K2/100 HI CUR

[JohnChanceRead]

I have enjoyed reading the problems of others but now its 'the winter of my  
discontent' as they say.  
I've successfully built the K2, KSB, 160 converter, DSP and finished the  ATU
(needs testing and not connected). I am now finishing the K100
I have got to the end of the test where one fires up with 20W and I've got  
HI CUR.  I have gone through the tests 3 times now and  cannot see any
irregularities.  I have looked at R21-22 and T1  and turned R26/R27 slightly clockwise
as advise but still have the  problem.
I am feeding into 239 socket and 213 cable through a Kenwood ATU and then  
into Bird 500W load.  All tests are perfect of the K2.
I noted on my power supply source that when set to 20W the PSU is  delivering
about 3 amps.  The Kenwood Power Meter is not reading anything  much and the
K2 LCD shows   1.0-1.
Although in the production of electronics during my life, I left 'amateur  
radio' some 15 years ago when I went deaf.  I am now try to pick up the  threads
and I cannot remember how those funning things with three legs work  !!.
I would really appreciate some help here guys.
Regards John G4BOU
 
 
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[Don Wilhelm-3]

John,

First, check to be certain that you increased the CAL CUR setting to 3.5
Amps - the KPA100 adds to the current drain of the base K2 and the limit
must be increased from the default of 2.5 Amps.

Having said that, let's get down to some other 'facts' - first, the Hi-Cur
is only an indication that the base K2 is drawing more current than the CAL
CUR setting - there is usually no harm in setting the CAL CUR limit to
something above 3.5 Amps for troubleshooting purposes - if only to see just
how much current is actually being drawn by the base K2 - read the current
on the K2 display so you know how much current is actually being reported to
the K2 microprocessor.

Next, it would be of interest to know how much current the base K2 draws
when transmitting at full power into a 50 ohm resistive dummy load (KPA100
completely disconnected).

I will say that the most common cause of HI-CUR warnings is a problem in the
base K2 Low Pass Filter - check the toroids for the correct number of turns
and the capacitors for proper values.

73,
Don W3FPR

> -----Original Message-----
>
> I have enjoyed reading the problems of others but now its 'the
> winter of my
> discontent' as they say.
> I've successfully built the K2, KSB, 160 converter, DSP and
> finished the  ATU
> (needs testing and not connected). I am now finishing the K100
> I have got to the end of the test where one fires up with 20W and
> I've got
> HI CUR.  I have gone through the tests 3 times now and  cannot see any
> irregularities.  I have looked at R21-22 and T1  and turned
> R26/R27 slightly clockwise
> as advise but still have the  problem.
> I am feeding into 239 socket and 213 cable through a Kenwood ATU
> and then
> into Bird 500W load.  All tests are perfect of the K2.
> I noted on my power supply source that when set to 20W the PSU is
>  delivering
> about 3 amps.  The Kenwood Power Meter is not reading anything
> much and the
> K2 LCD shows   1.0-1.
> Although in the production of electronics during my life, I left
> 'amateur
> radio' some 15 years ago when I went deaf.  I am now try to pick
> up the  threads
> and I cannot remember how those funning things with three legs work  !!.
> I would really appreciate some help here guys.
> Regards John G4BOU
>
>
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> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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>
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