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"Phil Kane" wrote in message .net... | On Fri, 11 Jul 2003 14:19:29 GMT, Dick Carroll wrote: | | There's no AM tower in Santa Clara (or at least none in the last 40 | years that I know of), let alone one that meets that description. | | OOP! that Should have been Santa Cruz. Ya know, the place with the | big boardwalk and all the thong bikinis....... | | This one is right above the water level on a slough of some sort, I | didn't get that good a look but observed it as we drove past. Sure | looked like an local AM tower of the sort I've worked around. | | Ah yes - KSCO, whose long-time owner/engineer, the late Vern Berlin. | was colloquially known as "The Radio Sheriff of Santa Cruz". Anyone | do anything that wasn't kosher - bang, here comes the phone call | from Vern. IIRC he was an olde-tymer ham as well. | | He's been gone for many years now. | | But yes, the multi-tower array is in a salt marsh (protected | wetland) and the radials dribble off into the water. The use of a | 120-radial counterpoise ground of proper length gives some stability | to the antenna impedance and to the vertical pattern which is | important in MF work because of night-time sky-wave factors. | | -- | 73 de K2ASP - Phil Kane | | I sure agree with that comment, Phil. What's really interesting is a 4-tower inline array with one of the towers winding up as a negative impedance. Lots of fun to keep that monster in tune. Glad I don't have to do that any more. Same 4 towers are top loaded with the upper most set of guy insulators on each tower shorted out, then no additional insulators put lower down on the guys. Talk about a drifting array when rime ice forms on the wires during the winter. I also measured the peak RF voltage at the base of the two center towers at over 15,000 volts each! This with only 5 KW of RF total input. 73, Sam |
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