You guys are way above my head :-) I had no idea the resonant freq goes up and down as the antenna travels on its way up. I thought it just went up on a steep curve till about 15 feet then gradually
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 3
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 3
Scale the height by 2 and divide the frequency shift by 2 and it bears comparison with this: http://www.karinya.net/g3txq/temp/dipole_vs_cobweb_tuning.png Steve G3TXQ 20 ft..to 100 ft. But I dont kno
Gee, we've only been building and testing scaled models to help us understand and predict complex systems for 100 years, in fields I'm familiar with as widely varied as antennas and room acoustics. M
Gee, we've only been building and testing scaled models to help us understand and predict complex systems for 100 years, in fields I'm familiar with as widely varied as antennas and room acoustics. M
On 6/2/16 9:11 AM, Jim Thomson wrote: Date: Wed, 1 Jun 2016 16:47:03 -0700 From: Bob K6UJ <k6uj@pacbell.net> To: towertalk@contesting.com Subject: Re: [TowerTalk] Fwd: Change in Frequency As Antenna
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 percentage