RTcom Radio Modems Especificações descarregar pdf (Página 22)

ABACOM TECHNOLOGIES • 67 Hamptonbrook Dr • Etobicoke • ON • M9P 1A2 • Canada • Tel: +416-242-3120 • Fax: +416-242-2697

The power supply section takes 7-12 V unregulated dc. The code generator produces 16 MHz direct sequence

spread spectrum signals, via a modulator in the RF section. The RF section generates frequencies directly in

the 2.4 to 2.4835 GHz range to avoid spurious mixing products which are potentially troublesome with up-

conversion techniques. This reduces the cost as no conversion stages or filters are required.

A diversity RF switch selects one of two antennas under user control and a Tx/Rx RF switch connects the se-

lected antenna to either the transmitter or the receiver automatically (i.e. under processor control). The data

recovery section removes the spreading code and converts the analogue receiver output to digital levels.

The fast hardware synchronization circuits provide initial synchronisation in less than 2 mS and subsequent

tracking is maintained for the duration of the received data packet. The data packet format, error correction

coding and network protocols are under the control of the user's equipment for maximum flexibility in applica-

tion.

SMA coaxial jacks are fitted for external antennas as required by users. The data input/output, power supply

lines and receiver inputs have built-in EMC protection for ESD immunity.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 33 34

Sem comentários

RTcom Radio Modems Especificações Página 22