truyenthanhvotuyen

H thng truyn thanh v tuyn bao gm my pht FM ti trung tm v cc my thu - tng m c t ti cc im loa cng cng

HNG DN S DNG

H THNG TRUYN THANH V TUYN

H Ni 2015

H THNG TRUYN THANH V TUYN

I/ TC DNG CA H THNG TRUYN THANH C S:Truyn thanh c s l mt knh thng tin quan trng a ch trng, ng li ca ng, chnh sch, php lut ca Nh nc, thng tin v tnh hnh chnh tr, kinh t, vn ha, x hi, an ninh quc phng ca t nc, a phng v thng bo v cng tc ch o, iu hnh ca cp y, chnh quyn c s n vi mi qun nhn, l din n th hin quyn c bit, c bn ca qun nhn, ng thi gp phn trang b thm kin thc, nng cao tinh thn cnh gic cch mng, chng ph mi m mu phn ng ca cc th lc th ch, tng cng tinh thn on kt, to sc mnh tng hp thc hin thng li cng cuc bo v v xy dng qu hng, t nc.

i truyn thanh c s c hai chc nng chnh, l phng tin cp y, chnh quyn lnh o, ch o, iu hnh nhim v chnh tr, cng tc qun s, pht trin kinh t - x hi, m bo an ninh quc phng ca a phng v tip sng cc chng trnh pht thanh ca i Ting ni Vit Nam, chuyn ti thng tin, ch trng, ngh quyt ca ng y, ca cp y, tnh hnh thc hin nhim v ca cc n v kp thi n mi qun nhn. Vi c th l a thng tin nhanh nhy v cc s kin bng m thanh, i truyn thanh c s c vai tr ht sc quan trng i vi vic n nh chnh tr, an ninh, quc phng v pht trin kinh t - x hi. Thng qua h thng truyn thanh c s, mi qun nhn u nm bt c ch trng, ng li ca ng, chnh sch, php lut ca Nh nc, tnh hnh ca n v, tip cn vi khoa hc k thut, tip nhn cc kin thc v kinh t, vn ha, x hi. Trn c s , nng cao thc chp hnh php lut, k lut, i mi t duy, ci thin v pht trin i sng. c bit, trong thi gian qua, cc th lc th ch lun tm cch tuyn truyn chng ph Vit Nam thng qua cc lun iu: xuyn tc ch ngha Mc L nin, t tng H Ch Minh, trc tip nht l quan im, ch trng, ng li, chnh sch, php lut ca ng v Nh nc lin quan n pht trin kinh t, vn ha, x hi, an ninh quc phng min ni. Chng li dng nhng kh khn trong cuc sng v s thiu thng tin ca nhn dn, c bit l cc vng cao, vng su, vng xa, cc x c nhiu ng bo dn tc thiu s sinh sng truyn o tri php, i lt tn gio hot ng chnh tr, mc ni xy dng c s. V vy, vic m bo thng tin trung thc, kp thi, hiu qu ti cc tng lp nhn dn c nc ni chung v i vi mi qun nhn trong mi trng Qun i ni ring l mt nhim v quan trng v cp bch. Mt trong nhng gii php hu hiu thc hin nhim v ny l tng cng, cng c, nng cao cht lng hot ng ca h thng truyn thanh c s.

II/ CC PHNG PHP THC HIN TRUYN THANH CNG CNG.

1. Phng php truyn thanh bng tng m v dy dn.

y l phng php c in c p dng t lu nay. Ti trung tm ta t mt hoc nhiu b tng m cng sut ln, c u ra in p cao. u ra ca tng m c a n cc i dy dn (thng l dy lng kim) mc trn mt h thng cc ct g hoc b tng dn n cc loa phng thanh.

2. Phng php truyn thanh v tuyn.

y l phng php mi, p dng cc tin b KHKT v lnh vc pht v thu sng cc ngn iu tn (FM). Ti trung tm, cc tn hiu m thanh t micro, my ghi m c a vo my pht sng FM iu ch sng mang. Sng cao tn c iu ch s c bc x vo khng gian nh h thng cp dn v ngten pht.

Ti cc im thu, cc my thu FM s thu sng ny, tch tn hiu m thanh a vo tng m ra loa phng thanh. Ton b my thu FM v tng m c kt cu thnh mt thit b ng nht. My thu - tng m c cp in trc tip thu, khi no c tn hiu my pht th my thu s t ng cp ngun cho tng m hot ng v m thanh mi c pht ra loa.

