Topband: Voltage at top of vertical and scaling?

[Jeff Blaine]

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 <pfizenmayer at 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 <jim at 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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