[Elecraft] KXPA100 Kit problem, need help !!!

[VA2SS]

Hi,

I just received my KXPA100 + KXAT100 yesterday.

After a careful building session. I did a few tests.

Frist of all, I use a 300W dummy into my Elecraft W2 power meter for power
accuracy reading, so no antenna at this point, no PC cable, only the basic
connection.

The parameters in the KX3 : PA MODE = ON..... when set to OFF, the KXPA100
is acting as it should.
The TUN PWR = normal. 

The KX3 show the TEMP of the KXPA100 = OK.

I put the KX3 at 5W, hit the TUNE button on the KX3 = 5W, SWR reading OK.
Power meter W2 reading OK. So, the antenna tune seems to act as normal
without any doubt.

The worst part...... Now put SSB, if I push the PTT without talking, I get a
steady 5W power reading on the W2.... yes in SSB without talking !! Northing
could be heard on my receiving K2 that is beside the KX3.

If I put the KX3 at 10W, hit the TUNE button.... I get a result of 8-9W. But
again,in SSB !!!

And the worst part, if I set 11W on the KX3, all the same tests give me a
result of a steady 80W output, no matter if I set 11W thru 100W it stills at
80W !!! Even if the mode is SSB or CW.

I monitored myself in my good old K2. If I use only the KX3, everything
works as it should. But immediately when and I turn on the PA in the KX3
menu and I try to transmit, I cannot hear anything in my K2, no matter the
power I choose, even with less than 5W or 3W..... the KX3 cannot be heard in
my K2.

The only way to hear myself is when the KXPA100 is disengaged in the menu or
switched off.

All basic tests to showed me good communication between the KX3 and KXPA100,
all went good.

Another important thing, the receive RX part when antennas are connected
thru the KXPA100 is OK..... the reception RX with or without the KXPA100
engaged (ON or OFF) is OK. The strange problem seems to be only in TX.

I really need help on this one.

Thanks in advance.

73

J-F VA2SS




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