[Elecraft] K2 Test 2 OK, Test 3 power output problem

Tue Jun 15 06:24:42 EDT 2004

Hi Don and Elecrafters!

I built RF-probe already and have done some measurements. I will look into
these measuremnts which Don recommended afterwards.

I did some DC-voltage checks last night. These are things I found to be
off in RX mode. Power supply about 12.5 VDC:

Control board (front panel removed)
U6 P18 5 V (should be 0 V)
U9 P1 0 V (should be 0.4* V)
U10 P1 0.07 V (should be 7.7* V)
    P2 0.01 V (should be 5.0* V)
    P3 0 V (should be 5.0* V)

RF-Board
Q2 D 0.02 V (should be 0 V)
Q17 D 1.5 V (should be 2-3 V)
Q18 G 0 V (should be -1.0 V)
    S 1.45 V (should be 2-3 V)
    D 7.6 V (should be 6.3 V)
Q21 E 1.35 V (should be 1.6 V)
    B 2.1 V (should be 2.3 V)
    C 11.9 V (should be 13.2 V)
U4 P2 0 V (should be 2.4 V)
U5 P1 5 V (should be 0 V)
   P2 0 V (should be 5 V)

According to some old postings I tested the 8R line (J13 pin1). It doesn't
go 0 V when TUNE is on. Same post pointed to U10A ALC-control and those
pins seem to be wrong. Also PA0V pointed me to this direction.

I already received advice from Elecraft's Gary and send this info to him
too.

73 de Jukka, OH4MFA

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