Jim, My K3's receiver also works and sounds great on AM. I have probably spent more time listening to AM broadcast with it than anything else thus far. I use my old Yaesu SP-8 external speaker and it sounds very good to me - and I have tried cranking it up pretty loud, and I hear no distortion at all - certainly none of the "clicking". I have tried all AGC options also - no difference. I have the 6 kHz filter.
Given the comments I saw here before I got my K3, and knowing that casual AM bcst listening is something I do pretty regularly, I was a bit worried about the K3's performance on AM. 73, Bob W5OV -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Garland Sent: Sunday, February 01, 2009 9:08 AM To: elecraft@mailman.qth.net Subject: [Elecraft] K3 AM reception I've been reading a thread on another email reflector about the K3's audio response on AM. One of the reflector participants is a serious SWBC listener and is very dissatisfied with his K3's AM audio. He has pointed out a few things about the K3 AM response which puzzle me. Here they are: "My K3 sounds the same as others I've heard which I consider to be absolutely terrible when using an external speaker and beyond absolutely terrible when using the internal speaker! The 6KHz roofing filter in the K3 will provide an audio bandwidth of up to 3KHz and the FM 13KHz roofing filter will enable the DSP to provide the user with an audio bandwidth of approximately 4.5KHz I've been told by Elecraft." He also says that "Re the bandwidth, a short time ago Elecraft made a mod to the firmware so that audio bandwidth and not IF bandwidth was displayed on the K3's screen. If you're seeing 5KHz and you don't have FM filter installed then it sounds like yet another bug." His particular complaint is audio clicks on AM when hard consonants (Ts, Ks, etc) are spoken, a problem that he says has been confirmed by other users. He has installed all the audio mods in his radio, but they didn't fix the problem. This was all news to me. I've not used my K3 extensively on AM, and maybe my ears aren't as sensitive as his, but I've not noticed any problem. I have the 6 kHz roofing filter in my radio, and the DSP BW goes up to 5 kHz, which he says is a bug, and that the actual BW is only 3kHz. So my questions are: (1) Is audio distortion on AM a known problem with the K3? (2) What does the LCD BW actually read? Is it an IF BW, an audio BW, or what, and does the displayed BW actually corresond to reality? Tnx, Jim W8ZR ______________________________________________________________ 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
