This is the Futaba R149DP 9-Ch 36 / 40 MHz PCM 1024 Dual Conversion Receiver.
Narrow band spacing and dual conversion signal filtering combined to provide exceptionally clear interference free reception and amazingly smooth and accurate control.
One 36 / 40 MHz FM Dual Conversion Receiver Crystal.
Narrow Band: 20KHz Intermediate Frequency 1st IF: 10.7MHz 2nd IF: 455kHz. Power Requirements: 4.8 to 6.0 volts (shared with servos),Current Drain: 15mA.
Length: 2.16" (55.0mm)
Width: 1.28" (32.6mm)
Height: 0.82" (20.8mm)
Weight: 1.2 oz (34.5g)