Motorola R2550 Service Manual

							acquired, 
the Freq: 
field in 
the  RF 
Control
zone  indicates  metering 
and its 
counterpart  in
the  meter  zone 
displays  the 
channel  on which
the  canier  was 
detected.  Also 
displayed  in 
the
meter  zone 
are 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 
seryes  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
causing  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.g. 
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  bscause  it will lock
on  the  first  frequency 
due to the  squelch  being
open.  Now 
slowly  rotate 
the squelch  control
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 
						

							3-7.I.3 
AC/DC VOLTMETER
The  Analyzer  provides 
a general 
purpose
AC/DC  digital voltmeter  (figure 
3-12).  The
voltmeter  input 
is the  same  front panel 
BNC
port  that also 
serves  as 
the  input 
for the
SINAD/DIST  meter, 
the VERT 
oscilloscope
input,  and the period 
COUNTER  IN.
Move  the  cursor  to 
the  Range: 
field. Select
the  voltage  range (1V, 
10V, or 100V 
DC) by
pressing  the  applicable  softkey. 
Maximum  AC
range  is 
70  VAC.  If 
ttre  optional 
battery pack 
is
installed,  an 
additional  selection is 
available  to
read  the  battery voltage.
CAUTION
The  mnximum  analyzer 
input voltage  is
100  volts  peak.
The  data  portion 
of this 
screen  will 
show  a hori-
zontally  oriented  bar graph 
for an analog  indica-
tion  along  with a 
digital  readout 
of the  measured
voltage  (up 
to 4 
digits  resolution).
In  the  AC  mode,  the measured 
input is 
also
displayed  in 
dBm,  referenced 
to lmW 
into 600
ohms.
3-7.1.4  INT 
DIST/EXT  DIST 
Meter
The  internal 
and external  distortion  meter 
are
selectable  via 
softkeys  located 
within the rMe-
ter:  field  in 
the  Display 
zone. The 
display
consists  of a 
digital  readout 
and bar graph.
Distortion  is 
used  to measure 
the  audio  quality
of  the  transmitter  and receiver  modulation.  The
distortion  meter 
is 
selectable  via 
softkey  be-
tween  internal  (coupled 
from the monitor  de-
modulated  signal) and external  (through 
the
DIST  input  on the  front  panel). The  distortion 
meter 
operates  only 
at the  fixed
frequency  of I 
KHz.
3-7.1.5  SINAD Meter
The  SINAD  meter 
is 
selected  within 
the
Meter:  field in 
the  Display  zone. Display 
con-
sists  of a digital  readout 
and bar graph. 
SINAD
is  used  in 
making  receiver  sensitivity  measure-
ments  per 
EIA  specifications  using 
a fixed 
1
kHz  modulation  frequency.
Internal  coupling  for 
SINAD  is 
not  provided;
input  is  always via 
the extemal  BNC port 
on the
front  panel.
3-7.1.6  Counter  and Decoding  Functions
The  following  are 
all accessed  via 
softkey
through  the Meter: 
field within  the Display
zone.  Their inputs 
are all normally  internally
coupled  to 
the  monitor  demodulated  signal for
either  direct 
or off-the-air 
testing. If 
use  of
these  functions  is 
needed  for 
an externally
applied  signal, the 
Special  Functions 
screen,
under  SYSTEM  FUNCTIONS,  provides 
ameans
of  switching  the input 
of the  Counter/decoder
from  Internal 
to External.
These  screens  contain  a Sensitivity:  field
where  MIN 
or MAX 
may  be  selected  via 
soft-
key.  This provides 
a means 
to desensitize  the
counter/decoder  circuits, 
if needed 
to properly
measure  very high level  signals. 
Under normal
operation,  this field 
should  be 
set  to MAX.
The  display  exhibits 
a digital  frequency 
and
equivalent  PL 
code  if 
applicable.  Refer 
to
Appendix  B 
for  valid  codes.
31 
						

