1、- EIA 424 75 3234600 0068443 7 .-* EIA STANDARD d cy d tx 4 in I Y Minimum Standards - Citizens Radio Service SSB Transceivers Operating in the 27 MIHz Band RS-424 February 1975 Engineering Department ELECTRONIC I NDUSTRIES ASSOCIATION Copyright Telecommunications Industry Association Provided by IH
2、S under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA 424 75 3234b00 0068442 9 . NOTICE EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and purchasers, facilitat
3、ing interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of sych standards shall not in any respect preclude any member or non-member of EIA from manufacturing or selling prod
4、ucts not conforming to such standards. Recommended standards adopted by EIA are without any regard to whether or not their adop tion may in any way involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obli
5、gation whatever to parties adopting the recommended standards. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W., Washington, D. C, 20006 Q Electronic Industries Association 1975 All ribthta reserved Piice $4.25 Printed in U.S.A. I. Copyright Telecommunicati
6、ons Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MINIMUM STANDARDS . CITIZENS IRADIO SERVICE SSB TRANSCEIVERS OPERATING IN THE 27 MHz BAND (From EIA Standards Proposal No . 11 59-A formdated under the co
7、gnizance of EIA Committee TR-32 on Citizens Radio Equipment) TABLE OF CONTENTS 1 . SCOPE . 1 2 . STANDARD TEST CONDITIONS P 3 . POWER SUPPLY VOLTAGE RANGE . 3 Minimum Standards-Receiver 4 . SENSITIVITY . 3 5 . AUTOMATIC GAIN CONTROL . 4 6 . AUDIO SQUELCH THRESHOLD LEVEL . 5 7 . ADJACENT SIDEBAND REJ
8、ECTION . 5 8 . SPURIOUS RESPONSE ATTENUATION 6 9 . CROSS-MODULATION REJECTION 7 PO . RF INTERMODULATION REJECTION 7 11 . RECEIVER AUDIO OUTPUT POWER 8 12 . SPEECH CLARIFIER TEST 8 13 . RECEIVER AUDIO FREQUENCY RESPONSE 9 14 . IMPULSE NOISE LIMITER/BLANKER PERFORMANCE 9 15- RECEIVER SPURIOUS OUTPUT E
9、MISSIONS . 10 . -1- . = Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- EIA 424 75 W 3234b00 0068444 2 W Minimum Standards-Transmitter 16. TRANSMITTER PEP POWER OUlPUT. . 11 17
10、. TRANSMITTER CONDUCTED SPURIOUS EMISSIONS . 12 18. TRANSMITTER RADIATED SPURIOUS EMISSIONS. 13 19. TRANSMITTER AUDIO FREQUENCY RESPONSE .15 20. TRANSMITTER FREQUENCY STABILITY. 15 Minimum Standards-Environmentai 21. TEMPERATURE RANGE. 16 17 22. HIGH HUMIDITY 23. VIBRATION STABILITY. 18 24. SHOCKSTA
11、BILITY 18 . . -11- I. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L- EIA 424 75 3234600 00bli45 4 = RS-424 Page 1 MINIMUM STANDARDS - CITIZENS RADIO SERVICE SSB TRANSCEIVERS
12、 OPERATING IN THE 27 MHz BAND 1. SCOPE This Standard details definitions and methods of measurement of characteristics of SSB transmitters and receivers or SSB/AM transmitters and receivers, operating in the SSB mode, intended for opera- tion in the Class “D” Citizens Radio Service as defined in Par
13、t 95 of the FCC Rules and Regulations. The minimum standards herein apply to both upper and lower sideband modes of operation when they are provided and to all channel settings included in the equipment and over the range of carrier frequencies specified in 95.41 (d) of the FCC Rules and Regulations
14、. This Standard is intended to promote the compatibility of these transmitters and receivers with the systems in which they will operate. 2. STANDARD TEST CONDITIONS 2.1 Definition Standard test conditions are those conditions which shall apply to a transceiver while it isbeing tested for minimum re
15、quirements. These conditions shall apply unless otherwise specified. 2.2 Specific Standard Test Conditions 2.2.1 Power Supply Test Voltage is the primary voltage applied to the input of the power cable normally supplied with the equipment during all tests unless otherwise specified. Standard Test Vo
16、ltage shall be as follows: Nominal Power Supply Voltage 6 VDC 12 VDC 24 VDC 32 VDC 64 VDC 110 VDC 110 /i20 VDC 208 VDC 240 VDC Test Voltage 2.2.2 Standard Temperatures and Humidity shail be as followsl 25 C k 5O C and 90% maximum relative humidity. 6.6 Volts 13.8 Volts 26.4 Volts 36 Volts 72 Volts 1
17、10 Volts 121 Volts 211 Volts 242 Volts Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RS-424 EIA 424 75 3234600 00b844b b = Page 2 2.2.3 Standard Transmitter Output Load shall
18、consist of a 50 ohm resistive termination. Standard Loading Conditions for the RF output circuits shall be those specified by the manufacture in the literature normally furnished with the transceiver. 2.2.4 Automatic Level Control. The automatic level control (ALC) shall be operative for all tests o
