TR-916-SC-S Linx Technologies Inc, TR-916-SC-S Datasheet - Page 14

• Manufacturer Part Number: TR-916-SC-S
• Description: TRANSCEIVER RF 916MHZ 20PIN SMD
• Manufacturer: Linx Technologies Inc
• Series: SCr

Specifications of TR-916-SC-S

• 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, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: 0°C ~ 70°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: TR916SCS

GUIDELINES FOR OPTIMUM ANTENNA PERFORMANCE
Page 14
1. Proximity to objects such as a user’s hand or body, or metal objects will cause
2. Optimum performance will be obtained from a 1/4- or 1/2-wave straight whip
3. If an internal antenna is to be used, keep it away from other metal components,
4. In many antenna designs, particularly
5. Remove the antenna as far as possible from potential interference sources.
6. In some applications it is advantageous to place the transceiver and its
an antenna to detune. For this reason the antenna shaft and tip should be
positioned as far away from such objects as possible.
mounted at a right angle to the groundplane. In many cases this isn’t desirable
for practical or ergonomic reasons; thus, an alternative antenna style such as
a helical, loop, patch, or base-loaded whip may be utilized.
particularly large items like transformers, batteries, and PCB tracks and
groundplanes. In many cases, the space around the antenna is as important
as the antenna itself.
1/4-wave whips, the groundplane acts
as
essence, a 1/2-wave dipole. For this
reason adequate groundplane area is
essential. The groundplane can be a
metal case or ground-fill areas on a
circuit board. Ideally, the groundplane
to be used as counterpoise should have a surface area
the 1/4-wave radiating element; however, Linx recognizes that this is
impossible for most compact designs, so all Linx antennas are characterized
using a 4.5” X 4.5” groundplane with the antenna centered and oriented at a
90° angle. Such an orientation is often
not
configuration constraints. In these
instances a designer must make the
best use of the area available to create
as much groundplane in proximity to
the base of the antenna as possible. In
instances where the antenna is
remotely located or the antenna is not
in close proximity to a circuit board
plane or grounded metal case, a small metal plate may be fabricated to
maximize antenna performance.
There are many possible sources of internally generated interference.
Switching power supplies, oscillators, even relays can also be significant
sources of potential interference. Remember, the single best weapon against
such problems is attention to placement and layout. Filter the module’s power
supply with a high-frequency bypass capacitor. Place adequate groundplane
under all potential sources of noise. Shield noisy board areas whenever
practical.
antenna away from the main equipment. This avoids interference problems and
allows the antenna to be oriented for optimum RF performance. Always use
50
a
coax such as RG-174 for the remote feed.
practical
counterpoise,
due
to
forming,
size
and
in
figure 12: Groundplane Orientation
figure 13: Remote Groundplane
NUT
OPTIMUM
USEABLE
the overall length of
(MAY BE NEEDED)
GROUNDPLANE
NOT RECOMMENDED
CASE