I am downsizing my receiver collection and have a very clean Racal RA6790/GM for sale. It has the computer control board and rear panel connector. Filters read out is as follows: 1.6 kHz 2.5 kHz 5.2 kHz 8.3 kHz 20 kHz Pictures are available. Please contact off list for details. Fred W6WAW fwbray at mminternet.com