[Elecraft] Hi-Cur problem

2004-12-15 Thread Ron W

Hi,
 I have been building a K2/100 for a friend, and it has all been going 
very smoothlyuntil tonight.
I had the amp installed and it put out the output it should on all bands, 
but I didn't have the power calibration as good as I liked so I took the 
amp out, removed the shield and set it up along-side the K2 ready to adjust.
Set to 5w, press tune on 40m and the HI-CUR warning comes up. I then find 
it does that on *all* bands EXCEPT 80m.

I take things apart and find it is a problem in the basic K2 ( #4506)
Time for bed here and I am not thinking straight, but that has me bluffed 
at present.
I am assuming the problem is most likely in the LPF as the amplifier must 
be looking into a short or open cct.
Can anyone come up with a thought or two as to what has gone wrong? The 
relays seem to be switching as I change bands.
I have been over both sides of the RF board with a head-band magnifier...it 
eludes me at present!

Cheers...Ron ZL1TW

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Re: [Elecraft] Hi-Cur problem

2004-12-15 Thread W3FPR - Don Wilhelm

Ron,

If you are certain it was producing near to full output with the KPA100 
installed, then I would conclude that something happened when you removed 
the KPA100.


I would be looking for something like a short in the coax or its connector 
or something equally 'dumb' like that.  OTOH, Hi-CUR usually does indicate a 
problem with the LPF, but if it is showing up on all bands except 80 
meters --- that would mean that all the other low pass filters suddenly 
changed, and that is not probable.
Perhaps a bit of wire came loose as you removed the KPA100 - try a bit of 
'upside-down shaking'.


Did your power supply voltage sag somehow?  Do you still have a nice low 
resistance at the power connector?  Look for things of that nature before 
digging too deep into the K2 itself.


Perhaps it will be more clear after a bit of rest. Good luck!

73,
Don W3FPR

- Original Message - 


Hi,
 I have been building a K2/100 for a friend, and it has all been going 
very smoothlyuntil tonight.
I had the amp installed and it put out the output it should on all bands, 
but I didn't have the power calibration as good as I liked so I took the 
amp out, removed the shield and set it up along-side the K2 ready to 
adjust.
Set to 5w, press tune on 40m and the HI-CUR warning comes up. I then find 
it does that on *all* bands EXCEPT 80m.

I take things apart and find it is a problem in the basic K2 ( #4506)
Time for bed here and I am not thinking straight, but that has me bluffed 
at present.



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