ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet

AS3901

Rev. 6, August 2000

Page 15 of 18

5

Typical Measurement s

Figure 6:

Narrow band output spectrum of the AS3901 FSK modulated with pseudo

random data at 32 kbit/s.

Figure 7:

Modulation bandwidth of the AS3901 in FSK operation at 32.6 kbit/s, measured

close to the EN 300-220-1 recommendation for wide-band equipment, clause 8.6.

Instead of 5 kHz video bandwidth (VBW) 10 kHz was used. The markers were set

up to the band edges. (433.050 MHz, 434.790 MHz) The recommendation says

that the spectrum should be observed at least 1MHz form the ISM band edges, but

it was measured with larger frequency span.