Trio / Kenwood R-1000 (Review)
Written by Bryce Ringwood   

The Trio/Kenwood R-1000 amateur communications receiver was intoduced in 1979. It covers 200kHz to 30.000MHz in 30 switched wavebands.

Semiconductors -  Refer to schematic. There are over 60.

Kenwood R-1000 radio receiver

Timer Control - Various options for setting/displaying time etc.

Dim/Bright - Dial lights/ Display
Noise blanker
kHz Tuning
MHz select
Input Attenuator
AF Gain (Volume) and Tone Controls

Selectivity      - Wide/Narrow (AM) - 2 switches - 12kHz and 6kHz
USB               - Selectivity automatically set to 2.7kHz in SSB Mode

AGC time constant automatically set according to mode. (Unfortunately). 

There is a proper 'S' meter .

The set had a bulging power supply capacitor, which was replaced. The attenuator didn't work - it simply needed cleaning, but remains fidgety.

The set uses a PLL frequency synthesizer to generate stable local oscillator frequencies. The receiver frequency is displayed on a dial and on a gas plasma display. I think the display driver and display are the same as those used on the FRG 7700. The display driver IC really is impossible to find, and the display also. (Maybe it can be replaced with a CPU chip and LCD display ?) The whole tuning arrangement is very easy to read and use.


This set is very similar to the Yaesu FRG 7700. I wasn't really able to tell them apart in respect of performance. The set is sensitive, reasonably selective and can take a decent antenna without imploding. Audio quality through the built-in speaker is acceptable - maybe a little bit tinny. The AM bandwidth can be set to 12kHz or 6kHz, so the audio should be even better through headphones. The set is very simple and straighforward to use and works on SSB quite well. The noise blanker is very effective - it uses a noise gate to produce holes of silence.  Note the set automatically makes AGC and bandwidth settings according to mode - or at least, that's the intention!

There is (almost) nothing bad about this set and most people would find it to be an excellent choice of shortwave radio. That is -  If you can find one or prise it away from its present owner. 

Some people don't like separate MHz and kHz tuning - preferring a single knob or tuning control. The only oddity  is the AGC time constant. On AM it should be short, and on SSB/CW it should be long, because of the nature of the signal. The R-1000 seems to have it the wrong way round. Its not a major catastrophe and I wouldn't attempt to modify the set on this score. (Yes, it can be done).

The radio is designed for AM and SSB listening. I don't think it would ever have been the greatest choice for CW afficionados or professional radio amateurs* eager to squeeze the last QSO during a contest. 

The set can be made to operate from 12 volts. There is an odd inclined rear panel arrangement and snap fasteners for separate medium wave and shortwave antennas. As always with solid-state receivers, switch off at the wall when not in use and unplug the antenna. 

Be suspicious if the set you have your eye on has the AGC the correct way round - it means someone has possibly modified the set. Maybe they have carried out other modifications!

The Kenwood R-2000 is a similar radio, but  has the FM band and 10 Memories.

* I think that's what they call an oxymoron, but you know what I mean. I was a radio ham myself, once.

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