[TowerTalk] Peak Voltage at the Tip of Antennas

[Lux, Jim]

On 10/20/22 1:50 PM, Lux, Jim wrote:
> On 10/20/22 12:08 PM, Pete Smith N4ZR wrote:
>> Not blaming Ed, but is this for real?  I wonder what all the 75 and 
>> 160M phone guys think of this?
>>
>> 73, Pete N4ZR
>> Check out the new Reverse Beacon Network
>> web server at<https://reversebeacon.net>.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>
>> On 10/20/2022 1:43 PM, Edward McCann wrote:
>>> “In the low-frequency band, bandwidth is quite scarce for any 
>>> top-loaded
>>> antenna type and must be carefully evaluated in order to obtain
>>> good-quality speech transmission. In this band, this kind of antenna is
>>> practically the only choice, due to the antenna’s size. In the low 
>>> end of
>>> the medium-frequency band, it is quite difficult to obtain a 
>>> high-fidelity
>>> bandwidth.”
>
> Physically short antennas for MW (implied by top load) could be quite 
> narrow band.  "high fidelity" would be 10kHz BW.  that's 1% at 1 MHz 
> and 2% at 500 kHz.
>
> If he's talking real LF (e.g. 100 or 300kHz, getting 10kHz BW with a 
> toploaded system would be challenging).


For comparison, a run of the mill dipole with thin wires is about 5% 
bandwidth. At 300 meter wavelength (1 MHz) any sort of tower is 
essentially a "thin wire".

A full size antenna at 100 kHz (lambda = 3km) is a monster.