Please multiply the voltage by 10 in the sentence below where I am describing the battery. I think I rushed to quickly to drop in that decimal point.
And, thanks for all the help and comments from others. I always learn a lot in these trials. phil On Jan 13, 2012, at 2:41 PM, Phil Hystad wrote: > Guy, > > Thanks for the comments. Later on I might experiment to see if I can > purposely reproduce the buzz by methods you mention. > > Yes, my test condition was using ABSOLUTELY no AC and no nearby AC or AC > artifacts. No charger on the battery but then again I had AC switched off at > the breaker panel during those tests. The leads on the batter were about 4 > inches long. The battery by the way was a 4S1P configuration (4 individual > cells) producing 1.38 volts of A123 Systems Lithium Nano-Phosphate battery > available for lots of money from Buddipole. I like them so much, I am > planning on buying more. > > phil > > > On Jan 13, 2012, at 2:34 PM, Guy Olinger K2AV wrote: > >> Let's call it buzz. If it was AC power hum the main components would be >> 60, 120 and 180 Hz. Cutting 400 Hz and below would have made it >> significantly better. When the K3 is running on batteries without ANY >> mikes and other connections, it has NO way to produce 60/120/180 Hz related >> to AC house voltage. (I am PRESUMING that your batteries did not have a >> charger running on them, or long leads. Anything connected to the charger >> is connected to the K3.) It DOES have misc low level processing artifacts >> that are normally so far down as to be covered up by the normal noise >> levels of anything coming in on audio inputs at routine levels. >> >> That said, what you have sounds more like gain gone to maximum looking for >> input when power level has never been defined, or has had all prior data >> wiped. Especially if compression is set to max, you will now have many >> dB's of amplification in force as the rig attempts to provide 100 watts of >> output with no power level or mic gain defined. >> >> Once you set yourself to something less than wide open on all bands and >> modes and inputs, and your compression to a realistic level that matches >> your voice and microphones, it will no longer be running "open gain" and >> amplifying internal circuit noise (always present in ANY electronic gear) >> to audible levels. >> >> 73, Guy. >> >> On Fri, Jan 13, 2012 at 5:11 PM, Jim Brown <[email protected]>wrote: >> >>> On 1/13/2012 10:30 AM, Phil Hystad wrote: >>>> I disconnected EVERYTHING. Nothing on the back panel of the K3 at all >>> except for a Li-nano-phosphate battery as my power source. >>> >>> Was your antenna connected? If so, where is the coax shield connected >>> to ANYTHING -- the earth, other gear, at a tower, etc.? These are all >>> paths for AC leakage current, and your K3 can be in that path. >>> >>>> All AC off at the breaker panel for this room. The only electrical >>> equipment on was my K3 via the battery and my Macbook Pro laptop via its >>> battery. >>>> >>>> Given those conditions, the hum was still there. >>>> >>>> Jim Brown suggested that I consider TXEQ to cut off the low frequencies, >>> I did max cut for all frequencies up to 400 Hz. The hum did not start >>> being attenuated until 400 Hz cut. But, max cut on 400 Hz did not >>> attenuate it completely. I did not do higher frequencies. >>> >>> Then what you have is BUZZ, NOT HUM. HUM would be affected ONLY by the >>> 60 Hz frequency band. The coupling mechanisms are entirely different. >>> That's why it was my first question! >>> >>> BUZZ is leakage current from the AC mains power, OR, as Ron suggested, a >>> flaky shield connection of the mic. BUZZ is almost never due to >>> magnetic coupling, so magnetic shielding doesn't matter. What DOES >>> matter is ELECTRIC shielding, which is what the cable shield provides. >>> And MAIN thing that matters is BONDING -- CHASSIS TO CHASSIS, and from >>> the combination of those chassis to the station ground, AND to the power >>> system ground. >>> >>> Study http://audiosystemsgroup.com/HamInterfacing.pdf >>> >>> 73, Jim Brown K9YC >>> ______________________________________________________________ >>> 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 > > ______________________________________________________________ > 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
