This little gadget from Radio Shack will act as an attenuator. I use it on my IC-7000. You can adjust it for no hiss then crank up the AF gain for normal listening. http://www.radioshack.com/product/index.jsp?productId=2102975 I use Bose Tripod headphones on the K3 and there is no audio hiss whatsoever. I think what some of you refer to as hiss is either atmospheric noise or noise generated ahead of the audio stage. If I turn down the RF gain, there is no noise at all. The IC-7000 has a bit of audio hiss. Turning down the RFG or even the AF gain has no effect. This is where the RS device comes in handy. The worst hisser I ever had was an FT-1000MP but that was generated in the IF stage. Yaesu still has hissy radios.
Steve Ellington [email protected] ----- Original Message ----- From: "Eric Scace K3NA" <[email protected]> To: "Billy Cox" <[email protected]>; "Elecraft mailing list" <[email protected]> Sent: Monday, April 06, 2009 1:00 PM Subject: Re: [Elecraft] Fw: Re: My K3's hissy and noisy audio > No. It's 3 resistors in a T or pi attenuator circuit. There are many > attenuator calculators on the web (just Google) to help select the > appropriate resistors for your headphone impedance and desired amount of > attenuation. One attenuator is needed for each ear. > > on 2009-04-05 22:14 Billy Cox said the following: >> Eric, is this a simple resistor or ? >> >> BTW, TU for the NCJ articles on TX/RX. >> >> 73 de Billy, AA4NU >> >> -----Forwarded Message----- >> >>> From: Eric Scace K3NA <[email protected]> >>> Sent: Apr 5, 2009 9:21 PM >>> To: Maarten van Rossum <[email protected]> >>> Cc: Elecraft Group <[email protected]> >>> Subject: Re: [Elecraft] My K3's hissy and noisy audio >>> >>> I have very sensitive in-ear monitors. The K3 (and the Orion, and >>> possibly other radios) has significant hiss. I inserted an attenuator >>> and knocked the hiss down below my ability to detect it. There is >>> plenty of audio range remaining. >>> >>> You may find 10 to 20 dB will help. >>> >> > ______________________________________________________________ > 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
