nrd515 The JRC / NRD-515.
Is a succesor to the NRD-505 that has won a high reputation, is a pll synthesized communication receiver.
All modes of operation, PLL digital VFO for digital tuning. 96 channel frequency memory, direct mixer and pass band tuning.

Receiving modes: RTTY - CW - USB - LSB - AM.
Reception range:100 kHz. - 30 MHz.
Power:100 - 117 - 220 - 240 Volt ( 50 - 60 Hz. ).
Selectivity ( -6dB ): 6 kHz. ( > 4 kHz. or more at -6dB ). 2.4 kHz.  ( > 2 kHz. or more at -6dB ) . 600 Hz.  ( > 500 Hz. or more at -6dB with optional CFL-260 installed). Aux.> 300 Hz.  ( > 260 Hz or more at -6dB with optional CFL - 230 installed).
Sensitivity:< 0.5µ V 1.6 - 30 MHz. -SSB/CW mode - S/N=10dB. < 2µ V < 100 kHz.- 1.6 MHz. -SSB/CW mode.
Receiving System: 1st. 70.455 MHz. 2nd. 455 kHz.
Frequency stability:Less than 50 Hz. per hour after warming up.
Antenna impedance:50 Ohm to 75 Ohm. (Coaxialinput only A-symmetric ).
Image rejection ratio:70 dB or more.
Audio output:1 Watt at 4 Ohms.
Line-Record output:1 mW at 600 Ohms.
Dimensions:Width 340 x height 140 x depth 300mm.
Weight:7.5 Kg.
Memory unit NDH 518:4 x 24 memory channels standard.
Dimensions:Width 340 x Height 50 x Depth 200mm.
Weight:3.5 Kg.
A collection of JRC NRD-515 NRD-515 oriented diagrams and modificationsTake a look at:PE1ABR's website.