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RX1-151.300-10 Datasheet(PDF) 5 Page - Radiometrix Ltd |
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RX1-151.300-10 Datasheet(HTML) 5 Page - Radiometrix Ltd |
5 / 11 page Radiometrix Ltd., TX1H high power transmitter data sheet Page 5 Applications information Power supply requirements The TX1H has a built-in regulator which delivers a constant 3.5V to the transmitter circuitry when the external supply voltage is 3.5V or greater. This ensures constant performance up to the maximum permitted rail, and removes the need for external supply decoupling except in cases where the supply rail is extremely poor (ripple/noise content >0.1Vp-p). TX modulation requirements The module is factory-set to produce the specified FM deviation with a TXD input to pin 14 of 3V amplitude, i.e. 0V “low”, 3V “high If the data input level is greater than 3V, a resistor must be added in series with the TXD input to limit the modulating input voltage to a maximum of 3V on pin 7. TXD input resistance is 100k Ω to ground, giving typical required resistor values as follows: Vcc Series resistor ≤3V 3.3V 5V 9V - 10 k Ω 68k Ω 220k Ω Expected range Predicting the range obtainable in any given situation is notoriously difficult since there are many factors involved. The main ones to consider are as follows: • Type and location of antennas in use • Type of terrain and degree of obstruction of the link path • Sources of interference affecting the receiver • “Dead” spots caused by signal reflections from nearby conductive objects • Data rate and degree of filtering employed The following are typical examples – but range tests should always be performed before assuming that a particular range can be achieved in a given situation: Data rate Tx antenna Rx antenna Environment Range 1.2kbps half-wave half-wave rural/open 10-15km 10kbps half-wave half-wave rural/open 3-4km 10kbps helical half-wave urban/obstructed 500m-1km 10kbps helical helical in-building 100-200m Note: The figure for 1.2kbps assumes that the receiver bandwidth has been suitably reduced by utilising an outboard sallen-key active audio filter and data slicer or similar arrangement. The TX1H’s TXD 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 14) 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 BiM1 introduces some 2nd harmonic distortion which may be reduced if necessary by predistortion of the analogue waveform. Although the modulation bandwidth of the TX1H extends down to DC 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 receiver’s audio output. |
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