On Sun, 12 Jun 2005 18:24:48 GMT, "G.T. Tyson"
wrote:

Gates M-4990 frequency monitor. I'm not sure
of its date of manufacture or how long it has been out of service.

It was in production from about 1958 to about 1972. Frequency monitors
have not been required for 25 years or so.

Dale H. Cook, Chief Engineer, Centennial Broadcasting,
Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI
http://members.cox.net/dalehcook/starcity.shtml