Slide 1

I NDB Gii Thiu

Tnh nng k thut

SA 1000

Anten

I. Gii Thiu NDB l mt my pht thanh trn tn s thp,trung bnh v ra mi hng,km theo i hiu nhm gip my bay c th bay hng v cc i NDB c t trong cc khng l trong nc v quc t.

i NDB c th dng lm nhim v dn ng di,dn ng tip cn ti sn bay v dng lm i ch hng cho thit b ILS.

NDB l thit b dn ng ph tr bng radio m trm pht mt t pht ra mi hng trn my bay s ch th cho phi cng bit hng bay ti i.II. Tnh nng k thutDi tn lm vicCng sut phtiu chTn hiu nhn dngH thng kim tra v iu khinH thng cp ngunAntenTm hot ngi hiu1.Di tn lm vic2.Cng sut pht Cng sut pht ca i NDB phi c m bo ph sng ng vi mt c ly nht nh ty thuc vo nhim v ca i.Trong ch landing: t 15-20 nautical mile.Trong ch enroute: t 25- 150 nautical mile. Cng sut pht ca mt i NDB khng c vt qu 2dB so vi mc cn thit m bo tm ph sng ca c ly cho php. Vit Nam cc i NDB pht tn s 220- 550 KHz3.iu ch4.Tn hiu nhn dng S dng m Morse quc t. Tc 7 t/1 pht Ni dung: ti a l 3 t (ch hoc s) Thi gian c php mt tn hiu nhn dng khng qu 1 pht.5.H thng kim tra v iu khinTiu chun ti thiu ca h thng kim tra v iu khin ca mt i NDB gm:Cng sut: khi cng sut gim -3dB phi t chuyn my ( hoc tt my).Mt tn hiu nhn dng: Phi t chuyn my( hoc tt my).H thng Monitor c s c: Phi t chuyn my (hoc tt my).6.H thng cp ngunH thng cp ngun y cho 1 i NDB gm 3 dng th t u tin sau: in mng cng nghip AC in my n AC c quy DCKhi mt ngun thi gian chuyn i t ngun ny sang ngun khc ty thuc vo chc nng ca thit b ( thng thng t 8s 20s)H thng chuyn i l tng l h thng chuyn i t ng7.Anten8.Tm hot ngTm hot ng ti a ca NDB l 1000Km ph thuc vo cc yu t:-Ph thuc vo truyn sng vo ban ngy hay ban m-Truyn sng trn mt t hoc mt nc-Cng sut my pht: nh nht 20W ln nht l 5KW9.i hiuIII. Nguyn tc hot ng1.AntenMy pht c cng sut nh hn 1KW th dng anten hnh ch T.

My pht c cng sut ln hn hoc bng 1KW th dng anten tr2.Nguyn tc hot ng Dng in cao tn t my pht truyn ti anten bc x ra ngoi khng gian theo mi hng. Trang thit b t trn my bay:- My thu ADF ( Automatic Direction Finder): dng tn s thp v trung bnh c 3 di tn s:+ Bng 1 t 190-400KHz.+ Bng 2 t 400-800KHz.+ Bng 3 t 800-1750KHz.- i km vi ADF c 2 loi anten:+ Anten v hng c 1 si dy di.+ Anten nh hng: Anten khung c th l hnh trn,vung hoc ch nht.3.Cng dng ca i NDBC 4 cng dng:Dng bay quy hng bay ti i NDBXc nh v tr ang bayDng vng chDng p xung sn bay

