Snowy,
I am glad to hear that it is now working for you. It sounds like you
had a soldering problem somewhere.
A surplus of solder usually means that the lead and solder pad were not
heated sufficiently.
If you have other areas where you find excess solder, just reheat and if
necessary, wick
Good Evening Don
Sorry for the late reply, not used to the format of the reflector and stumbled
onto your suggestions to solve my BFO problem.
I am please to say that I have now got it working correctly.
Getting nowhere with the test I decided to dismantle the radio down to just the
RF board,
Snowy,
It sounds as though you have the proper BFO crystals installed at X3 and X4.
Do check the values of C173 and C174 first
Then check L33 to make certain it is well soldered and the leads are
attached to the 1/8 watt resistor leads.
Check D37 and D38 to be certain they are oriented
having repaired my PLL problem with a great deal of help and advice from
Dave at tech support, Elecraft i moved onto the next set of tests which
was the bfo frequencies, on selecting CAL, Counter i get a reading of
4.9136, on pressing either the band up or down all i get is zero's.
Fitted
Symptom:
K2 with very low audio output, only the strongest stations can be copied.
Have eliminated the BPF, attenuator, pre-amp, and so forth with signal tracing.
Transmit stops increasing at about 4W, the control runs out of effect.
So the K2 is alive, but something is wrong in the signal path.
Tyler,
Since you have low audio output during receive, I would suggest you are
looking in the wrong place.
Q24 is not involved during receive, and will show no signal at TP2
during receive.
The 400 mV at the gate of Q24 is just fine. Put the K2 menu into CAL
FCTR and then check the RF
[mailto:w3...@embarqmail.com]
Sent: Monday, July 19, 2010 9:06 AM
To: Ken Mohler
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 BFO problem
Ken,
You are likely chasing a bad solder connection - things that change by
themselves is usually an indication of a solder problem.
You are getting
: Saturday, July 17, 2010 7:57 PM
To: Ken Mohler
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 BFO problem
Ken,
The fuzzy waveform on the 'scope is normal - but how much so is
difficult for me to say whether yours is normal or abnormal.
Check the value of C169 - it should be 390 pF
: Friday, July 16, 2010 6:49 PM
To: Ken Mohler
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 BFO problem
Ken,
Did you obtain a good frequency reading when you did the PLL Reference
Oscillator test back on page 36? If so, check the probe again by
putting the probe into either TP3
Ken,
Make sure you have your probe plugged into the correct jack. Sounds
like what first happened to me, until I turned the rig around (back to
me) I forgot there were 2 jacks. Probably not the problem, but hey,
you never know.
John
K2QY
@mailman.qth.net
Subject: Re: [Elecraft] K2 BFO problem
Ken,
Did you obtain a good frequency reading when you did the PLL Reference
Oscillator test back on page 36? If so, check the probe again by
putting the probe into either TP3 or TP1. If you see a valid frequency
displayed, your probe is OK
, July 16, 2010 6:49 PM
To: Ken Mohler
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 BFO problem
Ken,
Did you obtain a good frequency reading when you did the PLL Reference
Oscillator test back on page 36? If so, check the probe again by
putting the probe into either TP3 or TP1
Hi Gang -
I'm building my 2nd K2 and am at the point of Alignment and Test, Part II.
All of the tests and alignment steps through the VCO alignment have been
completed successfully. Everything has been right in the center of the
expected parameters. Then I got to the BFO test. I'm getting a
Ken,
Did you obtain a good frequency reading when you did the PLL Reference
Oscillator test back on page 36? If so, check the probe again by
putting the probe into either TP3 or TP1. If you see a valid frequency
displayed, your probe is OK.
The most common problem builders have are
Greetings everyone,
I have a 4+ year old K2 which has provided spotless service for me until
recently. I began to have an audio issue in that on power up I would not
have audio. I could get it back intermittently by either powering down and
back up or by switching through the modes.
In
Jim,
That behavior is indicative of a bad solder connection. The main
components in the BFO area are X3 and X4, C173 and C174, D37 and D38,
L33, and RP6. The path to the TP2 BFO counter probe also includes Q24,
C169, R98 and C168, but since the problem seems to be frequency
oriented, I
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