19、f transmitter cerformance. 2.2.5 Standard Input Signal Source shall consist of a calibrated signal generator whose internal plus external resistance is 50 ohms, the voltage to be measured across terminals A and B, when A and B are terminated in a 50 ohm resistive load. Ge ne ru tor Re ce i ver R, -+
20、 Rext = 50 Ohms 2.2.6 Standard Audio Beat Note. For receiver tests, unless otherwise specified, the CW standard input signal source shall be adjusted to produce an audio beat note of 1000 Hz ? 100 Hz. 2.2.7 Standard Audio Output Load for Receiver Tests shall consist of a resistive load equal to the
21、nominal output load specified by the manufacturer. 2.2.8 Standard Receiver Conditions. The receiver squelch control shall be unsquelched to its maximum extent unless otherwise specified, the noise blanker disabled and the RF gain control at full gain. 2.2.9 Associated Equipment. The standard associa
22、ted equipment to be used with the trans- ceiver during these tests is that with which it normally operates. 2.3 Method of Measurement 2.3.1 Mobile Equipment. .The cables normally supplied with the equipment should be full length and connected in the usual manner as specified by the manufacturer. 3.3
23、.2 Base Equiprtient. The primary voltage shall be measured at the power source to the equipment. 9 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA 424 75 m 323qbOO 0068447 B
24、 m RS-424 Page 3 3. POWER SUPPLY VOLTAGE RANGE 3. Z Definition The Power Supply Voltage Range is the range of primary voltage over which the transceiver wiil operate with a specific performance. 3.2 Minimum Standards 3.2.1 Over a voltage range equal to the standard test voltage f lo%, the following
25、degradation limits shall not be exceeded: 3.2. I. 1 Transmitter Power Output 2 dB 3.2.1.2 Receiver Audio Output Power 2 dB 3.2.1,3 Sensitivity 2 ClB 3.2.1.8 Audio Squelch Low Threshold Level 2 dB 3.2.1.5 Tight Squelch shall not lock out signals stronger than 500 volts. 3.2.2 The Transmitter Frequenc
26、y Stability shall be maintained over a range of plus or minus 15% of standard test voltage. 3.2.3 Over a voltage range equal to the standard test voltage minus 20%, the equipment shall start and operate and the transmitter power output shall not drop more than 3 dB, nor shall the receiver sensitivit
27、y degrade more than 3 dB below the measured values at standard test conditions. 3.2.4 At a primary voltage of up to 15% above the standard test voltage, no short term failures shall occur although the life of the components may be reduced. MINIMUM STANDARDS - RECEIVER 4. SENSITIVITY 4.1 Definition T
28、he Sensitivity of the receiver section is the minimum value of a CW input sipal at a frequency that produces the standard audio beat note that will produce a 10 dB signal plus noise to noise (S + N)/N ratio. 1 I Copyright Telecommunications Industry Association Provided by IHS under license with EIA
29、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA 424 75 M 3234b00 00b844B T M RS-424 Page 4 4.2 Method of Measurement A standard input signal source shall be connected to the receiver antenna input terminals and the frequency adjusted to produce the standard aud
30、io beat note. A standard audio output load and voltmeter shall be connected to the audio output terminals. The volume control shall be adjusted for an audio output level approximately 6 dB below the rated audio output power. The standard input signal source attenuator shall be adjusted until the rat
31、io of audio output level with input signal to the audio output level without input signal is 10 dB. 4.3 Minimum Standards 4.3.1 For mobile or base equipment, the minimum Sensitivity shall be 0.5 microvolt. 4.3.2 For handheld, personal type equipment, the minimum Sensitivity shall be 1.0 microvolt. 5
32、. AUTOMATIC GAIN CONTROL 5.1 Defini tion The Automatic Gain Control performance of the transceiver is the measure of the ability of the unit to maintain a constant audio output level with varying input signal and the degree to which the re- ceiver prevents intermodulation distortion of the SSB signa
33、l with strong input signal levels. 5.2 Method of Measurement 5.2.1 Static Compression Characteristics. A standard input signal source shall be connected to the receiver antenna input terminals and the frequency adjusted for the standard audio beat note. A standard audio output load and voltmeter sha
