The new KCKK/1510 site was built to 50 kw standards including a Harris 3DX50 transmitter. We put in the usual 120 1/4-wave (165 feet) copper radials under each of the 4 towers. Those were covered by an inch of dirt that had been scraped from the site to create a level surface. Then we went in between those and put in another set of 120 radials each about 25 feet long. All 240 radials originate at a solder connection on a 3/4-inch copper pipe that encircles the tower base. This is connected to the antenna tuning unit for that tower by a 6-inch copper strap. The outer ends of the shorter radials are soldered to another 3/4-inch copper pipe that completely encircles each tower (that's a lot of copper pipe!). This simulates a ground screen around the base of each tower. The second set of radials was covered by another 1 to 2 inches of dirt. I believe the figure I heard was that we buried over 92,000 feet of copper wire! We also ran 4-inch copper strap through all of the trenches alongside the PVC conduit for the coax. All of the tuning units, tower bases, ground radials, the phasor, main and backup transmitters, and even the metal transmitter building and the metal tuning houses are all tied together for a common ground.
Patrick Griffith, Westminster CO Broadcast Technician NRC Broadcasting - Denver http://community.webtv.net/N0NNK/ http://community.webtv.net/AM-DXer/ _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com