4.c im ca NDB u im: Cc thao tc rt quen thuc vi cc phi cng H thng mt t n gin Gi thnh r Nhc im: Chu nh hng rt mnh ca a vt,a hnh v cc nhiu tp ca thi tit,ca my thu ADF thu c ch th sai lm kim ch th lch qu xa gy nguy him cho my bay St nh hoc nhiu x sng in t vo ban m gy ra li i NDBThit b NDB SA 10001.Gii thiu:1.1. M t tng qut L 1 my pht AM, c cng sut sng mang iu chnh c t 200W n 1000W. My pht dng cng ngh Switching cc tng cng sut v cc khi iu ch, n p, lm cho h thng t c hiu sut cao trong 1 kch thc nh gn. Phn kch thch RF gm 1 mch tng hp tn s t 190KHz n 535KHz, iu khin bng thch anh , mt mch dao ng ra 2 tn s m tn 1020Hz hoc 400Hz dng cho i hiu, 1 b to m i hiu theo m Morse c th ci t c bng cc cng tc, 1 mch kim tra v 1 mch x l thoi (ty chn). Phn cng sut ca my pht gm 4 h thng 250W c lp nhau. Mi h thng c 1 b lc ng ra , 1 tng khuch i cng sut switching, b iu ch n p switching. Ng ra RF ca mi h thng c kt ni li v cung cp tn hiu 1000W n b ghp anten. i NDB gm 2 my pht SA 1000 v 1 b chuyn i t ng c t trong 1 t my duy nht.

1.Gii thiu:1.2.c tnhCht lng: Tha mn cc i hi p dng ca ICAO v FCCTn s: 190535KHz, tng hp tn s iu khin bng thch anh, la chn tn s bng cch thay i cng tc vi cc bc cch l 500Hz. n nh tt hn 0,005 (nhit t -40oC +70oC).Cng sut ra: Cng sut sng mang trn ti 50 chnh c lin tc t 200W n 1000W.iu ch : Mch iu ch/ n p cung cp mc iu ch t 0 95. m tn 400Hz hoc 1020Hz trong my c la chn bng cch t jumper.

1.Gii thiu:1.2.c tnh B to a hiu: trong my hot ng bnh thng tc 8 baud (khong 7 vng/pht), c th chnh c t 5 n 16 baud. Ngun in vo: 115/230VAC 10%, 50/60 Hz 1 pha v 144 VDC. Cng sut tiu th danh nh l 1800W vi 1000W cng sut sng mang pht ra v iu ch mc 95. Ngun in bnh: Khi s dng in bnh vo lc mt in, cn phi c 2 loi in th 144VDC v 24VDC. Cng sut i hi cho 144V l 8A v 2,5A cho 24V. Cng sut gim khong 15 hoc nh hn.1.Gii thiu:1.2.c tnh o c: Cc ng h trn mt my s o cng sut ra, cng sut sng di, in th cp cho tng cng sut, dng in cng sut, phn trm bin iu, mc m tn ng vo (khi dung thoi). i hiu: B keyer bng bn dn cung cp 95 cng tc c cc khong tng ng. Trong m Morse, mt khong ny chnh c t 63 ms n 1666 ms. Bo v mch: Cc cu ch ring bit c dung bo v cc mch AC v DC. Mt mch sng di VSWR s dng my pht nu VSWR vt qu 1 gi tr chnh trc . iu kin hot ng: Nhit t -50oC +70 oC, m t 0100.1.Gii thiu:1.2.c tnh Kim tra gim st: My pht s ngng hot ng khi b mt i hiu, iu ch xung thp hn mc chnh trc, tone i hiu b dnh, cng sut xung thp hn mc chnh trc, sng phn x tng ln hn mc chnh trc. Vi h thng c my d phng, tn hiu ngng my s khi ng my d phng lm vic . Ng vo thoi (ty chn): Cn bng, 60020, -17dBm (-28dBm +5dBm), dng DC khng c vt qu 3 mADC.1.Gii thiu:1.3.c tnh ca b ghp anten PC-1 Kilo Tr khng vo: 50. Tr khng ti: 2 25 in tr, 700pF 1500 pF in dung. Tn s: 190KHz 535KHz vi ti 700pF 1500 pF. Cng sut RF ng vo: 2000W trung bnh, 4000W nh. ng h o: Dng anten, cng sut sng di, 1 ng h vi cng tc 4 vtr: OFF, cng sut sng di, 0-20A, 0-10A. iu kin lm vic: Nhit t -50oC +70 oC, m ln n 95%, cao ln n 4000m. B ghp anten c thit k lp t ngoi tri.1.Gii thiu:1.3.c tnh ca b ghp anten PC-1 Kilo Cng hng: Cun dy ln vi cc u chn th, cc u chn tinh v 1 vng chnh cng hng quay c. Cc u chn th v chn tinh c la chn bng cc mi hn phi sau bng thao tc. H thng t ng iu chnh s iu chnh vng cng hng n v tr cng hng chnh xc. Tm in cm ca cun dy l 25H1mH Ngun in vo: 12VDC, 50mA, do my pht cung cp hoc 110/220VAC (ty chn) khi dng vi cc my pht khc. Kch thc: Di 120cm, ng knh 76cm.

