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Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
PRELIMINARY
SHX1
500mW Multichannel VHF transceiver
Issue A, 22 April 2010
SHX1 is small multi-channel 25kHz
narrow band VHF transceiver with up
to 500mW RF power output.
It is usable for 144MHz band amateur,
151MHz US MURS and European
169MHz band high power applications.
Figure 1: SHX1-154-5-12K5-MURS
Features
Conforms to ETSI EN 300 220-3 and EN 301 489-3
High performance double superhet PLL synthesizer
500mW RF power output
Data rates up to 5 kbps for standard module
Usable range over 5km
Fully screened. Low profile
Feature-rich interface (RSSI, analogue and digital baseband)
Incorporate a 1200baud modem
Re-programmable via RS232 interface
Low power requirements
Applications
Amateur radio
AMR
MURS units
Industrial telemetry and telecommand
High-end security systems
APRS systems
Vehicle data up/download
ROV/machinery controls
Technical Summary
Operating frequency: Any 3MHz segment in 140 - 175MHz
8 parallel or 255 serial channels
Transmit power: 500mW (+27dBm) nominal
Supply range: +5V regulated
Current consumption: 280mA (at 500mW output) transmit, 20mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Size: 67 x 30 x 9mm
Radiometrix Ltd
SHX1 Data Sheet (preliminary)
page 1
Figure 2: SHX1 block diagram
Radiometrix Ltd
SHX1 Data Sheet (preliminary)
page 2
Figure 3: SHX1 footprint (Top) view
Pin Description
Pins
RF
1A
2A
3A
Normal mode
NO PIN
RF in/out
RF Gnd
To the antenna
RF ground
Modem mode
4A
5A
6A
User
1
2
GND
GND
Vcc (TX)
0V
0V
7
+5V regulated supply for TX
TXD
TXE
3
4
5
6
7
8
9
10
11
GND
Vcc
P3
P2
P1
PGM in
RSSI
RXD
AF out
DC coupled input for TTL / CMOS logic
Transmit enable.
Low = TX mode
0V
8
DC supply input (+5V regulated)
Parallel channel select
Parallel channel select
Parallel channel select
Serial programming/control input (inverted logic level RS232)
DC level between 0.5V and 2.5V. 60dB dynamic range
Open collector output of data slicer. 47K pullup to 4V
500mV p-p audio. DC coupled, approx 0.8V bias
NC
NC
BUSY
MOD TXD
MOD RXD
PGM in
NC
NC
NOTES:
1. No inversion occurs between TXD and RXD. However, AF out is inverted relative to TXD.
2. PGM, P0 - P3 (parallel channel selects) and TXE are active LOW and have internal 47K pullups to
4v.
3. Open collector output RXD has a 47K pullup to 4v.
4. The software incorporates a 1200baud dumb modem, compatible with that implemented in other
Radiometrix narrowband units ( i1200 tones and format ). Modem operation is selected by a serial
command.
5. Main serial port (PGM) operates at 2400 baud. (Command set is the same as SMX (USA) version).
The unit is capable of operating in 'basic' parallel channel select only mode, or in serial controlled
'expanded' mode.
6. If analogue transmit modulation is needed, then connect a series 1uF cap + 500K trimmer (a
multiturn is advised) in the 'baseband TXD' circuit. Adjust trimmer for 90% of peak deviation (+/2.7kHz) at mean input level.
7. The high current (280mA max.) transmitter supply (5v regulated) is fed to a separate pin, on the RF
out connector (pin 6A).
The Vcc (pin 4 on the user connector) can tolerate 4.1 - 15v, and draws up to 25mA. Both pins must
be supplied at all times (most users connect them to a common +5v supply)
Radiometrix Ltd
SHX1 Data Sheet (preliminary)
page 3
Serial interface commands
Serial data is sent to the unit on the programming input (PGM).
To successfully program the unit, it must be powered
Once 'modem' mode has been selected, the unit locks into serial command mode (and the parallel port pins
have other functions) until a SETPAR command returns the unit to ordinary parallel operation.
Unlike earlier Radiometrix multichannel units, the SHX1 (like the QPX1 and USA versions of SMX1) has
separate N and R registers for each channel, on transmit and on receive. In other words, the frequency of
each channel is individually programmed in every mode.
Channels 8-255 then consititute a sequential table, starting from channel 7
Functionally, the N value for any 'table' channel is derived by multiplying the STEP value by the (channel
number -7) and adding it to the N value programmed for channel 7 (the chan 7 " R value" is used throughout
the table).
