An attenuator in the phones lead might be what you need. Some are available from various audio outlets (I have an old Radio Shack - rip - one here). Turn up the attenuation until there's no background audible and you are all set.
If you are handy with a soldering iron, a resistor in series with each side of your phones will do the trick. 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of bozidar Sent: Tuesday, September 29, 2015 9:53 AM To: [email protected] Subject: [Elecraft] K3 - background hiss (noisy K3) - update Hi, i have studied all the posts about this topic. Seems, that is still, huge confusion about that, so i will try to formulate a problem on simply way: *With low impedance earphones plugged into the audio jack on the K3, you can hear a really annoying noise (hiss) even with the AF and RF volume set to zero(CCW). This audio hiss has a constant level, is added to the audible RF noise and can prevent one from hearing weak signals on an otherwise quiet band.* That hiss has nothing to do with K3 receiver or settings - simply is permanent present. This indicate that something must be wrong with earphones amplifier LM4811MM, and that is odd, because LM4811MM seems to be an high quality chip, designed exactly to work with low impedance earphones , with a minimal amount of external components? My question is: is, in the mean time, known any hardware (or anything else) modification for that issue? best regards, Bozidar -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-background-hiss-noisy-K3-update-tp76 08490.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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
