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Update readme for 2.4GHz

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plugins/channeltx/mod802.15.4/readme.md
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<h3>4: PHY</h3> <h3>4: PHY</h3>
This specifies the parameters of the PHY (physical layer), including the bit rate and modulation that is used for the frame transmission. Supported PHYs are 20kbps BPSK, 40kbps BPSK, 100kpbs <1GHZ O-QPSK, 250kpbs <1GHz O-QPSK and 250kbps 2.4GHz O-QPSK. This specifies the parameters of the PHY (physical layer), including the bit rate and modulation that is used for the frame transmission. Supported PHYs are 20kbps BPSK, 40kbps BPSK, 100kpbs <1GHZ O-QPSK, 250kpbs <1GHz O-QPSK and 250kbps 2.4GHz O-QPSK.
These 802.15.4 PHYs use DSSS (Direct sequence spread spectrum), whereby multiple chips are transmitted per symbol. This means that a high sample rate (>3MSa/s) and large RF bandwidth is required. The baseband sample rate should be set to an integer multiple of the chip rate. These 802.15.4 PHYs use DSSS (Direct sequence spread spectrum), whereby multiple chips are transmitted per symbol. This means that a high baseband sample rate and large RF bandwidth is required. The baseband sample rate should be set to an integer multiple of the chip rate (at least 4x).
Each PHY is applicable only for specific frequency bands as detailed below: Each PHY is applicable only for specific frequency bands as detailed below:
Channel Page | Channels | Frequencies (MHz) | Bit rate (kbps) | Chip rate (kcps) | Modulation | Shaping | Min sample rate (MSa/s) Channel Page | Channels | Frequencies (MHz) | Bit rate (kbps) | Chip rate (kcps) | Modulation | Shaping | Min sample rate (MSa/s)
-------------|----------|--------------------|-----------------|------------------|------------|---------|--------------- -------------|----------|--------------------|-----------------|------------------|------------|---------|------------------------
0 | 0 | 868.3 | 20 | 300 | BPSK | RC r=1 | 1.2 0 | 0 | 868.3 | 20 | 300 | BPSK | RC r=1 | 1.2
0 | 1-10 | 906, 908... 926 | 40 | 600 | BPSK | RC r=1 | 2.4 0 | 1-10 | 906, 908... 926 | 40 | 600 | BPSK | RC r=1 | 2.4
0 | 11-26 | 2405, 2410... 2480 | 250 | 2000 | O-QPSK | Sine | 0 | 11-26 | 2405, 2410... 2480 | 250 | 2000 | O-QPSK | Sine | 8
2 | 0 | 868.3 | 100 | 400 | O-QPSK | Sine/RC | 4 2 | 0 | 868.3 | 100 | 400 | O-QPSK | Sine/RC | 2.4
2 | 1-10 | 906, 908... 926 | 250 | 1000 | O-QPSK | Sine | 6 2 | 1-10 | 906, 908... 926 | 250 | 1000 | O-QPSK | Sine | 4
5 | 0-3 | 780, 782.. 786 | 250 | 1000 | O-QPSK | RC r=.8 | 6 5 | 0-3 | 780, 782.. 786 | 250 | 1000 | O-QPSK | RC r=.8 | 4
11 | 0-6 | 2363, 2368... 2393 | 250 | 2000 | O-QPSK | Sine | 11 | 0-6 | 2363, 2368... 2393 | 250 | 2000 | O-QPSK | Sine | 8
11 | 7-13 | 2367, 2372... 2397 | 250 | 2000 | O-QPSK | Sine | 11 | 7-13 | 2367, 2372... 2397 | 250 | 2000 | O-QPSK | Sine | 8
11 | 14 | 2395 | 250 | 2000 | O-QPSK | Sine | 11 | 14 | 2395 | 250 | 2000 | O-QPSK | Sine | 8
<h3>5: RF Bandwidth</h3> <h3>5: RF Bandwidth</h3>
This specifies the bandwidth of a LPF that is applied to the output signal to limit the RF bandwidth. This specifies the bandwidth of a LPF that is applied to the output signal to limit the RF bandwidth.
PHY | Occupied BW (99%) | Mesaured Occupied BW PHY | Occupied BW (99%)
----------------------------|----------------------------------------- ----------------------------|-------------------
20kbps BPSK | 400kHz | 440kHz 20kbps BPSK | 400kHz
40kbps BPSK | 760kHz | 940kHz 40kbps BPSK | 760kHz
100kbps O-QPSK | 330kHz | 500kHz 100kbps O-QPSK | 330kHz
250kbps <1GHz O-QPSK (Sine) | 1.200MHz | 1.8MHz 250kbps <1GHz O-QPSK (Sine) | 1.2MHz
250kbps <1GHz O-QPSK (RC) | 1.200MHz | 1.4MHz 250kbps <1GHz O-QPSK (RC) | 1.2MHz
250kbps >2GHz O-QPSK | | 3.2MHz 250kbps >2GHz O-QPSK | 2.6MHz
<h3>6: Gain</h3> <h3>6: Gain</h3>