1、MIL-U-29358 58 = 7979706 OL56bOL T r“ Q 3 Li* 5 . r- MIL-M-29358(MC) 10 June 1976 MILITARY SPEC IF ICAT ION MODIFICATION KIT: RADIO RELAY EQUIPMENT AN/GRC-201 This Specification is approved for use by all Departments and Agencies of the Department of Defense, 1. SCOPE. 1.1 This specification covers
2、the requirements for one type modifica- tion kit to be installed in the AN/TRC-97C Radio Set to provide low noise receiver performance, universal power utilization, and pulse-code modulation/time division multiplex (pcm/tdm). When this kit is installed, the AN/TRC-97C Radio Set will be identified as
3、 the AN/GRC-201 Radio Cet. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal form a part of the specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-P-15024 MIL-E-16400 MIL-E-17555 MIL-E-21981 MIL-R-
4、28704 STANDARDS MILITARY MIL-STD - 105 MIL-STD-129 - Plate, Tags and Bands For - Electronic Interior Communication Identification of Equipment. and Navigation Equipment, Naval Ship and Shore, General specification. - Electronic and Electrical Equipment, Accessories, and Repair Parts; Packaging and P
5、acking of. Identification Plates and Markings, Requirements For. - Radio Relay Equipment, Transhorizon (Tropospheric Scatter) AN/TRC-97 - Electronics Type Designations, - Sampling Procedures and Tables for - Marking for Shipment and Storage. Inspection by Attributes THIS DOCUMENT CONTAINS IL PAGES.
6、FSC 5820 A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-27356 58 9979706 0356603 3 (cl High strength-to-weight ratio structural materials shall
7、 be utilized in construction to minimize weight. the severe environmental requirements specified herein without deteriora- tion. Protective coatings and finishes shaL1 be utilized in materials subject to deterioration. Materials shall withstand 3.3 -Design and construction. The kit shall be designed
8、 and constructed so that khen it has been installed, the AN/GRC-201 Radio Set will conform to the requirements specified herein. The radio set shall be readiiy transportable and capable of providing two-way multichannel communication. While the primary purpose of the radio set is to utilize the trop
9、ospheric scatter mode of operation, it shall also be capable of transmitting and receiving in the line-of-sight mode. The baseband intermediate frequency and radio frequency parts shall be designed so that the bandwidth capa- bility may be extended up to 24 channels of pcm/tdm by the use of bandpass
10、 plug-in filters or other suitable, replaceable assemblies in accordance with MIL-E-16400. The primary requirements of this kit are that it shall be reliable, maintainable, and suitable for operation and maintenance to the current levels of the AN/TRC-97C Radio Set, 3.3.1 Power sources. The radio se
11、t shall be designed to operate and maintain performance specified herein from power sources having the following characteristics: (a) Potential (steady state): 120/208 volts (VI 2 10 percent (b) Phase: 3-phase, 4-wire, wye (cl Fluctuation in potential: - + 2 percent (d) Rate of change of voltage: 2.
12、5 percent per second (e) Frequency (steady state): 50, 60, or 400 hertz (Hz) - + 5 percent (f) Fluctuation in frequency: - + 1 percent (g) Rate of change of frequency: 2.5 percent per second 3.3.2 Electrical supply variations. The radio set shall not be required to deliver performance specified here
13、in during periods where electrical power source varies from specific steady sfate value by more than the tolerance value when used with a power generating source provided solely for power supply for the radio set. Operation of the radio set, though degraded, shall still be possible with voltage vari
14、ations of up to 230 percent and frequency variations of 215 percent. The radio set shall not sustain damage or alteration of characteristics when such variations are experienced in the power source for periods of 10 seconds with a frequency of one every 5 minutes, 0 In the event of Provided by IHSNo
15、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-27358 5 777770b 035b604 5 variations in excess of +30 percent in voltage or 215 percent in frequency, or complete power source failure, the radio set shall “fail safe.“ 3.3.3 Power consumption. Under normal operat
16、ing conditions, the radio set shall require not more than 7.5 kilowatts of 0.8 power factor primary power, 3.3.4 Pulse-code modulation channel capacity. The 12-channel pcm/tdm radio set shall provide facilities for 1,152,000 bits per second (b/s) pcm/tdm signals in a format identical to that used by
17、 the TD-660A/G Multiplexer, TD-206 Restorers, and the TD-204 Cable Combiner. The radio set shall regenerate the pcm signals but not convert pcm signals to audio or vice versa, An independent orderwire (ow) or service channel of 300 to 3400 Hz shall be included. Also, direct current (dc) froin the re
18、ceive cable interface shall be looped back to the transmit cable interface to provide a closed circuit enabling the TD-204 Cable Combiner to power the TD-206 Restorers. 3.3.5 Frequency response. The frequency response shall be as follows measured at the shelter interface: OW: 700 Hz and 1300 Hz, +2.
