American Radio Relay League, Inc.
Technical Department Laboratory
225 Main St.
Newington, CT 06111
Telephone: (860) 594-0214
Internet: mtracy@arrl.org
Order From:
American Radio Relay League, Inc.
Technical Department Secretary
225 Main St.
Newington, CT 06111
Telephone: (860) 594-0278
Internet: reprints@arrl.org
Price:
$7.50 for ARRL Members, $12.50 for non-Members, postpaid.
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 1
List of Tests:
(Page numbers are omitted because the length of the report varies from unit to unit.)
Introduction
Transmitter Tests:
Transmit Output Power
Current Consumption
Transmit Frequenc y Range
Spectral Purity
Transmit Two-Tone IMD
Carrier and Sideband Suppression
CW Keying Waveform
Transmit Keyer Speed
SSB/FM Transmit Delay
Transmit/Receive Turnaround
Transmit Composite Noise
Receiver Tests:
Noise Floor (Minimum Discernible Signal)
Receive Frequency Range
AM Sensitivity
FM Sensitivity
Blocking Dynamic Range
Two-Tone, Third-Order Dynamic Range and Intercept Point
Two-Tone, Second-Order Intercept Point
In-Band Receiver IMD
FM Adjacent Channel Selectivity
FM Two-Tone, Third-Order IMD Dynamic Range
Image Rejection
IF Rejection
Audio Output Power
IF + Audio Frequency Response
Squelch Sensitivity
S-Meter Accuracy and Linearity
In-Band Receiver IMD
Notch Filter
Audio Filter
Receiver bandpass
Follow-up Tests:
Temperature Chamber Test Description
Duty Cycle Test Description
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 2
Introduction:
This document summarizes the extensive battery of tests performed by the ARRL Laboratory for each unit that is featured in
QST "Product Review." For all tests, there is a discussion of the test and test method used in ARRL Laboratory testing. For
most tests, critical conditions are listed to enable other engineers to duplicate our methods. For some of the tests, a block
diagram of the test setup is included. The ARRL Laboratory has a document, the ARRL Laboratory Test Procedures Manual,
that explains our specific test methods in detail. This manual includes test descriptions similar to the ones in this report, block
diagrams showing the specific equipment currently in use for each test, along with all equipment settings and specific step by
step procedures used in the ARRL Laboratory. While this is not available as a regular ARRL publication, the ARRL Technical
Department Secretary can supply a copy at a cost of $20.00 for ARRL Members, $25.00 for non-Members, postpaid.
Most of the tests used in ARRL product testing are derived from recognized standards and test methods. Other tests have been
developed by the ARRL Lab. The ARRL Laboratory test equipment is calibrated annually, with traceability to National
Institute of Standards and Technology (NIST). Most of the equipment is calibrated by a contracted calibration laboratory.
Other equipment, especially the custom test fixtures, is calibrated by the ARRL Laboratory Engineers, using calibrated
equipment and standard techniques.
The units being tested are operated as specified by the equipment manufacturer. The ARRL screen room has an ac supply that
is regulated to 117 or 234 volts. If possible, the equipment under test is operated from the ac supply. Mobile and portable
equipment is operated at the voltage specified by the manufacturer, at 13.8 volts if not specified, or from a fully charged
internal battery. Equipment that can be operated from 13.8 volts (nominal) is also tested for function, output power and
frequency accuracy at the minimum specified voltage, or 11.5 volts if not specified. Units are tested at room temperature and
humidity as determined by the ARRL HVAC system. Also, units that are capable of mobile or portable operation are tested at
their rated temperature range, or at –10 to +60 degrees Celsius in a commercial temperature chamber.
ARRL Product Review testing typically represents a sample of only one unit (although we sometimes obtain an extra unit or
two for comparison purposes). This is not necessarily representative of all units of the same model number. It is not
uncommon that some parameters will vary significantly from unit to unit. The ARRL Laboratory and Product Review editor
work with manufacturers to resolve any deviation from specifications or other problems encountered in the review process.
These problems are documented in the Product Review.
Units used in Product Review testing are purchased off the shelf from major distributors. We take all necessary steps to ensure
that we do not use units that have been specially selected by the manufacturer. When the review is complete, the unit is offered
for sale in an open mail bid, announced regularly in QST .
Related ARRL Publications and Products:
The 1999 ARRL Handbook for Radio Amateurs has a chapter on test equipment and measurements. The book is available for
$32.00 plus $6 shipping and handling. The Handbook is also now available in a convenient, easy to use CD-ROM format. In
addition to the complete Handbook text and graphics, the CD-ROM includes a search engine, audio clips, zooming controls,
bookmarks and clipboard support. The cost is $49.95 plus $4.00 shipping and handling. You can order both versions of the
Handbook from our web p age at http://www.arrl.org, or contact t he ARRL Publications Sales Department at 888-277-289 (toll
free). It is also widely stocked by radio and electronic dealers and a few large bookstores.
