RI-65-30

RI-65-30 matching amplifier for aircraft voice messages

RI-65-30 is an onboard matching amplifier used in aircraft voice warning and annunciation systems. The unit is installed between voice message equipment, aircraft radio equipment and pilot headset circuits. Its task is to amplify and match the speech signal so that warning messages are clearly heard by the crew through aircraft telephones and communication channels. In the Almaz-UP passported set, RI-65-30 is supplied together with the Almaz-UP-48 voice message playback unit, RI-65-20 remote control panel and summary passport.

Signal amplification and impedance matching

The RI-65-30 amplifier matches audio signals from connected voice units and radio equipment with pilot headset circuits. Aircraft audio systems may use different telephone types, including high-impedance and low-impedance headsets. Without correct matching, the voice warning signal may be too weak, distorted or unsuitable for the connected load. RI-65-30 adapts the output level and impedance so that spoken warnings remain intelligible in normal flight conditions and during abnormal or emergency situations.

Use with RI-65 and Almaz-UP equipment

RI-65-30 is used in onboard voice message systems such as RI-65-B and may also be included in Almaz-UP aircraft voice warning equipment. In such systems, the playback or voice generation unit creates the warning phrase, while RI-65-30 prepares the signal for delivery to the crew audio circuits. The unit may work together with RI-65-10 voice modules, Almaz-UP-48 playback units and RI-65-20 control equipment depending on aircraft configuration. Compatibility should always be confirmed by the aircraft wiring and system documentation.

Audio output to pilot headsets

The amplifier is designed to deliver a suitable signal to pilot headset telephones. It can provide output levels for high-impedance and low-impedance telephone circuits, depending on the connected load and aircraft system design. This is important because warning messages must remain clear even when the cockpit is noisy or the aircraft is operating in vibration-heavy conditions. When checking the unit, technicians normally verify not only electrical parameters, but also actual audibility and absence of distortion through the aircraft headset channels.

Normal and emergency operation

RI-65-30 is intended for stable operation in both normal and emergency modes. The power consumption differs between these modes, and the amplifier must continue to provide reliable speech signal transmission when the aircraft warning system is active. Since it is part of the warning chain, a fault in the amplifier may appear as weak audio, no voice message, excessive distortion or incorrect routing of speech warnings. Troubleshooting should include the amplifier, connected voice unit, control panel, headset lines, radio interface and aircraft wiring.

Aircraft operating environment

The RI-65-30 amplifier is built for aviation use and is rated for harsh onboard conditions. It must withstand low and high temperatures, humidity, vibration, linear acceleration, shock loads, frost and dew. This is typical for equipment installed on helicopters and transport aircraft, where vibration and changing environmental conditions are normal. The compact housing and low weight allow installation in onboard radio-electronic equipment compartments or other approved aircraft locations according to the mounting documentation.

Supply and identification of RI-65-30

For procurement, the full designation RI-65-30 should be specified. Alternative writing forms such as RI6530, RI 65 30 or ri-65-30 may appear in catalogs, but the correct aviation designation should be confirmed by label and documentation. The unit may be supplied as part of an Almaz-UP complete set or as an individual replacement amplifier. For aircraft use, condition, passport, storage history, connector condition, test status and compatibility with the installed RI-65 / Almaz-UP voice warning system should be checked before installation.

Product Type: Onboard aircraft matching amplifier
Designation: RI-65-30
Alternative Designations: RI6530, RI 65 30, ri-65-30, ri6530, ri 65 30
Function: Signal amplification and impedance matching between voice units, radio equipment and pilot headsets
Application / Where Used: Aircraft and helicopter voice warning, annunciation and crew communication systems
Associated Systems: RI-65-B, Almaz-UP, Almaz-UP-48 and compatible aircraft voice message systems
Associated Equipment: RI-65-10 voice unit; Almaz-UP-48 voice playback unit; RI-65-20 remote control panel; aircraft radio and headset circuits
Input Function: Receives audio signals from voice generation units and aircraft radio equipment
Number of Inputs: 12
Output Function: Delivers matched and amplified speech signals to pilot headset telephones
Supported Headset Types: High-impedance and low-impedance pilot telephones
Gain: 0.7 to 1.5
Output Signal Level at 50 V Input, 1000 Hz: 35–75 V for high-impedance headsets; 5.6–12 V for low-impedance headsets
Linear Amplitude Deviation: Not more than 2 dB up to 120 V output
Total Harmonic Distortion: Not more than 10% at 1000 Hz and 120 V output
Frequency Response Non-Uniformity: Not more than 6 dB in the 300–3400 Hz range
Supply Voltage: 24.3–29.7 V DC
Operational Voltage Range: 20–30 V DC
Power Consumption, Normal Mode: Not more than 10 W
Power Consumption, Emergency Mode: Not more than 16 W
Dimensions: 71 × 108 × 120 mm
Weight: Not more than 1.2 kg
Operating Temperature Range: −60 to +60 °C
Relative Humidity: Up to 98% at +40 °C
Atmospheric Pressure: 0.665–106 kPa
Vibration Resistance: 5–300 Hz up to 49 m/s²
Linear Acceleration Resistance: Up to 98 m/s²
Shock Resistance: Up to 117.7 m/s²
Environmental Conditions: Frost and dew
Standard Almaz-UP Set Position: Matching amplifier supplied with Almaz-UP-48 playback unit, RI-65-20 remote control panel and summary passport
Condition: As specified at delivery
Documentation: Technical passport and operation manuals available upon request

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.