General Description; Features; Specifications; G E N E R A L D E S C R I P T I O N - JRC NDR-91 Instruction Manual

1 . G E N E R A L D E S C R I P T I O N
The model NRD-91
Receiver is a highly reliable receiver with the simple circuit com-
position, developed by JRC based on our many year's experiment and technical results. PLL
syuthesizer is equipped in the first local oscillator to prvode the high accuracy of frequency
setting, so that this receiver has enough performances for use in the SSB mode as a back-up
receiver.
1 . 1 F E A T U R E S
I ) Provided with digital synthesizer of PLL type
The reference oscillator with the high stability (t5 x l0-6ppm) ensures high stability of
fiequencies over a wide frequency range for reception.
2) Wide receiving frequency range
This receiver covers the wide receiving frequency range from 90 kHz to 29.9999 MHz.
3) Digital indication of receiving frequencies
This receiver is provided with light emitting diodes for a numerical display of the
receiving frequency from 100 Hz digit to l0 MHz digit.
Therefore, the frequency can be set correctly.
4) BC band rejector
BC band rejector reduces the interferences such as cross-modulation and intermodulation
due to the strong radio wave of the broadcasting wave generating during receiving the
MHF radio wave.
5) Directly connected to Teleprinter and FAX
The line output terminal, 600St 0 dBm, is provided. By adding the optional crystal, FSk
or FAX can be received in the AUX mode. At this time, the center frequency of the line
output is 1.7 kHz and l.9 kHz respectively.
6) Entirely modular construction
The circuits are accomodated in the plug-in type printed circuit boards (excluding the
panel section and power supply unit). Thus, maintenance and check are facilitated.
1) Operable on either AC or DC power
The receiver can be operated on AC or DC power by changing the power switch on the
panel.
1 . 2 S P E C I F I C A T I O N S
I ) Receiving frequency range
9O kHz to 29.9999 MHz
2) Circuit system
Double superheterodyne with up-conversion system using a phase-locked digital
frequency synthesizer.
I st lF- : 7 0.45 5 MHz
2nd IF : 455 kHz
3) Reception mode
CW(AlA), MCW(A2A, HzA), DSB(A3E), SSB(R3E, H3E, J3E) and FSK(FlB) or FAX
( F 3 C )
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