Posted on January 19, 2016
Radio Standards Specification RSS-117, Issue 3, Licensed Transmitters Operating in the Band 200-535 kHz, sets out the technical requirements for the compliance of radio apparatus operating in the frequency band 200 kHz to 535 kHz.
This document will come into force upon publication on the Innovation, Science and Economic Development’s website (www.ic.gc.ca/spectrum).
List of Changes:
- Modernized to reflect the current RSS structure since its last publication in 1974.
- Emission designators have been updated.
- Editorial modifications and corrections have been made throughout.
Issued under the authority of
the Minister of Innovation, Science and Economic Development
Engineering, Planning and Standards Branch
- Measurement Requirements and Methods
- Technical Requirements and Limits
This Radio Standards Specification (RSS), Land and Coast Station Transmitters Operating in the Band 200-535 kHz, sets out the requirements for the technical compliance of licensed Category I transmitters operating in the frequency band 200 kHz to 535 kHz.
Land and coast station transmitters are licensed Category I radio apparatus operating in the frequency band 200 kHz to 535 kHz. Land stations transmitters are those stations, other than mobile stations, used for radiocommunication with mobile stations. Coast station transmitters consist of land stations used in the maritime mobile service.
The transmitters operate as per the following emission designators:
The radio equipment covered by this standard is subject to licensing, pursuant to subsection 4(1) of the Radiocommunication Act.
In addition to RSS-117, the requirements in RSS-Gen, General Requirements for Compliance of Radio Apparatus, must be met.
The requirements in RSS-102, Radiofrequency (RF) Exposure Compliance of Radiocommunication Apparatus (All Frequency Bands), must be met.
A test report shall be compiled, providing a record of the tests and results demonstrating compliance with the technical requirements in this standard and with RSS-Gen. The test report shall include the transmitter’s category.
These transmitters are divided into the following equipment categories, based on their temperature extremes design.
|Equipment Category||Temperature Extremes|
|A||– 40°C to 55°C|
|B||– 10°C to 55°C|
|C||0°C to 55°C|
All Spectrum Management and Telecommunications publications are available on Department of Innovation, Science and Economic Development’s website at http://www.ic.gc.ca/spectrum under Official Publications.
In addition to the related documents specified in RSS-GEN, General Requirements for Compliance of Radio Apparatus, the following departmental documents should be consulted:
- RIC-66, Addresses and Telephone Numbers of Regional and District Offices of the Department of Innovation, Science and Economic Development
- RSP-100, Certification of Radio Apparatus
- TRC-43, Designation of Emissions, Class of Station and Nature of Service
Unless stated otherwise, the conditions of this section shall be applied for the measurements.
The test voltage shall be the voltage applied to the power input terminals of the equipment. It shall be within ± 2% of the value stated by the manufacturer to be the working voltage.
The temperature applied during the tests shall be 25°C ± 5°C.
All tests shall be made on at least two carrier frequencies, one near the high end and one near the low end of the frequency range.
The output termination shall be a nominal 50 ohm resistive load or as stated by the manufacturer.
3.1.5 Standard Test Modulation
The transmitter shall be operated at the manufacturer’s rated power and tested in accordance with the measurement method described in RSS-Gen with signals modulated as follows:
- If the audio input signal is voice and the transmitter is FM, the transmitter shall be modulated with a 2.5 kHz tone at a level 16 dB higher than that required to produce 50% of the maximum frequency deviation.
- For all other transmitters, a signal representative (i.e., typical) of those encountered in a real system operation shall be used. If the transmission is not continuous, this must be indicated in the test report.
The following test modulation shall be applied as per the emission type of the transmitter.
For A1A transmitters, the test modulation shall consist of a valid string of Morse code characters.
For A2D and A3E transmitters, the test signal shall be a 1 kHz tone at a level that produces a 50% modulation level.
18.104.22.168 H2D / H3E Transmitters
For H2D and H3E transmitters, the test modulation shall consist of applying a two-frequency test signal in accordance with the following paragraphs, as applicable.
- Conventional H2D / H3E Transmitters: The two-frequency test signal shall consist of the carrier and a sinusoidal audio frequency signal of 2 000 Hz. The audio signal shall be applied to the audio input terminals of the transmitter. The carrier and audio signals shall be adjusted to produce two equal amplitude RF signals at the output of the transmitter.
- Special H2D Beacon Transmitters: These are transmitters in which the H2D mode is generated by two RF oscillators. One oscillator shall operate at the carrier frequency ("carrier oscillator") and the other ("sideband oscillator") shall operate at 1 020 Hz or 400 Hz (±5%) above the carrier. The operating level of these two oscillators shall be adjusted to produce two equal amplitude RF signals at the output of the transmitter. For test purposes, the "sideband oscillator" shall not be keyed.
3.1.6 Rated Duty Cycle
The transmitters shall be operated (carrier "on") under one or more of the following duty cycles as specified by the manufacturer:
- Continuous: The transmitter shall be operated continuously for 24 hours. This rating is limited to transmitters capable of continuous operation.
- Semi-continuous: The transmitter shall be operated continuously for eight hours.
- Intermittent: The transmitter shall be operated under a cycle of one minute carrier “on” and four minutes carrier “off” for a period of eight hours, followed by three test cycles of five minutes “on”, 15 minutes “off”.
Measure and record the transmitter output power using a measurement (resolution) bandwidth at least two to three times the width of the occupied bandwidth for transmitters equipped with masks D and E to capture the true peak emission of the equipment under test. For transmitters equipped with other masks, a measurement bandwidth wider than the occupied bandwidth of the transmitter shall be used.
