Welcome to Shireen Inc

Shireen, Inc. designs, develops and manufactures components and systems for the Broadband Wireless, SCADA, Military and Telecommunications industries. Our solutions include everything from “mission critical” components for military communication systems to increasing the power of WiFi installations.

What We Offer
Our products are constantly improved to take advantage of the latest technology available. We specialize in custom designs and solutions for all segments of the wireless industry. At Shireen, we make wireless work!
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Finding the Right Cellular Repeater in a 4G World

Posted by Perception System Thursday, September 29, 2011 0 comments

Those who live in areas with limited cellular coverage are all too familiar with the tell-tale signs of poor cell phone reception: dropped calls, poor voice quality, weak signals and poor battery life. In recent years, as cell phone usage skyrocketed, those in rural areas found themselves limited to just a few carriers with spotty coverage in their area. Then, along came 3G cell boosters. Cell phone signal boosters for the 850MHz and 1900MHz bands have proliferated the market, offering improved voice quality, fewer dropped calls, faster data speeds and better battery life. However, in recent months, talk of 4G and "4G speeds" has crept into the consumer market. How do Cellular Repeaters fit into this new 4G market?

There is no doubt that in the very near future there will be a need for 4G cell phone signal boosters. Currently, major players are fighting for dominance in the 4G arena: Verizon, AT&T and MetroPCS utilize LTE (700 MHz), partners Sprint and Clearwire utilize WiMAX (2.5GHz) and T-Mobile uses HSPA+ (1700MHz). Verizon recently embarked on a three-year project to roll out LTE nationwide. By 2013, Verizon hopes to make LTE available to roughly 285 million Americans. According to projections from the WiMAX Forum, WiMAX coverage is expected to touch the one billion mark globally by the end of 2011. T-Mobile's 4G service is already available in over 135 U.S. cities.

With 4G coverage looming across the United States, it is important to clearly understand the role of 4G in your personal cell phone usage. Currently, 4G services are being utilized for data services rather than voice. Therefore if you are not a smartphone user or are just looking to improve voice quality on your cell phone, you probably won't need a 4G Cellular Repeater any time soon. Furthermore, in order to take advantage of 4G at all, you'll need a 4G phone. Currently, the selection of 4G cell phones is limited to just a few per carrier. Finally, you will have to check with your preferred carrier to confirm 4G coverage in your area.

Currently there is only one 4G cell booster on the market: the Wilson AWS Cell Phone Signal Booster. Slated for official release in Q2 of 2011, this amplifier boosts signal on T-Mobile's 1700MHz band. With a 60 dB gain, the Wilson 4G AWS Cell Booster is being introduced to the market at $399.95.

Individuals in rural areas who are already experiencing spotty 3G coverage are unlikely to experience 4G service in the next couple of years. However, as 4G coverage continues to expand, the demand for LTE and WiMAX cellular repeaters will no doubt increase and consumers will soon begin to see 4G cell boosters entering the market. Until then, learn more about boosting your cell phone signal with the latest 3G cellular repeaters. The author resource box below provides further information on dual band cellular repeaters.


 
 
Source: Ezine

What is a Voltage Controlled Oscillator (VCO)?

Posted by Perception System Tuesday, September 27, 2011 0 comments

Voltage controlled oscillators are commonly abbreviated as VCO. The VCO's are electrical circuits that yield an oscillatory output voltage. A VCO is an oscillator whose output frequency is proportional to the applied input voltage. The parts of a VCO circuit has a LC tank circuit with an inductor(L) and a capacitor(C) along with one or two transistors accompanied by a buffer amplifier. A VCO gives a periodic output signal where the output signal parameter is directly related to level of input control voltage. The center frequency of a VCO is the frequency of the periodic output signal formed by the VCO when the input control voltage is set to a nominal level. The voltage-controlled oscillator has a characteristic gain, which often is expressed as a ratio of the VCO output frequency to the VCO input voltage.

VCO's often utilize a variable control voltage input to produce a frequency output. The control voltage input typically may be tuned so that the VCO produces a desired, operational frequency output. The input control voltage is then adjusted up or down to control the frequency of the periodic output signal. A voltage controlled oscillator is capable of changing an oscillating frequency in response to a change in control voltages. A VCO typically employs one or more variable capacitors commonly called as varactors to allow for adjustment of the frequency of oscillation for the VCO. The tuning range of the VCO refers to the range of oscillation frequencies attained by varying the varactors.

