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3.1.5. Transmit to receive turnaround time
The time from transition of the TXE control line (transmit enable control line from WMAC to DSP) from active
state to inactive state until the NIC is in receive mode shall be not more than 10µs.
3.1.6. RF center frequency
The RF function provides programming of the RF center frequency from 2400MHz to
2500MHz in steps of 1MHz. The RF center frequency for transmission and reception shall be stable within
25kHz of its final value, 0.75ms after reprogramming or switching from doze mode to receive mode.
3.1.7. RF center frequency and clock accuracy
The master clock frequency and the RF center frequency shall be within +/-25ppm of the nominal value.
The carrier jitter is within 25kHz of its final value 40µs after switching between RX and TX mode.
3.2. Transmitter
3.2.1. Transmit power-on and power-down ramp
The transmit power-on ramp from 10% to 90% of the maximum power shall not take longer than 2µs. The
transmit power-down ramp from 90% to 10% of the maximum power shall not take longer than 2µs. The
transmit power ramp shall be constructed such that the emissions comply with the radio regulations.
3.2.2. Transmitted power level
The nominal transmitted power shall be 15 dBm +/- 2dB at full operational temperature range. This range
complies with the IEEE802.11 PHY standard and the radio regulations. The power density shall not exceed
10dBm/MHz EIRP.
3.2.3. Transmitted output spectrum
The transmitted spectral products shall be less than -30dBr (dB relative to the sin(x)/x peak) for frequencies
between 11MHz and 22MHz from the center frequency and -50dBr for frequencies more than 22MHz from the
center frequency. The measurement shall be made at the antenna port using 100kHz resolution bandwidth.
3.2.4. RF carrier suppression
The RF carrier suppression measured at the channel center frequency shall be at least 15dB below the peak
sin(x)/x power spectrum.
3.3. Receiver
3.3.1. Medium busy
The DSP reports to the WMAC the presence of a spread-spectrum signal on the medium by the MBUSY signal.
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