A phase lock oscillator usually abbreviated as PLO is a feedback control circuit. The output signal of this oscillator is phaselocked to a reference signalMostlya crystal oscillator is the reference frequency.

A PLO is comprised of three fundamental blocks-

• Phase Detector
• Loop Filter
• Voltage Control Oscillator

Phase Lock Oscillators are available as:

• PLXO – 10 to 1400 MHz
• PLVCO – 10 MHz to 32 GHz
• PLDRO – 5 to 42 GHz
• PLCRO – 0.5 to 4 GHz

PLO are uses depend upon the specific array of requirement such as-

• Requirements of internal and external reference frequency
• Output frequency
• Power output
• Environmental necessities
• Spectral qualities such as harmonics, phase noise etc

We offer the widest range and best performance Stripline, Microstrip, Lumped element Coaxial and Waveguide circulators in the world, extremely aggressive pricing structure. Our ferrites are the best anywhere

• From mille Watts to Kilo Watts, standard and special custom models, even including cryogenic models.working down to -272.5oC.

• Still the best specifications and the lowest prices in the industry.

• Microstrip Drop-in on carrier(2-100 GHz) 20-W at Low frequencies, to 1 Watt at high Frequencies

• Stripline drop ins 30MHz to 4GHz, including the 800M to 3.6 GHz Cellular, DCS, PCS,UMTS, WI-MAX, RFID bands.

• Coaxial 26MHz to 50 GHz with SMA, N, K, 2.4 connectors. Wide Band: Octave, Octave+ and Peripheral mode Coax Isolators: inc special 3.35-12.8GHz and 2-18GHz Full band units

• Waveguide 2 to 100 GHz in all major frequency bandsPower handling at the lower frequencies up to 3KW CW and 5KW pulse

A circulator is an inert non-reciprocal 3 to 4 port device, where in a radio frequency or microwave signal entering any port is transmission to next port in rotation. They have low insertion loss, high isolation, low VSWR or high return loss, and high power handling. They find their use in amplifiers, frequency sources and receivers.

A low-noise block downconverter, normally called a low-noise block (LNB) is a central component of a satellite dish. The essential function of this convertor is to translate incoming signals from a satellite to a picture to visualize on TV. The LNB is fitted on the end of the arm on a dish antenna and gets its input signal from the feed horn. It delivers the downconverted signs to a decoder that creates images for viewing.

It is important to consider the frequency band used, Lower frequencies such as C band mainly utilized in tropical high rainfall areas. In more moderate climates the additional benefits of Ku band and Ka Band can be utilized.

The specifications of LNBs differ between one modelto the next, so it is likewise worth inspecting the scope of items accessible. The noise figures is the key standard for high specification units and permits even weak signals to be detected and passed through a link to the TV recipient.

The polarization and skew can likewise influence signal quality. It is quite easy to buy LNBs as individual units through various online retailers and dish suppliers. Raditek offers premium models for weak signal areas.

Almost every industry makes use of advanced technology telecom systems to ensure effective communication with people all over the world. One of the most effective and reliable communication sources is Satcom that offers convenient internet access to users across different sectors. It finds its extensive usage in providing effective television delivery, telecommunication purpose, and military applications particularly to remote areas.

Satcom modems are the heart of Satcom communications, Modulating the Signal to the satellite and demodulating the Signal from the msattelite. How efficiently this information is handled has huge consequence on the data flowing through the Satellite and the operating cost.

Military war fighters and commanders share and disseminate information with military forces worldwide through their high speed and high capacity Satcom modems.

Banks use them as private networks to eliminate the extremely high cost of hacking.

Satellite Operators charge users based on their satellite usage, Raditek DAMA / ABOD Modems raise this efficiency from a typical 70-80% to over 90%. Saving users thousands of Dollars per month on their “Space Segment Utilization” bills. Considering this over a 10-15 year life, the savings are huge.

There are many features in our modems that contribute to this saving one of the most important is DAMA.(Demand Assigned Multiple Access). This technology facilitates multiple modems sharing the satellite transponder.