3. Phng php truyn thanh v tuyn c m.

nng cao kh nng bo mt thng tin v chng nhiu ca h thng truyn thanh v tuyn, trnh l lt thng tin ni b ra ngoi n v v trnh cho cc my thu - tng m b kch v lm vic ngoi mun do nhiu hoc i l, hoc do sng ln cn mnh, Vin chng ti thit k phng php truyn thanh v tuyn nhy tn c m ho. C th l my pht FM c kh nng t ng nhy tn ngu nhin mt trong 4 tn s mi khi bt ngun my pht, ngoi ra b sung tng cng thm b phn m thoi m ha tn hiu Audio hoc Micr t u vo c tc dng bo mt thng tin ng thi c thm b m iu khin k thut s to kho m m, kho m tt, mi my thu c thm cc b gii m, nhy tn ng b vi my pht, so snh kho m m v tt my thu theo s iu khin ca my pht.

Sau khi my thu nhn ng sng v nhn c tn hiu m ng th my thu s gii m a tn s ca my thu v ng vi tn s cng tc ca my pht, gii m tn hiu thoi, gii m iu khin, ng mch tng m v pht tn hiu thoi ra loa.

Nu my thu nhn ng sng nhng tn hiu m khng khp vi kho m t trc, my cng khng ng mch tng m ra loa. Vic tt my thu cng tng t nh vy.

III/ SO SNH CC PHNG PHP TRUYN THANH CNG CNG.

Sau y chng ta so snh hai phng php truyn thanh c dy dn v v tuyn:

Phng php truyn thanh s dng tng m v dy dn quen thuc hn, yu cu chuyn mn nghip v t hn nhng cht lng m thanh khng cao (do tng m cng sut ln, u ra bng bin p d gy mo). Mt khc nu phi dn xa, vic u t ct, dy dn cng kh tn km. ng dy di v treo ct cng c th d nhim st v chm chp.

Phng php truyn thanh v tuyn c u im ni bt l cht lng m thanh cao hn. Vic trin khai h thng cng gn nh hn rt nhiu (do khng phi chn ct, ko dy). Mt khc, khi c nhu cu di chuyn a im t loa phng thanh, c th thc hin nhanh chng v khng tn km. Vi h thng truyn thanh v tuyn nhy tn c m ha cn c kh nng bo mt thng tin, trnh l lt thng tin ni b ra ngoi.HNG DN S DNG

H THNG TRUYN THANH V TUYN NHY TN C M HA-----***-----

H thng truyn thanh v tuyn nhy tn c m ha bao gm my pht FM ti trung tm v cc my thu - tng m c t trong nh ti cc im do Th trng n v quy nh thun tin cho cng tc lnh o, ch huy iu hnh n v bao gm: - My pht thanh FM cng sut trung bnh 100W.

- Cc thit b to tn hiu (Radio casset, CD, Micro).

- B trn tn hiu m thanh (Mixer).

- B m ha tn hiu thoi, b to m iu khin nhy tn, b to m iu khin tn hiu ng dng k thut s tch hp trong my pht.

- Ct anten + anten pht sng.

- B thu FM t ng k thut s c gn b gii m v loa.

y l h thng truyn thanh hin i, ph hp vi iu kin pht thanh ca cc i truyn thanh c s, va n gin, d s dng li em li hiu qu thu- pht cao.1. My pht.

My pht c chc nng pht ra sng cao tn, nng lng cao tn t u ra ca my pht c dn bng cp a ln ngten. Nng lng cao tn s c ngten bc x ra thnh sng cao tn truyn trong khng gian. Cc my thu s thu c sng ny. My pht c cc c im nh sau:- Kt cu vng chc, kch thc gn nh hp l. Thay th tng khi d dng, thun li cho vic khai thc, sa cha bo dng.

- My c b phn kim sot s dng mch vi x l v hin th thng s hot ng bng mn hnh tinh th lng LCD.

- B khuch i cng sut cao tn s dng cc transistor bn dn cng ngh MOSFET, khng cn iu chnh khi thay i tn s pht m vn bo m c hiu sut bc x. B khuch i c thit k c d tha cng sut nhm tng tui th cho linh kin cao tn khi my hot ng lin tc.

