UHF power LDMOS transistor

BLF898(S) is a new 50 Volt LDMOS power transistor for use in UHF (Digital) Television Broadcasting and CW /pulsed CW Industrial, Scientific and Medical (ISM) applications.

With its 180W Watt average DVB-T power capability in class-AB the BLF898(S) offers the highest power available in a single transistor for the UHF Broadcast market.

This power capability it is extremely well suited for the new ATSC3.0 broadcast standard which requires a higher peak-to-average power capability than the previous ATSC standards.

Its excellent ruggedness performance makes the BLF898(S) ideal for both digital and analog transmitter applications.

BLF898(S) is designed for use in a-symmetrical classical Doherty configuration in combination with one of the leading products in this market BLF888B, as well as for use in a-symmetrical Odd-Mode Doherty applications.

A classical Doherty reference design is currently in development and will become available end of 2017. Expected power capability of the Doherty amplifier is 300Wavg with a minimum efficiency of 45%.

For CW /pulsed CW ISM applications, BLF898(S) offers 900 W power capability in the UHF frequency band.

RF, Microwave and Millimeter Wave Amplifier Accessories

Heat sinks and power/control cables are critical components when deploying RF and microwave power amplifiers. A functioning power amplifier will generate elevated levels of heat which requires proper dissipation via a heat sink to ensure the internal circuit assembly does not become damaged from extreme high temperature exposure. Additionally, high quality power and control cables are essential to the optimal operation of RF power amplifiers.

To help address these amplifier requirements, we have just released a series of heat sinks and power/control cables to address your RF power amplifier deployments.

Features include:
Heat Sinks With and Without Cooling Fans
Model-Specific and General Configurations
AC and DC Power Supply Options and Control Cable Interfaces
Amplifier Mating Control Connector Interfaces
Thermal Gaskets Included

Our new RF power amplifier accessories are in-stock and available to ship immediately. For additional information and specifications, please contact Vermont Rep.

New Straight Waveguide Sections to 110 GHz

Waveguides are often the components of choice for critical systems used in aerospace, defense, industrial, test and instrumentation, telecom and medical applications. This is because waveguides offer both high power handling capabilities as well as boast lower signal loss. To complement our extensive in-stock selection of waveguide components, we have just added a brand new series of straight waveguide sections in sizes from WR-10 to WR-137.

Features include:
• Section lengths from 3 to 12 inches
• Frequency range of 5.85 GHz to 110 GHz in thirteen waveguide bands
• VSWR as low as 1.03:1
• Oxygen Free Hard Copper (OFHC) or copper alloy construction
• UG, CPR and UBR Style flanges

Our new straight waveguide sections are in-stock and available to ship immediately. For additional information and specifications, please contact Vermont Rep.

Waveguide Electromechanical Relay Switches

Waveguide electromechanical relay switches are important devices widely used in applications such as electronic warfare, electronic countermeasures, microwave radio, VSAT, SATCOM, radar, research and development, space systems and test instrumentation.

To facilitate the demand for these components, we have recently released a series of 28 new waveguide electromechanical relay switches that offer full waveguide performance covering C, X, Ku, K and Ka frequency bands from 5.85 GHz to 40 GHz.

Features include:
• SPDT and Optional DPDT Configurations with Latching Self Cut-Off Actuators,
TTL Logic, and Position Indicators with Manual Override
• Patented Motor Drive with Arc Suppression
• Support WR-137, WR-112, WR-90, WR-75, WR-62, WR-42, and WR-28 Waveguide Sizes
with O Rings for Pressurized Operation
• Power Handling Capability up to 12 kW CW and 320 kW Peak
• Environmentally Sealed Quick Connect DC Control Connector & Mate Included
• Fully Weatherized Rugged Packages Designed for 100% Humidity Exposure and -40°C to +85°C Operating Temperature

Our new waveguide electromechanical relay switches are in-stock and available to ship immediately. For additional information and specifications, please contact Vermont Rep.

VPT Expands its VXR High-Reliability Line_x000D_ Dual Output DC-DC Converters Completes the VXR Series Offering

VPT, a HEICO company (NYSE:HEI.A) (NYSE:HEI), today released its dual output VXR Series DC-DC converters to augment its offering of advanced high-reliability COTS products. Optimized for a broad range of programs from military ground vehicles to commercial and military aircraft, the VXR Series products feature wide input voltage ranges and advanced packaging technology for superior operation in harsh environments. The VXR Series now includes both single and dual output offerings from 7 Watts to 100 Watts as well as 2 to 20 Amp EMI filters.

