Thanks all for your help on this. It sounds like my 15Kv relay at 53ft on the 68ft vertical is safe. It's never hot switched and provides connection to a 160 "tail" to give me my inverted L there. Best I can do on my limited size, no tree property.
73 jim ab3cv On Tue, Apr 16, 2019 at 7:52 PM HP <[email protected]> wrote: > Just for grins - did a EZNEC free space - perfect ground - with 80 m > vertical of #12 wire resonant at 3.55 mhz > then put another #12 quarter wave resonant wire at right angles to the top > thru 1 megohm -1500 watts in to the vert > (says its 36.42 + j 0 at source ) says there is 3042 volts at angle -92.56 > deg across the 1 meg resistor . > > If go to 10 megs it says 3051 at -93.6 deg and base goes to 36.23 +J 0.02 > > at 10K its says 1245 v at -29.7 deg and base goes to 41.62 + J 8.2 > > FWIW and grins -- > > Hank K7HP > > ----- On Apr 16, 2019, at 6:38 AM, Jim Miller <[email protected]> wrote: > > Is there any data on what the voltage might be at the top of a full size > 80m vertical at 1500w input? > > Is there some zener like ionization at the top that limits the voltage? > > If so is there a way to estimate the voltage at lower points along the > vertical? I assume the scaling wouldn't be linear since starting at the > bottom on 36 ohms (sorta) and going to "infinity" at the top would preclude > that. > > Thanks > > jim ab3cv > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