- My c bo v bi cc ch bo v, khng ch qu p, qu dng, h ti hoc chp ti.

- My c lm mt bng h thng ta nhit, qut ht gi c thit k hp l t hiu qu cao.

- Tiu th nng lng t, hiu sut cao nh s dng cc ngun switching nn di in p hot ng rng, n nh cao.2. Hng dn s dng v khai thc thit b

2.1 V tr t my v iu kin mi trng:

- Ni t my c bo v chng ma, nng, chng xm nhp.

- m bo thng thong, kh ro, iu kin v sinh sch s.

- m bo tui th ca my pht th iu kin nhit v m trong phng t my phi trong phm vi tiu chun cho php: nhit 5 450C, m di 90%.2.2 Hng dn khai thc:

Trc tin cn trin khai vic lp anten ln ct cho ng quy cch k thut. Bc tip theo vn gic cm ni cp pht vi gin ngten. Khi vn gic ni, dng tay vn tht cht, khng cn thy r.

Cp pht c dn xung phng t my pht, cp pht phi dn theo ng cho thng, phi dng dy thp nh c nh vo ct v cc im nu c gi mnh cp khng b va p lm dp cp v ni lng khp ni.

Cp dn vo phng my phi c on chng vng xung ngay u pha ngoi trc khi vo phng my, trnh vic nc ma theo cp chy vo my. Nu cp cn di phi cp tri ra, khng cun khoanh li. Ni u di ca cp pht vo gic ANT ca my pht, vn cht.

Sau kt ni tn hiu ting t u ra ca b trn vo Jack AUD. INPUT ng sau my.

m bo an ton cho my pht, nht thit my phi c u dy tip t. S dng dy cp ng nhiu si tit din ln tip t cho my pht. Chiu di dy tip t ni t my pht n h thng tip t cng ngn cng tt.

Trc khi lp dy ngun v bt cng tc ngun cho thit b, lun kim tra chc chn rng my pht c ni vi dy cp ln anten, nu khng thit b c th s b hng do h mch cng sut cao tn u ra.

* Nguyn tc bt my pht: Ln lt bt t di ln trn

- Lp dy in ngun vo pha sau my. Trc khi lp phi kim tra chc chn in p s dng c ph hp vi ngun in p quy nh ca my hay khng.

- Bt aptomat ngn ngun: n bo ngun 220V AC s sng ng h trn ngn ngun s ch th mc in p xoay chiu hin thi, ng h ch dng xoay chiu ch th dng tiu th ca my. My pht bt u cho cng vic khi ng h thng trong khong 1 2 giy, trn ngn iu khin m (CODE CONTROLLER), n bo ngun 220V AC s sng, mn hnh LCD lc ny cng sng ln v hin th thng bo:

Dng ch ny c ngha b to m sn sng lm vic.

Lc ny ngn khuch i cng sut cao tn (POWER TRANSMITTER), mn hnh LCD cng sng ln v hin th thng bo v in p v dng in mt chiu DC cung cp cho khi khuch i cng sut cao tn v cng sut cao tn:

Sau khong 7 8 giy thit b s hot ng v hin th chnh xc dng tiu th v cng sut cao tn u ra. Khi nu cng tc trn ngn iu khin m (CODE CONTROLLER) bt v v tr TRUYN THANH (n LED tng ng vi v tr ny s sng) ngn iu khin m s to tn hiu iu khin nhy tn t ng ngu nhin a n ngn iu ch (MODULATOR) ca my pht iu khin tn s pht nhy tn v mt trong 4 tn s danh nh mt cch ngu nhin. Nu cng tc iu khin trn ngn iu khin bt v v tr BN TIN (n LED tng ng vi v tr ny s sng) th ngn iu khin m s to tn hiu iu khin nhy tn t ng ng thi s iu khin cho b m ha tn hiu thoi lm vic m ha tn hiu m thanh u vo t b trn. Cc tn hiu ny c a n ngn iu ch iu khin tn s pht v iu ch tn hiu thoi c m ha a n ngn cng sut pht. Khi n LED ch th mc trn ngn iu khin m s sng khong 4 n bo hiu ang pht m iu khin nhy tn cho cc my thu nhy v tn s trng vi tn s s cng tc ca my pht, n LED ch th tn s trn ngn iu ch s chp tt lin tc hin th tn s ang qut. Qu trnh ny ko di khong 45 50 giy, kt thc qu trnh iu khin thit lp tn s cng tc ca my pht v my thu v quy nh r my thu c cng tc ch m thoi hay khng. Sau thi im ny thit b hot ng bnh thng v cc thng s c bn c hin th chnh xc trn ng h, mn hnh LCD v LED.Thao tc pht m lnh khi ng my thu - tng m:

