I have K2 #1239. I did all the A to B mods, and the rest of them, and added the DSP. Made a huge difference by my reckoning. I did them all at once. Gl & 73, Guy.
On Thu, Feb 23, 2012 at 10:14 PM, Don Wilhelm <[email protected]> wrote: > Eric, > > I really cannot associate any change in sidetone pitch ("chirp") with > the change of RF and AF gain pots, but I would strongly recommend that > you add the sidetone pitch (10k series resistor and 82 mHy shielded > inductor) changes to your Rev A K2 to give a better sidetone pitch. In > fact, I would recommend all the K2 A to B mods including a crystal > change if your K2 SN is less than 2560. > > The Alternate AF Gain Wiring Mod will not alter the "chirp" behavior, > but it will preserve your AF Gain control for the future. The mod > removes the DC current flow through the AF Gain control and will prolong > its life. > > Actually, I would recommend that you install all the A to B mods > (including the optional ones) on your K2. While not mandatory, you will > notice a difference in your K2 performance - it is well worth the effort > - include the Thermistor upgrade and the K2 Keying Waveshape Mod to make > things complete. > > 73, > Don W3FPR > > On 2/23/2012 9:35 PM, William Eric McFadden wrote: > > My K2 has recently begun making a slight bit of a "chirp"-noise in my > > headphones on the T/R transition when I do CW. Not a chirp in the classic > > CW sense of the word, when the other guy hears it, but a little bit of a > > tone in my own headphones. > > > > My K2 is a 10-watt "rev A" unit, firmware revision 2.04P 1.09 with KSB2, > > K160RX, KAT2, and KNB2 options. The only thing I've done to the rig > > recently is to replace the AF and RF gain pots and I didn't notice this > > "chirp" phenomenon until sometime after I replaced the pots. This K2 does > > not have the alternate AF mod installed. > > > > I've noticed this phenomemon in 80m CW, and I key with a manual key. I've > > heard it with crystal filter settings of 700 and 400Hz. It doesn't seem > to > > matter if I have AGC set to fast or slow. I do tend to have the RIT > > engaged--my QSO-buddy's old OMNI D has a bit of drift. > > > > Any suggestions? Did I break something when I replaced the pots? > > > > Tnx es 73, > > http://home.frognet.net/~mcfadden/wd8rif/radio.htm > > > > Eric, WD8RIF > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
