[Elecraft] K3 : AM synchronous detection
Ron D'Eau Claire
ron at cobi.biz
Sat Jan 12 13:18:48 EST 2008
Hello Dave:
The errata with the list of features is the one you should have received
with the Owner's manual. The current one on the Elecraft web site is C1-1
dated Nov 18.
http://www.elecraft.com/manual/K3%20owner's%20man%20errata%20C1-1.pdf
It sounds like you were looking at the errata sheet for the Kit assembly
manual.
I have a 6 kHz filter as well, and for best audio fidelity I use a SSB mode
to listen to broadcast AM. The excellent stability and high tuning accuracy
of the K3 means I just punch in the frequency I want and even music is
within one or two Hz of the right frequency - much too close for me to hear
any tone error.
As Lyle noted, the I.F. bandwidth of an AM signal is *twice* the audio
bandwidth since there are two sidebands that must fit through the 6 kHz
filter bandpass on an AM signal. I find that's FB on Ham AM signals, but
those commercial AM stations who make full use of their 5 kHz audio
bandwidth are cut off at about 3 kHz in AM mode. Gong to SSB mode with the 6
KHz filter allows the full audio bandwidth through.
Ron AC7AC
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