[Elecraft] KSB2 problem status: befuddled

[Ron D'Eau Claire]

Your current readings don't look out of hand to me! 40 is normally higher
because that is the band that usually produces the greatest RF output. Your
readings are consistent with my K2. 

Interesting that you say the "output reads over 15 watts in all cases,..".
Few K2's make 15 watts on 10. Many are capable just over 10. When they do
produce more power they draw more current.  The current is proportional to
the actual power output. The maximum power output varies according to the
overall RF gain available in the transmitter strip and that tends to be
highest in the 7-10 MHz range. So in that range the current draw is the
highest too. 

Your current draw on 10 meters is consistent with an output of just about 10
watts output "wide open". 

I don't see how that's connected to your overcurrent with  the SSB module
plugged in, but it's an anomaly. 

Have you confirmed that your K2 internal current sensor is accurate by
putting an ammeter in the lead from the external power supply?

If it's okay, then there's little else but for your SSB module itself to be
making up the extra current draw. Something on that module is drawing more
current than it should.

Ron AC7AC


-----Original Message-----
Hi Don and all,

I have spent the afternoon looking for where I could have made a 
mistake on the 40m LPF circuit. I didn't find any obvious ones, the 
toroids came from 'The guy de Toroids' but I counted them all anyway, 
and they are (luckily!) correct. Same for capacitors. Did the run of 
voltage checks and didn't notice anything really wrong.

On cw, cranking the output knob to the max, the display readings for 
current are
80 3.22
40 3.36
30 2.84
20 2.38
17 3.08
15 2.84
12 2.62
10 2.42

Output reads over 15 watts in all cases, usually abt 15.2. This reads 
pretty much the same with or without the SSB module installed.

I take it from your comments that the fact that 40m is the highest cw 
reading, its indicative of something wrong. Looked at LPF and BPF 
areas. What should I expect on the amp readings, 2.35 on 40 and a 
gradual increase as I go towards 10m?

I could reinstall the resistors and jumper and take out the noise 
blanker module as thats something put in yesterday, I take it that I 
need to do that if I want to test without it?

I have boosted cal cur to 4.0 and still can get hi cur signal with 
output fully counterclockwise on both usb and lsb. I have been very 
happy working cw all week as it is (set the cal cur to 3.5 and it 
hasn't tripped yet).

Any more ideas to look at?


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