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Kenwood / Trio - Kenwood Communications, Tokyo

QR - 666

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überarbeitet am 21.10.2010

As a successor for the quite successful 9R-59DS, Trio-Kenwood presented it's solid state QR-666 all wave receiver with continuous coverage from mediumwaves through 30 MHz and an optional FM tuner around 1975.

Single Conversion, IF ? kHz

Analog dial non linear, dial accuracy 10 kHz in the mediumwave band, around 100 kHz in the 30 MHz region, band spread for 80, 40, 20, 15, 10 m ham bands



Selectivity -6/-60 dB

S meter, RF Gain, Noise limiter, Antenna trimmer
User's Manual User's Manual FM Unit FM unit User's Manual Crystal Marker Marker unit

The Trio - Kenwood QR-666 is a completely solid state all wave receiver, with it's dimensions of 360 x 165 x 280 mm and it's weight of 7,3 kg, it is a medium sized desktop receiver slightly bigger then Kenwood's R-1000.
The set features separate coarse tuning and bandspread tuning dials for the amateur bands.

In the middle of the front panel, You find the two characteristic orange - yellow backlit drum dials. The upper one is the main tuning dial with it's tuning knob, below, You find the bandspread tuning dial with calibration marks for the amateur bands.
At the left of the front panel, You find the green backlit signal strength meter and below the pushbuttons for dial lights, STANDBY operation, the mains power switch and the BFO pitch control.
At the right hand in the front panel, You find a row of pushbuttons for the reception modes, the pushbutton FM-BC activates the optional FM tuner. The next pushbutton activates the AFC for FM reception or selects the NARROW or WIDE IF bandwidth. Just below, You find the bandswitch and the antenna trim control, at the right the two rotary controls for RF and AF gain. The crystal calibrator is switched on by pulling out the RF gain knob.

In contrast to the 9R-59D, the QR-666 is equipped with an internal speaker at it's left side of the cabinet.
At the rear of the set, You find connectors for a long wire antenna and a coaxial SO-239 antenna socket as well as the mains and 13,8 V DC connectors. You can control the calibration of the signal strength meter and access some components for alignment of the set from it's top cover.

At the right side of the cabinet, my set has a big rotary knob numbered from 88 - 108, it's the tuning and dial knob for the optional FM tuner. Like in the Barlow Wadley XCR-30, the engineers added an optional FM tuner to let You to listen to Your favourite local FM broadcaster, Sony's ICF-6800W has a rudimentary FM reception capability, too.

Operating the QR-666 is quite straighforward: Switch the set on using the POWER pushbutton, turn the RF gain fully clockwise and the AF gain until You hear a slight noise. To receive "Deutsche Welle" on 6075 kHz, use mode AM, band segment D und use the main tuning knob to find the signal from Cologne somewhere between the 6,0 and 6,1 marks. Use the fine tuning control to adjust for maximum readibility and tweak the antenna trimmer for maximum signal strength.

In conclusion, Kenwood's QR-666 receiver is a simple all wave and amateur band receiver. You can use it for listening to the major international broadcasters signals and for monitoring some amateur radio traffic in CW and SSB modes. Without electronic memories and with it's only rudimentary dial calibration, I would rather recommend a set with digital frequency display for Your first steps on the shortwaves.
The shortcomings with the inferior dial accuracy was already a problem, when this set was new: the smart looking set made shortwave listening quite difficult for beginners, so few of them might have been disappointed by the resulats from the not that cheap set.
From today's point of view, the QR-666 is a collector's item documenting the step between the hollow state 9R-59DS and the later Kenwood R-xxx receivers, in fect it's a direct predecessor of Kenwood's R-300.

further literature:
e: QR-666 at

© Martin Bösch 11.1.2009