khi ng cc my thu- tng m ch m, my pht phi pht m lnh iu khin ng m tng m my thu. Sau khi my pht sn sng, ta nhn nt ALL nu mun m tt c cc my thu tt c cc v tr. Khi , my pht s t ng gi m lnh m n tt c cc cm thu. Lc ny cc cm thu s m v hot ng bnh thng.Mun m tng cm thu (hoc nhm cm thu), v d ta chn m nhm th 2, nhm 3, nhm 15, nhm 17 ta ln lt nhn cc phm s 0 v s 2, s 0 v s 3, s 1 v s 5, s 1 v s 7 trn ngn iu khin m CODE CONTROLLER. Nu bm nhm s mun xa s va bm nhn phm BACK, khi s xa li mt s va bm trn mn hnh. Nu mun xa tt c nhp li nhn phm CLEAR. Sau khi nhp xong, mn hnh LCD s hin th nh sau:

m cc cm thu (nhm cm thu) va chn c hin th trn mn hnh LCD ta nhn phm PRIVATE, khi my pht s t ng gi lnh m n cc cm thu (nhm cm thu) c chn, cc cm thu ny s c m v hot ng bnh thng. Thc hin tng t nh vy ta c th iu khin m c bt k cm thu (nhm cm thu) no ta mong mun. Nu v mt l do no my pht b tt t ngt, khi bt li my pht phi pht m khi ng li cc my thu. Tn hiu m tn t ngun m nh my c a, my ghi m, radio, micro a vo u vo AUD thng qua b trn. iu chnh nt chit p AUD. LEFT v AUD.RIGHT sao cho khi tn hiu ln nht th c su n LED ch th mc iu ch u sng . iu chnh nm chnh mc iu ch k trn sao cho m lng ln nht m cha b mo (thng l sng khong 4 n).

Lu : Khi thay i ngun m tn (nh i my ghi, i bng...) mc m tn u vo thay i, phi chnh li chit p chnh mc iu ch cho thch hp.

* Nguyn tc tt my pht: Ln lt tt t trn xung di

Khi ht chung trnh, nhn phm STOP trn ngn iu khin m, my pht s t ng gi m lnh tt n tt c cc cm thu (nhm cm thu), khi cc my thu u tt v hot ng ch ch (m bo thun tin trong khi vn hnh v n gin trong thao tc, khi nhn phm STOP tt c cc my thu u tt trnh trng hp qun ch tt mt s cm thu, mt s cm vn m gy nh hng n mi ngi xung quanh). Sau bt aptmat ca ngn ngun v v tr OFF tt in my pht, trc khi ra khi phng my phi h cu dao, ct in ca ton b phng my.2. My thu - tng m.

My thu - tng m c chc nng thu sng cao tn do ng-ten ca my pht bc x ra, gii iu ch, gii m, khuch i m tn v a ra loa.

My thu c th t trong nh, sau khi c nh my thu ta tin hnh ln lt cc thao tc sau:

- Cm ng-ten vo gic ngten trn my thu

- u dy ngun 220V vo 2 u kp ca my thu.

- Vn chit p M LNG ht v pha tri (nh nht).

- Bt cng tc m v bn tri.

- Vn chit p m lng ln t t n khi loa ku va ln, khng b mo.

- Chuyn sang ch m: bt cng tc t v tr bn tri sang bn phi, my thu t ngt ngun cho tng m, chuyn sang trng thi ch. Mun khi ng my thu, phi nhn nt pht m my pht trung tm.

Khi cc my thu c trung tm khi ng bng kho m ri, cc my thu s t ng lu gi trng thi m m khng cn trung tm pht m tip. Khi my thu c t ch m, cc tn hiu l hoc nhiu s khng m my thu lm loa ku c. Trong thi gian pht sng, nu ta tt hoc bt my thu hay chuyn qua li cng tc m, thng hoc in li ca my thu b mt ri c li, ta phi khi ng li my thu bng cch nhn nt START my pht.

