Inductive RFID transmit spectrum]

[Andre Kesteloot]

John W Gould wrote:

> Inductive RFIDs that operate at 134.8kHz pose a possible treat in the future
> to the noise floor in the 136kHz amateur band.  A paper is currently being
> considered internationally that would allow an increase in the modulation
> sidebands, falling in the 136kHz band and elsewhere, from the RFID system.
>
> One item of detail omitted from the papers that are being reviewed is a
> precise specification of the transmit spectrum from the RFID "readers" as
> the interrogators are termed.   It is assumed that it is a flat spectrum
> with constant spectral density.
>
> Grateful if anyone can provide me with more detail of the system's
> modulation scheme / transmit spectrum.
>
> 73  John, G3WKL
> RSGB HF Committee
> g3wkl@btinternet.com