I have learned slowly(but I have learned!) that you can
expect most Collins gear bought on EBAY, and even thru EHAM, and QTH to either
not work, or be in need of help. Not being an elec. tech., I have had to
rely on the services of several individuals, listed on the Collins site.
This has not been inexpensive, running on average $500 per unit, so I now
mentally add that to the price of what ever I am thinking of buying. The
51S-1 that I bought from the Lawyer in upstate