							rkl
Displagi  EHTERHAL SC{FE fouplins:  At
Trigger:  ftUT0  Trig 
Lul:5|*{rel  lul}
lloriz:28T  us/dit, 
Position:  {+}
iler-titrli rg[  l{t/
diu
fht*: 
EIEItr[ElElI
ftange:  I 
U llode: 
SIAIOf,BD
8.351  U$t ftF 
tontroli  ll0HIT0ft
Fresel:  -- g4{: 
lfi
Freql  86S. ?6?t  Ftlz
Atterruation:  g 
dS
lbn  fiF In:  fiilT
lfodulat  itn T
Audio  $ur!  $.585 U pk
Fixed  lkHri 9.588 
U
$cnthl  8.5S9 
U 
x
Fomat  $el 
! T{SE  FlfI
DTiS:  [. ffi0  u 
x
fode:  ------
External:  8.8S0 U 
x
RF
DISPTRY PFESET
steil AT
trtil-Ts tll
U&IS IHT
DIST THT
DIST SI}SD
fmle
lleter:lEil[itrGfilffi!
ffrngei  I 
U fiF 
ttntroli  lffIlIItH
Prsset:  -- 
B/tl: lS
Freq  i  868. ?62T  ltlz
Altenurtion:  I 
dB
lhn  fiF In:
lhdulation  T
Audio  $ur!  S.5Bl U pk
Fixed  lkllz: 8,5N0 
U
$cnth:  0.599 
u x
Fomat  Sel: I$€ RlfT
0rlf:  a,00tu x
fode  i ------
Extecnal:  0.08$ U 
x
s.351 
llfit
gkl  -6,SdSr
Displau:  EXTEnilfiL SttFE [oupling:  *t
Trisser:  fiUT0 Trig 
Lul:5$8trel  lttl)
290  us/diu  Position:  (+l
Uertiral: rg8  dr/
dirt
IF
DT$PLRT PFESET
stAll ffL
uftrs D[
util-r3 IHI
DIST EXT
DISI SII#D
mre
Figure  3-12, Digital 
Voltmeter  Screens
32 
						

							PLIPER 
Counter
This  softkey  provides 
a convenient  means 
of
measuring  the frequency 
of Motorola
Private-Line  (PL) 
or any  other  low frequency
audio  tones 
with 3 
digit  resolution. 
Period
measurement  makes 
it possible 
to measurs  low
frequencies  down to high  resolution  without
the  need  for the  long  gate 
times  associated
with  frequency 
counting.
CAUTION
Do  not 
input 
frequencies  above 
400
kHz  to 
the  period 
counter.  Slow 
down
of  system  operations  will 
result.
DPL  DECODE
This  softkey  provides 
decoding  for 
valid
Motorola  Digital Private-Line  (DPL) 
codes.
Refer  to Appendix  B 
for  applicable  codes.
Selection  of 
high 
and low  pass 
filters  may 
be
made  from this 
screen  as 
described  above. DTMF 
DECODE
This  softkey  provides 
a means 
of decoding
DTMF  (Dual 
Tone Multi 
Freq) signaling  for
testing  telephone 
interfaced  systems. A re-
set  softkey  clears the 
display.
3-7.2  Display
Any  of  the following  graphic 
data displays 
can
be  selected  for 
simultaneous  display along 
with
the  previously 
discussed meter 
displays.  Select
using  softkeys  from the  Display: 
field 
in the
Display  zone.
3-7.2.1  Spectrum 
Analyzer
The  Spectrum  Analyzer (figure 
3-13) is  active 
in
the  MONITOR  or DUPLEX  modes. Move the
cursor  to 
the  Display:  field 
within  the Display
zone.
Select  SPECTRUM  ANALYZER  by pressing
the  softkey.  The 
input  frequency  spectrum  is
displayed  in 
a frequency-versus-amplitude
Figure  3-13.  Spectrum AnalYzer
lleter;flF 
DI$FLA?  thde:SIAtOfi[D
llon  Freq:  ?[. 
EE08  lTfu  Seu: l. 
SE  klk
Frsq  Emi-  Sl 
H: 
InPut  Lul:-  6?.S 
d$r EF 
lcntrsl:  lffiIIffi
Presef  : 
-- 
$/l,1: iE
freq:  8?S.flSSO llk
*tienuation:  S 
dE
Disptrg:  ffiEsiEIHss
Sensitivitg:  lslt 
Disp*sian:  2E 
kllr/diu
-50 -?s
input  LUI
tdSr) -98
-110 lhn 
BF In:
HoJulation  I
f,udio  $ur: 8.98t |l 
Pk
Fixed  lkHzl T.r!8  l, 
x
$unth:  l. 
ASS  t| x
Fomef  Sel 
I  OPt
fode:  423
DT!S:  A. gBE 
U il
tode:123456?S918*AB[S
Exlernal:  E. 
l9E  U x
33 
						

