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...

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,...

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...

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...

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....

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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...

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...

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...

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...