[TowerTalk] Antenna loads for bench testing

[Richard (Rick) Karlquist]

On 2/15/2019 2:01 PM, n0tt1 at juno.com wrote:

> 
> The question is, if a builder wants to make "loads" for bench testing
> (to simulate the actual antenna feed point impedances), how is the
> negative
> load resistance simulated?  If there is, say an impedance of -27 + j3.0
> Ohms,
> does the builder just ignore the negative sign of the resistive part of
> the load
> and use a 27 Ohm resistor in series with the required amount of inductive
> 
> reactance or what?
> 
> Thanks,
> Charlie, N0TT

No, you definitely can't ignore the sign of the resistance.

See this construction article about how to realize a negative RF resistance:

http://www.vk6fh.com/vk6fh/lambda_diode.htm

VK6FH shows how to use this to make a "Tunnel Dipper"
without the tunnel diode, but you can repurpose.

Rick N6RK