Thomas Morzinck. DO 0 OT
VHF COM MU
NICA
TIONS
2189
Oscilloscope Line-An alyz
The unit to be de,crlbed
and dl' play 01 any I lnvle Une on a I tandard
o
lcillo
scope
.The
eecre..
ha"
lng
Ihe
ena
ble
clrcullIIdel lg
I landard oulpu
l lhe,elec
nedlor
lle"
el.
"
Ideo
1.
INTRODUCTION
The IaSl 10 years
prOC8MlO'iJ
e"eel
add,hONII onlormahon SIgnals. which are nol
,nlended
creasing
Broadcasl
TEXT and o
Illms add
VISIONS (2) technique The SIS technique
(Sound"n·Sync) has been decided upon lor the
IransmlSSlon 01hlgh·hdelily sound. also dala and
marker SIgnals canbeencountered
All these nono(llsplayed SIgnal. are
blanking and
IIgnal
normal oscdloBCOptfs Irace For thiS laetllty. a
SynchroniZing Irame
. lhe 8lTlefglng meo.a has len ,Is
upon
tor
leIev1S1On
l'Onal.
and cannot r&!lably be evalualed on a
120
on
the de\oelopmelll of
the VIdeo SIgnal The
"'SlbIe display . II everymore In·
th.r
.ynchrOfllllng
oIlers liS VIeWers VIDEO-
Similar servICes and VHS rent-
accord"'9
musl
IranSlTUS5IOl'I
10 the MACRO-
cemee
portiOflS01lhe vcec
be prepared whICh IS
In the
able 10
tion
grammablemanner from an
2.
PRINCIPLE
A synchrOf'llztng pulse
to
pnrnes
dala
Cll'CUIII5
COU"I. the honzonlal
of
preselecled poonlln
lemal
enables the presentation
01lines tooccur alwaysal the same polnt In lime
leg
The number 01displayed lines ISseleeled on lhe
OSCilloscope by Ihe hor,zonlal
The displayed time duration lor only one line
(64 ,",s) IS100 short lor Iha Ilace 10 have the requned b
co"
ma.,
A"
'''.
Should &everal II
lime
er
Accessory
be
tflggered In a cenn.te and pro-
edernal
source
CIfC\III
. wtIlch has
!he
desifed
Y1deo
Iflpul
SIgnal
(level
the
~
".
and Irame
Star1ed
kom
Ingger Input 01 an OSCIlloscope This
aller the 10th
"lliance
lroi ot thl! OSCilloscope mUSI be Increased 10
mum andior the amblenl hghhng reduced
Oscilloscope
.
Ihe
II".}
and therefore the brilliance
hood
""
Irace bnIkance tnereases propor.
pulses
the hall
kame
pulses
lime
and produces , al a
. an Impulse torthee.·
01.
Slnglellneor
speed
would alsobea"
be
displayed at lhe same
been
pes
neg ).
A counllng
PIcture which
sertel
control
adva,,-
VHF CO MMUNIC ATlON S
2189
tlonally USing a proprietary small service oscilloscope. a Single. complete line can be made
VISible:
clearly
are
dlSll11Cl
prinCipleISshown clearty in fig. 1
groups of about 10 to 15
even with a small screen size, The
uoee
3.
THE CIRCUIT
There have already been several Ci
lished (3) . (4). whiChmay also be claSSifiedInto
voec.
synchrOOlZlng
There are venous poSSible solutions The TBA
920, used here. and the TTL series
v.eee-
srqnCI
or digital
comcos
rCUits
.
les
pub-
are not
I'
stare-ot-rne-arr component s bul they are unproblematical In their
probably already In
wailing lor something useful to do (fig. 2)
Highly Integr8ted solutions may be more elegant
but do not allow the same soft ot control over all
lhe
Individual parameters. For SIgnal sources
do not possess the normal synchroniZing
whiCh
pulses (satellite teleVIsion), an
COflsl
,tulion would be indispensable,
3.1. Vi
deoAmplll
The
veee
ampillier musl match the Inpul Signal
the
follOWing
to
video Signals.egfrom a Video recorder (1 Vcr!
75 II FBAS pos,), can be processed directly by
Oscillo
~\~
I
,
sync.- pulse cucurte Standard
scopr
I,
'11'_
..'
employmenl and are
the amateur's
ier
Junk·bo~
e~tern81
re-
rAl
~
C>
C-
'11.......
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OOOO
T
0"
LA=:
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~ ~
000 600l(1 -(J' 00 90lBt ·B41
Z@d@n
vor..chIIL,n,
Yo"
'I I
0 ...•
(oun
lfr
I I I
LA=:
prnt
! IB(OI
1r
! !
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,
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.,
.
~
"'91'"
.'
~
F
ill
. 1:
Prlnc lp•• 01e vl!M'o
liM enelYler
121
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