Two important parameters in VCO design are sweep range and linearity. Linearity correlates the change in frequency or the VCO output to the change in the control voltage. The sweep range is the range of possible frequencies produced by VCO control voltage. Various types of VCO's have been discovered so far. VCO's comprised of bipolar junction transistors have been used to generate output ranging from 5 to 10MHz.

Voltage controlled oscillators are basic building blocks of many electronic systems especially phase-locked loops(PLL) and may be found in computer disk drives, wireless electronic equipment such as cellular telephones, and other systems in which oscillation frequency is controlled by an applied tuning voltage. The voltage oscillator components are almost an inevitable part of all digital communication equipments. VCO's are used for producing local oscillator signals (LO) which are in turn received by the transmitter and the receiver systems for the frequency up conversion and the down conversion respectively. Wireless subscriber communication units such as the GSM use voltage oscillator circuits for generating radio frequency signals. The VCO's are also employed in many synthesizer and tuner circuits and one best example for that is Television. A high frequency VCO is used in applications like processor clock distribution and generation, system synchronization and frequency synthesis.



Source : Ezine

10Watt 2.4 GHz to 1.8GHz Simple Frequency to Voltage Converter Circuit

Posted by Perception System Monday, September 26, 2011 0 comments

10Watt 2.4 GHz to 1.8GHz

Frequency Converters UDC 2418-10
This UDC converts any 2.4GHz radio to 1.8GHz unit for use in military applications. With 10 Watt output, the range can be extended by several folds. Ideal for applications where space is limited and higher power output is required.

Buy 10Watt 2.4 GHz to 1.8GHz Here!

Download Specifications
Product Spec #UDC2418-10

Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com
————————————————————————————-
FCC notice: The marketing, sale and use of power amplifiers are governed by and subject to FCC rules & regulations under Part 15.247. Shireen’s ISM band amplifiers are available for export, military, OEM & licensed customers only. It is the responsibility of the purchaser/installer/operator to insure that only approved equipment/systems are deployed. Shireen provides full engineering support to OEMs interested in certified systems.

Cable Television As a Main Telecommunications Transport Medium

Posted by Perception System Thursday, September 22, 2011 0 comments

There are many choices for broadband service providers and the technologies they offer. Cable Television Systems throughout the world use multiple network architectures to deploy their services. One of the most prevalent ones is referred to as HFC (Hybrid Fiber Coax) this is known as a closed system network. That is to say, the signals are not transmitted through the air. They are sealed within a combination of fiber optic and coaxial cables. The technology has been around since the early 1980s. It has undergone major technological advances through innovative design and engineering since its inception. The transport of cable television signals in an HFC system is via a combination of fiber optic (light transmission) and coaxial cables (RF transmission) beginning at a processing station known as the Head-end. A Head-end is much like the Central Office for the telephone company. It is the heartbeat and brains of the network. In Cable Television the Head-end gathers incoming signals of voice, video and data from satellite, microwave and off-air sources. It then processes and combines all of the information, turns it into light and transmits it via laser transmitters onto a fiber optic network. The fiber optic portion of the network is extremely reliable and the transfer of information is at light speed. Before the network can service a business or home, the fiber cable must terminate at what is called an optical receiver. An optical receiver receives the light transmitted by the Head-end through the fiber network and turns it back into RF. It is then transmitted onto coax cables which in turn feed RF amplifiers. These amplifiers raise the signals to a high enough level to allow service to the customer base of homes and businesses.

Advantages--The HFC network is capable of all voice, video and data services. For this reason what are referred to as bundled services, are offered by the Service Provider. These services are competitively priced and affordable. Internet speeds are very fast. Phone service is reliable and the picture quality is good. In the United States, video signals transported by the HFC system are already converted to digital and processed so your television can understand them. For this reason, special boxes are not required for most modern televisions to operate. Typically the requirement of a special set top box is when premium or expanded type services are requested by the consumer.

Disadvantages--The HFC system requires a considerable number of electronic devices to work in harmony in order to operate properly. Any failure or maintenance issues with these devices can cause degradation, or temporary discontinuance of service to small or large areas of the system. Recovery time and severity of the problem is dependent upon the device type and where it is located in the network. Hi volume internet traffic can cause a slowdown with internet speeds on an HFC network. The entire network is constructed on existing utility poles and or underground within Public Utility Easements. Mother Nature can wreak havoc with high winds, lightning and general wear and tear resulting in outages and or physical damage to the cables and electronics. But the same holds true for any outdoor utility such as telephone or power.

