Scanned and posted the VR-4b video module (plugin) manual. 95MB PDF.
minimum of 2.5 minutes to download.
http://www.bunkerofdoom.com/lit/singer/singer_vr4b.pdfThese Alfred / Singer / Panoramic units show up from time to time for very cheap and make fine bandscopes or just great specan for the low end. Unfortunately the unit is little-known and the manual is unobtanium so I fixed that. An ingenious person can make the plugin work standalone by supplying the proper DC voltages.
Singer Alfred spectrum analyzer MF-5 with VR-4b video module covering 300KHz to 27.5MHz. The frequency range is considered narrow by today's standards, but these make excellent panoramic adapters for classic high-end communications receivers. A fun use is to monitor foreign shortwave signals to see if a bit of NFSK shows up hidden on the carrier.
