, whatever I do."

Is the difference still more than about 0.6 watts?

Expanding the turns on L2 may increase the 20 meter output, but at the cost
of harmonic suppression.

Ron AC7AC



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[Ron D'Eau Claire-2]

Jay W6CJ wrote:

I am assembling KX1 #1204 and nearly there.  While going through the power
output tests, I notice that power on 7 MHz is 4 watts, while power on 14 MHz
is only 2.5 watts.  Watts up with that?  I've tried expanding/compressing
turns on L1 and L2, T1 as well as changing R11 and
R30- plenty of power output, but 14 MHz is consistantly lower output than 7
MHz, whatever I do.  Yes, the turns counts on L1, L2 and T1 are correct.  I
went over the digests and saw people getting consistant output on all
bands... Any suggestions or help?

----------------------------------

The design of the output filters dictates that the output on 20 meters will
be 0.3 to 0.6 watts below 40 meters (see "40 meter transmitter test" on page
59).

Your first statement suggests more difference than that, but then you said,
"...plenty of power output, but 14 MHz is consistantly lower output than 7
MHz, whatever I do."

Is the difference still more than about 0.6 watts?

Expanding the turns on L2 may increase the 20 meter output, but at the cost
of harmonic suppression.

Ron AC7AC



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Post to: [hidden email]
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Subscriber Info (Addr. Change, sub, unsub etc.):
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Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com