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Japan Radio Company Ltd., Tokyo

NRD - 1107D

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überarbeitet am 19.10.2010

The NRD-1107D is an easy-to-use professional grade maritime communications receiver covering the maritime communication shortwave bands only.

Double Conversion

Digital display with 100 Hz resolution,
Maritime bands 1,6 - 25,9 MHz.

AM, CW, SSB (BFO)

Sensitivity

Selectivity

RF-Gain, Antenna tuner

The NRD-1107D is a professional grade maritime communications receiver in 19 inch rack format, I suspect, it was originally built for 110 V, mine has been adapted for 230 V AC use.

The frontpanel is clearly structured, as with all JRC equipment.
The mains switch is combined with the volume control /AF GAIN, at it's left, You find the RF gain control, active only when AGC is switched off.
At the right hand next to the AF gain control, You find the BFO knob for single sideband and CW reception and an antenna trimmer.
Pushbuttons in the left upper part of frontpanel let You select the reception mode: A3J for single sideband reception, A1 for CW morse code receptino and A3A for normal AM reception.
The rotary control "BAND" at it's right selects the maritime bands in 1 MHz segments, the low frequency bands 1,6 - 2 / 2-3 / 3-4 MHz will be selected with pushbuttons, too. One position of the bandswitch activates monitoring of the international maritime emergency frequency of 2182 kHz, I suppose, that the little NRD has been in use as secondary receiver for continuous monitoring the emergency channel quite often.

Because of the selection of available bands, You can recognize easily, that the NRD-1107D has been built for maritime communications use, most of the broadcast bands and amateur radio band segments are omitted.
The position of the bandswitch does control the MHz digit, decadic knobs let You select the 100 kHz, 10 KHz, 1 kHz and 100 Hz digits of the reception frequency displayed on the red LED display.
This operating scheme is found similarly in the Rohde & Schwarz EK 047 receiver, in professional use, the VFO knob is rarely used as most stations are transmitting on fixed frequencies.

The NRD-1107D has no internal speaker, the NF signal is provided from a multi-pole connector at the receiver's rear panel. You also find a SO-239 antenna socket and an earth connector at the back of the set.

Operation of the set is really uncomplicated: Switch it on usind the AF gain control, AGC should be set to ON, to catch Deutsche Welle set the modes switch EMISSION to A3A, BAND switch to 6, use the knob below the digits tu tune the receiver to 6 0 7 5.0 and You can listen to the news from Cologne. To tune in RAF Volmet on 4722 kHz use MODE A3J, BAND 4, the frequency digit knobs to 4 7 2 2 and there You are...

The set has several shortcoming for the shortwave listener: the main problem is tha fact, that this set is not general coverage! A tropical bands DXer will find all necessary bands, the set is not well suited for amateur radio fans. The lack of a main tuning knob to sweep the bands and the lack of memories are further shortcomings. There are no means to "postprocess" a signal, no passband tuning, notch filter, and so on. But the stability, sensitivity and dynamic range of this set are very good.

 

© Martin Bösch 31.12.2008