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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
(W×H×D)
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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 µV for 10 dB S+N/N
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SSB/CW:
~0.5 µV
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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 13 July, 2025
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Space Weather
https://www.swpc.noaa.gov/
Notice Board
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VK6YSF JS8Call,
FSQ and
Olivia 8/250 operations.
Current
activity is generally, however not restricted to operations with
JS8Call, FSQ and Olivia 8/250 on the 20m and 40m 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.
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VK6MJM LF (136 kHz) and MF (474
kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Mode: Mode: FST4W 300 (Similar to WSPR)
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
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