[Elecraft] Checking KPA relays

[n0jrn]

 OK,            Back in the shack and checking the LPF of my KPA100.    Per 
Don's direction,   I disconnected the amps RF line from the main board of 
the K2 and installed a 50 ohm resistor in the plug end of the RF line.

( resistor measure 50.5 ohms per my DMM )

Hooked my MFJ 259B  to the PL259 on the KPA100 and checked results of the 
low pass filter set up on each band.

Results as follows:

160 Mtr           1.8         1.2-1          45 ohms
                        2.0         1.2-1          49 ohms

80 Mtr             3.5         1.3-1          53 ohms
                        4.0         1.3-1          49 ohms

40 Mtr             7.0         1.2-1          41 ohms
                        7.4         1.2-1          41 ohms

30 Mtr             10.1        1.4-1         50 ohms
                       10.150     1.4-1         50 ohms

20 Mtr            14.0         1.2-1         40 ohms
                       14.4         1.1-1         40 ohms

17 Mtr            18.065      1.2-1        37 ohms
                       18.2          1.2-1        37 ohms

15 Mtr             21.100     1.3-1        35 ohms
                        21.4         1.3-1        34 ohms

12 Mtr             24.890     1.2-1        35 ohms
                        24.990     1.2-1        35 ohms

10 Mtr             28.0          1.3-1        33 ohms
                        28.3          1.3-1        33 ohms
                        28.9          1.3-1        33 ohms

Becomes obvious that K3 - K12 are switching and the filters are intact.

Just a quick recap on the problem I have with my KPA100,   while trying to 
do the Transmit tests on page 50 of the KPA manual,  something is causing 
the KPA100 and / or the K2 to drop out of TX around the 35 watt level on all 
bands.

I've read as much as can be found in the archives on this and similar 
issues.  I know I've got to go back and reset the bias of the amp to insure 
it is correct.

I'll retest the output from there and see if I've gained anything.

FWIW,     I am using a quality watt meter in line with my dummy load.  The 
watt meter agrees with the K2's displayed results relative to the amount of 
output and reflected power.

I have reset C1 a couple of times and I've been working with R26 to see if I 
can gain any improvement with it's adjustment.   ( I can get to around 50 
watts on the lower bands by working with R26 but my requested power and 
actual output are off quite a bit when I do that )

SO,    for tonight's activity !

I'll recheck the bias settings,   check voltages at D11 through D14 and 
recheck T4.

Any other suggestions would be great.

I'll let you know what I come up with.

73         Jerry             N0JRN