Siretta

Adhesive Antennas

Alpha Range

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Key Features:
  • Adhesive mounting
  • 2G/GSM/GPRS, 3G/UMTS, GPS
  • ISM, WiFi, Bluetooth, Zigbee
  • Combined antennas
  • Compact/ Low profile
  • Quick installation

View our Antenna Selector to quickly find the right antenna for your application.

The Alpha range of antennas are flat as a pancake and are supplied with a strong adhesive base that enables secure mounting without the need to drill any holes. Furthermore, the Alpha antennas are tuned to a variety of short range and long range technologies and come in different shapes as well as sizes, making the Alpha range suitable for different types of applications.

Alpha 18, the latest penta band addition to the Alpha family, is a small and compact antenna covering quad band GPRS and 3G. The Alpha family of antennas come in a variety of shapes and sizes such as T-bar, blade, puck shaped and more. Alpha 14 is the smallest Alpha antenna (length), operating at Quad Band GPRS and 3G frequencies as well as 868, 915MHz (ISM). As mentioned before, the Alpha range of antennas are one of the most compact antennas with the Alpha 8 being the most compact Alpha antenna (3mm).

Each Alpha antenna is tuned to either a single frequency or a set of frequencies. Infact, some of the Alpha antennas cover up to 6 frequencies like the Alpha 1A. This is ideal for applications using multiple wireless technologies for communication. Furthermore, the Alpha range of antennas are designed for seamless connectivity in harsh environments such as the IP67 rated  Alpha 4A GPS antenna or the IP66 rated Global GPRS and 3G antenna the Alpha 8.

The high performance, IP rated, compact, small and elegantly designed, low cost Alpha antennas are suited to a wide variety of applications such as SCADA, remote monitoring governance, intelligence gathering, remote monitoring, asset tracking and many more.

Not sure which Alpha antenna best suits your application requirements? Call us on +44(0)1189 769014 for assistance.

 

 

SirettaPULSE M2M Blog

Read the latest about Siretta products, news and M2M applications
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Extend your reach with Siretta quality, low-loss RF cables

Acquiring RF signals in poor reception areas (2G/3G/4G), short range wireless communication (line of sight for 433 and 868 MHz) or WifI connection in large buildings will require high gain antennas placed as high as possible to get the best reception. Problem is that the longer the cable length is from the RF equipment to the antenna, the higher the losses and consequently poorer reception. RG174 and RG58 are standard cables that everyone use for RF work, however the losses per metre escalate rapidly the higher the frequency goes. Antennas with cable lengths of 10M, 15M or 20M will suffer considerable loss over the length. It means that a more powerful transmitter and /or a more sensitive receiver is required. This all comes at a price in one way or another. Better to not have the losses there in the first place. Standard RG58 cable has an approximate loss per metre of 1dB at 2.5GHz - Wifi and Euro 4G frequencies. Bear in mind that a loss of 3dB of signal is actually halving the signal strength it is easy to see why systems are not very sensitive if they have long and standard cables to the antenna. Now take the LLC200 low loss RG58 equivalent it has a solid copper core and 2 levels of shielding and special connectors to accommodate the cable. It has a 0.55dB loss per metre at the same 2.5GHz frequency. Bearing in mind the logarithmic nature of measuring in decibels the signal arriving at the end 20M of RG58 cable at 2.5GHz is about 0.07% of what went it to the cable. Alternatively, using the LLC200 cable the signal arriving at the end of the cable is around 12% of what went in. 0.07% versus 12% is a massive difference in signal strength. This is the case for Siretta\'s low loss cable range! Siretta’s low loss extension cables provide the best solution in minimising losses and giving the required RF signal for a successful and continuous wireless connection. Generally speaking low loss cables are not very available as a stock item, however at Siretta we have a complete range of cable lengths and connector styles from stock or very short lead time. Available in cable lengths from 5m to 20m with a vast number of connector combinations, including, SMA, FME, N-Type and TNC etc. Look for the white cable marker telling that it is a Siretta quality cable, its part no. and length.....



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5 ways to improve 2G and 3G signal strength for M2M devices

Systems are only as reliable as their weakest link and when it comes to M2M wireless -the weakest link is poor, intermittent signal strength. Low signal levels result in poor system performance, slow response times and reliability issues. For system installers and other M2M vendors, how do you ensure the very best 2G or 3G signal strength?

1. Checking the 2G/3G signal strength
Typically most M2M cellular systems will simply not work, or the performance is substantially degraded by low signal strength. This may result in data not being transmitted, irregular polling success or complete lack of connection. Some wireless devices (routers / modems) have a signal strength indication facility but these only report on the connection available to them.

An independent check of signal strength can be performed using a 2G / 3G signal strength analyser such as the Siretta SNYPER. These testers are hand held, network independent, and analyse the signal strength for all available networks. SNYPER can be connected to the deployed antenna to check the actual signal strength of the installed system.

2. Which network SIM to use?
Depending on location you may find one cellular network has a better signal strength than the other networks. The SNYPER product checks this for you without the need to buy a SIM from each network. Once the network has been decided the next step is to optimise the antenna and RF cables routing back to the M2M device.

3. Re-positioning the antenna
Fitting the antenna in the best possible location has a significant effect on the signal levels received by your M2M equipment. This may mean moving the antenna further away from the M2M device (router, GSM modem) and/or positioning it higher up by mounting to a wall or pole. Directional antennas (e.g. Yagi) can also help improve the signal if you know the direction of the receiving station. For most applications, this information will not be easily available and due to reflections from walls, buildings and other surfaces, more often the signal is not received from the expected direction making omni-directional antennas more appropriate.

4. Go “High-Gain”
Some antennas are far better than others at specific frequencies, ensuring the right antenna is selected for an application is key. Antennas with higher gain will perform far better than low cost alternatives.

5. Reducing signal losses
Running a length of RF cable between antenna and router/GSM modem introduces further degradation of signal strength. Replacing a standard RG58 style RF cable with a low loss equivalent can solve signal strength issues and potentially mean that the antenna does not have to be repositioned. Additionally, low loss cables enable longer RF cable lengths to be used if required.

Summary
Whilst RF signal strength can appear somewhat of a ‘black art’, there exists a number of tried and tested approaches to help improve signal strength for antennas. For most applications, the starting point will be to determine the best cellular network and be able to accurately measure the 2G / 3G signal strength using a signal tester such as the SNYPER 3G.



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