Motorola R2550 Service Manual

							3-5.4 
TRACKING 
GENERATOR  Mode
(Option)
The  TRACK 
GENERATOR  mode (figure 
3-7)
sets  up the  units 
signal  generator 
in a 
sweeping
mode  for use  with  the 
optional Tracking  Genera-
tor  display.  This provides 
a valuable  capability
for  measuring 
and servicing 
a wide 
variety  of
RF  filtering 
and combining  networks.
To  operate  the 
Tracking 
Generator,  simply select
TRACK  GEN via 
softkey  in 
the  RF 
Control:
field  in 
the  RF 
Control  zone. 
Connect  the 
GEN
OUT  port 
to the  input 
of the  network 
under test.
tletsr:BF  DISPLAF  t{ode:$Tfi}lD*fiDConnect  the 
output of the  network 
under  test  to
the  ANT  port. 
Be sure  to 
activate  the ANT  port
thru  the Mon: 
field  in the RF 
Control  zone. 
If
input  attenuation  is needed 
as part 
of the 
mea-
surement  procedure, 
20 or 40 
dB  attenuation
may  similarly  be selected  thru 
the Mon:  field
in  the RF  Control  zone.
The Tracker  display is 
selected  thru softkeys  at
the  Display: 
field of the  DISP  zone 
at  the  left
center  of 
the  screen.  The 
display  is 
a 10 
dB/div
[f  tontrol  : rlillfliliFll]
fing:!lT0  kHz
[en  Freqi225.T098  ttlz
tbtput  Lul:-$88.1  d$r
f*n  SF lhtt:  trtl
lftn:  t  dB 
f,l{t
fiudio  $ur:  0,880 U pk
Fixed  lkHzl 
8.988 U
$cnth:  i.795 U x
Fomat  Sel i  FL
131.8  Hz
t,8gg  U 
x
tode  : l23tl56?SgtltfiBtD
External:  8.09[ U x
lnput 
Lul:-  93.5 d8r
[en  Fceq:  225.t03t  l$z Lul: 2I.36 
uU
Disphg:  IBeff fff[ReTffi
-/ts -60
Input  Lu
(dBr)
-8t
-lt0
Figure  3-7.  Tracking  Generator Mode
22 
						

							log 
scale.  By 
adjusting  the generator 
level and
selecting  20 
or 40 dB 
of input 
attenuation,  the
usable  measurement 
range is 
approximately  100
dB  at frequencies  below 500 
MHz 
and 80 dB
above  500 
MHz.
All  adjustinents  of 
center  frequency,  frequency
range  and generator 
level are made 
thru the RF
zone  at the  upper  right 
of 
the  screen.  The
TUMNG  control is 
especially  useful 
in 
tuning
center  frequency 
and generator 
level. These  may
all  be adjusted  as 
follows,  thru 
softkeys  or
numeric  entry, for 
the 
desired  display, 
depending
on  the  type  of network 
being tested.
Rng Selects  the RF 
frequency  range 
over which  the
generator  will sweep.  These  are 
expressed in
r  full 
screen  deflection  ranges 
that 
are select-
able  via 
softkeys.  The 
sweep  rate 
of the
tracking  generator 
is fixed 
at approximately  50
ms/sweep.
Cen  Freq
Selects  the 
center  frequency 
of the  Tracking
Generator  display. 
See 
the 
GENERATE  mode
for  more detail  on 
frequency  entry.
Output  Lvl
Refer  to GENERATE  MOdE.
Gen  RF Out
Refer  to GENERATE  mode.
23 
						

							3.6 
AUDIO/MODULATION 
SYNTHESIZER
The  Audio 
zone located 
at the  lower 
right 
of the
$creen  is 
used  to 
control  the multi-purpose 
audio
synthesizer  section 
of the  unit. 
Signals  gener-
ated  by the 
audio  synthesizer  are coupled  in-
ternally  to the  generator 
modulation  input 
as
well  as to 
the  MOD 
OUT front panel 
connector.
In  the  GENERATE  and DUPLEX  modes,levels
entered  in 
the  Audio  zone 
are 
shown  as  modu-
lation  (either 
deviation  or Vo  ANI). 
