FYI everyone... 73, Don W4WJ _Click here: HP/Symmetricom 58503B GPS Time and Frequency Receiver | eBay_ (http://cgi.ebay.com/HP-Symmetricom-58503B-GPS-Time-and-Frequency-Receiver-/ 250853948879?pt=LH_DefaultDomain_0&hash=item3a680f7dcf)