I'd bet coffee and donuts it's 455KC Upper Sideband, 2.3 KC bandwidth. > > TYPE D.F-455-U-2.3-H ( may be DF or D.F. ) > > P/N 7232-528-3 > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20200216/2b8ca427/attachment.html>