[Elecraft] K3 - background hiss (noisy K3) - update

[Ron D'Eau Claire]

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: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of bozidar
Sent: Tuesday, September 29, 2015 9:53 AM
To: elecraft at mailman.qth.net
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:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to ron at cobi.biz