MSI / 55 - lub davhlau ya nyob twg qub rau kev xaj khoom los ntawm ib ceg hauv khw hauv nruab nrab

Cov cuab yeej pom ntawm KDPV tau npaj los xa cov xaj los ntawm ib ceg mus rau lub khw hauv nruab nrab. Txhawm rau ua qhov no, nws yog qhov yuav tsum tau ua ntej nkag mus rau cov lej xov tooj ntawm cov khoom xaj rau hauv nws, hu rau tus xov tooj ntawm lub khw hauv nruab nrab thiab xa cov ntaub ntawv siv lub hauv paus ntsiab lus ntawm kev sib txuas ntawm acoustic modem. Qhov ceev ntawm lub davhlau ya nyob twg xa cov ntaub ntawv yuav tsum yog 300 baud. Nws yog powered los ntawm plaub mercury-zinc hlwb (thaum lub sij hawm nws yog ua tau), qhov voltage ntawm xws li ib tug lub cev yog 1,35 V, thiab tag nrho cov roj teeb yog 5,4 V, yog li txhua yam ua hauj lwm los ntawm 5 V fais fab mov. Qhov hloov pauv tso cai rau koj xaiv peb hom: CALC - lub tshuab xam zauv tsis tu ncua, OPER - koj tuaj yeem sau cov lej thiab lwm cov cim, thiab xa - xa, tab sis thaum xub thawj koj tsis tuaj yeem ua suab nrov. Nws yog qhov tseeb tias koj tuaj yeem txuag cov ntawv thiab xa lawv, tab sis li cas? Yog tias peb tuaj yeem nrhiav tau, tus sau yuav sim ntsuas lub suab qhov program no, lossis txawm li cas los hloov lub davhlau ya nyob twg rau digital hom kev sib txuas lus amateur.

Cov cuab yeej los ntawm sab nraub qaum, lub taub hau dynamic thiab roj teeb compartment pom:

Qhov tseem ceeb tshaj plaws - yuav ua li cas nyem lub suab tawm ntawm lub davhlau ya nyob twg - tus sau tau kawm los ntawm tus neeg uas ib zaug muaj tib lub davhlau ya nyob twg. Koj yuav tsum nkag mus rau qhov pib code, thiab tom qab ntawd koj tuaj yeem nkag mus rau cov khoom. Peb txav tus hloov mus rau OPER txoj hauj lwm, tsab ntawv P yuav tshwm sim. Nkag mus rau 0406091001 (tus sau tsis piav qhia qhov no yog dab tsi, tej zaum tus neeg siv lub npe) thiab nias ENT. Tsab ntawv H tshwm, sau 001290 (thiab qhov no yog tej zaum tus password) thiab nias ENT dua. Tus lej 0 tshwm tuaj. Koj tuaj yeem sau cov ntawv.

Tsab ntawv yuav tsum pib nrog tsab ntawv H lossis P (tus sau ua yuam kev ntawm no, tsis muaj tsab ntawv P ntawm cov keyboard, muaj F), ces muaj cov lej. Tom qab nias tus yuam sij ENT, ib kab zoo li 0004 0451 tshwm, qhov twg nrog txhua kab lus txuas ntxiv thawj tus lej nce thiab qhov thib ob txo qis, uas txhais tau hais tias qhov no yog cov xov tooj ntawm cov neeg nyob thiab cov hlwb dawb, feem. Koj tuaj yeem siv cov khawm xub txhawm rau rub los ntawm cov ntawv nkag, tab sis tus sau tsis paub yuav rho tawm lawv li cas (uas txhais tau tias tus yuam sij CLR tsis pab). Nws tsis yog hais tias yuav qhia qhov ntau npaum li cas rau txhua kab lus.

Tom qab nkag mus rau cov ntawv, koj yuav tsum txav mus rau qhov chaw SEND thiab nias SND / = yuam sij. Cov lus SEND BUSY yuav tshwm rau ntawm qhov taw qhia, thiab kev sib kis yuav pib:

Lub suab nrov nrog zaus ntawm 4,4 Hz suab rau 1200 s. Tom qab ntawd rau lwm 6 s - 1000 Hz. Tom ntej no 2,8 s yog siv xa cov teeb liab modulated, ua raws li los ntawm lwm 3 s - dua transmitting lub 1000 Hz suab.

Yog tias koj saib ze ntawm lub spectrum, qhov tseeb, tsis yog 1000 Hz koj tau txais 980, thiab es tsis txhob ntawm 1200 - 1180. Tus sau tau sau ib daim ntawv WAV, nruab qhov kev pab cuam saum toj no ("txiv neej" rau nws. no) thiab khiav nws zoo li no:

minimodem -r -f msi55_bell103_3.wav -M 980 -S 1180 300

tshwm sim:

### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 kev ntseeg siab = 2.026 ampl=0.147 bps = 294.55 (1.8% qeeb) ###

Nws zoo li Tswb 103 modulation. Txawm hais tias feem ntau muaj 1070 thiab 1270 Hz.

Puas yog cov frequencies ntawm lub davhlau ya nyob twg "float deb"? Tus neeg sau tau kho cov ntaub ntawv WAV kom qhov ceev tau nce 1,8%. Nws muab tawm yuav luag 1000 thiab 1200. Tshiab tso tawm ntawm qhov kev pab cuam:

minimodem -r -f msi55_bell103_4.wav -M 1000 -S 1200 300 -R 8000 -8 -startbits 1 -stopbits 1

Thiab nws teb tias:

### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 kev ntseeg siab = 2.090 ampl=0.148 bps = 299.50 (0.2% qeeb) ###

Hauv ob qho xwm txheej, qhov tshwm sim yog lub ntsiab lus, txawm tias qhov yuam kev. Tshooj xov tooj H12345678 tau "rub tawm" los ntawm lub teeb liab raws li H��3�56�� - cov lej uas peb tuaj yeem tsim tawm yog nyob rau hauv lawv qhov chaw. Cov khoom siv hluav taws xob tuaj yeem muaj qhov lim dej tsis zoo, ua rau 50-Hz keeb kwm yav dhau los ua kom pom ntawm lub teeb liab. Qhov kev zov me nyuam qhia txog qhov tsis muaj kev ntseeg siab (kev ntseeg siab = 2.090), uas qhia tau tias muaj teeb meem cuam tshuam. Tab sis tam sim no nws tsawg kawg yog qhov tseeb tias lub davhlau ya nyob twg xa cov ntaub ntawv mus rau lub khw hauv nruab nrab lub khoos phis tawj thaum nws tseem muaj.

Tau qhov twg los: www.hab.com