[Elecraft] 40 Meter Transmitter Alignment problems

[david-davis@att.net]

Hello All:

This is an update to a post I made the other day.  I am trying to perform the 
40 meter transmitter alignment.  When I get to the portion of the alignment 
that tells me to put the radio in <TUNE> mode and activate the build in watt 
meter.  I try to adjust L1 for maximum output but the power level stays at 0.1W.


I went through the troubleshooting section of the manual and made the requested 
voltage checks.  I made all the measurements using two different meters just in 
case one meter was bad.  The only one that was way off was D9 the expected 
measurement was 2.0 VDC and I measured .010 VDC.  I started to think that Q7 
and or Q8 were bad because I did not get the proper measurements when checking 
the transistors.  But WA7SPY had a spare set and we tested those and got 
similar readings. 

I then started looking through the scamatics and tested the transmit voltage 
measurements for Q5, Q6 and Q10 as listed in the DC voltage tables.  The 
following resulted:


Q5 :  B = 1.1 VDC expected 1.3 VDC,  C = 12.6 VDC expected 12.4 VDC,  E = .515 
VDC expected .6 VDC

Q6 :  B = .6 VDC expected 1.1 VDC,  C = 13.4 VDC expected 13.3 VDC,  E = 220.1 
mV DC expected .4 VDC

Q10 :  D = 1.57 VDC expected 1.6 VDC,  G = 7.4 VDC expected 8.1 VDC,  S = .95 
VDC expected 1.6 VDC

In summary it appears that I have good voltages from Q5 B,C,E and good voltages 
at Q10 D,G, and S but the base and emitter from Q6 are way down from the 
expected voltages.


I have checked the winding counts for T1 and T2 and they seem to be wound 
correct.  I checked to see if I had an open through T1 or T1 but they seem good.

Does anybody have any suggestions where I should go from here?  Am I even on 
the correct path?  Any help would be greatly appreciated.

Thanks
David Davis, KG6MTI
david-davis@att.net