The LOADMX command sets an upper limit for usable channel numbers, beyond which the unit reverts to
channel 0
Unless a complex frequency map has been selected, all the R value registers are likely to be programmed
with the same value
Commands include:
Commands
Function
GOCHAN a
empty command buffer
LDTXN a nnnnn
LDRXN a nnnnn
LDTXR a nnnnn
LDRXR a nnnnn
set value of N for channel a , for transmit
set value of N for channel a , for receive
set value of R for channel a , for transmit
set value of R for channel a , for receive
LOADST ss
LOADMX aaa
SETMOD
set per-channel increment step for table (channels 8 and up)
set highest valid channel (all channels above this point default to ch0)
Enable internal modem. Frequency selected by most recent 'gochan' or 'single'
SETPAR
SETSER
RVALUE rrrrr
FORCE nnnnn
channel selected by 3 bit parallel input 3
channel selected by most recent 'gochan' operation
set R register value used by FORCE command
set value of N for single channel operation. N value NOT stored in EEPROM. It is
necessary to send a FORCE command with a different value of nnnnn when
changing from tx to rx or vice versa.
lock transmitter on, sending 250Hz squarewave
(nothing overrides this command: you must power-off the unit)
process entry
clear all buffers
disable command mode
GOTEST
<cr>
/
#
Volatile channel set up:
A byte with bit 7 set puts the ls nibble into the high 4 bits of a holding register.
A byte with bits 6 and 7 set puts the ls nibble into the low 4 bits of the holding register and the uses this value
as a channel number to program the PLL. This function does not work if set to parallel mode.
At power-up the unit revers back to the last E2prom stored GOCHAN value
a = single digit channel number from 0 to 7
aaa = channel number from 0 to 255
nnnnn = a synthesizer N register value, (up to 65535)
rrrrr = the synthesizer R register value, (up to 16383)
ALL COMMANDS MUST BE IN UPPER CASE.
For transmit: N = channel frequency / (10MHz / R)
For receive: N = (channel frequency - 21.4MHz) / (10MHz / R)
10MHz / R = 25KHz, so R = 400 (usually)
Radiometrix Ltd
SHX1 Data Sheet (preliminary)
page 4
NOTE:
• 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.
• FORCE mode does not apply any receive frequency offset.
• Different values need to be sent when changing from transmit to receive and vice versa.
• FORCE is intended mainly for test/diagnostic operation.
• 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)
Condensed specifications (All details are provisional)
Frequency
Frequency stability
Channel spacing
Number of channels
Supply
Receive
Transmit:
Operating temperature
Spurious radiations
Any 3MHz segment in 140 - 175MHz
(TX and RX frequencies need not be the same)
+/-5ppm (better than ±1.5kHz)
20kHz or 25kHz (12.5kHz by special order)
8 parallel or 255 serial channels
5.0V regulated at 20mA
5.0V regulated at 280mA for 500mW output
ο
ο
-20 to +70 C (Storage -30 to +70 C)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
Interface
User
RF and TX supply
11 pin 0.1" pitch molex
5 pin 0.1" pitch molex
Recommended PCB hole size
Size
1.2mm (min.)
67 x 30 x 9mm
Transmitter
Output power
TX on switching time
Modulation type
TX modulation bandwidth
Deviation
Adjacent channel TX power
TX spurii
Inputs
500mW (+27dBm)
<50 ms
FM, FSK (F1D, F3D)
DC – 3kHz
±3kHz (±1.5kHz for 12.5kHz channel variant) nominal
-37dBm
<-40dBm
Data (CMOS/TTL compatible)
Receiver
Sensitivity
image / spurious
blocking
adjacent channel
Outputs
-118dBm for 12dB SINAD
-65dB
-86dB
-65dB (tested per ETSI EN300 086)
RSSI, Audio, Data
Radiometrix Ltd
SHX1 Data Sheet (preliminary)
page 5
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
www.radiometrix.com
Copyright notice
This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in
whole or in part must give clear acknowledgement to the copyright owner.
Limitation of liability
The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd
reserves the right to make changes or improvements in the design, specification or manufacture of its
subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the
application or use of any product or circuit described herein, nor for any infringements of patents or other
rights of third parties which may result from the use of its products. This data sheet neither states nor implies
warranty of any kind, including fitness for any particular application. These radio devices may be subject to
radio interference and may not function as intended if interference is present. We do NOT recommend their
use for life critical applications.
The Intrastat commodity code for all our modules is: 8542 6000
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the
R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the
essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment.
Further details are available on The Office of Communications (Ofcom) web site:
http://www.ofcom.org.uk/radiocomms/ifi/
Information Requests
Ofcom
Riverside House
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)845 456 3000 or 020 7981 3040
Fax: +44 (0)20 7783 4033
[email protected]
European Radiocommunications Office (ERO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]
www.ero.dk
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