[Elecraft] K3 spurious radiation?

[Ron D'Eau Claire]

Yes. Experienced Hams know two things about bad reports:

1) Never EVER accept one station's report. All too often it's cockpit
trouble at the other end or a bad rx. That doesn't mean not to be polite.
But politely accept the report and go on to 2)

2) Check the report on your standby receiver. No standby or second receiver?
Then contact someone fairly close by and have them look for the same spurs. 

However, it's good Amateur practice to have a standby receiver. It does not
need to be "state of the art". If anything, the less "state of the art" the
better. A simple, single conversion superhet or direct conversion receiver
is best for looking to see if a reported spur is present because they have
the fewest internal spurious responses. Modern multiple conversion and SDF
receivers are always suspect when noting spurious responses. Top of the line
receivers, like the Elecraft rigs, are the least problematic, but I still
turn to a simple single-conversion superhet to see if there's a spur. Even a
single conversion superhet has spurious responses but, owing to its relative
simplicity, they are easy to anticipate with a little arithmetic. 

73, 

Ron AC7AC



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John/K8AZT
Sent: Tuesday, January 24, 2012 5:16 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 spurious radiation?

Thank you Tom, Geof, and Eduardo for responding.  I feel a bit better that I
am 
not alone experiencing this situation, however want to prove it is not from
my 
rig.  


I started wondering since the skimmer rx's are sdr's, this might have
something 
to do with digital sampling aliasing.  If the ADC's don't have sufficient 
anti-aliasing filters, strange results can result from not sampling at a 
sufficiently high frequency.  I wonder what the sampling frequencies are for
the 
sdr's used?  Something more for me to research.

Again, Tnx all for the input.

73,
John/K8AZT