1、MIL-A-22765 5 7779706 0353634 O = I -. i .i._ . .=-:. . - : - - . M I L-A-22 7 6 5 (WEP) 20 FEBRUARY 1961 MILITARY SPECIFICATION AMPLIFIER-POWER SUPPLY-RECEIVER AM-2349(*)/ASQ-19 AND ANTENNA AS-1059(*)/ASQ-19 This specification has been approved by the Bureau of Naval Weapons, Department of the Navy
2、. 1. SCOPE 1.1 Scope - The equipment covered by this specification, when installed in the (I) Reception of UHF voice communications. (2) A continuous indication, .in degrees, of the direction of arrivai of received UHF signals. (3) Antenna switching functions. (4) Generation of B+ and bias voltages
3、for use by other equipments which are a part of the integrated electronics centrai. (5) Relay switching and distribution of a-c and d-c voltages for operation of the equipment in the integrated electronic centrai. Associated Equipments - The equipment shall operate with the following integrated Elec
4、tronic Centrai AN/ASQ-19, shall provide the following: Q, *.a ,a.* e 1. 2 associated equipment which shall not be supplied as part of the equipment. Receiver- Transmitter, Radio RT-546/ASQ-19 Receiver- Transmitter, Radio RT-547/ASQ-19 milse, Decoder KY-312/ASQ-19 Coder-Receiver- Transmitter KY-3ll/A
5、SQ-19 Indicator, Bearing-Distance-Heading ID-663/U ._ Earphone H-8?A/U THIS DOCUMENT CONTAINS , and when the signal input (30% modulated at 1000 cps) is varied from 10 microvolts to 100,000 microvolts, the audio output power shall not vary by more than f 3 db from the audio output obtained with the
6、1000 microvolt signal. Additionally the receiver shall be protected against blocking under conditions of input signals up to O. 5 volt. Selectivity -The over-all selectivity of the receiver shall fall within the limits set forth below for either standard or service conditions: 3.3.1.3 3.3.1.4 Attenu
7、ation Below Resonant Response Total Receiver Bandwidth 60 kc min. 6 db 60 db 200 kc ma. 3.3.1.5 Images and Other Spurious Responses -When receiving on any channel, the receiver shall attenuate images and other spurious responses to the maximum practicable extent and, in any case, not less than 60 db
8、 relative to the desired signal. Not more than 3 spurious responses on a guard receiver channel shall be attenuated between 40 and 60 db. than 300 microvolts in the frequency range of 200 to 400 mc when the guard receiver is operating and less than 100 microvolts when the main receiver is in use. 3.
9、3.1.6 Antenna Conducted CW - The antenna conducted interference shall be less 5- o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-A-22765 5B m 7977906 0353639 T = MIL-A-22765(WEP) 3.3.1.7 I-F Rejection - The receiver shall present an attenuati
10、on of not less than 80 db relative to the response of the desired signal to signals on the frequencies of the intermediate frequency amplifiers. 3.3.1.8 Regeneration - The interstage and over-all regeneration of the receiver shall be so minimized that no evidence of unnecessary oscillation, instabil
11、ity, or excessive regeneration shall occur under either standard or service conditions. 3.3.1.9 Noise Peak Limiter - The second detector of the receiver (following the intermediate frequency amplifier) shail be provided with an instantaneous noise peak limiter. The noise limiting action shall effect
12、ively limit the audio output voltage of modulating surges or peaks exceeding 50 k15% modulation of r-f signal, Its action shall be rapid enough to prevent loss of intelligibility due to reduction in receiver gain under the influence of con- tinuous r-f noises such as are caused by commutators, ignit
13、ion systems, etc. When a pulsed signal having a pulse duration of 10 microseconds, a pulse repetition frequency of approximately 1000 pulses per second, and peak amplitudes up to O. 1 volt, is applied on the same frequency as a desired signal modulated 30% at approximately 1000 cps, not more than 50
14、 microvolts input (desired signal) shall be required to obtain a signal plus noise-to-noise ratio of 3 db. 3.3.1.10 Audio Characteristics - The audio characteristics of the receiver shall be as set forth below, Except where otherwise stated, these requirements apply under both standard and service c
15、onditions. 3.3.1.10.1 Capability - Under standard conditions, the receiver shall be capable of delivering an output of at least 250 milliwatts when a signal having any level between 100 and 100,000 microvolts.modulated 30% at 1000 cps is applied, and the total harmonic content of the receiver output
