XG1 and K2 Signal Tracing

[Tom Mc]

Hi gang,

  I bought and built the K2 with the idea that I'd not only have a pretty
decent rig, but that I'd also learn something along the way.

  With that goal in mind, and realizing that I certainly have a lot to
learn, I'll respectfully ask the members of this list, what probably is a
pretty basic question:

  I've also built the XG1 signal generator and would like to trace the
signal through my K2.  I've read through the Troubleshooting section of the
K2 Manual (Revision B) and it explains how to build a signal generator.  Of
course having the XG1, I didn't build the one in manual.  However, the
signal generator shown in the manual seems to have a variable output.  For
example, step 5 in the low pass filter section (page 11 of the
troubleshooting section) says to adjust the signal generator to 0.14 Vrms
and then check various pins to see if the voltages are at certain levels as
described in the manual.

  The XG1 is not variable in its output, so would the voltages be more or
less in the same proportion to those in the manuals which started with a
signal of 0.14 Vrms? (I'll be honest I didn't check the XG1 to see what the
Vrms output is on it.)

  Or is there a better approach I should be taking to this whole thing?  As
I said earlier, the K2 is working fine, I just would like to poke around and
see if I can wind up learning something when I'm done.

Thanks for any help or ideas you might have to offer.

Tom
WB2QDG
k2 1103



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[wayne burdick]

On Aug 10, 2004, at 6:04 PM, Tom Mc wrote:

>   I've also built the XG1 signal generator and would like to trace the
> signal through my K2.

Hi Tom,

The signal put out by the XG1 is so low in amplitude that the only
point in the circuit you can trace with it is the audio amplifier, and
perhaps the output of the product detector. It is intended for
calibration at signal levels usually only seen in on-air operation (1
to 50 microvolts).

If you'd like to trace signals through the rest of the receive chain,
you'll need a signal in the 10s or 100s of millivolts. That's where the
oscillator in Appendix E comes in. We provided a full list of
signal-tracing points based on the use of this oscillator and the RF
probe supplied with the K2.

73,
Wayne
N6KR


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