The 
com-
posite  sum of modulation, 
only for 
those
modulation  sources enabled,  is 
displayed  at  the
top  of the  zone 
at  the  Mod 
Sum:  location.
In  the  MOMTOR 
mode, levels 
entered  in 
the
Audio  zone 
are shown  as peak 
voltage  values.
The  composite  sum of 
the  voltage value  (only
for  those  modulation 
sources  enabled)  is 
dis-
played  at the  top 
of the  zone 
at the  Audio
Sum:  location.
Each  of the  following  modulation 
signals has 
a
cursor  field  for 
entering its 
desired  level. 
Use
the  keypad 
or TUNING  knob 
to enter  the de-
sired  level.
An  additional  cursor field, 
adjacent  to 
each  level
entr],  is 
used  to enable 
or switch  each selection
on  and  off 
using  softkeys.  This 
field 
is located
at  the  extreme  right 
side of 
the  zone.  There 
are
three  possible 
conditions  for 
this softkey  selec-
tion.
1.  CONT  activates  continuous 
ON condition,
or  continuous  cycling if 
a sequence  has
been  selected.  A 
- symbol 
is 
indicated  at
the  extreme  right, 
adjacent  to 
the  level  to
indicate  continuous  ON. 2. 
OFF  switches  off the  modulation 
source.
Off  is 
indicated 
by an X 
at the  extreme
right,  adjacent  to the  level.
3.  BURST  provides 
a single  timed  sequence of
modulation  only for 
DTMF, 
TONE A,
TONE  B, 
and  GENERAL  SEQUENCE.  A
single  burst  sequence is 
shown  by the  x
symbol.
For  DPL,  select the 
START  DISC  TN (*)
softkey  to produce 
a continuous  disconnect  tone.
(Select  CONT then * 
softkeys  to simulate  a
complete  DPL 
transmission  with 
disconnect
tone.)
The  composite  sum  at the 
top  of the 
zone  will
not  indicate  the burst  condition.  To 
set the
composite  level 
to include 
bursts of 
signaling,
temporarily  select 
CONT  for 
those  modulation
sources  which 
will be  burst  enabled.
3-6.1  Fixed 
l kHz
The  Analyzer  has 
a fixed 1 
kHz modulation
source,  which  can 
be selected  independently
from  the other  audio  synthesizers. Level 
control
and  on-off  selection  is 
described  above.
3-6.2  Synth
Level  control  and on-off  selection 
are  selectable
via  softkey  selection.  The 
synthesizer  function
encodes  a broad  selection  of 
signaling  formats,
which  are softkey  selected 
through the  Format
Sel:  field 
adjacent  to Syth: 
level field.  Use
24 
						

							of 
the  more 
sof-tkey  accesses  three 
different
menu  levels 
for 
the  following 
signaling for-
mats.
PL  (figure 
3-8)
This  softkey  selects Motorola 
Private-Line
tone  coded  squelch 
signaling. This 
selection produces 
two additional  fields 
on the 
line 
below
the  Format 
Sel: field.  The first 
allows  for
softkey  selection  of 
either  frequency 
or code
entry.  The 
second  is 
the value 
corresponding  to
the  frequency 
or code.  Valid PL 
codes  are
found  in Appendix  B. All  frequency  entries 
are
accepted,  but only valid 
codes can  be  entered.
I!I$PLAY llodr:STAI{thffD
Een  Freq: 
l25.EEBS  l$lz 
Lrl:?g?.IE  uU
Displagl  lltffi,LfiTI$l  S[0PE
Trigger;  filll{l  Trig 
Lul:5[l{rel  lul}
Horizi  tB8 us/div  Positioni  {*}
{|ert  i 
cal  i
1  kHzr
dis f,F  f 
ontrol:  GEffiEATE
Presef  : -- 
B/tl: tS
Freq  : 
225. 8f,98  l$lz
tbtput  Lvl: -858. 
t dEr
6en  fiF 
0ut!  RF I/0
llndulst  ion Tupe 
I Fll
l{od  $ur: 
2, i0  kHz
Fixed  lkHzi l.0t kllz -
Scnthl  0.8E kHz x
Fsrmt  Sel: 
ff!