16、 shall not exceed 10% at the 250 milliwatt level. Under service conditions, the output shall not be more than 6 db below that obtained under standard conditions. Under the reduced performance conditions, an output of at least 30 milliwatts shall be obtained when a 10,000 microvolt signal modulated a
17、t 30% at 1000 cps is applied. 3.3.1.10.2 Over-All Fidelity - Audio response at modulation frequencies from 300 to 4000 cps shall not vary more than +1 to -3 db relative to the response at 1000 cps. Modulation frequencies outside the 300 to 4000 cps range shaU be attenuated the maximum practicable am
18、ount without employment of large and/or heavy filter components in the receiver. is applied to the receiver, the auxiliary output shall be at least O. 25 volt, and when the modulation frequency is varied from 70 to 20,000 CPS, the output for any frequency in the range shall be within f 3 of the outp
19、ut obtained at 1000 cps. The phase shift throwh the receiver shall not exceed 110 degrees at 100 cps. Signal to Noise Type Squelch Characteristic - The receiver squelch shall be controlled by the audio signal plus noise-to-noise ratio. Under conditions of 6 microvolts r-f input modulated at 400 cps,
20、 the squelch control provided within the receiver shall have such a range as to permit squelch operation from no modulation to 3% modulation, With the squelch control adjusted to obtain normal audio output with modulation input required for 6 db signal plus noise-to-noise ratio, the audio shall be e
21、ffectively suppressed when the modulation input is reduced to a 1 db signal plus noise-to-noise ratio. The squelch operation shall be smooth and positive and shall effect a change in audio output of 10 db or more at the threshold of operation. With the squelch adjusted as above the audio output shal
22、l be 50 milli- watts or greater with 6 microvolts input modulated 30% at 1000 cps. 3.3.1.10.3 Auxiliary Output - When a 1000 microvolt signal modulated 30% at 1000 cps 3.3.1.11 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I I . ._ NIL-A-227b5 58
23、 9779706 0151540 b MIL-A-22765 NEP) 3.3. P. 12 Noise Modulation - Under standard conditions, ,the signal plus noise-to-noise ratio shall be at least 30 db when a 10,000 microvolt signal modulated 30% at 1000 cps is applied and the receiver output (signal plus noise) is adjusted to 250 milliwatts. Ch
24、annel Changing Time - The time between the instant the.channe1 selector switch is positioned to select a given channel, and the instant the equipment is in an operative condition on the selected channel shall not be greater than 6 seconds under service conditions. This requirement shall hold for shi
25、fting the operating frequency of the equipment between any two available channels. During channel changing operation, the output of the receiver (headt,et circuit) shall be shorted or otherwise reduced to zero. 3.3.1.14 Accuracy of Automatic Tuning -When the same frequency channel is selected severa
26、i times in succession, the receiver audio power (with an input signal of 100 microvolts or greater modulated 30% at 1000 cps) shall not vary by more than O. 5 decibel from the power output obtained initially. This requirement shall be met under standard or service conditions. operation under either
27、standard or service conditions for five minutes or more shall be such as to maintain the equipment frequencies within the limits shown below provided that the required quantity of cooling air is supplied. 3.3.1.13 3.3.1.15 Frequency Stability - The frequency stability of the complete equipment after
28、 Receiver resonant frequency tolerance: f 22.5 kc. 3.3.1.16 Terminations: 3.3.1.16.1 Receiver R-F - R-f input to the receiver shall be applied through a 52-ohm cable from a signal generator having an effective source impedance of 52 ohms, Sensitivity shall be measured in terms of “open-circuit -. -
29、,-e- and the fact that the Government may have formulated, furnished or in any way supplied the said drawings, specifications or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use or sell any patented invention that may in any way be related thereto. 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
