[Elecraft] Re: Debate K2 Pro Align and Test Data Issue
phoon.usinet
[email protected]
Mon Jul 28 14:50:01 2003
Peter (VE1CHS):
� >Where is the problem? Unless you have ac voltages, dc voltages, rf
voltages
> or power levels specified at many PCB pads, you have no way of comparing
> what you observe in your radio, with what should be there.
� Wayne (N6KR):
�
� I agree that additional data, for those who have access to
professional test
equipment, could be compiled and added to our manuals or to application
notes.
�
However, much of this data *is* already present in the manual. We believe
that
what is supplied is sufficient to determine whether a K2 is working as
specified.
�
� Wayne and Andy:
Appendix E of the K2 manual lists all DC voltages on diodes, transistors,
and
ICs, in both RX and TX mode where relevant, which covers about 90% of the
tie
points in the radio.
Appendix E also includes an extensive receive and transmit signal tracing
procedure that includes RMS voltages at all significant points in the signal
path, three full page tales with readings.
Peter:
Thanks Wayne and Andy for clairifying where this and more material on test
parameters
and trouble shooting is located in the latest manual revision, B.
I am impressed with what I studied over in this revision, and I want you to
know that I am
now highly encouraged about placing a K2 order in September. And I agree,
the data are
sufficient to check through a K2 and know that it is virtually "up to specs"
.
As you imply above, one item for the wish list: Some of the RMS voltages I
saw are very low.
From Roy Lewallen's discussion of his power meter construction article, I
recall that he shows
that the 1N34A diode (in the RF probe) is non-linear at low voltages. Thus,
it is hard to know
what the small RMS numbers really are here. So it would be desirable to
eventually express
your RMS in dBm, or, as Pk to Pk Voltages on a scope. Also, there may be
some scope
"snapshots" at various test pads, that could be helpful diagnostically in
future manual
supplementary material.
My best,
Peter, VE1CHS