This manual provides a complete description of the JRC NRD-92 and NRD-93 receivers, including their high‑stability digital synthesizers, automatic tuning input filters, noise‑blanker, and optional pass‑band shift functions. It outlines the general construction, modular plug‑in PCB design, and the various reception modes such as CW, SSB, DSB, PSK, and FAX.
The document also details installation steps, wiring diagrams, operation panels, troubleshooting procedures, and maintenance checks. Appendices contain block diagrams, part arrangements, and contact information for JRC support.
| Receiving frequency range | 50 kHz to 29.99999 MHz |
|---|---|
| First IF | 70.455 MHz |
| Second IF | 455 kHz |
| Reception modes | CW, MCW, DSB, SSB, PSK, FAX (NRD‑93 also USB/LSB) |
| Image rejection ratio (NRD‑92) | ≥ 60 dB |
| Image rejection ratio (NRD‑93) | ≥ 70 dB |
Use the MHz‑band setting knob, the UP/DOWN switch, and the 10 kHz/rotation TUNE knob; the display automatically carries and borrows digits.
The NRD‑92 provides an image rejection ratio of 60 dB or more.