 
 
Article Source: Ezine

Insight into RF Amplifier and Things to Consider when Selecting Them

Posted by Perception System Tuesday, September 20, 2011 0 comments

You are often suggested to buy RF amplifier when you are out there planning to buy a radio. Know why? Because amplifiers are simple devices which enhance the sound quality you receive from audio devices. RF (radio frequency) amplifiers are especially designed to go with radios. They receive varied input signals in the form of current, voltage or others and transform them into output signals with larger amplitude based on the input signal.

Though both the input and the output devices use different circuits, signals received and sent by them are generally of the same type. Uninterrupted signal is generated as the power supply created output circuit receives resistance in varying levels from the input circuit to stable the current. Based on the amount of signals received from the input circuit by the output circuit one or more pre-amplifiers may work together to enhance the signal to create powerful output and send it to the RF power amplifier (PA).

Different types of RF amplifiers are pulse, multi-carrier, low noise, buffer, bi-directional and limiting amplifiers. Various types of them make it little difficult to select the right type of RF amplifier, however the choice can be made easier if you focus on their disparate performance specifications like operating frequency, design gain, output power and gain flatness.

  • Different RF amplifiers have different frequency range for which their specifications are guaranteed, this is called operating frequency
  • Design gain refers to the ratio of output to the input and is usually denoted in decibel
  • Conditions like load, temperature, supply voltage and VSWR (Voltage Standing Wave Ratio) affect output. Output power refers to how the output will be affected under any such condition
  • Gain flatness refers to the gain variation depending on the operating wavelengths

Output VSWR, noise figure (NF), monolithic microwave integrated circuit (MMIC) technology and input VSWR are some secondary specifications you should check when you are thinking of buying RF amplifier.

RF Converter – Energy Saving Device Make Your Life Easy

Posted by Perception System Sunday, September 18, 2011 0 comments

Now-a-days, the demand for frequency converter or frequency charger has been increased in many industries. The reason for this it’s fairly obvious, industries around the world need energy-saving devices in a variety of industrial applications and the frequency converters are of great help to solve the problem considerably. In a couple of years, the markets of frequency converters are expected to increase by fourfold its present size.

Frequency converter is one type of electronic device which converts alternating current (AC) from one frequency to other frequency and also its can change the voltage. A frequency converter typically consists of a rectifier stage that is inverted to produce AC of the frequency of your choice. There are many frequency converters available in the market, but RF converter is the most demanding devices in this field.

RF Converter can converters any GHz radio frequency to MHz unit and amplifies power to 10 watt. Thus, allowing users to take advantage of lower band with better penetration. The added high output power (10 Watts) increases the coverage by many folds. It offers a high power solution in a small package and also uses for mobile applications.

So if you are looking for buy RF Converter, then I suggest you SHIREEN NIC. It is a leading company of USA, which provides designs, develops and manufactures components and systems for the Broadband Wireless, SCADA, Military and Telecommunications industries.

5 Watt 2.4 GHz to 1.8 GHz 3 Phase Rotary Frequency Converter

Posted by Perception System Saturday, September 17, 2011 0 comments

5 Watt 2.4 GHz to 1.8 GHz

Frequency Converters UDC 2418-05
This UDC converts any 2.4Ghz radio to a 1.8GHz unit for use in military applications. This 5 watt version, offers a high power solution in a small package. Ideal for mobile applications. The unit requires proper heat sink if used in stand alone configuration.

Also available in 10 Watt and 50 Watt versions.
Buy 5 Watt 2.4 GHz to 1.8 GHz today

Download Specifications
Product Spec #UDC2418-05

Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com
—————————————————————————————
FCC notice: The marketing, sale and use of power amplifiers are governed by and subject to FCC rules & regulations under Part 15.247. Shireen’s ISM band amplifiers are available for export, military, OEM & licensed customers only. It is the responsibility of the purchaser/installer/operator to insure that only approved equipment/systems are deployed. Shireen provides full engineering support to OEMs interested in certified systems.

10 Watt 2.4 GHz to 900 MHz High Frequency Converter Circuit

Posted by Perception System Wednesday, September 14, 2011 0 comments

10 Watt 2.4 GHz to 900 MHz

Frequency Up/Down Converter
This Up-down converter (UDC) converts any 2.4GHz radio to 900MHz unit and amplifies power to 10 watt. Thus allowing users to take advantage of lower band with better penetration. The added high output power (10 Watts) increases the coverage by many folds.

Buy 10 Watt 2.4 GHz to 900 MHz Here!

Download Specifications
Product Spec #UDC2409

Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com
——————————————————————————————-
FCC notice: The marketing, sale and use of power amplifiers are governed by and subject to FCC rules & regulations under Part 15.247. Shireen’s ISM band amplifiers are available for export, military, OEM & licensed customers only. It is the responsibility of the purchaser/installer/operator to insure that only approved equipment/systems are deployed. Shireen provides full engineering support to OEMs interested in certified systems.

