Radiometrix Ltd

SHX1 Data Sheet (preliminary)

page 5

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In 'FORCE' mode the unit is inoperative after a power down until either another valid FORCE

command is received, or until mode is changed by a GOCHAN, SETPAR or SETSER command.

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FORCE mode does not apply any receive frequency offset.

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Different values need to be sent when changing from transmit to receive and vice versa.

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FORCE is intended mainly for test/diagnostic operation.

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A pause of at least 50ms must be allowed between command strings (EEPROM programming time)

Modem mode

The 'modem' mentioned is a 1200baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is

present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore

noise and only output valid serial data) This is a half duplex unit, so collisions between transmitted and

received packets must be dealt with by the user

If greater modem functionality is needed, then a version (SHZ1) is available which includes a full-function

M48A modem device inside the unit, replacing the i1200 functions (case height is increased by 3mm to

accommodate the extra circuitry). This "SHZ1" only operates in 'modem' mode (no parallel channel select, no

independent transceiver operation)

Ordering Information

Part No.

Application

Channel

spacing

Frequency band

(MHz)

SHX1-144-5

Amateur Radio (e.g. APRS)

25kHz

144.000 - 146.000

SHX1-151-5-12k5-MURS

Multi-Use Radio Service

(MURS) in USA, Canada

12.5kHz

CH0:151.820 –

CH4:154.600MHz

SHX1-169-5-12K5

Meter Reading, Asset Tracking

and Tracing

12.5kHz

CH0:169.40625 –

CH15:169.59375

CH16:169.61875-

CH31:169.806250

SHX1-169-5

25kHz

CH0:169.412500-

CH7:169.587500

CH8:169.62500-

CH15:169.8000