The VXR Series dual output DC-DC converters feature two independently controlled and isolated outputs which provide zero cross-regulation. Each output can be configured as positive, negative or stacked allowing for a broad range of output voltage configurations. Additionally, the output voltages can be ordered as unmatched pairs as a standard product option providing a vast range of flexibility within an overall power system design.

“The entire VXR Series of products has a robust mechanical design that is highly efficient over a wide input voltage range including significant input transient capability,” said Jeremy Ferrell, VPT’s Manager of Standard Product Engineering. “Also, the proprietary two-stage topology provides incredibly fast transient response time without the use of optoisolators.”

In addition to high efficiency and high reliability, the VXR Series features its proprietary V-SHIELD® advanced packaging technology. V-SHIELD® is an integral epoxy encapsulation which incorporates EMI shielding and dual-sided thermal conduction. It is highly resistant to chemical, solvent and salt environments and is fully compatible with high-volume manufacturing processes including wave solder, cleaning solvents, high-pressure sprays and aqueous wash.

An additional update to the VXR Series family of DC-DC converters is the capability of the single output converters to now meet the 100 Volt surge requirement of MIL-STD-1275 as well as DO-160. The 100 Volt surge operation is achieved without adding external components to the converters.

“Programs requiring high reliability and cutting edge performance while potentially operating in harsh, taxing environments are prime candidates for the efficiency and durability of the VXR Series of DC-DC converters and EMI filters,” said Monty Pyle, VP of Sales and Marketing. “The extension of this product family illustrates our commitment to innovation based on proven design heritage.”

The VXR Series single and dual output DC-DC converters and VXR Series EMI filters are available for immediate sale. Additional information on the VXR Series and specific product datasheets can be found within VPT’s COTS product information.

For quotes please contact Vermont Rep.

Specifying Blind Mate Connectors

A blind mate connector is used when access to the connection point is not possible, typically caused by physical space constraints. A common application for blind mate connectors is when two circuit boards need to be mated. In RF and microwave applications, blind mate connections can become very challenging and require specially designed blind mate connectors to ensure a constant and uniform signal between circuit boards or modules.

Due to their small-footprint design and ease of connection, blind mate connectors are often used in military applications where electronic hardware has to fit into tight spaces with limited access. These connectors can also withstand harsh vibration and temperature extremes making them ideal for rugged field applications. Similar requirements are also making blind mate connectors a popular choice in the consumer electronics market due to the growing complexity and density of board designs.

There are many types of blind mate connector styles available on the market today. The most common RF/microwave blind mate connectors include BMA, SMP and Mini-SMP series connectors, all stocked by Pasternack.

More information on how to specify blind-mate connectors can be found on the link below.

BMA Connectors and Adapters

Perfect for use in limited-access blind mating scenarios, high-density panel connectivity, phased array systems, RF backplanes and high-speed switching applications, the new series of BMA connectors and adapters feature high quality construction and materials along with both commercial and military versions to suit every application.

These new BMA connectors and adapters feature gold-plated BeCu contacts, and many models provide radial and axial float to help with alignment.

Features include:
• Max. Operating Frequency of 22 GHz
• Excellent VSWR as low as 1.15:1
• Hermetic BMA versions available
• Float-mount versions available

Pasternack´s new BMA connectors and adapters are in-stock and available to ship immediately. For additional information and specifications, please contact Vermont Rep .

Differences in Power Divider Technology Explained

A resistive divider entails a relatively simple design, being made up solely of resistors, making them generally inexpensive. A resistive divider incorporates resistors in the paths of the divider. The frequency response of a resistive divider can extend over a wide range of frequencies provided high quality components and proper construction methods are used. A disadvantage of resistive dividers is that the insertion loss is higher: 6 dB for a 2-way power divider as opposed to roughly 3 dB for a reactive or Wilkinson design.

A reactive power divider is a T-junction power divider combined with a quarter-wave transformation. A reactive power divider has a narrower bandwidth than the resistive divider because of the reactive quarter-wave transformer.

A reactive power divider also has lower insertion loss than both resistive and Wilkinson designs and better isolation than a resistive power divider. Reactive power dividers are often used for high power or low passive intermodulation (PIM) applications since they have no resistors.

A Wilkinson power divider has two quarter-wave microstrip lines and utilizes a resistor between the outputs to provide high isolation performance providing the highest isolation of the three power divider designs.

Here are some advantages and disadvantages of the different types of power dividers.

Pasternack offers a wide selection of RF power dividers that are in stock for same day shipping.