1、MIL-R-22678 (4) 58 7777706 0353465 3 i f- MI.L-Ri22678 (AS) Amendment 4 Superseding Amendment 3 28 September 1967 ZLAJX .ls68_1. MILITARY SPECIFICATION RECEIVER-TRANSMITTER RADIO RT-542/ASQ and RT-542A/ASQ This amendment forms a part of Military Specif ,:ation MIL-R-22678 (WEP) dated 1 November 1960
2、 and has been approved by the Naval Air Systems Command, Department of the Navy. By this amendment basic MIL-R-22678 (WEP) is changed to MIL-R-22678 (AS) and throughout the specification, Bureau of Naval Weapons shall be changed to Naval Air Systems Conmand. Page I, Title: Add “and RT-542A/ASQ. II P
3、age 1, paragraph 1.1 : Add “(5) Communication by means of .At4 Radio Telephone (A-3) when used in conjunction with Juliet-28 equipment. Page 1, paragraph 1.2: Add “(12) Juliet-28 (RT-542A/ASQ only) - (13) Control , Radio Set C-8057/ARC (RT-542A/ASQ only) - Page 2, paragraph 2.1, after “Invitation fo
4、r bids“: “exceDt the dated document indicated below,“ add Page 2, paragraph 2.1, under SPECIFICATIONS Military: Add. “MIL-I-6181B (29 May 1953) Interference Limits, Tests and Design Requirements, Aircraft Electrical and Electronic Equipment (See 2.2 ( 2) ) II Page 2, paragraph 2.2: Delete and substi
5、tute “2.2 Avai labi 1 i ty of Documents : (1) When requesting specifications, standards, drawings and oublications refer to both title and number. Copies of this specification and applicable specifications re- quired by contractors in connection with specific procure- ment functions may be obtained
6、upon application to the Commanding Officer Naval Supply Depot, Code 105, 5801 Tabor Avenue-, Phi 1 adel phia , Pennsyl vani a 191 20. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-22678 (L() 58 m 9779706 OL514bb 5 M . MIL-R-22678 (AS) Amendme
7、nt 4 (2) Specification NIL-1-61812 is available only from Naval Ai r Sys terns Cornland a Washington 25, D. C. Attention: Arionior. Mrlsion.“ Page 2: Add “3.2.8 Pntenna Conducted Interference - Antenna conducted interference shall meet the recuirenents of SDecification %IL-I-6181B except that at _ .
8、 - _. not more than 9 of the 18 injectjon frequencies the antenna conducted interference due to the main receiver injection freauency shall not exceed 300 microvolts . I *Page 5, paragraph 3.3.2: Add “the sensitivity of the auxiliary audio and the auxiliary guard audio shall be such that when an R-F
9、 inyut of 5 microiolts (onen circuit) modulated 30% at 1000 cycles is applied, the signal clus noise-to- noise ratir shall be not less than 3.0 db for the auxi1iar.y audioand not less than 6 db for the auxiliary 5uard audio.“ Page 5; paracraDh 3.3.2.1: Delete and substitute “3.3.2.1 Degraded or Unus
10、able Channels Due to internal !nterference - Certain main receiver channel freouencies may be degraded or unusable due to i nternal ly generated interference. bihen the-ecui pnent is supplied with the guard freauency set for 243.0 mc, the main receiver sensitivity measurements shall be made with an
11、input of 20 microvolts at frequencies of 241.1, 241.2, and 275.6 mc. Six unusable channels 242.1, 246.6, 253.3, 287.1 , 322.8 and 339.0 nc are permitted which are independent of the guard receiver frequency. Page 5, paragraeh 3.3.3, Line 2: Page 6, paraoraoh 3.3.4: Delete “25“ and substitute “250“.
