On Thursday, May 7, 2020, 10:20:32 AM EDT, Reginald Beardsley via groups.io <pulaskite@...> wrote:

FYI

The guy I bought the 577 from had a pile of extender cards about 16" long with 3 coax cables.    He had been planning to scrap them for the gold.  I urged him not to and said I'd find out what they were for.