[TowerTalk] Fwd: Change in Frequency As Antenna Height
jimlux
jimlux at earthlink.net
Thu Jun 2 19:26:21 EDT 2016
On 6/2/16 9:51 AM, Steve Hunt wrote:
> Here are the resonant frequencies I measured of a 10m half-wave dipole
> on a telescopic push-up mast at various heights above ground in my back
> yard:
>
> 5ft 29.359MHz
> 10ft 30.499MHz
> 15ft 30.889MHz
> 20ft 30.407MHz
> 25ft 30.179MHz
>
A variation of about 700kHz...
That's roughly consistent with what I modeled at 40m (100-150 kHz
variation).. same percentages to one significant figure..
And, a big jump as you got more than 1/5th wavelength away.
More information about the TowerTalk
mailing list