1.Gii thiu:1.4.c tnh ca b chuyn i t ng Nhim v iu khin: Tt m h thng, tt m my pht, la chn my pht chnh, reset li my chnh, normal/test. Cc ch bo: Trng thi h thng: PRIMARY: My pht no c chn l my chnh. SECONDARY: My pht chnh hng, my ph ang hot ng. FAIL: C 2 my hng, 1 tip im relay c cung cp sau bng I/O. iu kin lm vic: Nhit t -40oC +70 oC, m t 0100. Bo v mch: Cc cu ch AC, DC, cc ng vo logic c cch ly bi cc tr khng ni tip v cc diode kp.2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 B tng hp tn s: Tn hiu RF c to ra trn card KWOSYN bng 1 mch dao ng LC iu khin c bng in p, hot ng tn s gp i tn s hot ng. Tn hiu ny sau c chia to ra tn hiu 1KHz a n 1 mch vng kha pha PLL so snh vi tn hiu 1KHz chun to ra dao ng thch anh 4096MHz chia xung. in p ra ca mch kha pha s iu chnh tr s t ca diode bin dung trong mch dao ng LC. Tn hiu RF ng ra ca dao ng LC c chia 2 to ra sng vung ng ra cho b la chn tn s bng 3 cng tc loi trn xoay trn card.2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 Tng li RF: Sng vung tn s hot ng t card tng hp tn s c m vi 1 cng o trn card chnh b kch thch trc khi a n ng vo ca tng khuch i cng sut . m tn i hiu: Card to m tn i hiu to ra 2 tn hiu m tn 400Hz v 1020Hz. Mt trong 2 tn hiu ny c la chn v a qua 1 cng do mch to i hiu kim sot , 1 cng do mch m tn kim sot v nt chnh Modulation Level Control trn mt my kim sot.

2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 B to i hiu: 1 card m ha i hiu, 1 hoc 2 card thanh ghi dch m ha ty thuc vo chiu di i hiu cc bits m ha c cha trong card thanh ghi dch m ha n cng cho php m tn qua bng xung nhp 8 MHz iu chnh c.i hiu c sp c bng cc cng tc dip trn card thanh ghi dch m ha nh sau: 1 chm (tt) tng ng vi 1 cng tc c ng, 1 gch (te) tng ng 3 cng tc lin tip c ng. Khong cch gia cc ch l 3 cng tc c m. Tt l 1 m di 125ms v te l 1 m di 375ms.2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 Phn thoi (ty chn): Khi c yu cu s dng thoi trn NDB.., n s c x l tr6n card m tn, gm c: mch lc m tn, mch kim tra li t ng (AGC), iu khin ting n (squelch), v mch ct nh. Tng iu ch: Tn hiu tng hp t tng li iu ch s c a vo 1 mch iu ch rng xung to ra 1 chui xung 120160 KHz vi cc rng xung tng ng vi in p ng vo. Nhng xung ny s iu khin 1 mch n p switching to in p iu ch cho tng cng sut.

