Hello Joe, Thanks for the reply. So if I understand you correctly, this noise is coming from the synthesizer and is normal?
>From conversations with Elecraft tech support, I got the impression that this should not be occurring as they could not replicate the noise on their K3's. It also does not happen when listening to the sub receiver using the AUX BNC connector. It only manifests itself when listening to the main or sub receivers and using ANT1 or ANT2. I have noticed that if I come across a broadcast signal within that specific frequency range, then the signal will mask out the EMI completely, and I can't hear it until I tune past the station. It would be helpful if I could get a definite answer from the Elecraft engineers. So far, I have not heard anything from them. This noise is actually quite loud for me, and spikes at S7 on the Elecraft meter. 73, James KC2UEE -----Original Message----- From: Joe Subich, W4TV [mailto:[email protected]] Sent: Saturday, February 28, 2009 6:06 PM To: 'James Sarte'; [email protected] Subject: RE: [Elecraft] Weird EMI issue... part deux > I've noticed that when I'm tuning around 4.8 MHz to 5.3 MHz, > I can hear EMI in the form of a motorboat sound whenever I > turn a front panel knob. It's most apparent when spinning > VFO A or VFO B knobs, but also occurs when turning the filter > knobs. I have a slight bit of noise when tuning only in that area. I believe it to be entirely normal. I recall Wayne saying somewhere that the DDS operated in the area of 5 MHz and that was synthesizer switching noise. In my case, the noise is about S1 on an S-meter that was calibrated to the XG-2 and is in "abs" mode. In my case the noise is only audible in the main Rx with VFOA or XIT/RIT when XIT/RIT is enabled ... or in the sub RX with VFOB or XIT/RIT when XIT/RIT is enabled. The noise is masked by band noise with an antenna connected. It is audible only from 4.900 to 5.100 and only noticeable from 4.940 - 5.050 unless one it looking for it. As you say, it is not present when the VFO or RIT knobs are at reset ... it is not a problem here. 73, ... Joe, W4TV ______________________________________________________________ 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
