RXM-433-RM Linx Technologies Inc, RXM-433-RM Datasheet - Page 12

• 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: -

ANTENNA CONSIDERATIONS
Page 12
Antenna Selection Chart
PARAMETER
Ultimate performance
Ease of design setup
Size
Immunity to proximity effects
The range of the RF link is widely variable and depends upon the type of antenna employed
and the operating environment.Proper design and matching of an antenna is a complex task
r e q u i ring sophisticated test equipment and a strong back ground in principles of RF
propagation. While adequate antenna performance can often be obtained by trial and error
methods, you may also want to consider utilizing a premade antenna from Linx.Our low-cost
antenna line is designed to ensure maximum performance and Part 15 compliance.
It is usually best to utilize a basic quarter-wave whip for your initial concept evaluation.This can
easily be made from a piece of wire as shown on the next page. Once the prototype product is
operating satisfactorily, a production antenna should be selected to meet the cost, size and
cosmetic requirements of the product. It is important to recognize that the antenna plays a
significant role in determining the performance and legality of your end product.In order to gain
a better understanding of the considerations involved in the design and selection of antennas,
please review Linx applications note #00500 “Antennas:Design, Application, Performance”.
The following notes should help in achieving optimum antenna performance:
1.
antenna to detune. For this reason the antenna shaft and tip should be positioned as far
away from such objects as possible .
2.
at a right angle to the ground-plane. 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.
3.
described under "Board Layout Considerations".This allows your product's output power
to be adjusted for certification purposes without change or compromise to the antenna.
4.
particularly large items like transformers, batteries, and PCB tracks and ground-planes. In
many cases, the space around the antenna is as important as the antenna itself.
5.
counterpoise, forming, in essence, a 1/2-wave dipole. For this reason adequate ground-
plane area is essential. As a general rule the ground-plane to be used as counterpoise
should have a surface area
6.
Switching power supplies, oscillators, even relays can also be significant sources of
potential interference. 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 ground-plane under all potential sources of noise. Shield noisy
board areas whenever practical.
7.
from the main equipment.This avoids interference problems and allows the antenna to be
oriented for optimum RF performance. Always use 50
remote feed.
Proximity to objects such as a user’s hand or body, or metal objects will cause an
Optimum performance will be obtained from a 1/4- or 1/2-wave straight whip mounted
On the transmitter end it is always a good practice to include a T-attenuation pad as
If an internal antenna is to be used, keep it away from other metal components,
In many antenna designs, particularly 1/4-wave whips, the ground-plane acts as a
Remove the antenna as far as possible from potential internal interference sources.
In some applications it is advantageous to place the transmitter and its antenna away
=FAIR
the overall length of the 1/4-wave radiating element.
=GOOD
LOOP
=EXCELLENT
coax such as RG-174 for the
HELICAL
WHIP