Drake MEQ1000A Multiplexing Hybrid QAM Modulator - Manual (Page 12)

12 Setup and Programming (Continued) / Operation
INT ERL EAVER: Sets t he QAM mo dulato r i nt er le aver. C ho o se amo
ng t he avai la b le s el e ct i o ns base d up o n y o ur system / set to p bo x
requireme nts. Fo r typic al 256-QAM . Di gi Ci p her II CAT V systems,
I128, J1 is t he mo st c o m m o nly used i nter leav e setti ng b ut ma ny
o ther c ho ices are avai lable. T his m e nu do es no t appear i n t he
adjust mo de if t he QAM mo de is A (DVB) as t here is o nly o ne
cho ice i n t he DVB sta ndard. W he n no t i n ad just mo de, t his scree n
wi ll dis p lay t he setti ng i n QAM - A mo des as we ll.
OUT PUT FORMAT : Fo r no rm a l o per atio n, se lect NORM AL. Fo r
system lev e l set up, c ho o se CW to pro vide a CW carrier at t he cent er
f reque ncy o f the o ut p ut c ha n n el f o r use i n leve li ng a system whe n a
QAM p o we r m ete r is no t av ai lab le. T o disable a ll RF o utp ut, select
S T A N D B Y. I n t he CW mo de, t he CW carrier ca n be
meas ured o n a spectr um a na lyzer wit ho ut a need to app ly a
band wi dt h c o rr ecti o n o r it ca n be meas ured wit h a n a na lo g mete r
tune d to c ha nn el c e nter. T he CW p o wer m eas ured wi ll eq ua l t he
c h an n el QAM po we r whe n t he m o d ul at o r is ret ur ned to NO RM AL
o utp ut mo de. Us ua lly QAM si g na ls ar e set 5 dB to 10 dB
belo w a na lo g NT SC c ha nne ls whe n ba la nci ng a s y st e m . T he
PRBS mo des pro vide a pse udo ra ndo m bi nary s eq ue nc e o ut p ut
test sig na l f o r use i n labo rato ry testi ng.
OUT PUT CHANMAP, OUT PUT CHANNEL: Se lect t he desir ed EIA
CAT V channe l o utp ut usi ng t hese t wo me nus.
RF OUT : Se lect t he desired RF o ut p ut sig na l leve l. T he avai lab le
range is bet wee n 45 dBmV a nd 62 dB mV, s e lect ab le i n 0. 5 dB
steps. T he o utp ut acc uracy is ± 1 dB.
SET UP: SDE24
SELECT : T he LEFT a nd RIGHT b utto ns a llo w t he use r to scro ll
t hr o ug h t he e nco der number s f o r eac h e nco der i nsta lle d i n t he
M EQ1000A as we ll as t he M EQ1000A itse lf . Use t he LE FT a nd
RIGHT butto ns to se lect t he e nco der to be pro grammed.
VIDEO: T his me nu e ntry a llo ws the use r to se lect bet wee n SVIDEO
and COM POSIT E video inp ut f o r eac h s e lect ed e nco der.
FOR MAT: Eit he r M PEG2 o r M PEG4 H.264 may be se lected as the
o utp ut f o rmat f o r the s e lected e nco der usi ng t his m e nu item .
Enco der 2 o n a giv e n SDE2 4 has no o ptio n. It is f o rced to M PEG2.
RESOLUT ION: T he r eso lutio n o f the video o utp ut o f each e nco der
may be se lected f ro m this m e nu item. T he c ho ices range f ro m 720
x 480 t hr u 353 x 240 as s ho wn o n t he sof tware f lo w c hart o n page
9.
BRIGHT NESS, CONT RAST, SAT URAT ION a nd HUE: T hes e
menu ite ms all o w t he user to assi g n eac h o f these parameters o f
the o utp ut video va lue s f ro m 0 to 255.
MAX AUD IO IN : T his me nu e ntry a llo ws t he user to set t he
ma xim um a udio inp ut whic h may be i np ut to the s e lected e nco der.
T he c ho ices are 1 Vr ms o r 2 V rms.
AUD IO G AIN : T he a udio o utp ut lev e l ca n be c ho s e n f ro m this
menu item by s ele cti o n o f the appropriate gai n. T he va lues r a ng e f
ro m + 15 dB to - 15 dB. A udio o ut p ut c a n a lso be co mplete ly eli mi
nated usi ng t he ‘M UT E’ selectio n.
