Topband: Antenna analysers in close proximity to BC station.

[Terry Conboy]

On 2012-11-03 8:25 PM, WO0W wrote:
> Perhaps you can take a portable transmitter and manual tuner to the 
> site. At the point where you wish to place an L network, attach the 
> manual tuner and transmitter and adjust the tuner for a good match.  
> Take the tuner away from the source of interference, put a 50 Ohm 
> dummy load on the tuner input, and measure the impedance on the tuner 
> output with the MFJ-259B.  I believe that should be close to the value 
> of the impedance of the antenna that was measured, with little or no 
> affect from the strong broadcast signal.
>
> In event the application you are using doesn't report the voltages on 
> the L network components, the application, Transmission Lines for 
> Windows, found on the CD with the late versions of the Antenna Book 
> will present values for the L components and the voltage applied to 
> each with a given input power.
>
> 73 de WOØW
This is a great idea.  But don't forget that the output Z of the 
terminated tuner will look like the conjugate of the antenna impedance.  
In other words, the sign of the reactance (if any) will be reversed.

73, Terry N6RY