> > It would appear that a strong sig on 25m > and another on 31m could produce this effect. My 8 circle receiving > array elements are 23.5 ft long and are resonant somewhere around > 10 mHz so would deliver strong signals from both bands. The spur > seems to be caused by overloading in the rx preamps as it was not > on the tx vertical. > > has anyone else noticed this?
Sort of. I have one like that 1830 that's strong local AM BCB on 1500 mixing with CHU on 3330. It's usually not very strong and I didn't identify it until it got really bad and I heard the distinctive "pings" of CHU and then found the AM station on another radio. It would come and go for a while, and I think may have often been there as a weak signal because of slight preamp nonlinearity. But one night it got really strong and started bursting in and out. That's when I discovered that the strong, troublesome mix was happening in the bearings on a cheap rotator I was using under the mast holding my 20m Moxon rectangle. I fixed it by putting a ground strap across the rotator. 73 Dan _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