19、0 decibels (dB) to -2.0 dB; 300, 400, and 2500 Hz, +3.0 dB to -3.0 dB; 3000 Hz, +2 dB to -10 dB, all relative to 1 kilohertz (kHz). pcm/tdm: 2,304,000 b/s (cable system) 3.3.6 Pulse code modulation input. The pcm input of the exciter shall be compatible with the output of the pcm digital data modem.
20、 An ow or service channel circuit shall be incorporated whose input shall be independent of that provided by the pcm multiplexer signal and whose ringing tone is different from all other ringing tones or alarm tones in the radio set. 3.3.7 Modulating frequencies. The modulating frequencies shall be
21、as follows: ow service channel : 300 Hz to 4 kHz pcm multiplex channel: 576,000 b/s for 12 channels 1,152,000 b/s for 24 channels 3.3.8 Frequency deviation. The frequency deviation shall be as follows: OW: - + 31.1 kHz peak at -15 dB referred to 1 milliwatt (rnbJ). 4 Provided by IHSNot for ResaleNo
22、reproduction or networking permitted without license from IHS-,-,-NIL-N-29358 58 m 9979706 015bb05 7 m pcm multiplex For 12 or 24 channels, 2 375 peak for 1 V peak-to-peak input at pcm baseband. 3.3.9 Receiver. The receiver shall be a low noise receiver capable of receiving and demodulating signals
23、from either the tropospheric scatter or line-of-sight modes of operation. The receiver shall utilize a parametric amplifier-tunnel diode preamplifier with appropriate preselection to obtain a noise figure measured at the antenna terminals of 2.8 dB or better and shall not be limited by special maint
24、enance or operating features. The receiver noise figure shall automatically be 11 dB or less if the low-noise device fails (fail-safe operation). These input noise figures apply provided the input noise figure of the AN/TRC- 97C Radio Set beforemodification is 5.1 dB or less. 3.3.10 Diversity combin
25、er. The receiver shall be capable of dual diversity operation. predetection maximal ratio combiner. The dual diversity output shall be constant within 1 dB with the receiver input signals at any point within their normal range of operation. Diversity action shall be achieved by means of a 3.3.11 Ban
26、dwidth. The bandwidth shall be 1.5 kHz. 3.3.12 Receiver output. The output circuits of the receiver for the 12- or 24-channel baseband shall have the capability of feeding the pcm digital data modem a composite pcm plus ow signal. shall accept the radio sensory ow from the digital data modem at a -4
27、 dB referred to 1 mW level and transfer the signals through the ow hybrid to the receiver handset and ring facilities. to the digital data modem shall be 1 V peak-to-peak at 50 ohms. The receiver ow system The pcm baseband output signals 3.3.13 Receiver monitor. The receiver monitor shall provide a
28、means to identify the receiver(s1 which are contributing to the output of the diversity combiner. This indication shall include the operation of a local indicator and shall provide a facility for each receiver for operation of a monitor to a remote location. 3.3.14 Maximum sianal. The receiver shall
29、 operate normally and meet the intermodulation requirement with the radio set operating as a line- of-sight terminal and a like radio set as the.other terminal to a distance of 1 nautical mile. Reception of signals in excess of this level shall not affect the maximum usable signal of the receiver at
30、 any time. 3.3.15 Recorder output. A monitor circuit and output amplifier for driving a suitable recorder shall be provided for each receiver and combiner to permit monitoring the received signal level. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
31、-,-MIL-M-24358 58 m 777440b OL5bbOb 4 = 3.3.16 Metering. All critical circuits,and circuits normally used in tuning the receiver,shall be metered. 3.3.17 Output impedance. 600 ohms percent for the pcm baseband. The output impedance for the ow shall be +i0 percent, including the drop repeater,and 50
32、ohms 210 3.3.18 Output level, The output level shall be -15 dB referred to 1 mi4 for the ow and 1 V peak-to-peak for the pcm baseband. 3.3.19 Antenna group. The antenna group shall be designed to provide maximum flexibility in operating as a line-of-sight terminal antenna group and space dual divers
33、ity compatible with the AN/TRC-112 Radio Set antenna system. The reflector shall provide for orientation of the feed system at both the vertical position and 45 degrees from the vertical position. All other antenna requirements shall continue to be met. 3.3.20 Pulse-code modulation diRital data mode
34、rn (ddm). The ddm provides for transmission of 12 or 24 audio channels using pcm signals in a format identical to that used by the TD-660 Multiplexer and the TD-204 ( )/G Cable Combiner. convert the pcm signals to audio or vice versa. the radio transmitter and receiver into the special purpose elect
