Yaesu FRG - 7000
Manufactured by Yaesu Musen Company Ltd., Tokyo.
As a successor to the FRG-7, Yaesu launched the FRG-7000 in 1977, a communications receiver still based on the Wadley Loop circuit with an integrated digital frequency display.
- Principle: triple conversion superhet, IF 45 MHz, 2 - 3 MHz, 455 kHz.
- Operation modes: A1 with BFO, USB/LSB, AM (A3)
- Frequency Range: FM broadcast band, LW, MW, 6 x SW (1.6 - 26.1 MHz)
- Frequency display: digital display, 1 kHz
- Frequency memory: none
- Signal processing Attenuator, Noise Limiter, Preselector
- Features: Clock, timer
- Sensitivity SSB <0.7 μV, AM (A3) < 2 μV / Selectivity: 5.2/13.9 kHz / SSB 3.6/8.4 kHz (-6/-60 dB)
- Mains operation: 110, 220 V
- 360 x 125 x 295 mm, weight 7 kg
The tabletop receiver has a weight just under 7 kg and measures 36 x 12.5 x 29.5 cm. It has a grey metal cabinet and a black front panel. The set can be operated from various mains voltages from 100 - 234 volts.
The loudspeaker grill is located on the front panel on the far right, below it are the jacks for headphones and tape output.
In the upper row of controls, the preselector with its colourful dial is found at the top left, the colours representing the different band ranges. To the right is the signal strength meter, and below that is the tuning knob for the MHz digits of the frequency. The main tuning knob below the red LED frequency display is used to set the kHz digits of the desired frequency. The digital frequency display can be switched off with a small button to save battery power. Further to the right is digital display of the quartz clock, which is also red and somewhat smaller; the clock can display two time zones and has timer functions.
In the lower row of controls, the small grey push-button for the attenuator is located on the far left under the preselector, next to it is the band switch with coloured backlit marks for the individual band ranges, the colours correspond to those of the preselector dial. Right next to it is the main power switch, furthermore the fine tuning control and the main tuning knob. The operation mode switch for the LSB/USB and AM / AM modes with noise button and the double control for tone control and volume control are located on the right.
The operation is easy if you understand how to operate a Wadley-Loop receiver: First, set the MHz digit of the desired frequency (e.g. tune to 6). On the FRG-7000, a red indicator signals „Unlock“ if the synthesiser is not locked on a MHz channel. With the main tuning knob, the kHz digits of the frequency are set next (tune to 1 5 5), the frequency display has an accuracy of 1 kHz. The band selector (in fact it's the preselector band selector) is set to the position corresponding to the frequency, in our case the green one (4.0 - 11.0), and the preselector is peaked to signal maximum slightly above the 6 MHz mark using the small dial (the green dial applies). Now Radio Austria International from Vienna should be heard on 6155 kHz. With the fine tuning control the frequency can be adjusted slightly. However, due to the tuning scheme, the FRG-7000 is more suitable for search reception within a band than for quickly checking frequencies of a station in different wavebands, there are no digital frequency memories.
The receiver has its shadow and sunny sides: the combination of Wadley loop circuitry and digital frequency display is interesting. In contrast to the FRG-7, the digital frequency display is very convenient, but the fact that the use of a preselector is still necessary complicates the operation again. The lack of electronic frequency memories is still acceptable, as only receivers of the next generation with PLL synthesizer usually have this possibility.
The FRG-7000 suffers from a relatively high inherent noise, probably due to the synthesiser and especially the frequency display and possibly the quartz clock. The fact that the set sometimes tends to overload and that there is only a 25 dB attenuator and no RF gain control is another disadvantage, but what is missed most is the lack of selectable IF filter. The set comes with a single (too wide) AM bandwidth.
Thus, the colourful FRG-7000 remains an exotic „bird of paradise“ in the collection due to its circuitry, but nevertheless a serious general coverage receiver that is suitable for DX with some drawbacks and can easily catch external shortwave services of international broadcasters.
Triple conversion superhet, Wadley loop frequency processing
The set is completely solid state.