This is pretty common. One thing that can help is to wrap your USB cable through an ft241 31 to rid. About 6 turns gets rig of lots of picked up garbage. 73 Tom
Sent from my Samsung Galaxy smartphone. -------- Original message --------From: Fred Jensen <[email protected]> Date: 2018-11-26 6:14 PM (GMT-05:00) To: [email protected] Subject: Re: [Elecraft] Phantom signals I have a clean carrier at 7039.6, about S4, but nothing on 20. It's pretty hard to build a double conversion superhet that doesn't have a few weak spurs. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 11/26/2018 2:20 PM, N4ZR wrote: > I recently started using N1MM+'s spectrum display with my K3, and it > made me notice that I have some phantom signals on the display. > Specifically, there are steady carriers at 14039.6 and 28039.6. Each > of these carriers has "sidebands" spaced 1 KHZ apart on either side. > There is a slight AC roughness to the tones as heard in CW mode, > particularly on 20M. On 7039.6 and 21039.6 a single carrier is > audible, much weaker than on 20 or 10 meters. > > Disconnecting the antenna from the K3 does not affect these signals, > nor does disconnecting my Airspy HF+ from the IF Out jack. > > Any idea what these might be? Because they are discrete frequencies > and relatively weak, they aren't particularly an operational problem, but > > 73, Pete N4ZR > Check out the Reverse Beacon Network > at <http://reversebeacon.net>, now > spotting RTTY activity worldwide. > For spots, please use your favorite > "retail" DX cluster. ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