34、ll be connected to the audio output terminals. The standard signal input signal source shall be adjusted to a level of 50,000 microvolts and the audio output level set to approximately 6 dB below the rated audio output power. The input level shall be varied from 50,000 microvolts to the rated 10 dB
35、(S + N)/N level and a plot of audio output level versus input level shall be prepared. 5.2.2 AGC Intermodulation Distortion. Using a spectrum analyzer, sample the intermediate frequency signal just after the last stage employing AGC. Through a 10 dB “T” pad apply two equal amplitude CW signals, the
36、first of which produces a 1000 Hz beat note and the second of which produces a 1600 Hz beat note. Adjust the input signal level of each signal generator to 158,000 microvolts (10 dB greater than 50,000 microvolts). Observe and plot the attenuation of the third order intermodulation distortion produc
37、ts (relative to either of the desired signals) versus the input signal level over the input level from 50,000 microvolts per signal to the rated input level per signal for a 10 dB (S + N)/N ratio. The AGC intermodulation distortion figure of merit is the attenuation of the least attenuated 3rd order
38、 distortion product level expressed in dB, taken from the graph. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA 424 75 m 3234600 0068449 IJ m RS-424 Page 5 5.3 Minimum Stan
39、dards 5.3.1 Minimum Standard, Static Characteristics. The output versus input curve shall be free from sharp discontinuities. The ratio of maximum audio output level to mini- mum audio output expressed in dB shall be the measure of AGC compression perform- ance. The maximum shall be 16 dB. 5.3.2 Min
40、imum Standard, AGC Intermodulation Distortion. The AGC intermodulation distortion figure of merit shall be greater than or equal to 20 dB. 6. AUDIO SQUELCH THRESHOLD LEVEL 6.1 Definition The Audio Squelch Threshold Level of a transceiver is the minimum value of a CW standard input signal source leve
41、l which, when adjusted to produce the standard audio beat note, will open the receiver squelch. 6.2 Method of Measurement 6.2.1 Low Threshold. A CW standard input signal source shall be connected to the receiver antenna input terminals and adjusted to produce the standard audio beat note. A standard
42、 audio output load and voltmeter shall be connected to the audio output terminals of the receiver. With the input signal source adjusted 1 microvolt, the volume control shall be adjusted for an audio output level approximately 6 dB below the rated audio output power. With no RF signal inpii t to the
43、 receiver, the squelch control shall be adjusted to quiet the thermal noise a minimiim of 20 dB over a ? 10% power supply VoltGe range. With the power supply voltage djusted for standard test conditions, the RF level of the input signal source shall be adjusted until the receiver produces continuous
44、 audio output not less than 10 dB below rated audio output. The minimum input signal level required to produce this condition is defined as the squelch low threshold level. 6.2.2 Tight Threshold. After measuring the low threshold level, the receiver shall be measured for tight threshold level. The R
45、F signal required to produce continuous audio output at the audio output reference level with the squelch control in its tightest position (usually one end of its mechanical range) is defined as the tight threshold level. 6.3 Minimum Standards The Audio Squelch Low Threshold Level shall be no greate
46、r than 0.5 microvolt and the tight threshold shall be no greater than 500 microvolts nor less than 30 microvolts. 7. ADJACENT SIDEBAND REJECTION ” 7.1 Definition Adjacent Sideband Rejection is the level to which the receiver intermediate frequency filter is able to suppress signals falling in the re
47、gionof theopposite sideband. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA 424 75 = 3234600 00b8450 8 KS-424 Page 6 7.2 Method of Measurement After coupling a signal gener
48、ator to the receiver antenna input terminals, adjust the frequency to produce the standard audio beat note. Attach a standard audio output load and voltmeter to the audio output terminals. Adjust the input signal level for an (S + N)/N ratio of 10 dB. Set the volume control for an audio output level
49、 at the rated audio output power minus 6 dB. If the unit under test is capable of receiving both USB and LSB, change to the opposite mode. If the unit has only one sideband reception mode, use a frequency counter to shift the input signal 1000 Hz f 100 Hz to the opposite side of the suppressed carrier frequency. Increase the signal generator level until the audio output reaches the reference level. The amount of increase, ex- p
