TR-916-SC-P Linx Technologies Inc, TR-916-SC-P Datasheet - Page 15

• Manufacturer Part Number: TR-916-SC-P
• Description: TRANSCEIVER RF 916MHZ 1/2-DUPLEX
• Manufacturer: Linx Technologies Inc
• Series: SCr

Specifications of TR-916-SC-P

• Frequency: 916MHz
• Data Rate - Maximum: 33.6kbps
• Modulation Or Protocol: FM, FSK
• Applications: ISM, Garage Door Opener, Remote Controls, 2-way RKE
• Power - Output: -10dBm
• Sensitivity: -94dBm
• Voltage - Supply: 2.7 V ~ 13 V
• Current - Receiving: 15mA
• Current - Transmitting: 19mA
• Data Interface: PCB, Through Hole
• Antenna Connector: RP-SMA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Other names: TR-900-SC; TR-900-SC; TR-916-SC; TR-916-SC

COMMON ANTENNA STYLES
Whip Style
Helical Style
Loop Style
1/4-wave wire lengths
for SC frequencies:
433MHz = 6.5"
868MHz = 3.24"
902-928MHz = 3.06"
There are literally hundreds of antenna styles that can be successfully employed with the
SC 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.
L =
A whip-style monopole antenna provides outstanding overall
performance and stability. A low-cost whip can be easily fabricated from
wire or rod, but most product designers opt for the improved
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-wave antenna can be easily found using the formula below. 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 average range
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.
A loop- or trace-style antenna is normally printed directly on a product's
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 externally resonated with discrete
components. Despite its cost advantages, PCB antenna styles are
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,
requiring the use of expensive equipment including a network analyzer.
An improperly designed loop will have a high SWR at the desired
frequency which can introduce substantial instability in the RF stages.
Linx offers a low-cost planar antenna called the “SPLATCH” which is an
excellent alternative to the sometimes problematic PCB trace style. This
tiny antenna mounts directly to a product's PCB and requires no testing
or tuning. Its design is stable even in compact applications and it
provides excellent performance in light of its compact size.
F
234
MHz
Where:
L=length in feet of quarter-wavelength
F=operating frequency in megahertz
.255 x 12" = 3.06"
Example:
916MHz
234
= .255