[TowerTalk] Field Strength comparison

[Richard (Rick) Karlquist]

I did a simulation with EZNEC.  Took less than 15 minutes.
10 wavelengths and beyond was far field.  At 5 wavelengths,
the signal strength was 15% higher than far field.  At 2.5
wavelengths it was 100% higher.

This was for a 4 square transmitting array and a movable
receiving vertical.

73
Rick N6RK



On 9/5/2021 3:29 PM, Gary wrote:
> Maybe an EZNEC grandmaster could do it in 10 minutes, but for the beginner nothing can be done with any NEC program in 10 minutes.
> 
> 73,
> Joe kk0sd
> 
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Richard (Rick) Karlquist
> Sent: Sunday, September 5, 2021 2:36 PM
> To: TowerTalk at contesting.com
> Subject: Re: [TowerTalk] Field Strength comparison
> 
> Instead of using rules of thumb from ancient history, you can get a far more precise answer by simply modeling the antennas under test and the test source on EZNEC.  Should take 10 minutes or less.  If you can't go far enough to get into the far field, you will at least know the correction factor at the distance you can do.  The modeling results also provide a sanity check on your actual measurement.
> 
> 73
> Rick N6RK
>