You did not say whether the PREamp was engaged. Without it, the internal noise is very low, and SHOULD be there to a mild degree. WITHOUT the preamp, AGC off, it takes to about noon for moderate noise audio. WITH the preamp, AGC off it takes to about 9 oclock for moderate noise audio. What I hear I call hiss, not hash.
If you engage the preamp you will normally hear significantly more noise. This significantly more noise SHOULD be there. It's a preamp, and a "quiet preamp" is the holy grail. A good preamp will increase the noise as you hear it, but it will increase the signal more. People use widely varying words to describe ""noise"". Here I would ask whether you are hearing hash versus hiss. Hiss sounds smooth but is noise. Hash as a noise has edgy or gritty components to it that are typically related to 60 Hz, 120 hz, or sometimes odd switching power supply. But on battery, as you describe, I hear only a hiss. At one point replacing the battery, I did something to the speaker (twisted it) where something was making contact as the cone vibrated, which added a hash-sounding element to speaker audio that was not in phones audio. I was able to twist it out. I have gotten hash off of a couple power supplies. Still the best and quietest is my ancient (20 years?) 3 amp Rak Shak 22-120A which powers the K2 with a trickle charge float voltage that keeps the battery topped off when K2 is off and will power 15 watts without complaint. 73, Guy On Wed, Feb 3, 2010 at 10:06 AM, richard gilley <gille...@verizon.net> wrote: > With so much talk on the K3 noise, AGC etc I thought I would ask if > the following is normal on a K2. Or do I have an issue with my build > 6732. > This K2 has the KSUB SSB and KPA100 additions. > With only battery power and ear phone connected; AGC off: AF fully > clockwise; RF gain fully ccw; cw mode; fltr settings 200,400, or 700. > any band, I hear a definite constant, fairly low level, hash. > > With RF gail fully clockwise and AF gain fully ccw, no hash is heard > until AF gain is advanced from 7 o'clock to about 8 o'clock. > > Would this be considered normal or do I have another issue to look into? > > Best regards > Dick AD1G > ______________________________________________________________ > 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 > ______________________________________________________________ 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