35、rical CX-11230 Cable Assembly. TD-206 ( )/G Restorers placed at 1/4-mile intervals in the cable system with the TD-204 ( )/G Cable Combiner at the distant end of the cable system, The ddm shall regenerate the pcm signals from the cable and radio and make format changes for compatible operation. Prov
36、isions shall be made for insertion of an ow signal with the pcm (except to the radio transmitter) and extraction of the ow from the received signals. Provisions shall also be made for dc from the receive cable to be loop locked to the transmit cable through a closed loop in the TD-204 Cable Combiner
37、 to power the TD-206 Restorers. shall provide for pcm signals plus ow from the radio receiver, to the cable system, from the cable system, andto the radio transmitter. The ddm shall regenerate the pcm signals but shall not The ddm shall interface The ddm shall be compatible with pulse forni The ddm
38、3.3.20.1 From radio receiver signal. This signal is a summation of the pcm and ow signal components. mode transmitter, then gaussian noise is added and shaped in the radio receiver and sent to the ddrn; The components shall have the following characteristics: The signal is sunimed and shaped in the
39、(a) Pulse-code modulation component Voltage 1 V peak-to-peak 21 dB Bit Rate 1,152,000.b/s 2 25 pules per minute (ppm) for 24 channels 576,000 b/s - +12 pprri for 12 channels 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-27358 58 9777706 035
40、6607 O = Data Format Full baud binary before filtering effects of radio. (b) Orderwire component, Variable frequency of 300 to 3400 Hz sine wave with peak-to-peak amplitude equal to 175 2 2.5 percent of pcm peak-to-peak amplitude. 3.3.20.2 To cable system signal. This signal is a summation of the pc
41、m, owp and dc components. The pcm signal shall be regenerated in the ddm formatted to a 2,304,000 b/s diphase summed with the ow and dc signals then sent to the cable system. The components shall have the following characteristics: (a) Pulse-code modulation component Impedance: 50 ohms= Vol tage: 1.
42、8 f V height of 1 pulse following a string of zeros above and relative to the zero level. Pulse Droop: Approximately 20 percent Bit Rate: 2,034,000 b/s 2 50 ppm With a data rates 2,304,000 b/s 2 50 5 Bit Error Rate: ppm, shall be less than 1/10 (equivalent to less than one click when peak signal to
43、root mean square (rms) noise ratio of pcm from radio is 19.0 dB and when ow component is present. Noise insertion for frame and bit synchronization tests at “from radio“ point shall maintain bit synchronization at a signal to noise of 12.5 dB. per minute on any audio channel) (b) Orderwire component
44、. Impedance: 880 ohms 2 10 percent Vo 1 tage : 1.5 V rms minimum and 2.2 V rms nominal. Frequency Response: Frequencies relative to 1 kHz shall be -0.5 dB 21 dB for 300 and 1700 Hz. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-27358 58 M 7
45、Ob 0356608 2 W I (cl Direct current component: 40 milliamperes nominal dc complying. 3.3.20.3 From cable system signal. This signal is a summation of the pcm, ow, and dc components, The received pcm signal from the cable shall be regenerated to the proper bit rate and sent to the radio transmitter.
46、The ow shall be recovered from the cable system and sent to the radio ow system. The components shall have the following characteristics: (a) Pulse-code modulation component Impedance : 50 ohms Vol tage: 20 to 50 millivolt peak-to-peak Pulse Shape: Pulses are distorted by CX 11230 Cable characterist
47、ics. This pulse shape is specified at input to cable. is equivalent to ddm or TD-204 Cable Combiner to cable signals. Cable-input Bit Rate: 2,303,000 b/s 2 50 ppm Data Format: Equivalent to ddm or TD-204 Cable Combiner to cable signal. (b) Orderwire component Impedance : 880 ohms 2 10 percent Vo 1 t
48、age : 0.15 to 15 V rms test tone at 1 kHz Frequency Response: Frequency relative to 1 kHz shall be -0.5 db 2 1 dB for 309 and 1700 Hz (c) Direct current component. 40 mA nominal dc complying used for pulse restorer power from TD-204 Cable Combiner and lock. 3.3.20.4 To radio transmitter signal. This
49、 signal shall be pcm only and shall be a regenerated signal from the cable system with the following characteristics: (a) Impedance: 50 ohms 2 10 percent (b) Voltage: “One“ 0.9 to 1.3 V “Zero“ O to 0.2 V 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-2735 58 U 777770b 0356607 4 W (cl Width MIL-M-29358(MC) 24 channel 0,868 microsecond 2 1 percent (d) Bi
