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| EW N 16 October 2007 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 AFS2-458 500mW 500 W RF power amplifier module AFS2 amplifier module is intended to increase the transmitted power of a Radiometrix multi channel TR2M transceiver module. It provides transmit and receive paths, and can be simply 'dropped into' the aerial connection. The AFS2 may be usable with other 100mW output devices, but no guarantees can be offered. Figure 1: AFS2-458 Figure 2: AFS2 block diagram sales@radiometrix.com AFS2 - Short Technical Overview www.radiometrix.com User interface Figure 3: AFS2 pin-out and dimension Pin description Pin RF 1 2 3 User 1 2 3 RF Module 1 2 3 Name RF GND Aerial RF GND Vcc 0V TXE RF GND RF in/out RF GND Function RF Ground RF connection to aerial (50 ) RF Ground Regulated +5v supply, at <250mA Supply Ground Transmit mode enable (active low, 100K pullup to +5v) RF Ground RF connection to radio module RF Ground NOTES: 1. This amplifier expects a 100mW power level to be output from the radio on transmit. 2. The TXE line should be tied to the TR2M TXE input. When this line is asserted (low) the amplifier is turned on (drawing 280-300mA) and the RF switching connects it between the module and the aerial. When it is inactive (high or floating) a low loss path is provided for the rx signals, from aerial to the module. 3. If a low power transmit mode is needed, the receive path is bidirectional, and capable of carrying up to 100mW of power. In this case the radio must be set to transmit, but the AFS2 pin TXE must be left in the inactive (high) state. 4. Following the return of TXE to inactive (high), the AFS2 remains in transmit mode for another 15mS, to allow the output of the radio to ramp down, before changing over to receive mode. 5. This unit requires a regulated +5v rail, during transmit, and during receive. 6. This version cannot be used with in i1200 modem mode, unless a separate means of driving the TXE pin is provided. (see relevant application notes) 7. This is a 500mW output product. Good grounding (mount onto a groundplane and tack solder all can walls to this), good quality aerials, properly mounted, and a low impedence power supply are required if full performance is to be reliably obtained. If feasible, we recommend mounting the module, and the board it is on, inside a metal enclosure, with the RF cable taken to a bulkhead connector. All signal and power feeds should be filtered and/or decoupled. Failure to observe these measures can cause modulation distortion ('recirculation' effects) or instability. Also be aware of the effect that the strong RF fields generated by this device (and it's aerial) can have upon other adjacent circuitry if this is not properly screened, filtered or otherwise protected. Regulators, sensitive analogue circuitry, and microprocessors seem especially interference prone. sales@radiometrix.com AFS2 - Short Technical Overview www.radiometrix.com Condensed specifications Frequency Transmitter Output power TX hold time TX spurii Receive path loss Supply voltage Current 500mW +/- 1dB (250mW by special order) 15mS after TXE goes high <-40dBm <1dB (bi directional) +5V regulated 250mA transmit <2mA receive (TXE high or floating) -20 to +70 C (Storage -30 to +70 C) 33 x 23 x 9 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 3 pin 0.1" pitch molex 3 pin 0.1" pitch molex 3 pin 0.1" pitch molex 458MHz (standard) Any 10MHz wide segment within 420-470MHz band Operating temperature Size Spurious radiations Interface User RF Module RF Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex, HA3 8RP, ENGLAND Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 sales@radiometrix.com, www.radiometrix.com sales@radiometrix.com AFS2 - Short Technical Overview www.radiometrix.com |
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