A DAMA modem is a straightforward and simple communication technology that provides easy channel sharing options for users across different networks. Some of its compelling advantages include –

• Multiple participation of network

• Real-time resource allocation

• Easy set up and modeling

• Useful for both low as well as moderate profiles of users

• Enhanced proficiency of resources relating to space segment.

When it comes to broadband connections for government, commercial, military, or infrastructural industry, the major technological advancements that come top include block up converter (BUC). With their distinctive functions and roles to play.

Block up converters (BUC) are used extensively in those military and commercial satellite systems that deploy transponders of C, Ku and Ka-band as they offer high-end performance and can easily support both fixed as well as portable terminals.

The Indoor BUC low power output is typically fed a short distances over coax cables or waveguide to a High Power Satcom Amp mounted on the rear or frame of the Satcom Antenna.

The Outdoor BUC gets its feed directly from a satcom modem (typically indoors). It is combined with an amplifier and after converting L Band signal from the modem amplifies the signal before feeding the Antenna. For very high power Systems they are tube-based (TWTA), most are solid-state amplifiers. They comprise intermediate-frequency amplifier, mixers, with low-phase noise, and DC-power supply.

These Bucs can range in power levels dependent on Frequency. Examples are:

C Band 2 to 700Watts SSPA

X and KU Bands 2 to 1200 Watts

Ka Band 1-15Watts Watts

All these BUC’s are available from Raditek and are capable of providing powerful performance at affordable prices.

A Phase Lock Oscillator is a high accuracy frequency signal source that gets its stability by being phase locked to a harmonic of a precision lower frequency reference.

The lower frequency reference has to be very accurate and very stable, with accuracy measured in ppm (parts per million) and stability measured in short term temperature variations typically over a day and aging over 1 to 10 years.

References range from low to extremely high cost depending on the end requirement. In its simplest form a simple Crystal Oscillator (XO) can about 1000ppm accuracy. However the frequency changes with Temperature giving birth to the TCXO (Temperature Compensated Crystal Oscillator) with accuracies 1-10ppm. A better stability is achieved in an OCXO (Oven Compensated Crystal Oscillator) where the crystal oscillator is mounted inside an oven held in narrow temperatures around 90C giving 0.1-1ppm accuracy. In the quest for even higher stability reference the GPS Signals form satellites are used and expensive Cesium and Rubidium Oscillators are used, Raditek provides all of the above references.

We can offer Phase Locked Oscillators from 1 to 110 GHz by using DRO, shigh performance FET oscillators, amplifiers, and Frequency Multipliers to produce desired power output and frequency.

The PLO needs will determine the use of variety of the apposite basic oscillator. Such fundamental oscillators function over the frequency ranges as given below:

1. PLXO- Crystal Oscillators 10 to 1400 MHz

• Very stable

• The best accessible phase noise

• Sensible cost

2. PLCRO- Coaxial Resonator Oscillators 0.5 to 3 GHz

• Extremely stable

• Best phase note

• Moderate cost

3. PLDRO- Dielectric Resonator Oscillators 7 to 42GHz and with Multipliers to 110 GHz

• Extremely stable

• Best phase note

• Affordable cost

References such as XO, TCXO and OCXO can be mounted inside the High Frequency Oscillator (IR). The more expensive ones are typically External (ER) and the reference shared over many.

DAMA (Demand Assigned Multiple Access) is a communication channel access technology that offers easy and proactive sharing of channel(s) among various users and networks. Technically, there could be thousands of satellite stationsin a given satellite network coverage area. DAMA, channels can be shared with or assigned to different users, as demanded by them.This is how DAMA gets its name — Demand AssignedMultiple(user) Access. (Channels are a pairof transmitter and receiver carrier frequencies.)

