[RFI] RFI Question

Ray LaRue w4byg at att.net
Fri Feb 12 11:33:57 EST 2021

I think you are right, it's not as simple as that.

The output impedance of the generating device would seem to be 
significant. In many cases it would not be easy to ascertain that output 
impedance, one could only guess.

ALso, I assume you are referring to a "piece" of wire to be connected at 
one end to the RFI source and the other wire end to be free.

If the output impedance of the RFI device is low. It would make the wire 
more of a quarter wave long radiator. For example a 32' wire would be 
resonate then around 40 meters.

If the RFI device had a high impedance, the same 32' piece of wire would 
likely be resonant in the 20 meter band.
Ray, W4BYG

On 2/12/2021 07:02, Tony wrote:
> All:
> The question below came up in a recent conversation:
> If a device that generates RFI at a consistent level across the HF 
> spectrum were connected to a wire that was 1/2 wavelength at a given 
> HF frequency, would the level of RFI be noticeably stronger at that 
> frequency?
> The consensus was that it *should* be because the device is generating 
> RF like any other RF transmitter and the wire being 1/2 wave would act 
> as a dipole at the resonant frequency.
> Sounds plausible, but I have a feeling it's not as simple as that.
> Tony
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