Siretta

Direct Connect Antennas

Delta Range

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Key Features:
  • Direct Connect
  • Global GSM/GPRS and 3G
  • ISM, WiFi, ISM, Bluetooth, Zigbee
  • Wirefree

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

The Delta family of antennas connect directly to your equipment without drilling any holes and making any arrangements for mounting. Each antenna is tuned to either a single frequency or multiple frequencies covering long range and short range communications. 

The Delta antennas are designed in different shapes and sizes to suit a diverse set of applications. The monopole antennas are either straight (Delta 1A), right angled (Delta 2A) or hinged  (Delta 6A). The hybrid, hinged form allows the antenna to be positioned straight or at the most appropriate angle. 

Standing just 8mm short, the Siretta Delta 8A is the smallest WiFi antenna. Delta 6A is the highest gain Delta antenna covering Global GPRS, 3G and ISM 868 as well as 915 MHz and boasting a peak gain of 6.8 dBi.

The Delta range of antennas are ideal for portable and handheld devices. However, these antennas are used in different applications such as SCADA, Agricultural applications, predictive maintenance and more due to the small size, ease of installation, lightness, robustness and performance.

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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The Toughest Antennas in Town

Demanding situations need products that won’t let you down, products that will take whatever life throws at them. For wirelessly connected industrial applications, such as vehicle tracking, the antenna often needs to be even more rugged than the equipment it is connected to. Whilst the end equipment can often be protected or even hidden from view, the antenna represents a significant failure point which needs to be well positioned, often at odds with the need to secure the antenna. Enter the Tango family of compact antennas from wireless specialist Siretta, each and everyone with secure through-hole mounting and seriously tough exteriors. Easily mounted to panels and casings, the Tango antennas are ideal where an unobtrusive solution is required, and options for environmental protection and vandal resistance ensure it will take care of itself. Siretta’s Tango range offers a variety of options to fit purpose for many of today’s RF applications that require a more rugged solution, including; automotive, meter reading, tracking, transport network, outdoor M2M and others within relatively demanding environments. The Tangos are one of Siretta’s most extensive antenna ranges as we aim to provide you with as much choice as possible. Within the Tango range, there are host of different styles and designs to choose from: puck types, shark-fins, low profiles, high gain whips as well as a variety of IP rated and vandal proof antennas. The Tango 14 and 15 antennas offer the low profile options which serve both anti-vandal and covert applications, whilst the Tango 11A & 17 antennas are the ‘rock-hard’, IP67 rated, destruction proof antennas with solid PVC housing, large screw thread studs and ‘round-the-edge’ gaskets. The Tango 19, 20 and 21 are the extremely compact antennas with their small footprint size. Tango products support all the main frequency bands, including; quad band GSM/GPRS, 3G, WiFi, GPS and GLONASS and also comprise the space saving two and three way combination products, with GSM/GPS and GSM/GPS/WiFi in a single package. Find out more about the Tango range



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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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