FSEQ:  131. S llz
0Tlf  : 
1.89 kHz x
tode  : 123456?S9*8*AEtD
Externa!:  8,89 kllz x
PL I}PL npt
IISJERT T0tf 
fiTISG  B mnf
Figure  3-8. PL 
Format 
Selection
25 
						

							DPL/DPL 
INVERT  3.6.3 DTMF
This  softkey  selects standard 
or inverted  Provides 
a means  for 
encoding  DTMF
Motorola  Digital Private-Line 
coded squelch.  (Dual-Tone 
Multi-Frequency)  signaling for
A  single  cursor  field 
is located  below the  testing telephone 
interface 
systems.  Enter  level
Format  Sel: field 
for 
entry  of 
code.  Only  as described above  and enter  Cods: 
in the  field
valid  DPL 
codes  should 
be entered  per 
Appen-  immediately 
below the DTMF: 
field.
dix  B.
3-6.4 Bxternal
TONE  A/TONE  B 
Used to 
set  the  level 
and enable  externally
This  softkey  selects either 
of two  continuous  applied  signals from 
both the 
MIC 
and the 
EXT
audio  tones.  Tone frequencies  may 
be entered  MOD IN 
front  panel 
connectors.
from  the Freq:  field.
NOTE
GENERAL  SEQ (ngure 
3-9)  In 
the  case  of external  signals  applied
This  softkey  selects a free-form  l0-tone 
se- to 
the  EXT  MOD connector,  the ac-
quence  encoding  which has 
full  flexibility  to  curacy of this  level  displayed  is  depen-
enter  unique  frequency 
and time  duradon  for 
dent on applying  a 
fixed  signal 
level 
of
each  of the 
l0 tone  slots.  The  single 
field  I 
Voo 
Q Vpkil 
to the 
EXT  MOD  IN
below  the Format 
Sel: field 
is 
used  to 
enter  connector.
the  frequency  code 
sequence. An 
expandable
display  table is 
selectable  by softkey  to 
allow
entry  of frequency 
and time  duration  datr.
Frequencies  and  durations 
are tabulated  corre-
sponding  to 
a given 
code number  (i.e. 
If,2),
31,  etc.).
The  frequency  code  sequence can be 
entered
in  the  expanded  display 
table as well  as in 
the
Audio  Control  zone. The 
clear  lo end 
softkey
allows  all 
code  numbers  entered  in 
the  Code
.sequence: 
field to the 
right 
of the 
cunent
cursor  position 
to be  cleared.
26 
						

							DISPLAY
itode: ST0IIDABD
[*n  Freq:  2t5.899S 
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StgPE
Trigger:  f,[T0  Iris 
Lul:5S8trel  lul]
llnrirl  2ET us/diu 
Positidni  {t*
ilertirrl: t kllz/
div ffF 
fonlrol:  fflfRAIE
Presel  I --  gfll: 
tS
Freq:  125.S[8t 
illz
ttutrut  Lul r -858. 
I 
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lhdulat  ion I
llod  Sur! 
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Fomai  Sel: 
$UNg
fode:  01e3456?89
DIIS:  0,tB klh 
x
tsde  : 12345S?S9*S*AB[S
fxternal:  9.08 kllz 
x
iLfIHRL fFtr displar
falle ilofg
$gnthesizen  Encode Fornat 
S*l tltl 
SE0
lode  $equencei  ltl3456?89
(Sare  code es in Audio  fontrol]
Freq  hlr
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Figure  3-9.  General 
Sequence  Mode 
Select
27 
						

							3-7 
METER  AND 
DISPLAY 
In the  MONITOR 
Mode, the following  data  is
The  display  of metered  data 
is presented 
both  displayed in the  RF  Display 
area.
numerically  and graphically 
within the Display
zone  in 
the  left  portion 
of the 
screen  (figure 
Mon Freq
3-10).  This zone 
is divided  into 
two  separate  Center frequency 
of the 
radio 
under  test 
as
display  areas:  Meter 
area and Display 
area.  entered in 
the  RF 
Control  zone.
3-7.1  Meter 
Freq Err
Select  a measurement 
display from 
the follow- 
This area displays  the  plus 
or minus  frequency
ing,  using  softkeys  from 
the Meter: 
cursor  offset (error) 
of the  received 
carrier relative 
to
field.  the  center frequency 
entered above.
