Motorola R2550 Service Manual

DISPLAY 
ZONE
SOFTKEYS :ill$S[! 
iloJe:slfrl*DAnD
req  : 
?8.  STSS  lslz  Ih 
: 2 
62  kllz ftF 
lontro!:
Fresei:  -- rtu
lfr
l{k
8dE AT{I
131.8  llz
l.t$i  U x
*slABt0
g\c86  U x
:- 
35 
Hz  InPut  Luli  91 
uil Freqi  fl?8.8tT0
Attenurl  i 
on:
ilsn  SF Ini
lhdulat  isn 
T
Audio  Suri l.StS U 
Pk
Fixrd  Lkllz: t.8t8  U 
x
Sqnthi  8.?95 
U 
x
Fomrl  $el:  Pt
tnde:  l?3456
txternal  I
Figure  3-1. Screen  Zone Arrangement AUDIO 
CONTROL  ZONE
Displeg:
f,TItlt 
st{pt
Trigger:  fiUTtl.
Iris 
Lul:Stitrel...

Control 
the 
cursor  location  and input  informa-
tion  by:
.  Using  the CURSOR  ZONE 
keys 
to move
the  cursor  among  the 
three  zones.
.  Using  the 
CURSOR  POSITION  keys 
to
move  the cursor  from field 
to field 
within  a
zone.
.  Once  at 
the 
desired  field, 
use either  the
TUNING  knob 
or the  numeric  keys  to  enter
numeric  information. 
Use the softkeys  for
other  menu 
selections.
3-2.1  Expanded 
Display
Some  functions  have 
the ability  to 
expand  their
contents  and...

l.{heration 
of fhis unit is done  primcilc 
thrsugh the use  of
sqftkegs  located imdiatelg 
beltn the displeg 
srreen.
Thess  kegs along  nith the 
tU[St]B  PIISITIIHi 
kegs lncaled
*u  fhe 
risht  of lhe 
screen  prouide 
fsr ihe entrg  of test
requir*nenls  rnd the selerfion 
of data 
to be 
displaced.
2.  tach 
highl  ighted 
cursor  lsraf ion has 
its orn  unique-mnu 
of
selectisns  displaged 
in boxes 
imediafelc 
rhoue th* softkegs.
$il+lu  push 
the keg  beloH 
ihe 
bax to 
mke the  seleclion....

3-4 
WARI\INGS
The  system  provides 
warnings  for 
the  following
operating  conditions, 
which 
are considered
detrimental  to 
the  proper 
functioning  of the
Analyzer:
.  RF  Overload
(Input  level to monitor  too  great 
for ac-
curate  measurement)
.  Recalibrate
(Indicates  that the 
units  internal 
tempera-
ture  has 
changed  more 
than 10o 
C from
where  it 
was  last 
self-calibrated.  This
may affect  the accuracy  of the  generator
output  level,  monitor 
input 
level below
+20  dBm,...

3-5 
PRIMARY 
OPERATING  MODES
Select  the  operating 
mode 
by placing 
the cursor
in  the  RF 
Control:  field 
in 
the RF  zone. 
Use
the  desired  softkey  to 
make 
selection.  Primary
operating  modes 
are: MOMTOR, 
GENERATE,
and  DUPLEX. 3-5.1 
MONITOR 
Mode
The  Monitor 
mode (figure 
3-4) provides 
the
units  test receiver 
function  which is used  in 
the
testing  of radio 
transmitters. 
It is 
capable  of
monitoring  RF input 
through its 
antenna  or a
direct  connection  to 
the transmitter...

mode 
are located 
within the RF 
zone  when
MONITOR  is 
first  selected.  The 
specific  entry
fields  are 
as follows.
Preset This  field 
allows  one of the 
twenty  possible
preset  monitor/generate  frequency pairs 
to
be  selected.  Frequency 
memory presets 
are
programmed  in the  memory 
screen as 
dis-
cussed  in paragraph 
3-8.5. When 
a preset
number  is 
entered  in 
this  field, 
the monitor
and  generate 
frequencies  stored under that
number  are used  by  the 
analyzer  for moni-
tor...

3-5.2 
GENERATE  Mode
The  GENERATE  mode 
(figure 
3-5) configures
the  Analyzer  to 
generate  an 
RF 
signal  at 
a
controllableoutputr.rtoprovide.forawide range  of 
receivsr 
*nt  Muttiple 
internal 
and extemal 
mo 
dulation  signals 
c 
an  be  simlrltaneous-
ly  impressed  on 
the  tuiitt  frequencyto  gensrate
ffit**  signul 
for 
servicing  Signals 
from
400  kHz  to qggqgig 
vltr rnray 
be generated
L.*]*oency  is 
set  in 
100  Hz increments
Figure  3-5. 
Generate  Mode
tieter:BF 
DI$PLfiV...

Specific 
controls 
which further 
configure  the
GENERATE  mode are 
located 
within the RF
Control  zone 
when 
GENERATE  is 
first 
selected.
The  specific  entry 
fields  are  as  follows:
Preset The  preset 
function  is the  same  as in 
the
MOMTOR  mode.
B/W Selects  either 
wide or naffow 
bandwidth  of
the  unit  via 
softkey  selection.
Freq Enter  the 
desired  generate 
RF frequency
using  keypad 
or tuning  knob.
Output  Lvl
Selects  generator 
output level 
in 
0.1  dBm
steps  over the...

3-5.3 
DUPLEX 
Mode
The  DUPLEX  Mode  (figure 
3-6) provides 
a
simultaneous  RF generator 
output that is 
offset
in  frequency  from 
the monitor 
center  frequency
and  fully 
adjustable  in 
output  level. 
This capa-
bility  provides 
for servicing  full 
duplex  radio
equipment  as well 
as repeaters 
and radios 
opera-
ting  with 
offset  transmit 
and receive  frequencies.
{ater:ftF  0ISPIA?  liode:$TAlSfiB$
llun  Fre{:  161.558F  l#lz Daui 
9,8? kHz
Freq  tmi-  l..88kllz  Input 
Lul:-  ?4.3...

Specific 
controls 
which 
further 
configure  the
DUPLEX  mode are 
located 
within the RF
Control  zone 
when 
DUPLEX  is 
first 
selected.
The  specific  entry 
fields 
aro as follows:
Preset The  preset 
function  is 
the  same  as in 
the
monitor  mode. 
However,  when 
the Duplex
mode  is 
activated  and 
a preset 
number  is
entered  into  this 
field, the duplex 
offset fre-
quency  will be automatically  calculated to 
be
the  difference  between 
the 
stored  monitor 
and
generate  frequencies....