As a follow-up to the e-mails that were sent to the reflector and those that I received privately, I wanted to let the group know that last night I resolved the problem I was having where audio would be lost in LSB, USB and AM when the K3's bandwidth was set to 2.8 kHz while running FW 3.30.
As I mentioned yesterday, on Friday I received the DSP upgrade, so before installing it I re-loaded the K3 with FW 3.76. After doing so, the problem remained but now the audio would cut off at a BW of 3.0 kHz, returning at 3.1 kHz in all three modes. The full range of bandwidths available in the CW and DATA modes were unaffected. I replaced the DSP board and the problem remained (as expected). However, when I performed an EE Init, I found that everything began working properly. As soon as I re-loaded my latest configuration file, the problem returned. Unfortunately, my next-newest configuration file was dated August 09 and turned out to be incompatible with 3.76, so I manually re-configured the radio from scratch. All is well now. Thanks to all those who responded. Scott N7NB -----Original Message----- From: K6LE [mailto:[email protected]] Sent: Sunday, February 07, 2010 8:18 AM To: WW2PT Cc: Scott Prather; Elecraft Reflector Subject: Re: [Elecraft] K3 Loses RX Audio at BW of 2.8 kHz Bingo! I restored my last config (from 1/20) and problem is gone.. Now I am trying to noodle over what configuration item may have changed during the beta upgrade that caused it. At any rate, all is good now! Rick K6LE On 2/6/2010, at 11:07 , WW2PT wrote: > My K3 was working fine last time I used it. Tonight I turned it on and > noticed a similar problem -- no audio in USB or LSB modes whenever I > set the width to 3.00 kHz or less. Tried downgrading from 3.76 to 3.63 > but no change. Checked all filter settings in the config menu, nothing > out of place. All other modes were fine. > > On a hunch, I restored my last configuration backup file. It worked! > Everything seems to be behaving well again. > > 73 de WW2PT > > > > > On Feb 6, 2010, at 12:45 AM, Scott Prather wrote: > >> All: This evening when running FW 3.76 I'm seeing a problem with my >> K3 that >> I've never seen before. >> >> When the K3 is in the LSB, USB or AM mode, adjusting the bandwidth >> down to >> 2.8 kHz will result in total loss of audio, even though the S-meter >> continues to read incoming signal strength. I've tried an EE-Init and >> reloaded the configuration, but the problem remains. Thinking this >> might be >> related to 3.76, I went back to 3.30 and I have exactly the same >> problem. If >> I turn on the sub receiver and change its BW using BSET, it loses >> LSB, USB >> and AM audio at 2.8 kHz as well. To get audio to return, all I need >> to do is >> change the BW to 2.9 kHz or greater on either the main or the sub. >> >> Looking through the reflector postings, it looks like someone saw >> something >> similar to this in the DATA mode a few months back, and pressing the >> A/B key >> would clear it. However, in my case the only way I can restore audio >> is to >> change the BW to 2.9 kHz or greater. In the CW and DATA modes, the >> audio >> does not drop out at any bandwidth setting. >> >> Does anyone have a suggestion as to what might be going on? ______________________________________________________________ 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
