ISM 433 MHz ASK Transmitter – Preliminary Data Sheet

AS3902

Rev. A7, December 2000

Page 13 of 14

Figure 10:

Spurious emissions of the AS3902 measured close to the ETSI EN 300 220-1 recom-

mendation for wide-band equipment, clause 8.7, without modulation, transmitting a con-

stant “H“. (Only difference: 100 kHz RBW was used instead of 120 kHz). The highest

spurious emissions are generated at a carrier distance of 3.39 MHz (

µC clock frequency).

The EN 300 220-1 specifies an absolute level of -36 dBm E.I.R.P. for spurious emissions.

This limits the maximum E.I.R.P. for a transmitter using the AS3902 to about -11 dBm.

Measurement was performed over a free-space link using R&S HL040 antenna for re-

ception.

Figure 11:

Demodulated RF wave for 10101… data pattern at 32kbit/s (linear scale)