3-7.1.1  RF Display 
DevlToAM
This  area displays  the RF 
test  data  for 
the  radio  Indicates 
the modulation 
level of the  received
under  test, 
subject  to the 
mode 
selected  carrisr, 
dependent  upon  the  modulation  type
(MONITOR,  GENERATE,  DUPLEX, 
or option- 
selected in 
the  RF 
Control  zone.
al  TRACK 
GENERATE).
NoI€: THE R.2550 
ONLY OPEBATES 
IN THE 
STANDABD  MODE
ffi smroon/
f,en  Freq: 
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Di  splag  : }frilllrtf,Tl{H  SttPE
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diu fiF 
fontrol: 
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Pnesel:  -- Bru: 
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Attenuationi
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In:
ltudulalion  TtdB
AI{T
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Fixed  lkHz: 2.8t  kHz -
$cnih:  t.Sl kHz 
x
Fomal  Sel:  0PL
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tode:113456?9gtts*AS[D
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kllz x
ill
}ISPLfiY PSE$ET
stfttl AT
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u{LTS IHT
DIST EIT
DISI sIltftD
tol.e
Figure  3-10.  RF 
Display  Zone
28 
						

							Input 
Lvl
Displays  the 
signal  level 
received 
at the  select-
ed  front  panel 
connector.  This 
area  displays
transmitter  powsr 
for high  levels 
of input  as
well  as lower  levels 
of field 
strength.  Data 
is
displayed  only 
for on 
channel  carrier fre-
quencies.  A single  cursor  field 
at this  location
allows  selection  by 
softkey  of either  micro-
volts/watts  or dBm  units 
of display.
When  the 
GENERATE  mode 
is 
selected,  the RF
Display  area shows  generator 
center frequency
as  well 
as generate 
level per 
the RF 
Control
zone  entry.  A 
single  cursor 
field 
at this  location
allows  selection  by softkey  of either  millivolts/
microvolts  (mViuV), 
dBu, or 
dBm  units 
of
display.
When  DUPLEX  mode 
is 
selected,  the RF Dis-
play  area reflects 
a combination  of 
the  monitor
and  generator  data, 
as described  above. 3-7.1.2 
Preset 
Scan
The  R-2550 
analyzer  provides 
a preset 
scan
function  in  which  the preset 
monitor  frequencies
stored  in 
the  RF memory 
are continually
scanned  (figure 
3-11). The 
analyzer  scans
through  the preset 
frequencies,  stopping 
and
dwelling  on a 
channel  whenever 
the receiver
squelch  is 
broken.  When the receiver 
becomes
squelched  again, 
scanning  resumes. 
All20 preset
monitor  frequencies, 
or a 
subset  consisting  of 
a
continuous  block  offrequencies,  can 
be  scanned.
When  no signals  are  detected,  the analyzer 
scans
through all  20 preset 
frequencies  in 
less  than  ll2
second.  If 
the  number 
of preset 
frequencies  to  be
scanned  is reduced, 
the scanning  process 
is even
faster.  RF 
signals  to 
be  scanned  can 
be input
from  either  the ANT 
or RF UO  ports.
While  the 
analyzer  is 
scanning,  the Freq:
fields  within  the meter  zone and  RF 
Control
zone  indicate  scanning.  When 
a carrier  is
tloton:SE5[trIlE[I  thde:$TeffififiD
Freqi  -scanninl-  l*h Dev: 
----- 
kHz
Preset  lfu:  InPut 
Lul:----.-  d8r
Lo  Presetl  f,S Hi 
Presei:  tB
0isplag:  t{SULfiTt{Fl  St0Pt
Trisger:  SllT{}  Iris 
Lvl:5t[{rel  1u1}
Hurizi  59 
us/diu  Position:  (tt)
Uert  i 
ral  :
1  kHz/
diu BF 
Eonlrol:  lfiSllTOR
Preset:  -- B/tl: 
lS
Freq:  sranning ffiz
f,ftenualion:  fi 
dS
lhn  RF In:  Rf 
I/t}
lhdulatisn  Tupei 
Fll
fiudio  Surl  0.8$ff U 
Pk
Fixed  lkHzi S.988 U 
r
$cnth:  8.094 il 
x
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tode:  i23
Dilf,:  E.[0[ 
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x
tsde  : 
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x
ftF
DISPT*V lllst 
I
stfilt AT
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Figure  3-11. Preset Scan  Mode
29 
						

							acquired, 
the Freq: 
field in 
the  RF 
Control
zone  indicates  metering 
and its 
counterpart  in
the  meter  zone  displays  the 
channel  on which
the  carrier  was 
detected.  Also 
displayed  in 
the
meter  zofle 
ars the  preset 
number  of the channel,
the  received  power 
level and the modulation
level  of the  received  signal.