How to Choose a Cell Repeater

Posted by Perception System Tuesday, September 13, 2011 0 comments

You're tired of experiencing poor cell phone reception, dropped calls and poor voice quality. You get some reception outside your home or office, but as soon as you step inside it seems to magically disappear. Your phone is constantly scanning for a signal, so your battery dies much faster than it should. You've double checked your phone and called your carrier, all to no avail.
You need a cell phone signal booster.

How Cell Repeaters Work

Cell repeaters, also known as cell amplifiers, cell extenders or cell boosters, are fairly simple to use. Most boosters consist of three major components: an external directional antenna, an internal antenna and a signal amplifier.

The external directional antenna is typically placed outside the home or office (preferably outside a window or on a roof) and is positioned to face the nearest cell tower. In the event that you are installing the antenna yourself, a signal strength monitor is recommended to help you figure out the best location for the antenna. The external directional antenna is designed to pick up the weak signal that is being broadcast by your cellular provider.

The signal the external antenna picks up is sent over wires to the signal amplifier. The signal amplifier is what increases the signal. Your boosted signal is then sent to the internal antenna which wirelessly rebroadcasts a more powerful signal within your space.

How to Differentiate Between Cell Boosters by Frequency

Cell boosters operate on different frequencies: 800 MHz, 1900 MHz and iDEN. The 800MHz frequency is compatible with Verizon phones outside of Florida and Texas, Alltel phones in selected states, and US Cellular phones in selected states. T-mobile, Sprint, Metro PCS and several other carries operate on the 1900MHz band. AT&T operates on both bands.

Often the most comprehensive solution is to opt for a Dual Band Cellular Repeater. These repeaters operate on both the 800 MHz and 1900 MHz bands, ensuring proper coverage with all major carriers (with the exception of Nextel). Nextel users in need of a cellular repeater must invest in an iDEN booster.


Source: Ezine

DC Stop / DC Block

Posted by Perception System 0 comments

DC Stop / DC Block
This DC stop prevents DC voltage from being shorted in power over coax systems, where mast head amplifier is not used.  Typically the mast head amplifiers are fed power over coax via Bias T, feeding power to multiple antennas in 900Mhz and 1.8GHz bands.

This DC stop is needed if power is fed up the tower without using amplifier at any antenna.   The unit provides excellent loss & VSWR characteristics with high isolation between the two ports.

Buy DC Stop – DC Block today
Product Specifications
Product Specs#50701
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

RF Power Amplifier – Enhances Your Signal Strength and Efficiency

Posted by Perception System Sunday, September 11, 2011 0 comments

Amplifier is a device used to increase the dimension of a signal. This is a one kind of relationship between input & output amplifier, which is signified in terms of the input frequency known as transfer function and the volume of output to the input is called in reinforcements, usually measured in decibels.

These conditions are best suited to "electronic amplifier." A unit of the amplifier is signifying as voltage or current. There are various amplifiers available in the market, but RF Power Amplifier is one of the most demanding devices in this field.

Why RF Amplifiers are in High demand?

RF amplifier is a one kind of electronic amplifier, used to modify signal of low-power radio-frequency (RF) into a higher signal of a significantly power, in general driving a transmitter antenna. It is generally used to get high output power compression, good return loss at the entrance and exit, optimal heat dissipation and high efficiency.

So if you are looking for purchase RF Power amplifiers, then I suggest you SHIREEN NIC. It is a leading company of USA, which provides designs, develops and manufactures components and systems for the Broadband Wireless, SCADA, Military and Telecommunications industries.

We also provide Cat5e Shielded, Coax cables, rf converter, high power amplifiers, RF Amplifiers, LMR400, cellular repeater, etc. Our solutions include everything from “mission critical” components for military communication systems to increasing the power of WiFi installations.

Coax Cables - A Look Into Its Various Components and Principles

Posted by Perception System Thursday, September 8, 2011 0 comments


Coax cables are used in radio frequency transmission and in applications where receivers, transmitters and antennas are used. Part of its basic tasks is to strengthen signals of particular types of gadgets. The device works in processes dictated by coaxial technology.


Coax cables come in several designs as well. Knowing about the components of these designs will give you an idea of how it actually looks like. Of course, you must also see through the various components of the design in order to ascertain the industrial product's performance. Apart from looking at product parts, you must also scrutinize the processes behind it.