Bo hnh, bo tr v sa cha:

Sau mt thi gian hot ng lin tc (thng l vi nm), my pht cn c bo tr, kim tra k lng cc thng s k thut hot ng v c iu chnh li khi cn thit m bo cho my hot ng tt nht.

Khng nn thay i hoc l cho cc thng s ci t sn ti ni sn xut b sai lch (vic ny ch c th thc hin khi c cc thit b o c cn thit v thao tc ng quy trnh).

trnh lm tn hi cho ngi cng nh my pht, chng ti khuyn ngh mt s quy tc sau: Khng kim tra o c cc thit b nu:

- Bn khng phi l k thut vin chuyn su, c kinh nghim.

- Bn khng bit chnh xc b phn no ang c in.

- Bn khng c cc dng c thch hp.

- Bn khng ni ti gi vo u ra ca my pht.

Khi iu chnh v sa cha my pht cn c cc thit b sau:

- ng h vn nng.

- My phn tch ph 1.5 GHz.

- Oscilloscope.

- My m tn s.

- My o cng sut v ti gi thch hp.

- My o su iu ch.

- My phn tch anten.

iu kin bo hnh:

Thit b do Vin in t sn xut, cung cp v lp t c bo hnh min ph theo tiu chun l 12 thng k t khi bn giao, bao gm cc h hng do li cc b phn bn trong. Vic bo hnh c gii hn trong s thay th hoc sa cha cc b phn h hng. Cc li sau y s khng c bo hnh min ph:

- in p s dng sai.

- Hao mn t nhin hoc c, ri rt, try xc

- Sai st k thut khi iu chnh hoc s dng khng ng ch dn.

- Thc hin vic kt ni hoc sa cha my bi mt ngi khng c kinh nghim, chuyn mn.

- H hng do nhim xung st, xung in t bin lan truyn qua ng in ngun.

- H hng do thin tai, l lt, ha hon, st nh

Cc b phn h hng c gi v ni sn xut, thit b s c sa cha sau khi xc nh nguyn nhn h hng v xem xt c c p dng iu kin bo hnh min ph hay khng. Vin in t chng ti p dng ch hu mi mt cch linh ng v rng ri. Tuy nhin, chng ti khuyn ngh khng nn ngi khng c tay ngh cao sa cha my khi c s c, thm ch vi cc thao tc n gin nh thay cu ch hng. Nu lm khng ng, khi s dng sai chng loi cu ch, m trc tin khng xc nh nguyn nhn hng cu ch, c th lm h hi my pht. Khng nn iu chnh cc ci t trc ca nh sn xut, v nh vy c th gy ra cc h hng khc v khng c bo hnh min ph.

MY PHT FM DNG CHO TRUYN THANH V TUYN

My pht FM ny c thit k ch to da trn cc linh kin bn dn v IC cng ngh mi vi tin cy cao.

Cc ch tiu k thut:

1. Tn s : 54 68 Mhz. Nhy tn t ng mt trong 4 tn s ngu nhin mi khi bt/ tt ngun, c th hot ng ch m thoi hoc khng m thoi. 2. Phng thc iu ch : FM

3. Tr khng ra ng ten : 50 4. Cng sut ra danh nh : 100W

5. n nh tn s : 10-6 6. Tr khng u vo m tn : 600 7. Mc m tn u vo : - 6 +6 dB

8. tin nhn: 75 S.

9. di tn danh nh: 75kHz.

10. p tuyn tn s trong di 30 9000Hz: 1dB.

11. Mo hi tng ( THD ) trong di 30 10.000Hz : < 1%.

12. T s tn hiu trn tp nhiu m tn: >55dB

13. Pht x ph trong di tn 54 68 Mhz: < 65dB.

14. nhy u vo m tn.

ng Micro: < 30mV.

ng Audio: < 200mV.

15. ng ten : ch X, phn cc ng.

16. Ngun nui : 180 235V/50Hz.

17. Ch hot ng : lin tc.

MY THU

1. Tn s : 54 68 Mhz. Nhy tn t ng theo s iu khin ca my pht, c th hot ng ch m thoi hoc khng m thoi.

2. n nh tn s dao ng ni : 10-63. Trung tn : 10,7MHz.

4. nhy : 30 V

5. ng ten : ng ten cn.

