FS National NC-303 Crystal Calibrator. This is a 100kHz calibrator that plugs into the calibrator socket of the NC-303. It is housed in a small box with crystal and tube mounted on top. It is not an original National, but does the same thing looks professional built although I don't see a brand name on it. It works great. I just took it out of my NC-303. Pictures available. Price is $45 shipped. Thanks, Charlie Hugg, K5MBX
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