Mike,
The only 2 things in the receive path that differ substantially from
band to band is the Low Pass Filter and the Bandpass Filter. Unless the
"component" you refer to is a part of those filters, it is unlikely to
be a component problem.
It would seem that you have a problem with one or the other. Further
testing with an RF Probe or an oscilloscope and a strong signal
generator may reveal which one. The XG3 may have enough output for
investigation with a 'scope, but I doubt it is strong enough to use an
RF Probe.
Yes, you may wish to take the easy path and have Elecraft check and
align it - contact [email protected] if you wish to start that process.
73,
Don W3FPR
On 9/11/2014 1:37 PM, Mike Sullivan wrote:
I got one response from Don W3FPR who indicated I should try S-Meter Config MD: to ABS "which
causes the S-Meter reading to stay fairly constant but require SMTR OF and SC to be
re-aligned" and to "find a happy medium for the setting".
The K3 internal Tuner was bypassed.
I did that and have prepared the following table of observed S meter values
(utilizing the XG3):
Band -73 dBm -33 dBm
160 S9 S40
80 S9 S40
40 S9 S45
30 S9 S40
20 S4 S10
17 S9 S40
15 S9 S40
12 S9 S40
10 S9 S40
I did double check the XG3 with the Rigol Spectrum Analyzer and it was dead on.
The obvious question is why is the 20 meter results so different from the other
bands? I am enough of a purist to send the K3 back for a re-alignment, but
could an incorrect component been assembled on the receiver board?
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