for your help, Don.
Bill, VE2WMA
-Original Message-
From: Don Wilhelm [mailto:w3...@embarqmail.com]
Sent: Thursday, January 30, 2014 4:50 PM
To: William Moore; d...@w3fpr.com; elecraft@mailman.qth.net; 'Mike Harris'
Subject: Re: [Elecraft] [K2] K2-100 Test and Alignment Issues
Bill
PM
To: William Moore; d...@w3fpr.com; elecraft@mailman.qth.net; 'Mike Harris'
Subject: Re: [Elecraft] [K2] K2-100 Test and Alignment Issues
Bill,
Regarding T4, there is one other possibility that I did not mention before.
If the direction of the windings is not as shown in the manual, it will work
To: William Moore; elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K2} K2-100 Test and Alignment Issues
Bill,
For the J3+ lead, I think the PA transistors may be producing that voltage
in response to light shining on them. Shield the transistors from light and
see if the voltage changes - if so
Bill,
Regarding T4, there is one other possibility that I did not mention
before. If the direction of the windings is not as shown in the manual,
it will work backwards which may be what you are observing.
As for the minimum voltage of 1.4 volts, that is WAY too high. The
bridge should
As John has pointed out, the problem can be anywhere in the KPA100
wattmeter circuit consisting of T4, C1, C95. R28, R29, D16, D17, R26,
R27, U5. R24. R25, Q10, Q11, and U6. With a bit more information and
some measurements that I can suggest, the field of suspect components
(and soldering
Bill - I had this exact problem on my K2/100 during testing. Changing
C1 varied the power output, but the SWR was fixed at 9.9-1. The problem
was a short between the output of the two op-amps U5A and U5B that
amplify and buffer the forward and reflected voltages before they go to
the
I am now into the test and alignment phases of my just constructed KPA-100
amplifier to be integrated into K2 #3842. Right from the start of this
phase, I have run headlong into a two issues I just can't figure out.
I am constructing from the Revision G September 2010 manual. On the page 47,
the
By the way - adjust C1 with a non-metallic screwdriver. Both sides of
C1 are above ground.
73,
Don W3FPR
Bill,
For the J3+ lead, I think the PA transistors may be producing that
voltage in response to light shining on them. Shield the
Bill,
For the J3+ lead, I think the PA transistors may be producing that
voltage in response to light shining on them. Shield the transistors
from light and see if the voltage changes - if so, ignore it.
As for the C1 adjustment - do the following steps in order. Preset R26
and R27 to
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