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     Northam, Western Australia
     QRZ Page: VK6YSF

 

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YAESU FRG7

The Yaesu FRG-7 is an all solid state synthesized communications receiver designed to cover 500 KHz to 29.9 MHz.  The FRG-7 is a triple conversion super heterodyne receiver utilizing the Wadley Loop System.

 

Below are the detailed technical specifications and features for the Yaesu FRG-7

 

General Specification

Details

Type

General Coverage HF Communications Receiver

Manufacturer

Yaesu Musen Co. Ltd (Japan)

Model Years

Introduced ~1976

Frequency Coverage

500 kHz – 29.9 MHz (continuous) in 1 MHz bands

Operating Modes

AM, USB, LSB, CW

Tuning Method

Wadley Loop system (drift-free tuning)

Dial Readout

Analog main dial + MHz band switch (in 1 MHz steps)

Power Supply

120/220/240 VAC (internal) or 13.8 VDC (external DC jack)

Antenna Input

SO-239 (50 ohm), Hi-Z screw terminals

Dimensions (W×H×D)

330 × 165 × 260 mm (13 × 6.5 × 10.2 in) approx.

Weight

~6.5 kg (14.3 lbs)

 

 

Receiver Specification

Details

Receiver Type

Triple Conversion Superheterodyne

IF Frequencies

1st: 55.845 MHz

2nd: 3.395 MHz

3rd: 455 kHz

Stability

Excellent (Wadley Loop eliminates main oscillator drift)

Sensitivity

AM: ~1 µV for 10 dB S+N/N

SSB/CW: ~0.5 µV

Selectivity

~4 kHz @ –6 dB (standard ceramic filter)

Image Rejection

>60 dB (typical)

AGC

Yes (automatic gain control, non-adjustable speed)

S-Meter

Analog (mechanically damped needle type)

Audio Output

~2 W into 8 ohms

Audio Connectors

1/4" headphone jack, external speaker terminals

Bandwidth

Fixed (no variable bandwidth or IF filtering options)

 

 

Photo 1 Yaesu FRG-7 communications receiver.

 

 

Features & Controls

  • Wadley Loop Circuitry
    • Provides stable, drift-free operation across full HF spectrum
    • 1 MHz band segments selected via MHz switch
    • Fine tuning via analog dial

  •  Mode Selector – AM / USB / LSB / CW

  • Preselector – Tunable front-end for peak performance

  • BFO – Built-in for CW/SSB demodulation

  • Built-in Speaker – 3" internal speaker for onboard listening

  • External Power Jack – 13.8 VDC input for mobile/portable operation

  • Front Panel Metering – Signal strength (S-meter)

 

The Wadley Loop is a clever radio frequency conversion technique developed in the 1950s by Dr. Trevor Wadley, a South African engineer. It was designed to eliminate oscillator drift—a major problem in analog receivers before the widespread use of phase-locked loops (PLLs) and digital synthesizers.

It was most famously used in radios like the Racal RA-17, Yaesu FRG-7, and others that needed stable tuning over wide frequency ranges.

 

Receiver review: https://medxr.blogspot.com/2020/07/retro-receiver-review-16-yaesu-frg-7.html

 

 

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Page initiated 01 June 2019

Page last revised 05 November, 2025

 
 

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   Notice Board

VK6YSF JS8Call and Olivia 8/250 operations.

Current activity is generally focused - though not restricted to - JS8Call operations on the 20m, 30m, and 40m bands.

Currently there is a particular emphasis on JS8Call on the 10 and 12 m band between 00:00 and 12:00 Z, often extending beyond this period.

Olivia 8/250 is used occasionally on the 20m band.

Proposed band and mode activity is often communicated on HamSpots: https://hamspots.net/js8/ or my profile on 

X: https://x.com/vk6ysf97230 .  

Feel free to contact me to discuss or arrange a schedule for a contact.

Post date: 7 December 2025

 

Western Australian SSTV net 

Popular Western Australian SSTV net for both digital and anolog SSTV.

Generally found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)

For more details: https://www.wasstv.net/wasstv.net/index.html

Post date: 8 December 2025

 

VK6MJM LF (136kHz) and MF (474kHz) Beacon

VK6MJM is a  LF/MF station located in Manjimup, Western Australia.

Common Mode: FST4W 300 (Similar to WSPR)  

Note: other modes and sub-modes may be used.

Station details were presented by Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter Hall VK6HP at PerthTech

QRZ Page: VK6MJM on QRZ.com

Post date: 10 March 2025

 

 

 
 

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Amateur Radio Station VK6YSF - Promoting amateur radio communication and experimentation.