The 20-90 is a simple to configure POCSAG paging transceiver with a high sensitivity receiver combined with a 100mW transmitter. It operates over the frequency range of 142-175MHz (VHF variant) or 440 479MHz (UHF variant) decoding and encoding 512, 1200或2400波特, alphanumeric or numeric messages.
The 20-90 supports multiple message queueing and will queue up to four 73-character messages or more smaller messages.