The ARRL Technical Information Service has prepared an information package that discusses Product Review testing and the
features of various types of equipment. Request the "What is the Best Rig To Buy" package from the ARRL Technical
Department Secretary. The cost is $2.00 for ARRL Members, $4.00 for non-Members, postpaid.
Many QST "Product Reviews" have been reprinted in three ARRL publications: The ARRL Radio Buyers Sourcebook (order
#3452) covers selected Product Reviews from 1970 to 1990. The cost is $15.00 plus $4.00 shipping and handling. The ARRLRadio Buyers Sourcebook Volume II (order #4211) contains reprints of all of the Product Reviews from 1991 and 1992. The
cost is $15.00 plus $4.00 shipping and handling. The VHF/UHF Radio Buyer’s Sourcebook (order #6184) contains nearly 100
reviews of transceivers, antennas, amplifiers and accessories for VHF and above. You can order these books from our Web
page or contact the ARRL Publications Sales Department to order a copy.
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 3
QST is also available on CD ROM! The ARRL Periodicals CD ROMs (1998, order #7377; 1997, order #6729; 1996, order
#6109 and 1995, order #5579) each contain a complete copy of all articles from a year’s worth of QST, the National ContestJournal and QEX (ARRL's experimenter's magazine). Each CD is available for $19.95 plus $4.00 for shipping and handling.
Contact the ARRL Publications Sales Department to order a copy.
Older issues of QST are also available: QST View CD-ROMs come in sets covering either five years each (1960-1964 through1990-1994), ten years each (1930-1939, 1940-1949 and 1950-59) or more (1915-1929). The price for each set is $39.95.
Shipping and handling for all ARRL CD ROM products is $4.00 for the first one ordered, $1.00 for each additional set ordered
at the same time.
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 4
Transmitter Output Power:
Test description:
One of the first things an amateur wants to know about a transmitter or transceiver is its RF output power.
The ARRL Lab measures the CW output power for every band on which a transmitter can operate. The unit is tested across the
entire amateur band and the worst-case number for each band is reported. The equipment is also tested on one or more bands
for any other mode of operation for which the transmitter is capable. Typically, the most popular band of operation for each
mode is selected. Thus, on an HF transmitter, the SSB tests are done on 75 meters for lower sideband, 20 meters for upper
sideband, and AM tests are done on 75 meters, FM tests are done on 10 meters, etc. This test also compares the accuracy of the
unit's internal output-power metering against the ARRL Laboratory's calibrated test equipment.
The purpose of the Transmitter Output-Power Test is to measure the dc current consumption at the manufacturer's specified
dc-supply voltage, if applicable, an d th e RF ou tpu t power of the unit under test across each ban d in each of its av ailable modes. A
two-tone audio input, at a level with in th e manufacturer's microphone-input specifications, is u s ed for the SSB m ode. No
modulation is used in the AM and FM modes.
Many transmitters are de-rated from maximum output power on full-carrier AM and FM modes. In most cases, a 100-watt
CW/SSB transmitter may be rated at 25 watts carrier power on AM. The radio may actually deliver 100 watts PEP in AM or
FM but is not specified to deliver that power level for any period of time. In these cases, the published test-result table will list
the AM or FM power as being "as specified."
In almost all cases, the linearity of a transmitter decreases as output power increases. A transmitter rated at 100 watts PEP on
single sideband may actually be able to deliver more power, but as the power is increased beyond the rated RF output power,
adjacent channel splatter (IMD) usually increases dramatically. If the ARRL Lab determines that a transmitter is capable of
delivering its rated PEP SSB output, the test-result table lists the power as being "as specified."
Key Test Conditions:
Termination: 50 ohms resistive, or as specified by the manufacturer.
Block Diagram:
PTT S
ELEGRAPH KEY
T
TWO-T
UDIO
A
ENERATOR
G
WITCH
OWER
P
UPPLY
S
ONE
AC ONLY
T
DC ONLY
DUT
RANSMITTER
100 W
T
YPICAL
ATTS
CAUTION!: Power must only be applied to the
attenuator input! Do not reverse input and output
terminals of the Bird 8329.
1. Unit's power meter consists of LED segments; minimum power showed 0 segments lit.
2. The unit showed LED segments reaching a fixed display label reading 100 at full power.
3. Due to a problem with this unit, AM carrier power could not be measured in a meaningful way. See text of
QST’s Product Review for details.