12、Delete table and substitute TEAL EA.NDliiI DTH RT - 5 4 2 / P. SQ RT-542A/A SQ Attenuation Bel ow Resonant RecFionse Guard Receiver Kain Receiver Kai n Receiver 6 db 60 Kc min 60 Kc nin 80 Kc min 60 db 400 Kc nax 200 Kc rcax 200 Kc max Page 6, paragraph 3.3.9.1: Add “the auxiliary guard output shall
13、 be 0.15 - 0.45 volt rms when loaded with 600 ohins. -2- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-/- MIL-R-22678 (Lo 58 3777706 0151467 7 W MIL-R-22678 (AS) Amendment 4 Page 7, paragraph 3.3.9.3: Delete and substitute “3.3.9.3 Auxi 1 i ary Ci
14、rcui t - The auxi 1 iary ci rcui ts shall del i ver only signals detected by the variable frequency receiver. microvolt signal modulated 30% at 1000 cps is applied, the output shall be at least 0.25 volt, and when the modulation frequency is varied from 70 to 7000 cps, the output for any frequency i
15、n the range of 70 to 200 cps shall be within +4.5 and -3.0 db and in the range 200 to 7000 cps shall be within t2 and -3 db of the output obtained at 1000 cps. The RT-542A/ASQ shall not vary more than t4 and -4 db from the output obtained at 1000 cps when the modulation frequency is varied When a 10
16、00 - from 70 to 20,000 cps.“ Page 8, paragraph 3.3.12.1 .l: “Frequency Cps 150 300 600 1,000 3,000 6,000 1 o ,000 15 ,000 20,000 Delete table and substitute Relative Output in dh hT- 542/ASQ RT-542A/ASO -8 or lower -5 or lower -3 to -7 +c to - t1 to -2 t3 to -3 O (ref. level) 0 (ref. level) +2 to -2
17、 +2 to -2 t2 to -2 +3 to -3 +1 to -5 t4 to -4 - t4 to -4 +4 to -4 I - Page 8, paragraph 3.3.12.2: Delete and substitute “3.3.12.2 Tone Modulation - Not less chan 70 percent nodulation of the r-f carrier shall occur when tone transmission is selected and the transmitter is keyed. *Page 9, paragraph 3
18、.3.16: Add The frequency of modulation shall be 1000 cps 2 20X.“ “Under the above condition the auxiliary audio and the auxiliary guard shall have a signal plus noise-to-noise ratio not less than 20 db.“ Page 11, paragranh 3.4.1.2: Delete “8-57/64“ and “20-5/22“ and substi tute respectively “9“ and
19、1120-5/32“. Page 11, paragraph 3.4.1.2: Add “The front panel shall extend an additional 1-1/16 inches below the base plate and the rear guide pins shall extend an addition 11/32 inches beyond the rear of the case.“ I Page 11 , paragraph 3.4.1.3: Page 12, paragraph 3.4.1.5.3: Delete “PT076-10-6s“ and
20、 substi.tute “PT07C-10-6S.“ Delete “44.5“ and substitute “45.0“. -3- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-22678 .(AS) hnedmen t 4 Page 13, paragraph 3.4.1.8.3: Add “The auxiliary guard output of the RT-542A/AjQ shall be terminated in
21、 a 600 ohm load, including means for measuring the audio output voltage.“ Page 13, paragraph 3.4.1.8.4, under “Carbon Microphone Innut:“ Delete “Frequency range 150-1O;OOO cps“ and substi tute “Frequency range 150-10,000 CPS (RT-542/ASQ) 150-20,000 CPS (RT-542A/ASO)“ “Dynamic Mike Input“: Delete ,“F
22、requency range 150-10,000 cpsland substi tute “Frequency rance 150-10,000 cps (RT-542/ASQ) . 150-20,000 CPS (RT-542A/ASQ) Add Note: 1.0 volt rms open circuit must be supplied when the RT-542A/ASQ is used with Juliet Equipment.“ *An asterisk preceding a page number denotes a chanoe to be made to the specification which did not appear in Amendment 3. -4- U. S. GOVERNMENT PRINTING OFFICEi lW-341*SIYA-lYO Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
