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Contact Details
Peter Miles
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
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General
Specification
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Details
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Type
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General
Coverage HF Communications Receiver
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Manufacturer
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Yaesu
Musen Co. Ltd (Japan)
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Model
Years
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Introduced
~1976
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Frequency
Coverage
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500
kHz 29.9 MHz (continuous) in 1 MHz bands
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Operating
Modes
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AM,
USB, LSB, CW
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Tuning
Method
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Wadley
Loop system (drift-free tuning)
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Dial
Readout
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Analog
main dial + MHz band switch (in 1 MHz steps)
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Power
Supply
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120/220/240
VAC (internal) or 13.8 VDC (external DC jack)
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Antenna
Input
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SO-239
(50 ohm), Hi-Z screw terminals
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Dimensions
(WืHืD)
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330
ื 165 ื 260 mm (13 ื 6.5 ื 10.2 in) approx.
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Weight
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~6.5
kg (14.3 lbs)
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Receiver
Specification
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Details
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Receiver
Type
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Triple
Conversion Superheterodyne
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IF
Frequencies
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1st:
55.845 MHz
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2nd:
3.395 MHz
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3rd:
455 kHz
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Stability
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Excellent
(Wadley Loop eliminates main oscillator drift)
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Sensitivity
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AM:
~1 ตV for 10 dB S+N/N
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SSB/CW:
~0.5 ตV
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Selectivity
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~4
kHz @ 6 dB (standard ceramic filter)
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Image
Rejection
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>60
dB (typical)
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AGC
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Yes
(automatic gain control, non-adjustable speed)
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S-Meter
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Analog
(mechanically damped needle type)
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Audio
Output
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~2 W
into 8 ohms
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Audio
Connectors
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1/4"
headphone jack, external speaker terminals
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Bandwidth
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Fixed
(no variable bandwidth or IF filtering options)
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Photo 1
Yaesu
FRG-7
communications receiver.
Features
& Controls
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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
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Mode
Selector AM / USB / LSB / CW
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Preselector
Tunable front-end for peak performance
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BFO
Built-in for CW/SSB demodulation
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Built-in
Speaker 3" internal speaker for onboard listening
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External
Power Jack 13.8 VDC input for mobile/portable operation
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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 drifta 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
TOP
OF PAGE
Page initiated
01 June 2019
Page
last revised 05 November, 2025
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Space Weather
https://www.swpc.noaa.gov/
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Nikola Tesla, born on 10 July 1856, was one of
history's most influential inventors.
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Notice Board
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VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 30m, and 40m bands.
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
.
Post
date: 5 July 2026
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Local
Repeaters
The Local Repeaters page has been updated with expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region.
See: https://vk6ysf.com/local_repeaters.htm
Post
date: 5 July 2026
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MARMOTSat
An exciting upcoming amateur radio CubeSat
Proposed
launch date: 7 July 2026
Expected payload includes:
145.875 MHz AX.25 packet digipeater
436.125 MHz Telemetry & command (digital)
29.410 MHz CW telemetry beacon, DVB-S2 experiments.
https://marmotsat.ca
https://www.propagationlab.ca/satellite/
Post
date: 5 July 2026
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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
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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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