Working with DAMA is simple and straightforward. With the help of a set of tools and resources, sharing channels among different users is highly feasible.A number of users get access to channels via a set of resources and tools. In this process, the capacity of the channel does not get reduced, if a dataset assigned to a channel is not used. There are many benefits of using Demand Assigned Multiple Access, some of themare –

• Improved efficiency of space segment resources

• Competent exploitation of terminals or terminal segments

• Multiple network participation

• Real-time allocation of resources

• Aptness of communicating to secured UHF channels, including that of US Military (5 and 25 kHz)

• Suitable for radio or baseband frequencies and timeslots

• Highly useful with sparsely used networks

• Effectual satellite communication in VSAT satellite systems

• Support users with low to moderate usage profile

• Easy modeling and setting up

• Functional in bent pipe environment

• Perfectly matches user demands to available satellite capacity

• Access to a dedicated single channel, along with two other modes operation on a single SATCOM resource

Operating modes of DAMA–

DAMA offers effectiveutilization of various new radio waveforms that formthe SATCOM channels.It is not at all essential for all channels to work on those newly-adopted waveforms. To understand how DAMA system works, we, at first, need to understand what DAMA standards are. DAMA standards operate on three modes, which are explained below –

Dedicated Single Channel – Also referred to as Dedicated-Channel Single Access (DCSA) mode, this mode provides a user with net exclusive rights to communicate on the channel,assigned dedicated to him.

Demand Single Chanel – Technically,Demand-Assigned Single Channel, DASA. This modeoffersoperation on single channel, which is often requested by the users. The broadcast is accessible only on either 5 kHz or 25 kHz via the control system of DAMA waveforms.

TDMA/DAMA – Both employ new waveforms, as detailed in the standards. And, this mode shares channels on 5 kHz and/or 25 kHzbandwidth.

DAMA Modems and systems offereasy prioritization technique for command type nets, and its minimum percentage operation is just the thing for support/logistic nets.

DAMA technology enables deployment and redeployment of a communication channel in a network to clients that don’t use it continuously. The technology works by assigning channels on the basis of requests received from client terminals to a network control system, and also returning an unused channel to the central pool for redeployment to other users of the network.

Block Up converters are used for up linking satellite signals. As the name suggests it converts the frequencies of lower bands to upper bands. The modern BUCs use phase-locked loop local oscillators, and they require a 10 MHz frequency external reference to maintain the accuracy of the frequency transmission. The BUC can convert the frequencies from L-band to S band, C-band, X Band,Ku-band, DBS Band and Ka-band.

Raditek.com offers a comprehensive range of Block Upconverter BUC to meet the demand raised by various industries and sectors, including army, navy, and telecommunication and satellite communication. Check out below the key features of BUCs offered by Raditek –

• L to X-Band BUC – The Company offers BUC that can convert frequencies from L-Band (950-1450 M) to X-Band (7.9-8.4 G). These devices come with easy integration option with SSPA to give higher performance.

• L to C-Band BUC – This Block Upconverter can efficiently translate the frequencies of L-Band to C-Band (5.85-6.75 MHz). These converters are quality checked for superior performance, and can withstand the freezing -10 °C as well as the melting 50 ° C, and 95% atmospheric humidity, muscularly, without experiencing any deterioration in performance. Raditek’s BUCs are designed to be compact units and have user selectable spectrum inversion.

• L to Ku-Band BUC – Raditek’s Ku-Band Block Upconverter BUCs is an economical satellite communication up linking RF in an outdoor transmitter. Engineers can transmit data as well as voice via these communication modules.Single channels per carrier (SCPC) configuration is covered, it is also suitable for multi Channel per Carrier (MCPC), Demand Assigned Multiple Access (DAMA) and Time Division Multiple Access (TDMA). Suitable for all Ku-Band frequencies, this compact, low-cost BUC offers easy installation and great monitoring and control options.

• L to Ka-Band BUC – These small and light weight new Ka-Band BUCs are ideal for mobile and satellite uplink applications. Designed to be mounted on the feed horn, the BUC has excellent efficiency and consumes less than 80W for 2, 3 & 5W Ka-Band BUC. Innovative and efficient thermal design makes this BUC one of the smallest, lightest and most reliable in the industry.

These are some of the most popular BUCs being offered at Raditek.com. With redundancy-ready features, these units can be easily configured to work in 1:1 and 2:1 redundant modes.

