Yaesu FRG-7700
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The Yaesu FRG-7700 is an HF receiver for the radio amateur and for the commercial market. It is a metal-cased receiver with a polymer front and it is suitable for reception in the AM, FM, CW and SSB modes. Its frequency coverage is from 150 kHz – 30.0 MHz continuously in 30 switchable bandsegments. Its frequency readout is available in a traditional analog (dish) mode as well as in a digital display mode.
Called a “budget receiver”, the FRG-7700 was released in 1978 as successor to the FRG-7000 by the Japanese Yaesu Musen Corporation and priced at approximately US$450. This type was in production until 1982.[1]
Technical description
The FRG-7700 is a superheterodyne type receiver going up to 48 MHz in the Intermediate Frequency trap, followed by a fully synthesized local oscillators in the 1st and 2nd mixer unit and thus creating a VFO that is reasonably stable after warm-up.
Accessories
- DC-7700 is a connecting device to use 12V DC power
- FF-5 is a lowpass filter to block AM noise interference in the CW/SSB modes
- FRA-7700 an HF active antenna for proper indoor reception without external antennas
- FRT-7700 is an HF antenna tuner for proper tuning of external antennas
- FRV-7700 is a converter for receiving each 3 bands of VHF signals and making them audible in the HF bands. There used to be 6 different types available able to receive
- 118-130, 130-140, 140-150 MHz;
- 50-59, 118-130, 140-150 MHz;
- 140-150, 150-160, 160-170 MHz;
- 70-80, 118-130, 140-150 MHz;
- 118-130, 140-150, 150-160 MHz and
- 118-130, 150-160, 160-170 MHz
- MU-7700 is an external memory unit for 12 fixed channels which may be installed at the back of the housing
Tech Specs
- Frequency range: 150 kHz – 30.0 MHz
- Sensitivity:
- 0.15 – 0.3 MHz: 30 microV/500 Ohm AM; 3 microV/500 Ohm SSB/CW
- 0.3 – 2 MHz: 25 microV/500 Ohm AM; 2 microV/500 Ohm SSB/CW
- 2 – 30.0 MHz: 5 microV/50 Ohm AM; 0.5 microV/50 Ohm SSB/CW; 1 microV/50 Ohm FM
- Selectivity:
- 6 kHz - 6dB 15 kHz - 50dB AM medium; 2.7 kHz – 6dB 8 kHz – 50dB SSB/CW; 15 kHz – 6dB 30 kHz -40dB FM
- Stability: less than 2 kHz from 0-30min after starting up; thereafter less than 1 kHz
- Antenna: 0.15 – 2 MHz 500 Ohm unbalanced; 2 – 30.0 MHz 50 Ohm unbalanced
- Audio Output: 1.5 W for 8 Ohm @ 10% THD
- Power Requirements: (AC) / 100 - 240V
- Dimensions: 33.5 x 13 x 22.5 cm
- Weight: 6 kg without memo unit and internal battery
References
- ^ Jerome S. Berg (October 2008). Listening on the short waves, 1945 to today. McFarland. pp. 299–. ISBN 978-0-7864-3996-6. Retrieved 9 December 2011.