Posted by
Ron D'Eau Claire-2 on
Aug 08, 2006; 5:06am
URL: http://elecraft.85.s1.nabble.com/Re-Wha-ts-Wrong-With-Our-Radios-WAS-NewProducts-Building-Demo-tp392768p392782.html
Others pointed out the reason - single conversion design. That
single-conversion design is also what helps the K2's performance excel
compared to those with multiple-conversions that allow for an "IF Shift"
knob. Frequency conversions in receivers are like making copies in
photography. You can go to great extremes to make each copy very high
quality, but each generation degrades the image, just the same. In a
receiver, every conversion degrades the performance, no matter how hard the
engineers try to avoid it.
But all is not lost. You CAN do IF Shift with a K2 to a limited extent: I
do. I assume you're talking about SSB since IF shift on CW is pretty
meaningless. On SSB you have only one filter setting, so you have three more
positions to play with. Select OPT1 for your filter for each FL setting, but
adjust the BFO frequency as you desire to alter the position of the passband
with respect to the carrier as you want.
Then, if you want to shift the passband around, just punch the FILTER button
so move to a different position. It will affect ONLY the received signal,
since the K2 reverts to FL1 for transmit, no matter which FL position you're
using for receive.
Ron AC7AC
-----Original Message-----
Bit by bit I learn K2 is loaded with quality not commonly found in other HF
ham gear. Why no ( real.. ) IF shift ? ( common in all " other " rigs , even
my cheap FT-100's ).
Peter, PE1E
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