Trying to work the 10-meter contest that just ended from my high-noise QTH, I found a very narrow heterodyne on my Orion II, just one sideband from 28,027,618 to 28,027,627 Hz. (With my step set normally at 10 Hz, it was audible only at 28,027,620 Hz.) Anyone know its source? -- John, K3GHH