RXM-433-RM Linx Technologies Inc, RXM-433-RM Datasheet - Page 13

• Manufacturer Part Number: RXM-433-RM
• Description: RECEIVER RF 433MHZ
• Manufacturer: Linx Technologies Inc
• Series: RMr

Specifications of RXM-433-RM

• Frequency: 433MHz
• Sensitivity: -100dBm
• Data Rate - Maximum: 10 kbps
• Modulation Or Protocol: ASK, OOK
• Applications: ISM, Garage Door Openers, RKE
• Current - Receiving: 14mA
• Data Interface: PCB, Through Hole
• Antenna Connector: Through Hole
• Voltage - Supply: 3.9 V ~ 9 V
• Operating Temperature: -10°C ~ 50°C
• Package / Case: 7-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -

COMMON ANTENNA STYLES
Whip Style
1/4-wave wire lengths
for RMfrequencies:
418MHz = 6.7"
433MHz = 6.5"
Loop Style
Helical Style
There are literally hundreds of antennas styles that can be successfully employed with the
RM Series. Following is a brief discussion of the three styles most commonly utilized in
compact RF designs. Additional antenna information can be found in Linx application notes
#00500, #00100, #00126 and #00140.
A whip-style monopole antenna provides outstanding ove ra l l
performance and stability. A low-cost whip can be easily fabricated from
wire or rod, but most product designers opt for the improve d
performance and cosmetic appeal of a professionally made model. To
meet this need, Linx offers a wide variety of straight and reduced-height
whip-style antennas in permanent and connectorized mounting styles.
The wavelength of the operational frequency determines an antenna's
overall length. Since a full wavelength is often quite long, a partial 1/4-
wave antenna is normally employed. Its size and natural radiation
resistance make it well matched to Linx modules. The proper length for
a 1/4-w ave antenna can be easily found using the formula belo w. It is
also possible to reduce the overall height of the antenna by using a
helical winding. This decreases the antenna's bandwidth but is an
excellent way to minimize the antenna's physical size for compact
applications.
A helical antenna is precisely formed from wire or rod.A helical antenna
is a good choice for low-cost products requiring ave rage ra n g e
performance and internal concealment. A helical can detune badly in
proximity to other objects and its bandwidth is quite narrow so care must
be exercised in layout and placement.
PCB. This makes it the most cost-effective of antenna styles. There are
a variety of shapes and layout styles which can be utilized.The element
can be made self-resonant or ex t e rnally resonated with discrete
generally inefficient and useful only for short-range applications. Loop-
style antennas are also very sensitive to changes in layout or substrate
dielectric which can introduce consistency issues into the production
process. In addition, printed styles initially are difficult to engineer,
An improperly designed loop will have a high SWR at the desired
Linx offers a low-cost planar antenna called the “SPLATCH”which is an
or tuning. Its design is stable even in compact applications and it
A loop- or trace-style antenna is normally printed directly on a product's
components. Despite its cost advantages, PCB antenna styles are
requiring the use of expensive equipment including a network analyzer.
frequency which can introduce substantial instability in the RF stages.
excellent alternative to the sometimes problematic PCB trace style. This
tiny antenna mounts directly to a product's PCB and requires no testing
provides excellent performance in light of its compact size.
Where:
L=length in feet of quarter-wave length
F=operating frequency in megahertz
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