Block Upconverter (BUC)

Product Specifications

Technical details and manufacturing context for Block Upconverter (BUC)

Definition

A Block Upconverter (BUC) is a critical component in satellite communication systems that converts intermediate frequency (IF) signals (typically in L-band) to higher radio frequency (RF) bands (such as C-band, Ku-band, or Ka-band) for transmission to satellites. It amplifies and conditions the signal before sending it to the satellite dish antenna for uplink. The BUC is part of the transmit chain, typically installed at the antenna feed or in an outdoor unit. It accepts an IF signal from a modem or satellite modem, upconverts it to the desired RF frequency using a local oscillator, and amplifies it to a power level suitable for transmission. The output is then fed to the antenna feed horn. BUCs are used in various satellite communication applications, including fixed and mobile earth stations, broadcast uplinks, and VSAT networks. They are available in different frequency bands and power levels to match specific system requirements. Key parameters include output frequency range, input frequency range, conversion gain, output power at 1 dB compression, frequency stability, phase noise, input and output VSWR, DC supply voltage, operating and storage temperature ranges, ingress protection rating, and weight. These parameters must be verified with the manufacturer for the specific model and application. The BUC is typically housed in a weatherproof enclosure (e.g., IP65) and may include thermal management features. It is important to ensure proper power supply, grounding, and signal integrity for reliable operation. Regular maintenance and monitoring of performance parameters are recommended to ensure optimal uplink performance. Always consult the manufacturer's documentation for detailed specifications and installation guidelines.

Working Principle

The BUC receives an intermediate frequency signal from a modem or satellite modem, mixes it with a local oscillator signal to upconvert it to the desired RF frequency, amplifies the signal using power amplifiers (typically solid-state or traveling-wave tube amplifiers), and outputs the high-power RF signal to the feed horn of a satellite antenna. The upconversion process involves frequency translation, where the IF signal is shifted to a higher frequency band. The local oscillator frequency is chosen to achieve the desired output frequency range. The amplified signal is then transmitted via the antenna to the satellite. The BUC may include filtering and conditioning stages to ensure signal quality and minimize spurious emissions.

Common Materials

Aluminum housing, Copper waveguide components, Semiconductor devices (GaAs/GaN transistors), Ceramic substrates, Thermal interface materials

Technical Parameters

Parameter	Typical range	Notes & selection driver
Output Frequency Range	14.0–14.5 GHz	Ku-band uplink
Input Frequency Range	950–1450 MHz	L-band IF
Conversion Gain	60–70 dB	Adjustable
Output Power (P1dB)	40–46 dBm	At 1 dB compression
Frequency Stability	±0.01 ppm	Over temperature
Phase Noise	-100 dBc/Hz	At 10 kHz offset
Input VSWR	1.5:1	Maximum
Output VSWR	1.5:1	Maximum
DC Supply Voltage	24 ±10% V DC	Reverse polarity protected
Operating Temperature	-40–85 °C	Ambient
Storage Temperature	-55–95 °C	Non-operating
Ingress Protection	IP65	WeatherproofIEC 60529
Weight	1.5–2.5 kg	Depending on options

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Local Oscillator
Generates stable reference frequency for upconversion

Material: Quartz crystal, semiconductor components
Mixer
Combines input IF signal with LO signal to produce RF output

Material: Semiconductor diodes, GaAs substrates
Power Amplifier
Amplifies the upconverted RF signal to required power level

Material: GaAs/GaN transistors, copper heat sinks
Filter
Removes unwanted harmonics and spurious signals

Material: Copper, aluminum, dielectric materials
Thermal Management System
Dissipates heat generated by power amplifiers

Material: Aluminum fins, heat pipes, thermal paste

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Block Upconverter (BUC).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Satellite Communication Systems

View system integration details

Manufacturers of Block Upconverter (BUC)

Manufacturer profiles associated with Block Upconverter (BUC).

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Frequently Asked Questions

What is the primary function of a Block Upconverter (BUC)?

A BUC converts intermediate frequency (IF) signals from a modem to a higher radio frequency (RF) band for transmission to a satellite. It also amplifies the signal to a suitable power level for uplink.

What are typical input and output frequency ranges for a BUC?

Typical input frequencies are in the L-band (e.g., 950–1450 MHz). Output frequencies depend on the band, such as Ku-band (14.0–14.5 GHz) as listed in the directory. Always verify with the manufacturer for the specific model.

What is the significance of conversion gain and output power (P1dB)?

Conversion gain indicates how much the signal is amplified during upconversion. Output power at 1 dB compression (P1dB) is the maximum output power before gain compression occurs. These parameters affect the link budget and must be matched to system requirements.

How should I verify the specifications of a BUC?

Consult the manufacturer's datasheet for the specific model. Verify parameters such as frequency ranges, gain, power, stability, phase noise, VSWR, supply voltage, temperature ranges, and ingress protection. Ensure the BUC meets your system's requirements and standards.

Data Basis

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Preliminary Technical Classification

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pressure:	Standard atmospheric pressure (101.3 kPa), altitude up to 4000m
other spec:	Frequency range: 13.75-14.5 GHz (Ku-band), 27.5-31.0 GHz (Ka-band), Output power: 2W to 200W, DC power: 24-48V DC, Phase noise: -80 dBc/Hz @ 10kHz offset
temperature:	-40°C to +70°C (operational), -55°C to +85°C (storage)

Product Specifications

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