Dan,
With a 13.8 volt power supply and working into a good 50 ohm dummy load
(without the KXAT1 installed) you should have at least 3.0 watts on all
bands (I normally expect 3.5 watts or more). Measure with an external
wattmeter that is has known accuracy at low power - many wattmeters with
a 20/200/2000 watt range switch are inaccurate at low powers and will
typically read lower than the actual power. That is typical of analog
meters, many with digital readouts are not as bad in this respect.
While 40 and 20 meters usually have lower power output than 80 or 30
meters, yours is extremely low.
You *will* find the problem is on the Low Pass Filter board.
Check it very carefully for toroid leads that are not well tinned and
soldered. If you see any evidence of wire enamel on the solder side of
the board, that lead was not well tinned before installation and must be
re-done.
Also make certain that the green lead on L2 that routes around to the
back of the board is not contacting the red lead #4 - check both the
front and back of the board.
You may have to remove the LPF board and re-wind the toroids.
73,
Don W3FPR
On 9/23/2013 12:24 AM, zan0416 wrote:
Finished a brand new KX1 this afternoon, with ATU and 3080 module.
Power output with 13VDC for all bands is as follows:
80 6.3 watts
40 1.7
30 4.0
20 3.0
Clearly something is amiss with 40 meters. I read somewhere to mess with
the green windings of L2 on the 3080 module, but that didn't seem to do much
other than make it worse. The number of windings on all the toroids have
been double-checked as correct.
Anyone have any ideas where to go from here? I don't have any test
equipment except for a DMM.
Thanks for any suggests you may have.
Dan, n0da
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