K2 -- RX audio
Posted by
Marteinn Sverrisson on
Oct 31, 2007; 5:48pm
URL: http://elecraft.85.s1.nabble.com/K2-RX-audio-tp455255.html
Hi
While trying to improve the K2 RX audio response specially for SSB,
I noticed lack of low frequencies, looking at the schematics I find
the the LP cutoff is abt 640 Hz, determined by C25, C26 and the 5k vol
pot ( this is wheather using DSP or not).
By increasing C25 and C26 to 0.2uF (from 0.1uF) the LP cutoff is
moved to abt 320 Hz. This makes better sounding SSB signals and also helps
in CW mode when copying low pitch signals.
To lower the LP cutoff, I soldered 0.1uF SMD caps across
C25 and C26 on the control board. To my ears K2 now sounds better.....
73, Matti
ps. I use 2.4 kHz X-Tal filter
--
Marteinn Sverrisson TF3MA
Langitangi 2 Internet: tf3ma [at] raunvis [dot] hi [dot] is
270 Mosfellsbær
http://www.raunvis.hi.is/~tf3ma Iceland
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