I used a W1W relay at the top of mine for years without incident.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 4/16/19 7:22 PM, Jim Miller wrote:
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 <pfizenma...@q.com> 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 <j...@jtmiller.com> 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
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