Re: LF: Loop vs Marconi

["Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be>]

Hello Steve and Jay,

I simulated a 15m high / 30m long loop at 1m above ground (Er=5, S=0.1mS/m) 
using MMAMA.
Results were :

> The loop is actually fairly omnidirectional - just not at 0 degrees
> elevation. As you move up from 0 degrees elevation the pattern starts to
> "fill in" nicely in the direction of the "nulls".
The nulls are minimal at an elevation of about 30 degrees (but still -15..20dB)

> Not sure, but I think you can prove this with a small receive loop while
> nulling out a local broadcast station. Tilt the loop even slightly off
> vertical and away goes your null in a hurry.
Tilting the loop didn't change the radiation pattern (vertical 
polarization), but it just probably reduces the radiation resistance
The above assumes not "electrical pick-up". Maybe the nulls in a RX loop 
get smaller when tilting the loop because the magnetic component decreases 
while the electric component almost remains.