To  activate  the Preset  Scan 
function, depress the
Preset  Scan  softkey. This  key 
not  only begins
the  preset 
scanning  but 
also  serves  as 
a contin-
ue  key  to temporarily  skip past 
a channel  with
heavy  radio traffic.  When the 
analyzer  is 
locked
on  a preset 
frequency  and you 
wish  to 
continue
scanning,  although 
the 
signal  is 
still  present,
press  the Preset  Scan  softkey again. 
This  contin-
ues  the 
scanning  with 
the next  preset 
frequency
in  the  memory  table. Pressing 
the Preset 
Scan
softkey  only 
skips  over 
a frequency  once; if
radio  traffic  is 
still  present 
on that  frequency  the
next  time  that it 
is  scanned,  the analyzer  will
stop  and dwell  once again.
The  number 
of preset 
frequencies  to 
be  scanned
can  be limited 
by using  the 
Low 
Preset  and
High  Preset  fields in the  meter 
zone. Entries  in
these  fields  will cause  the 
analyzer  to only  scan
from  the low  preset 
number  to 
the  high  preset
number.  By 
carefully  ananging  the preset 
fre-
quencies  in the  RF  memory  into 
related  groups,
you  can make 
maximum  use of 
the  Low  Preset
and  High  Preset  scan  limiters. 
For 
example,  a
particularly  busy preset frequency 
which is
catrsing  the 
analyzer  to 
stop  scanning  and 
dwell
for  long  periods 
of time  can 
be removed  from
the  scan  list 
by moving  it 
within  the RF  memory
table  to a location  just 
above  or 
below  the preset
numbers  being scanned.
It  is  recommended  that frequencies 
in 
the  RF
memory  table be grouped 
according  to their
modulation  type 
and bandwidth  because 
these
parameters  must be manually  changed in 
the
analyzers  RF 
Control  zone. If 
an  AM  frequency
(e.g.  aircraft  band) is 
intermixed  with FM 
fre- quencies 
(e.9. 
public 
service  band) in 
the  scan
list  and  the 
analyzer  is 
set  to FM 
mode,  radio ^-
traffic  on the  AM  frequency 
will cause  the
scanner  to 
lock, 
but the received  audio  will 
be
unintelligible  and 
the modulation 
measurement
will  be meaningless.
Because  breaking  the receiver 
squelch causes 
the
analyzer  to 
stop  scanning,  it 
is  important  to
properly  adjust the 
squelch  control. 
If the
squelch  is 
adjusted  too loosely  (counterclock-
wise  rotation 
of the  squelch  knob), 
undesired
noise  signals  will 
break  the receiver  squelch  and
the  scanning  function 
will not 
operate  properly.
If  the  squelch  is 
adjusted  too 
tightly  (clockwise
rotation  of 
the squelch  control knob), 
it is  possi-
ble  that 
desired  signals will not 
be strong
enough  to 
break  the 
squelch  and the 
analyzer
will  not 
stop  and 
dwell  on the 
channel.  To
adjust  the 
squelch  control 
for proper 
scanning
operation,  turn 
the  squelch  control fully 
counter-
clockwise  and  activate 
the Preset Scan  mode.
The  analyzer  will 
not 
scan  because  it will 
lock
on  the  first  frequency 
due to 
the  squelch  being
open.  Now 
slowly  rotate 
the 
squelch  control t
clockwise,  just 
until  the squelch  light goes 
out,
the  noise  in 
the  speaker  stops and 
the unit
begins  to 
scan.  If 
an  actual  signal is 
received
while  the  squelch  is 
being  adjusted,  wait 
until  it
ends  before  resuming 
the  adjustment.  For 
maxi-
mum  sensitivity,  the 
squelch  level 
should  be
adjusted  as loose 
as possible 
(cbunterclockwise)
without  being broken  by receiver  noise.
