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RX1-162.025-10 Datasheet(PDF) 9 Page - Radiometrix Ltd |
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RX1-162.025-10 Datasheet(HTML) 9 Page - Radiometrix Ltd |
9 / 19 page Radiometrix Ltd., TX1 & RX1 Data Sheet page 9 Data formats and range extension The TX1 data input is normally driven directly by logic levels but will also accept analogue drive (e.g. 2- tone signalling). In this case it is recommended that TXD (pin 7) be DC-biased to 1.2V approx. with the modulation ac-coupled and limited to a maximum of 2Vp-p to minimise distortion over the link. The varactor modulator in the TX1 introduces some 2nd harmonic distortion which may be reduced if necessary by predistortion of the analogue waveform. At the other end of the link the RX1 AF output is used to drive an external decoder directly. Although the modulation bandwidth of the TX1 extends down to DC, as does the AF output of the RX1, it is not advisable to use data containing a DC component. This is because frequency errors and drifts between the transmitter and receiver occur in normal operation, resulting in DC offset errors on the RX1 audio output. The RX1 in standard form incorporates a low pass filter with a 6kHz nominal bandwidth. In conjunction with similar filtering in the TX1 an overall system bandwidth of 5kHz is obtained. This is suitable for transmission of data at raw bit rates up to 10kb/s. A lower rolloff frequency of around 50Hz has been chosen for the internal filter and data slicer in order to keep receiver settling times reasonably fast. This results in a lowest usable data speed of about 1kb/s for the standard module. In applications such as long range fixed links where data speed is not of prime concern, a considerable increase in range can be obtained by using the slowest possible data rate together with filtering to reduce the receiver bandwidth to the minimum necessary. The internal data slicer is not suitable for data having longer than 1.8ms between transitions and in such circumstances the RX1 audio output can be utilised to drive an external filter and data slicer. The RX1 produces an audio output of approximately 400mVp-p at pin 8, but due to the internal filtering this exhibits a rolloff at low frequencies giving a reduced output of some 100mVp-p as DC is approached. This rolloff can be eliminated and a flat response to DC obtained by using an external RC compensation network, as follows: 100k 33k 100nF Input from RX1 pin 8 Output to low pass filter, etc. 100mV p-p, high impedance Fig.9: Audio compensation network The output of the network will be flat from DC to 5kHz+. It will have a standing DC bias of 1V approx. and should not be significantly loaded (input impedance of following stage should ideally be ≥1MΩ). |
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