AUD IO ENCODER: T he SDE24 i nc ludes a udio e nco ders f o r Do lby
Digita l Ste reo co mmercial e nco di ng (AC3) o r M PEG1 Layer 2 a udio
enco di ng (M P2). I n t he USA, t he ma jo rity o f a p pli cat i o ns wi ll use AC3
b ut if y o ur net wo r k is usi ng A nne x A (DVB) set to p b o xes, t hey
may req uire t he M P E G a udio s el e cti o n. So me T Vs and set t o p b o xes
wi ll deco de eit her mo de b ut be s ure to set t he e nco der to t he mo de
used by ot her pro gr am mi ng o n yo ur syst em to i ns ur e c o m pl ete
c o m p ati bi lit y. T he A U D I O E NCODE( R) m e nu allo ws y o u to select
either AC3 o r M P2. Use t he up/d n arro w keys to to ggle bet wee n t he
two setti ngs.
OPERAT ION - MULT IPLEXIN G T WO AT SC INPUT S
To use t he DT D1000, SDE24 a nd/o r t he ASII mo dules to m ultiple x
two AT SC i np uts, pro ceed as f o llo ws:
1) Co nnect t he o ff -air ante nna, CAT V f eed, o r audio a nd video
(SDE24) o r ASI f eed, to the INPUT A and INPUT B inputs o f the
M EQ1000A. If usi ng t wo RF i np uts t he t wo inp ut co nnecto rs are
availab le i n case t he two RF sig na ls m ust co me f ro m diff erent
ant e nnas o r if o ne sig nal is co mi ng f ro m a cab le system , etc. If
usi ng a co mmo n a nt e nna, use a go o d qua lity two way sp litter to
split t he a nte nna a nd f eed eac h i np ut.
2) P lug t he po wer co rd f ro m the unit i nto t he po wer so urce.
3) Fo llo w t he i nstr uctio ns i n t he pr o gr a m m i ng s e ct i o n abo ve to
set t he c ha nnel map a nd c ha nnel number f o r bo th INPUT
M ODULE A and INPUT M O D U LE B.
4) Set t he QAM S YM RAT E to PRESET .
5) Set t he M ULT IPLEX setting ENABLE D
6) Set t he INPUT B OFFSET to 10. Read detai ls i n pro grammi ng
sectio n to deter mi ne if yo u nee d a no ther va lue.
7) Selec t t he desired M PEG pro grams. (See t he pr evio us
s e cti o n f o r details.)
8) I n t he PSIP me nu, se lect BASIC M GT VCT f o r no w, t his may
be c ha nged later. See pr o gr a m mi ng s e cti o n f o r detai l.
9) I n t he VCT T ABLE menu, select T VCT .
10) I n t he M AJOR C H A N N E L m e nu, se lect O U T P U T CH ANNEL.
T his may b e c ha nged later.
11) Fro m t he QAM M ODE menu, set t he QAM mo dulato r to
QAM -256B fo r use i n a DigiCi p her II e nviro nm e nt. If DVB, use
QAM -256A instead .
12) I n t he QAM S YM RAT E menu, se lec t PRESET .
13) Set t he INT ERLEAVER to I128,J 1 if in a DigiCi p her II
envi ro nm e nt. T here is no i nter leaver m e nu whe n t he QAM
mo de is set to A (DVB).
14) Set t he OUT PUT FORM AT to NORM AL.
15) Set t he OUT PUT CHANM AP and OUT PUT C H A N N E L to
the desir ed EIA CAT V o utput c ha nne l.
If the s e c o nd pro gram is bei ng i np ut to a ASII M o dule vi a t he ASI
inp ut i nst ead o f a DT D1000, the sa me steps app ly e xcept t ha t
ther e wi ll b e no paramet ers to set f o r the ASII M ODULE.
SET TOP BOX MAPP ING
W h e n s etti ng up a pro gram map f o r yo ur set to p bo xes to i nc lud e
off -air c ha nne ls t hat are m ulti pl e xe d by t he M EQ1000A be s ure to
inf o rm the pro gramm er t hat t he M PEG pro gram numbers f o r the
pro grams co mi ng i n t hr o ug h INPUT M ODULE B o r ASI B have
bee n o ff set by the a m o unt se lected i n t he INPUT B OFFSET
menu. As a n e xamp le: If inp ut A is pro vidi ng a c ha nne l wit h
M PEG pro grams 1 a nd 2 i n t he stream a nd i np ut B is pro vidi ng a
cha nne l wit h M PEG pro grams 1, 2, 3, 4, a nd 5 i n t he stream, a nd
the INPUT B OFFSET is set to 10, t he n t he ne w o ut p ut sig na l wi ll
co ntai n M P E G pro grams wit h pro gram numbers o f 1, 2, 11 , 12,
13, 14, a nd 15. If the set to p is no t lo o ki ng f o r the rig ht pro gram
number, y o u wi ll no t receive a ny video !