Aiwa ST-R22
The Aiwa ST-R22 is a compact FM/AM stereo tuner from Aiwa's iconic 22 Series of micro hi-fi components. It offers high-fidelity radio reception in a remarkably small package, combining a traditional string-driven analog tuning mechanism with a digital frequency display, all housed in a sleek metal chassis.
The FM section uses a 3-gang variable capacitor together with three 10.7 MHz ceramic filters, providing good sensitivity and selectivity. FM demodulation is handled by the HA11211 quadrature discriminator IC, while stereo decoding is performed by the uPC1116C IC.
Overall performance is impressive, with stable reception and clean stereo reproduction that exceed expectations for a tuner of this size.
Manufacturer: Aiwa
Status: Defunct company
Source: Wikipedia (Aiwa)
General Specifications
Antenna input: 75Ω & 300ΩFrequency range: 87.3MHz-108.5MHz
S/N sensitivity (50dB): 13±2dB
S/N ratio: >65dB
Distortion: <0.2%
Frequency response (40Hz-15KHz): +0.5,-1.5dB
Stereo separation (1KHz): >42dB
Muting sensitivity: 20±6dB
Dimensions (WHD): 210×71×173.5mm
Weight: 2.0kg
Produced: 1979-1982
Initial price: 120USD
Factory Specification Sheet
Factory specification images are sourced directly from the device's original service manual or user manual. These documents are produced by the manufacturer and provide authoritative information on the product's specifications.
FM Tuner
Measurements of the tuner section were performed using an FM signal generator, with its output fed directly into the antenna input. AM measurements were not conducted.