The transmitter shall be operated unmodulated at the rated duty cycle (Section 3.1.6) and loaded into the output termination. The average RF power output shall be measured and recorded for the duration of the test. All details of the measurement shall be clearly described in the test report.
The transmit power shall be measured in average value (PMEAN) as a conducted emission over any period of continuous transmission.
The transmitter shall be operated in the H2D / H3E mode at the rated duty cycle (Section 3.1.6) with the test modulation (Section 22.214.171.124) applied. A sample of the RF power output shall be fed to a spectrum analyzer and the output level of the two-frequency signal shall be adjusted, so that the output spectrum of the transmitter conforms to the limits of Table 4. No adjustments shall be made to the transmitter after the initial set-up. The average RF power output (Pavg) shall be measured and recorded for the duration of the test. Peak envelope power, PEP = 2 × Pavg. All details of the measurement shall be clearly described in the test report.
The transmitter’s unwanted emissions shall be measured as per the requirements of this section.
The transmitter shall be operated into the output termination under the standard modulation test conditions (see Section 3.1.5), except that:
- in the case of A2A / A2D / A3E transmitters, the modulating frequency shall be 2000 Hz and the modulation shall be adjusted to 95%; and
- in the case of H2D / H3E transmitters, the carrier level shall be adjusted to that obtained at rated PEP in Section 4.2 and the side band signal level shall be adjusted to the carrier level.
A sample of the RF output shall be fed to a spectrum analyzer or equivalent instrument. The level and frequencies of each significant output component with reference to the level of the unmodulated carrier shall be measured and plotted (see Table 4) over a band of frequencies equal to ± 250% of the necessary bandwidth. A resolution bandwidth of 100 Hz shall be used.
On any frequency removed from the carrier frequency by more than 250% of the necessary bandwidth, a resolution bandwidth of at least 10 kHz shall be used for frequencies to be measured below 30 MHz and a resolution bandwidth of at least 100 kHz shall be used for frequencies to be measured at or above 30 MHz. If a narrower resolution bandwidth is used, power integration shall be applied.
The maximum allowable tolerances on voltage, temperature and humidity measurements shall be as follows:
For the purpose of these tests, equipment temperatures shall be considered stabilized when the temperature of the largest internal mass remains within ± 3°C of the specified value when the equipment is inoperative, or when the crest temperature of the largest internal mass does not vary by more than ± 5°C with equipment operating.
The equipment shall be placed in a test chamber inoperative until the equipment temperature is stabilized at 25°C. At the end of this period, and allowing up to one hour for warm up, the transmitter shall be placed in operation under standard test conditions, under the appropriate duty cycle with modulation (1 020 Hz tone or "side band oscillator") switched off. The frequency shall then be measured and recorded at one-minute intervals for a period of 15 minutes and the average frequency computed. The average frequency shall be the standard test frequency.
The temperature and voltage shall be varied throughout the entire environmental range as specified in Table 1, along with a voltage variation of ±10% of the standard test voltage. Performance measurements shall be made at the temperature extremes using standard supply voltage ±10% and at each significant temperature throughout the applicable range listed in Table 1. Allow the equipment under test to stabilize at each temperature where measurements are to be made.
Frequency measurements shall be made at one-minute intervals for a five-minute period and recorded. The RF power output shall be measured and recorded at regular intervals.
The equipment under test (EUT) shall be placed inoperative in a test chamber at a relative humidity in excess of 95% and ambient temperature of 40°C for a period of eight hours. After this time, the equipment shall be taken from the chamber and any condensed moisture may be drained off. Immediately after the removal of the EUT from the chamber, primary power shall be applied to the EUT. No more than 15 minutes shall be allowed for the EUT to warm up.
Immediately after this warm up period, frequency measurements shall be made at one-minute intervals for a five-minute period, and the RF power output shall be measured. All measurements shall be recorded.
For the purposes of this specification, values of necessary bandwidth corresponding to various types of emission shall be as shown in the following table:
|Type of Emission||Necessary Bandwidth|
|A1A||2 x Highest tone used|
|A2D||2 x Highest tone used|
|A3E||6 000 Hz|
|H2D||Highest tone used|
|H3E||3 000 Hz|
The output power shall be within ±1 dB of the manufacturer’s rated power listed in the equipment specifications which comply with the limits in Section 3.2. For H2D / H3E, the RF power rating shall be in terms of PEP.
In the case of single side band (SSB) transmitters the maximum output of the transmitter shall be automatically limited to a level not in excess of 1 dB above the manufacturer’s rated PEP. Limiting action shall be accomplished in such a manner that when operating in the H3E mode, the carrier is not reduced below -6 dB relative to PEP.
Transmitters used as radio beacons shall have an output modulated at 1 020 Hz or 400 Hz as specified by the manufacturer. The tolerance on these tones shall be ± 5%.
Under the test described in the preceding Section 3.3.2, the land and coast stations’ transmitter unwanted emissions shall be attenuated below the unmodulated carrier by the levels presented in the following table. The frequency displacement is expressed in terms of percentage of the necessary bandwidth.
|Frequency displacement, fd, (% of necessary bandwidth)||Attenuation (dB) below the unmodulated carrier|
|50% ≤ fd ≤ 150%||26 dB|
|150% ≤ fd ≤ 250%||32 dB|
|250 % < fd||40 dB or 25 mW (whichever is more stringent)|
The maximum departure, under any environmental condition, of the measured frequency from the standard test frequency shall not exceed 0.01%.
The transmitter RF power output under any environmental condition shall not degrade more than 3 dB below the power output rating obtained under standard test condition.