1、9999974 OLbLOBO 526 A-A-59 127 October 15, 1997 COMMERCIAL ITEM DESCRIPTION Generator, Signal, VORALS, AN/ARM-180 The General Services Administration has authorized the use of this commercial item description (CID) for ali federal agencies. 1. SCOPE. This commercial item description covers a VOR/ILS
2、 signal generator. This CID is meant as a minimum requirement for the VOR/ILS signal generator in which only those manufacturers that meet or surpass the following requirements are qualified per this CID. This signal generator shall produce both rf and audio signals for testing VOR, localizer, glide
3、slope, and marker beacon signals. 2. SALIENT CHARACTERISTICS. 2.1 The equipment shall meet Class 3 requirements of MIL-PFW-28800 and be bid sample tested within the accuracies, limits, and specifications herein. 2.2 Environmental requirements. 2.2.1 Temperature requirements. The product shall meet i
4、ts performance and accuracy requirements in an operating temperature of +1O“C to +40“C and non-operating -20C to +65“C. 2.2.2 Electromaanetic interference (EMI). The equipment shall comply with the EMI requirements specified for Class B equipment in MIL-STD-46 1 , excluding tests CE06, CE07 and modi
5、 tests RE02, RS03 as follows. a. RE02 full limits to 10 times the highest used or intentionally generated fkequency or 1 GHz whichever is greater. b. RS03 full limits to 1 GHz. Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this docum
6、ent should be sent to: Technology k2.0 dB for RF output level from -60 to -120 be supplied both separately and together; be of sufficient magnitude to modulate the carrier to a preset depth of 40% and a variable range from 10 to 80% AM; vary simultaneously and proportionately. 2.11.3.4 90/150 Hz pha
7、se error. The phase error of the 90 and 150 Hz signals shall not exceed 1.0“. Relative phase is defined as the difference in 30 Hz degrees of the points at which the 90 Hz and the 150 Hz wave form crosses the zero axis in the same direction at the same time. 2.1 1.3.5 DDM control. The output ratio o
8、f the 90 Hz signals shall have presets at 0.000,0.175 and 0.400 +0.001 DDM, at both 90 Hz predominant and 150 Hz predominant for all settings except 0.000 DDM. For purposes of determining DDM, the base shall be 0.40 for the GS function. 2.1 1.3.5.1 Variable DDM control. A control shall be provided t
9、o continuously vary the DDM from 0.800 k.001 DDM, 90 Hz predominant to 0.800 S.001 DDM, 150 Hz predominant. This control shall have an off position in which the variable DDM circuitq is not operative. 2.1 1.3.6 90 Hz and 150 Hz delete. Two front panel controls shall be provided to delete the 90 and
10、150 Hz tones independently or simultaneously. 2.12 LOCALIZER GENERATOR. 2.12.1 Localizer shall be supplied both separately and together; shaii be of sufficient amplitude to modulate the canier to a preset depth of 10% and a variable range from 5 to 40% AM; shall vary simultaneously and proportionate
11、ly. 2.12.3.4 90 Hz and 150 Hz phase error. The phase error of the 90 Hz and 150 Hz signals shall be as specified in 2.1 1.3.4. 2.12.3.5 DDM control. The output ratio of the 90 Hz and 150 Hz signals shall have presets at 0.000,0.046,0.093,0.155, and 0.200 kO.001 DDM, for both 90 Hz dominant and 150 H
12、z predominant for all signals except 0.000 DDM. For purposes of determining DDM, the base shall be 0.20 when the function selector is in the LOC function. 2.12.3.5.1 Variable DDM control. A control shall be provided to continuously vary the DDM fiom 0.400 M.001 DDM 90 Hz predominant to 0.400 M.001 D
13、DM 150 Hz predominant. This control shall have an off position in which the variable DDM circuitry is not operative. 2.12.3.6 90 Hz and 150 Hz delete. Front panel controls shall be provided to delete the 90 Hz and 150 Hz tones independently and simultaneously. 2.12.3.7 ID tone. The 1020 Hz signal sh
14、all amplitude modulate localizer frequencies, either separately or with the LOC modulation present and shall be selectable by a front panei ON-OFF control or function selector. 2.12.3.7.1 Modulation. The depth of modulation of the localizer frequencies by the 1020 Hz signal shall be fixed at a modul
15、ation level of 30.0% S.5% with 4.0% RF tone distortion. 2.13 VHF Omnirange penerator. 2.13.1 VOR nenerator selection. The VOR signai generator shail be selected by means of an ON- OFF control located on the front panel. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without l
