It's an artifact of the architecture of the radio - the "Zero-hz crossover".
You can move it by changing the menu item "RX SHFT" from "Nor" to "8.0". This is a per-band setting. Be aware that changing "RX SHFT" prevents using the Dual-Watch receiver, and takes the Roofing Filter out of play (if installed). Another method to move the artifact when working CW is to use CW Rev. This will shift the artifact to the other side of your VFO A cursor. 73, Chris K4HC Date: Sun, 15 Feb 2015 19:23:16 -0500 (EST) From: "[email protected]" <[email protected]> To: "David Orman" <[email protected]> Cc: Elecraft Reflector <[email protected]> Subject: Re: [Elecraft] PX3 - odd 'missing' signal Message-ID: <[email protected]> Content-Type: text/plain;charset=iso-8859-1 I have noticed this null as well. In SSB mode, the null is right at the carrier frequency. In CW mode, the null is offset from the carrier frequency by the amount of the sidetone pitch. Engaging ALT switches the null to the other side of the carrier, again by the amount of the sidetone pitch. I don't recall seeing this on earlier versions of the firmware (though that doesn't mean it wasn't there) Firmware versions here are: PX3 Firmware version: 01.16 KX3: uC: 02.30 dsP: 01.32 73, Dale WA8SRA > I've noticed on various modes/combinations of spans, I show some what look > like null regions. Sometimes it's right where I'm tuned, sometimes it's > offset. In this picture, I am tuned to 14.055.050, in CW mode, span is 2, > and there is a deep null area centered somewhere around 14.056.05. > > In some modes, this is troublesome, especially when it's right on the > cursor where I am tuned. I must be doing something wrong, so would > appreciate any feedback you can give me regarding this / how to fix it. > > Here's an image showing what I am talking about: > http://ormandj.corenode.com/images/radio/elecraft/px3-null.jpg > > Thank you > David ______________________________________________________________ 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]
