I'm in the process of trying to bring an early K2 (serial#653) kicking and screaming into the 21st Century, I'll also point out that I'm not the original builder of this radio.
For a while I've not been overly convinced about the sensitivity and dynamic range of this particular example, it hasn't helped matters that along the way in my investigations I found numerous build errors. Today my attention was drawn to the Noise Blanker option. I downloaded the manual and noticed there were some major differences between my example and that referenced in the manual. I have looked through the Elecraft website and found the archived manual for the main build but I can't find an archived manual for this particular example of Noise Blanker. I'm lucky in that I have a friend very local to me who is in the process of building a K2 and so this morning I had the opertuinity to try his more recent noise blanker board in my K2. WHAT A DIFFERENCE!!!! I would guestimate that there was a 25-30dB increase in performance when his noise blanker was installed. The biggest visual differences between the two boards are: My older example has variable capacitors for C3 and C5. Pins 3 and 4 of U3 are shorted together L1 and L2 are grey torroids, L1 having 13winding and L2 having 14 windings L3 is marked with brownish orangey paint and has 15 windings. I'm hoping someone maybe able to point me to an archived manual for this earlier version of the noise blanker so I can assertain if it is reworkable or whether a newer revision should be purchased. Regards Nidge (G0NIG) IO93dv -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Noise-Blanker-Revisions-tp6610439p6610439.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