16、icense from IHS-,-,-9999974 OLbLOBb T44 m A-A-59127 2.13.2 RF frequencv range. The VOR signal generator shall provide continuous sine waves over the frequency range from 108.00 to 117.95 MHz It0.002% in 50 KHz steps. These frequencies, referred to as rf herein, shall be modulated as specified herein
17、. 2.13.2. i RF freauencv selection. The output frequency shall be selected by means of a front panel control. 2.13.2.2 RF freuuency stability. The variation in frequency of the rf output frequency shall not exceed +0.0025%. 2.13.2.3 RF spectral purity. At the frequencies specified in 2.9.2, the foll
18、owing specifications shall be met: a. The level of any harmonic on the desired rf signal shall be at least 30 dB below the output level of the desired fundamental rf signal. b. The total of all spurious signals, including subharmonics, accompanying the desired rf signal shall be at least 75 dB below
19、 the output level of the desired r signal at +15KHz and at least 80 dE3 below the canier output level at +25.0 KHZ in a 300 Hz resolution bandwidth, as measured at the RF IN/OUT connector and into a 50 ohm load. c. The level of broadband noise on the desired rf signal shall be at least 122 dB below
20、the carrier output level measured in a 1 Hz noise bandwidth at 40 KJ3.z from the canler frequency, as measured at the RF IN/OUT connector and into a 50 ohm load. 2.13.3 VOR tones. The VOR carriers shall be amplitude modulated by 30 Hz (variable phase), 9960 Hz (frequency modulated by a 30 Hz referen
21、ce phase signal), and 1020 Hz sine wave af tones. 2.13.3.1 Audio freuuencv accuracv. The 30 Hz variable and reference phases, the 9960 Hz, and the 1020 Hz signals shall be accurate to within f0.005%. 2.13.3.2 Audio freauencv spectral uurity. The total distortion due to harmonics, noise, and spurious
22、 signals shall be 0.25% for the 30 Hz reference, 1% for 30 Hz variable, 0.5% for the 1020 Hz identification signal, and 1.5% for 9960 Hz, and 2.0% for auxiliary audio frequencies. 2.13.3 2.1 Incidental AM due to FM. With the 9960 Hz signal frequency modulated with a deviation ratio of 16 +1 by a 30
23、Hz signal, the amplitude modulation of the 9960 Hz signal shall not exceed 1.0%. 2.13.3.3 9960 HZ FM subcarrier. The 9960 Hz subcarrier shall be frequency modulated by a 30 Hz fixed reference phase signal, With a peak deviation 480 f5 Hz. The 9960 Hz FM signal shall amplitude modulate the rf carrier
24、s. 2.13.3.4 30 Hz variable phase simal A second 30 Hz signal shall be provided which is variable in phase with respect to the 30 Hz fixed phase reference signal from O“ to 359.99 lagging in O. 1“ steps. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
25、-,- E 9999974 0161087 980 = A-A-59 127 2.13.3.5 30 Hz freauenq equality. The 30 Hz reference signal and 30 Hz variable signal shall be coherent. 2.13.3.6 Bearing sid. The 9960 Hz subcarrier (9960 FM signai), which is frequency modulated by the 30 Hz reference signal, and the 30 Hz variable phase sig
26、nai shall amplitude modulate the RF carriers both separately and simultaneously. 2.13.3.6.1 Modulation depth. The 9960 Hz FM signal and the 30 Kz variable signai shall each be of sufficient magnitude to amplitude modulate the RF carriers to the depth of preset 30% and variable from 10 to 35%. 2.13.3
27、.6.2 Bearing selector. A control shall be provided to vary the bearing from 000.0 to 359.99 in 10 and 0.1 steps. 2.13.3.6.2.1 Bearinaaccuracy. ThebearingoftheVORsignal ontheRF carriershall bewithin M. 14 of the audio bearing as set by a VOR standard (Collins Radio Group model 478A.3 or equal). 2.13.
28、3.7 30 Hz variable and 30 Hz reference delete. Front panel control shall be provided to delete the 30 Hz variable and 30 Hz reference signals independently and simultaneously. 2.13.3.8 ID tone. The 1020 Hz shall amplitude modulate VOR frequencies both separately an with the VOR modulation present. A
29、 ON-OFF front panel control shall be provided for this signal. 2.13.3.8.1 Modulation. The depth of modulation of the VOR frequencies by the 1020 Hz signal shal be fixed at a modulation level of 30.0% e.5% with less than 1% RF distortion. 2.14 Interface. The VOR/ILS Signal Generator shall provide a I
30、EEE Standard 488 intedace function and connector. The signal generator shall have a capability of being remotely programmed all the necessary functions Activity: Air Force - 82 (Project No. 6625-FO68) 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