2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 Tng li iu ch: Cc tn hiu i hiu,mt mc DC, v thoi c cng li, m v iu chnh mc trn card chnh b kch thch trc khi a n ng vo tng iu ch. Tng iu ch GPS (ty chn): i vi h thng NDB pht ra tn hiu sa sai DGPS, ngi ta s dng card giao tip iu ch GPS thay cho card tng hp tn s KWOSYN. Khuch i cng sut: Cc b khuch i cng sut loi switching ton cu s khuch i tn hiu RF t tng li RF v cung cp tn hiu iu ch n cc khi lc.

2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 Mch lc: Cc khi lc bao gm tn s 190KHz 535KHz trong 5 bng. Cc bng c la chn bng cc jumper. Kim tra: Tn hiu ng ra ca b lc c a qua card KWRF n ng ra RF 50. Cng sut ra, cng sut sng di v iu ch c ly mu trn card ny v c dng cung cp cho ng h o trn mt my. Ngoi ra cc tn hiu ny cng c x l trn cc card kim tra cung cp tn hiu ngng my trong trng hp cng sut pht gim, mc i hiu thp, m i hiu b dnh, sng di cao.

2.Nguyn l hot ng:2.1M t chc nng cc khi trong SA1000 Ngun cp in: Ngun pht cho my pht c th c cung cp t 115/230 VAC hoc 24 VDC v 144 VDC hoc c hai. Ngun AC cho mi nhm RF l loi nn in cu thng thng, lc bng t. Khi h thng dng c 2 ngun cung cp AC, DC, ngun DC s cung cp khng b gin on khi b mt in AC. B np bnh (ty chn): H thng np s t ng np bnh theo 2 cch, np nhanh v np chm thy thuc vo iu kin ca bnh. Mch bo v s m bo bnh khng np hoc x qu mc an ton.

Tm hot ng ca mt i NDB ph thuc vo nhiu yu t v khng th ni chc chn c. cng trng c th tnh ton c nu bit dn in ca mt t. Tuy nhin cng trng cn thit li ph thuc vo iu kin nhiu mi trng, ph thuc vo v tr t i. Mt cng trng khong 70 V/m th th M hoc chu u nhng li khng cho nhng vng trong v gia 300N v 300S.IV.Anten1.Anten ch T i xng Thng c dng vi cc my pht t 500 n 1000W nu t xy dng, anten loi ny i hi mt din tch t vo khong 46mx122m i vi chiu cao anten 18m, v 46m x 152m vi anten 36m. Anten ch T i xng chun gm 2 ct cao 60 feet (18m) t cch nhau 300 feet (100m), thnh phn bc x ng cao 55 feet (16m) v 2 dy di 280 feet (85m) nm ngang trn nh. in dung ng vo thay i trong khong 480pF tn s 190KHz v ln n 1150pF 535KHz. Chiu cao hiu dng vo khong 49 feet (15m).1.Anten ch T i xng in tr ng vo gm in tr bc x cng in tr tiu hao. in tr bc x thay i trong khong 0,14 190KHz n1,13 535KHz. in tr tiu hao ty thuc vo nhiu iu kin m nh sn xut khng lng c, thng thng t khong 2-5.

1.Anten ch T i xng Tm hot ng ph thuc vo cng trng, iu kin t v cng sut bc x. Cng sut bc x tng theo tn s tuy nhin mt mt truyn sng do nh hng mt t gim theo tn s. vi cng trng 70 V/m, t tt, tm hot ng dao ng trong khong 165 dm tn s 190KHz v 150 dm 535KHz vi my pht 500W v khong 220 dm tn s 190KHz v 170 dm 535KHz vi my pht 1000W.2.Anten tr Anten tr c dng nhng ni khng t lm anten ch T. Mt s nhnh nm ngang trn nh anten tr c gn thm nhm 2 mc ch: gim in khng ng vo v dn n gim in p trn anten v tng cao hiu dng. Anten tr v mt in km hn anten ch T vi cng cao v b gim ti trn nh.THANK YOU!!!