4. Initial power output upon applying power after “soaking” at -10 deg for an hour. After each subsequent
transmission, the power output increased with rise in rig’s internal temperature (three very short
transmissions brought the output up to about 50W).
10. Temperature chamber test at -10 degrees Celsius.
11. Temperature chamber test at +60 degrees Celsius.
12. Output power test at 11.5 volts dc power supply (if applicable).
99. Temperature chamber tests and 11.5 volt tests are performed only for portable and mobile equipment.
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 6
Current Consumption Test: (DC-powered units only)
Test Description:
important for QRP rigs, the ARRL Lab tests the current consumption of all equipment that can be operated from a battery or
12-14 Vdc source. The equipment is tested in transmit at maximum output power. On receive, it is tested at maximum
volume, with no input signal, using the receiver's broadband noise. Any display lights are turned on to maximum brightness, if
applicable. This test is not performed on equipment that can be powered only from the ac mains.
Current Consumption:
VoltageTransmit
13.8 V17 A97.0 W1.3 AON
Current consumption can be a important to the success of mobile and portable operation. While it is most
Output PowerReceive CurrentLights?Notes
Current
Transmit Frequency Range Test:
Test Description:
operation, for example, or unintentionally as the result of the design and internal software. The ARRL Lab tests the transmit
frequency range inside the screen room. The purpose of the Transmit Frequency R an ge Test is to determine th e range of
frequencies, including those outside amateur bands, for w hich th e transmitter may be used. The key test conditions are to test it at
rated power, using nominal supply voltages. Frequencies are as indicated on the transmitter frequency indicator or display.
Most modern synthesized transmitters are capable of operation outside the ham bands. However, spectral purity is not always
legal outside the hams bands, so caution must be used. In addition, most other radio services require that transmitting
equipment be type accepted for that service. Amateur equipment is not legal for use on other than amateur and MARS
frequencies.
Copyright 1999, American Radio Relay League, Inc. All Rights Reserved.
Page 7
CW Transmit Frequency Accuracy Test:
Test Description:
equipment operating within a few Hz of the frequency indicated on the frequency display. However, some units, notably
"analog" units, not using a phase-lock loop in the VFO design, can be off by a considerable amount. This test measures the
output frequency. Unit is operated into a 50-ohm resistive load at nominal temperature and supply voltage. Frequency is also
measured at minimum output power, low supply voltage (12 volt units only) and over the operating temperature range (mobile
and portable units only). Non-portable equipment is not tested in the temperature chamber.
Test Results:
Unit FrequencySupply
14.000 00 MHz13.8 V25 C14.000 011 MHz
14.000 00 MHz12.5 V25C14.000 011 MHz
14.000 00 MHz13.8 V-10C13.999 949 MHz
14.000 00 MHz13.8 V+60C14.000 043 MHz
50.000 00 MHz13.8 V25 C50.000 037 MHz
144.000 00 MHz13.8 V25 C144.000 106 MHz
430.000 00 MHz13.8 V25 C430.000 315 MHz
430.000 00 MHz13.8 V-10C429.998 297 MHz
430.000 00 MHz13.8 V+60C430.001 271 MHz
Most modern amateur equipment is surprisingly accurate in frequency. It is not uncommon to find
Voltage
TemperatureMeasured Frequency
Full Output Power
Notes
Spectral Purity Test:
Test Description:
known as spurious emissions or "spurs." Part 97 of the FCC rules and regulations specify the amount of spurious emissions that
can be emitted by a transmitter operating in the Amateur Radio Service. The ARRL Laboratory uses a spectrum analyzer to
measure the spurious emission on each band on which a transmitter can operate. The transmitter is tested across the band and
the worst-case spectral purity on each band is captured from the spectrum analyzer and stored on disk. Spectral purity is
reported in dBc, meaning dB relative to the transmitted carrier.
The graphs and tables indicate the relative level of any spurious emissions from the transmitter. The lower that level, expressed
in dB relative to the output carrier, the better the transmitter is. So a transmitter whose spurious emissions are -60 dBc is
spectrally cleaner than is one whose spurious emissions are -30 dBc. FCC Part 97 regulations governing spectral purity are
contained in 97.307 of the FCC rules. Information about all amateur rules and regulations is found in the ARRL FCC RuleBook. Additional information about the decibel is found in the ARRL Handbook.
Key Test Conditions:
Unit is operated at nominal supply voltage and temperature.
Output power is adjusted to full power on each amateur band.
A second measurement is taken at minimum power to ensure that the spectral output is still legal at low power.
The level to the spectrum analyzer is –10 dBm maximum.
The resolution bandwidth of the spectrum analyzer is 10 kHz on HF, 100 kHz on VHF, 1 MHz on UHF.
All transmitters emit some signals outside their assigned frequency or frequency range. These signals are