6. Cng sut m tn ra : > 8W, trn ti 4- 8 Ohm

7. Phng thc iu khin : ng/ ngt theo m lnh t trung tm.

8. Ngun nui : 130 240V/50Hz

9. Ch hot ng : lin tc.

Tiu on 1

STTV tr t my thuM s my thu

1Phng i i trng i i 202


Mun m tng cm thu (hoc nhm cm thu), v d ta chn m my thu ti phng i i trng i i 2, phng i i trng i i 3, ta ln lt nhn cc phm s 0 v s 2, s 0 v s 3, trn ngn iu khin m CODE CONTROLLER. Nu bm nhm s mun xa s va bm nhn phm BACK, khi s xa li mt s va bm trn mn hnh. Nu mun xa tt c nhp li nhn phm CLEAR. Sau khi nhp xong, mn hnh LCD s hin th nh sau:

m cc cm thu (nhm cm thu) va chn c hin th trn mn hnh LCD ta nhn phm PRIVATE, khi my pht s t ng gi lnh m n cc cm thu (nhm cm thu) c chn, cc cm thu ny s c m v hot ng bnh thng. Thc hin tng t nh vy ta c th iu khin m c bt k cm thu (nhm cm thu) no ta mong mun. Nu v mt l do no my pht b tt t ngt, khi bt li my pht phi pht m khi ng li cc my thu.

Nu mun m tt c cc cm thu ta nhn nt ALL trn ngn iu khin m CODE CONTROLLER.

Khi ht chng trnh, mun tt cc cm thu nhn nt STOP trn ngn iu khin m CODE CONTROLLER.

Tiu on 2STTV tr t my thuM s my thu





Mun m tng cm thu (hoc nhm cm thu), v d ta chn m my thu ti phng i i trng i i 5, phng i i trng i i 6, phng i i trng i i 6, phng i i trng i i 7, ta ln lt nhn cc phm s 0 v s 5, s 0 v s 6, s 0 v s 7, s 0 v s 8 trn ngn iu khin m CODE CONTROLLER. Nu bm nhm s mun xa s va bm nhn phm BACK, khi s xa li mt s va bm trn mn hnh. Nu mun xa tt c nhp li nhn phm CLEAR. Sau khi nhp xong, mn hnh LCD s hin th nh sau:






2 Phng i i trng i i 1010
















Phng iu hnh hun luynSTTV tr t my thuM s my thu

1Tiu on trng tiu on 101




5Trng khoa KHXH&NV05

6Phng giao ban khoa KHXH&NV06

7Trng khoa Khoa chuyn mn k thut07

8Phng giao ban Khoa chuyn mn k thut08

9Trng khoa Khoa binh chng09

10Phng giao ban Khoa binh chng10

11Trng khoa Khoa QSP11

12Phng giao ban Khoa QSP12

13Trng khoa Khoa BCHT13

14Phng giao ban Khoa BCHT14

15Phng Chnh tr15

16Phng Tham mu Hnh chnh16

17Phng Hu cn17

18Phng o to18

Mun m tng cm thu (hoc nhm cm thu), v d ta chn m my thu ti phng Tiu on trng Tiu on 1, phng Trng khoa Khoa KHXH&NV, phng giao ban Khoa BCHT, phng Chnh tr, ta nhn vo bng tra m s ca my thu t ti cc v tr tng ng s l : 01, 05, 13, 15 v ln lt nhn cc phm s 0 v s 1, s 0 v s 5 s 1 v s 3, s 1 v s 5 trn ngn iu khin m CODE CONTROLLER. Nu bm nhm s mun xa s va bm nhn phm BACK, khi s xa li mt s va bm trn mn hnh. Nu mun xa tt c nhp li nhn phm CLEAR. Sau khi nhp xong, mn hnh LCD s hin th nh sau:




To m

iu khin

iu ch FM

SET CODES: 05 06 07 08

SET CODES: 02 03

U: 48.0Volt

I: 6.0 Amp

RFWD Power: 100.0 Watt

SET CODES: 02 03 15 17

SET CODES:

M ha tn hiu thoi

To m nhy tn

Khuch i kch thch

Khuch i cng sut

Lc

ngten pht

Tn hiu m thanh

Micro

S KHI MY PHT FM

Khuch i cao tn

Trn

Khuch i trung tn

Tch sng

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