1300 000 734

100W RF Power Amplifier - 87.5-108MHz


The PA88108 is a high-linearity solid state RF Power Amplifier (RF PA) for the VHF FM broadcasting band (87.5–108MHz).

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PA88108 Features:

It features a state-of-the-art 4-stage LDMOS solid-state output that can provide up to 100w RF output power in single carrier applications. For Multiple Carrier Power Amplifier (MCPA) applications, such as multi-channel FM rebroadcast systems, the excellent linearity of this amplifier optimises the number of RF carriers and their individual RF output powers that can be provided - subject to the allowable Intermodulation Products (IM) performance. This full-featured, high performance RF power amplifier is compatible with narrowband and wideband modulation schemes and is self-contained with an integral PSU and high-volume fan cooling system. Dry relay alarm contacts are provided for connection to external monitoring equipment if desired. The unit is housed in a compact 5RU 19-inch rack mount enclosure for convenient installation and maintenance.

-100W single carrier or Multiple Carrier Power Amplifier (MCPA) operation
-High-linearity, 4-stage, 5th generation "State of the Art" LDMOS design.
-ALC built in for absolute control of RF output power
-3 Digit, 7 segment digital display
-Integral fan cooling system
-Remote telemetry with voltage free contacts and sample voltages
-Space-efficient 5RU 19in rack mount enclosure

Note 1. The number of RF carriers and the per-carrier RF Output power capability in multiple carrier (MCPA) applications is subject to the allowable resulting Intermodulation Products (IM) and RF Spurious Suppression performance.
Frequency bands coupled 87.5 to 108MHz
RF Output Power ≥100W (single carrier) / 12 x 2W (example MCPA) adjustable (Note 1)
RF Harmonic Suppression ≥60dB
RF Spurious Suppression ≥70dB (Note 1)
Intermodulation Products Typically -50 dBc (w.r.t. individual carriers)
RF Gain +47dB nominal with adjustable gain
Gain Adjustment 5dB nominal via ALC
RF Input Return Loss ≥ 30 dB
A/C Input Voltage 85 - 240V Full Range
A/C Input Power 400VA nominal
Cooling System Forced air @ approximately 500mᵌ/hr / 13500ftᵌ/hr
Alarm Conditions RF Fault Indication: ≤80W adjustable (red LED on front panel) Reflected Power Fault Indication: ≥5W adjustable (red LED on front panel) Reflected Power Fault Trip: ≥8W adjustable (red LED on front panel with 14 second refresh cycle) Temperature Fault Indi
RF Connectors Input: 'BNC' Type Female Output: 'N' Type Female. A/C Mains: IEC
Temp. Range -10° to +45°C / +14° to +104°F
Relative Humidity 20% to 90% (non-condensing)
Operating Altitude ≤1500m / ≤4920ft above sea level
Mechanical Dimensions 480 x 455 x 225mm / 19 x 18 x 8.86in (5RU)
Weight kg lbs 18.5kg / 40.7lbs (approx)
Front Panel Display 3 Digit, 7 Segment LED Display (Fwd Pwr, VSWR, Temp. °C, Internal PSU Volts, and each amplifier's DC current)

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