[Elecraft] K2: No recieve/power out on 20M thru 10M

[Marc Glade]

Don,

I did both of these checks as per your recommendation, all readings
came back normal for both VCO freq and voltage.

Marc W1RSC


On Wed, 10 Nov 2004 08:11:17 -0500, W3FPR - Don Wilhelm
<w3fpr at earthlink.net> wrote:
> Marc,
> 
> There is nothing in the bandpass or lowpass filters that would cause good
> behavior below the 10 mHz band and bad performance above that.
> 
> I suggest that one of the few things that could cause such behavior is the
> VCO.  Use CAL FCTR with the probe in TP1 and check the VCO frequency on
> those bands.  The frequencies should be close to those listed in the VCO
> Table of the K2 Schematic Key (appendix B of the manual).  Also, build the
> RF Probe and check the VCO voltage as indicated in page 10 of the
> Troubleshooting section (Appendix E).
> 
> 73,
> Don W3FPR
> 
> 
> ----- Original Message -----
> From: "Marc Glade" <mglade at gmail.com>
> To: <elecraft at mailman.qth.net>
> Sent: Wednesday, November 10, 2004 1:23 AM
> Subject: [Elecraft] K2: No recieve/power out on 20M thru 10M
> 
> >I am the proud owner of K2 #4360. When I first put the unit together
> > everything checked out smoothly and there were no issues. I have since
> > added the KSB2, KIO2, KAT2, K160RX, KNB2, K60XV, and KAF2. No issues
> > appeared to arise after adding the modules. I had to set the K2 aside
> > for a month due to other commitments and upon returning to it about a
> > month ago I noticed I had no power out on any band. A quick check and
> > replacement of R50 solved this. Except now I noticed that on 20M thru
> > 10M with a slight exception on 15M I still had no power out and also
> > that even with max AF gain the signal from a connected N-gen was
> > barely perceptible. 15M is a little different in that I can get a max
> > power out of 1.5W on that band and receive is also a little better but
> > not by much. On 160M thru 30M the rig functions perfectly fine. I have
> > tried re-aligning the bandpass filters multiple times to see if that
> > was were the problem was but could not resolve the issue. I have spent
> > hours looking over the rf board with a magnifying glass and a dmm
> > trying to find a fault or bad solder joint but haven't found anything.
> > My knowledge in this area is limited and I feel like I've run into a
> > brick wall with this issue. If there is anyone that has any
> > suggestions I eagerly await them.
> >
> > Thank You,
> > Marc W1RSC
> > K2 #4360
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