To explore the entire selection of Block Upconverter BUCs, please visit the website https://raditek.com/systems/satcom/block-upconverter.html

In the last 10-15 years traffic on Satcom Networks has ex-grown exponentially. Data services (Internet) are the major user of bandwidth followed by voice. Bandwidth is a scarce resource as it is limited by the Satellite capacity. The sharing of bandwidth is a primary focus area by network and communication provider.

DAMA Defined

DAMA (Demand Assigned Multiple Access) provides this need for sharing a limited resource as and when required. This technology is defined as using a channel only when required by clients.A user terminal requests the use of a communication channel via a satcom modem. The request is logged to a network control system (NCS). After the user has completed the task the channel reverts back to the NCS and is assigned to the next user.

How DAMA Works?

This system is a useful addition in areas where network bandwidth is used by many clients and PAMA (Permanently Assigned Multiple Access) is not possible. Communication channels are dual carrier frequencies used for transmission and receiving signals. The system ensures that once a channel is allotted a particular time slot it is not available for others until their session has ended. The sequential use of a single channel by many users and at different times allows for maximum use of the channel. For example a six channel system using DAMA modems can allow six conversations at the same time with multiple nodes whereas a six channel PAMA employed system on a similar network can also have six conversations but no other nodes can use the channel when it is not being used.

DAMA Usage

This technology is used mainly for satellite communications particularly in VSATs (Very Small Aperture Terminal). VSATs primary function is on-the-move communications. Maritime use by onboard VSATs allows for internet and voice access via satellites that are in geosynchronous orbits allowing for very fast and reliable ship-to-shore communication or ship-to-ship through satcom modems.

DAMA was designed in 1968 by the United States government primarily for the military. As communication needs expanded private telecommunication players adopted this standard and brought it to mainstream communication.

DAMA technology ensures reliable communication connectivity when satellite bandwidth is limited and cost is an important consideration. Its use in DAMA modems has become an industry standard used by Raditek and other leading telecommunication technology hardware manufacturers.

For more Info https://raditek.com/systems/satcom/SMART-IP-Switched-Router-Modem.html

With the newer high Capacity Satellites the use and importance of satellite communication has grown to transport Digital information including radio and television signals, phone and high speed internet data.

The devices used for accomplishing satellite communications have developed adding Ka band and High capacity satcom modems. Check out the following subsections that attempt to highlight some of the most popular telecom systems offered by Raditek –

SATCOM Modems– Raditek offers a complete range of Star configurationHUB and Remotes and the more efficient Mesh Technology for large networks. Our Using the Raditek, DAMA‐Demand Assigned Multiple Access based, DREAM modem we can offer-

• A stand‐alone SCPC link (to: 22Mbps, 16QAM, TPC or LDPC)

• An DAMA‐Demand Assigned Multiple Access / BOD‐Bandwidth On Demand IP based STAR and MESH network

• A secure link for Banking including remote ATM’s and classified communications

BUC – Block Up converter, up links the communication transmission. Raditek has a broad selection of BUC both indoor Rack mounted and Outdoor Unit (ODU) SATCOM systems for S, C, X, Ku, DBS and Ka bands.

SSPA – Solid State Power Amplifiers are often embedded with its BUCs, with powers up to 1200Watts at Ku Band

BDC – Block down Converters are available in indoor and outdoor models with standard and extended performance on S, C, X, Ku, DBS and Ka bands.

LNB & LNA – The primary purpose of Low Noise Block Downconverters & Low Noise Amplifier is to convert the extremely low level satellite signals so that they can be demodulated by the satellite modem.

Raditek offers Satcom Antenna from 0.5M to 22M diameter, They can be fixed position or more sophisticated models that will auto position to a specific satellite. These can be man portable, including segmented models that can be Fly away, ie for TV Satellite newsgathering, Vehicle mounted were the antenna can stow flat while the vehicle is in motion, We also have our IOTM series which can be mounted on vehicles, boats and trains offering Internet On the Move.