Standard designs for coaxial cable systems

The design of the coaxial cable is important to the proper functioning of the device. The design dictates the efficient transfer of energy from one device to another. The most usual parts are the signal wire, insulation, shielding and sheath.

Copper is the standard part used in forming signal wires. Strands of copper may be utilized while some opt for a more solid output. This is usually situated at the core layer of the cable and is known to be relevant in the strength of signal transmission.

The insulation is the part that covers the signal wires. This often comes in the form of dielectric wrappers constructed out of polyethylene, Teflon and foam. Protecting the insulation is another part known as the shielding. This part is created out of aluminum or mesh. Some industries utilizing the coaxial cable do not always require the presence of the shielding. Last but not the least is the part otherwise known as the sheath. This is the outermost layer of the coaxial cable. This one is used to secure the cable from physical interference or disturbance.

Coaxial cable connection processes

The proper functioning of the coaxial cable depends upon its designs. If you want an effective transmission gadget, you must look into basic principles in order to make the gadget work. An example of a principle to look forward to deals with the matching of impedance between the cable and the device. Look for the gage rating also to know whether certain cables or parts can be best suited to the coaxial cable or not.

Diameter of the coaxial cables must also be thought of properly. The longer the cable is, the better the power that makes it work. Some manufacturers use hollow designs to reduce the cost connected to the coaxial cable design and to assure that it can be reshaped and bended for better processes.

Miscellaneous Connectors

Posted by Perception System Wednesday, September 7, 2011 0 comments


Miscellaneous Connectors
We offer a variety list of standard and custom connectors:

  • Connector for Proxim AP600
  • Hirose U.FL for 802.11 g and a radios
  • Lucent MC card connector
  • MCX , right angle, LMR100A
  • MCX- Straight- male- LMR100A
  • MMCX connector for RG316/LMR100A
  • MMCX RP for LMR100A
  • AISG 8 Pin Female
  • AISG 8 Pin Male
  • PL259 Male for LMR600
  • PL259 Male for LMR400

Buy Miscellaneous Connectors today
Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

TNC Connectors

Posted by Perception System 0 comments


Shireen, Inc. TNC Connectors
We offer the following standard and custom TNC connectors:

  • TNC female, RG58/LMR195
  • TNC male RG58/LMR195
  • TNC RP female for RG316/LMR100A
  • TNC RP female for LMR400
  • TNC RP female for LMR600
  • TNC RP male for RG316/LMR100A
  • TNC RP male for LMR400
  • TNC RP male for LMR600
  • TNC RP male for RG8X/LMR240
  • TNC RP male, RG58/LMR195
  • TNC male, LMR 400
  • TNC male for RG8X/LMR240
  • TNC female for RG8X/LMR240

Buy TNC Connectors today
Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

Type N Connectors

Posted by Perception System Tuesday, September 6, 2011 0 comments


Shireen, Inc. TNC Connectors
We offer the following standard and custom Type N connectors:

  • Type N Female for RG58/LMR195
  • Type N Female Bulkhead for 1.13 mm cable
  • Type N Female, 4 hole flange, 0.5″
  • Type N Male for RG58/LMR195
  • Type N, Female Bulkhead for RG316/LMR100A
  • Type N Female for LMR400
  • Type N Female for LMR600
  • Type N Female for RG8X/LMR240
  • Type N Male for LMR400
  • Type N Male for LMR600
  • Type N Male for RG316/LMR100A
  • Type N Male for RG8X/LMR240
  • Type N Male Right Angle for LMR400
  • Type N Male Captivated Center Pin for RG8X/LMR240 

Buy Type N Connectors today
Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

SMA Connectors

Posted by Perception System Monday, September 5, 2011 0 comments

SMA Connectors

Shireen, Inc. SMA Connectors
We offer the following standard SMA connectors:
SMA Connectors

SMA female for LMR400
SMA female, RG316/LMR100A
SMA female, RG58/LMR195
SMA male for RG8X/LMR240
SMA male for LMR400
SMA male RP for RG58/LMR195, right angle
SMA Male straight, RG316/LMR100A
SMA male, Straight, RG58/LMR195
SMA RP female for RG316/LMR100A
SMA RP female for LMR400
SMA RP male for LMR400
SMA RP male, RA, RG316/LMR100A

Buy SMA Connectors today
Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

Waterproof RJ45 Connector Assembly Kit

Posted by Perception System Sunday, September 4, 2011 0 comments


Waterproof RJ45 Connector Assembly Kit
RJ45 Waterproof connector assembly for harsh environmental conditions.
Download Specifications
Product Spec #99-502
Product Information
For more information about our products, please contact us directly at 301.838.4380 or email us at sales@shireeninc.com

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