Icom ID-50A Manual page 7

GQ Electronics EMF-390 Multi-Field,
Multi-Function EMF Meter
and RF Spectrum Power Analyzer
Reviewed by John
Leonardelli, VE3IPS
jleonardelli@arrl.net
In this review, we'll delve into the
key features of the EMF-390 and
discuss its applicability in testing
the RF levels in the context of
amateur radio operations. It iden-
tifies RF sources quickly using
sensitive sensors. The RF Radia-
tion mode and RF Spectrum
Analyzer mode apply themselves
to amateur radio as well. How-
ever, bear in mind that this device
is not designed as an RF spec-
trum analyzer but as a multi-
purpose, relative-level RF, EMF,
and ELF meter. The meter can
assist in identifying common
EMF/RF sources of power line,
Wi-Fi, cell phone, microwave,
and commercial broadcast tow-
ers. Also, this is not laboratory-
grade equipment; the manufac-
turer doesn't provide any certi-
fication of accuracy or calibration, but it can be a fun
tool to have around, at least to have an idea of the
relative RF field. (See the Lab Notes for more informa-
tion about the accuracy, or general lack thereof, of this
instrument.)
Description
The GQ EMF-390 provides a three-axis top-mounted
sensor that includes an electrical field and RF sensor. It
also has the capability of providing real-time data log-
ging to a computer. It has audio and visual alarms, and
it can also be used for RF detection indoors and out-
doors (though it is not waterproof).
The EMF-390 is equipped with a sensitive detector that
can pick up even low-level RF signals. This feature is
crucial for accurately assessing relative RF levels, es-
pecially in environments where weak signals may be
present. Its ability to show various transmissions from a
broad-spectrum perspective is also useful.
46 June 2024 QST www.arrl.org
The meter includes a high-con-
trast black-and-white LCD screen
display with a single LED indicator
with four function buttons. The
LCD display provides real-time
readings. The interface is user-
friendly, making it accessible for
both beginner and experienced
operators. The display offers mul-
tiple readings and is readable
outdoors.
The device comes with a nice
protective case, Radiation Safety
reference card (with no certificate
of accuracy), Quick Guide, and
USB-C cable. The device is
equipped with a USB port, used
for data communication and for
external power/charging of the
internal rechargeable Li-ion 3.7 V
dc battery. Battery life is estimated
to be 24 hours before needing a
charge. Using the external power
source, continuous data monitor-
ing is possible using the free GQ
EMF Pro software, available for Windows and MacOS
(see Figure 5).
Software, a USB driver, and an in-depth manual are
available for download from their website. They also
offer a demo software download that will allow you to ex-
perience the meter and use the menu items. I found this
to be a great learning tool before reading the manual.
Bottom Line
The USA-designed GQ Electronics EMF-390 is an
EMF/ELF diagnostic tool with a built-in RF spec-
trum analyzer. It offers real-time data logging and
is capable of detecting a wide range of EMF
sources up to 10 GHz. Because it is not cali-
brated, nor does it make any claims for accuracy,
it cannot be used to assess the safety or compli-
ance of any RF source.