To  halt  the scanning  operation  at 
any  time,  press
the  RF  Display 
softkey. This 
stops  the 
scanning
and  leaves  the 
analyzer  locked 
on the  last
scanned  frequency  prior 
to the  key  press.
Note:  When the 
unit  is 
in  the  Preset  Scan mode,
the  response  time 
to key  presses 
will be
somewhat  slower than normal.  For 
best
results,  it is  recommended  that you 
do not
leave  Preset 
Scan active  in the  Display
zone  when 
it 
is not  being used.
30 
						

							Input 
Lvl
Displays  the 
signal  level 
received 
at the  select-
ed  front  panel 
connector.  This 
area displays
transmitter  power 
for high  levels 
of input  as
well  as lower  levels 
of field 
strength.  Data 
is
displayed  only for on 
channel  carrier fre-
quencies.  A 
single  cursor 
field 
at this  location
allows  selection 
by softkey  of either  micro-
volts/watts  or 
dBm  units  of 
display.
When  the GENERATE  mode 
is 
selected,  the RF
Display  area  shows  generator 
center frequency
as  well  as generate 
level per 
the RF 
Control
zone  entry.  A 
single  cursor 
field 
at this  location
allows  selection  by 
softkey  of 
either  millivolts/
microvolts  (mViuV), 
dBu, or 
dBm  units 
of
display.
When  DUPLEX 
mode is 
selected,  the RF  Dis-
play  area reflects 
a 
combination  of the  monitor
and  generator 
data, as 
described  above. 3-7.1.2 
Preset 
Scan
The  R-2550  analyzer  provides 
a preset 
scan
function  in  which  the preset 
monitor  frequencies
stored  in 
the  RF  memory  are 
continually
scanned  (figure 
3-11). The 
analyzer  scans
through  the preset 
frequencies,  stopping 
and
dwelling  on a channel  whenever  the receiver
squelch  is 
broken.  When the receiver 
becomes
squelched  again, scanning  resumes. 
All20 preset
monitor  frequencies,  or 
a subset  consisting  of 
a
continuous  block offrequencies,  can 
be  scanned.
When  no 
signals  are  detected,  the analyzer 
scans
through  all20 preset 
frequencies  in 
less  than  ll2
second.  If 
the  number 
of preset 
frequencies  to 
be
scanned  is reduced, 
the  scanning  process 
is even
faster.  RF 
signals  to be 
scanned  can be input
from  either  the ANT 
or RF 
VO  ports.
While  the 
analyzer  is 
scanning,  the 
Freq:
fields  within  the meter  zone  and  RF 
Control
zone  indicate  scanning.  When 
a carrier  is
iletrn  : ?iliGl!5I[[FI 
]hde : 
SIfitO08D
Freq:  -stanning- 
JSlz llev: 
-----  kHr
Presel  ttui  InPut 
Lul:----.  - 
dBr
Lo  Fresel:  S0 
Hi 
P0eset:  19
Di  splac:  HnULfiTI{Ht 
S[{PE
Irigger:  f,UT0 
Irig 
Lul;5t8{rel  lul}
llsrizl  50 
us/diu  Posiiion:  (tt)
Uert  i 
ral  i
1  kHz/
div BF 
Eon*rol:  ifiIlITlS
Preset:  -- 
B/ll: tS
Fr*ql  scanning ffilz
fittenuation:  S 
dS
lkn  HF In:  Rf 
I/0
lhdulat  isn I
fiudio  Sur:  8.99S lI 
Pk
Fixed  lkHzi S.gtg U 
x
Scnfh:  $.8t4 
U 
x
Fofla*  sel 
l  IlPt
[ode:  923
DIIF:  [801 
u 
x
tode  : 
12345  f 
?S  gtt8*RICI]
Ext*rnrl:  0.00S 
U 
x
RF
DISPtS| ltLlil 
I
stAil fit
u0LTs If,
u{r-Ts IHT
DISI t1{T
DIST SIHAO
tofe
Figure  3-11. Preset Scan  Mode
29