							(dBm) 
graph. 
Either the ANT 
or RF 
VO  port
may  be 
selected  for 
input  from 
the RF 
Con-
trol:  zone.  The 
amount  of input 
attenuation
may  also be selected  within 
the zone 
to 
vary
the  sensitivity  of 
the  Spectrum  Analyzer.
NOTE
If  SPECTRIIM  ANALYZER 
is 
selectedwhile
the  Preset 
Scan 
feature  is 
active,  the 
spec-
trum  analyzer  wiII 
be temporarily  disabled
during  scanning,  but 
will 
become  active
again  when 
the analyzer  loclcs 
onto a 
signal.
Sensitivity The  SA Sensitivity: 
MIN/lrdAX field 
shifts
the  baseline  reference 
of the  display  by 10 
db.
This  is valid only  for 
0 dB  input 
attenuation.
Changing  the 
input  attenuation  or 
changing
from  ANT 
to RF  VO  port 
in the  RF  Control
zone  will change  the 
vertical  scale of the
Spectrum  Analyzer 
display. Calibration  is
maintained  between the display 
and the signal level 
present 
at the  input  port 
so there  is 
no
need  to compensate  for 
added attenuation.
Dispersion  (freq/div)
Select  the  bandwidth  (20 
kHz,  50 kHz, 
100
kHz,  200 kHz, 
500 kHz, 
1 
MHz)  bY 
first
moving  the cursor  to 
the  dispersion  field, 
then
pressing  the desired  softkey.  Center frequency
is  entered  from 
the RF Control  zone 
and may
be  conveniently  varied 
with the TUNING
knob.
3-7.2.2  Modulation 
ScoPe
The  Modulation  Scope (figure 
3-14) displays  the
internal  modulation  waveforms.  It 
automatically
switches  between generator 
or monitor  modula-
tion  depending  on 
which  mode 
is 
selected.
In  DUPLEX  mode, 
select either  generate 
or
monitor  modulation  displays by 
first  moving  the
cursor  to the  Select: 
field within  the Display
area,  then pressing 
the desired  softkey.
OISPLfiT
GBn  Freqi  225.88Tt  ffilz Lul:?9?.1S  u$
Si  spl  ag 
: Ififtflfinftfif,flifl
Irigger:  f,lll0 
lris Lut:50$tcel  lul)
Honizl  29T 
usldiu  Fosition:  (+)
Uertical  !
5  kHr/
div EF 
tontrol:  GtIfiSATE
Preseti  -- 
Blll: t*
Fneq:  225.09T8 ltlz
tbtput  Lvl : 
-l5l  t 
dBr
Gen  fiF {ki:  BF 
I/0
ttudulatisn  I
llod  Sur!  ?.01 kllz
Fixpd  lkllz! l.0l kllz -
Scnth:  0.80 
kHz x
Fomat  Sel:  DPL
tode:  t23
DTlf  :  0.ll 
kllz x
t  ode  : 
I  23456?$9*lI0BtD
External:  0.Et 
kllz x
sPttTftlt
IrftLvzR ltft
SCME ENI
sttFt sfiR
trOPHS INATK
CE}I
Figure  3-14. Modulation 
ScoPe
34 
						

							NOTE
Because  the 
R-2550  Analyzer 
has 
a 
fiilly
digital  oscilloscope  (storage 
scope), 
-it inher-
titty  lrot 
some  characteristics  which 
are
dffirent  from the 
real-time  analog 
scopes
\i*ttto,  to 
most  users.  For 
best  overall
-results, 
it is  recommended  that 
the trigger
Ievel  be 
set  to 
500  and 
the triggering  be 
set
to  AUTO.
The  Display  area 
of 
the  screen  will indicate
rr,roouiniroN  scoPE 
with 
the input  signal
displayed  in 
a time-versus-frequency  graph 
To
change  triggering,  horizontal position 
horiz-
ontal  range, 
vertical  position, 
or 
vertical  range
use  the cursor  control  keys 
to 
highlight  the
appropriate  cursor 
fields 
as 
follows:
Trigger Press  the AUTO,  NORMAL,  or 
SINGLE
SWEEP  softkey to 
select  the 
type  of triggering
desired.  The 
trigger  level 
synchronizes  the
horizontal  time 
base to 
the  vertical  input
signal.
In  AUTO  mode, 
the 
scope  will 
trigger  contin-
uously.  In 
this  mode,  the 
analyzer  will 
always
re-sweep  the 
display  even 
if 
there  is 
no  signal
present.  The 
rate will be about  1 
per 
second
with  no 
signal  present 
and about  10 per 
sec-
ond  with 
signal 
Present.
In  NORMAL  mode, 
the 
scope  will trigger
when  the vertical  signal 
exceeds  the 
trigger
leve1set.  In 
NORMAL  mode 
the analyzer  will
re-sweep  at 
a rate 
of 10  per 
second,  with 
the
last  screen  display  remaining  after 
removal  of
the  signal.
In  SINGLE  SWEEP mode, 
the 
scoPe  will
trigger  one time  for 
each  softkey  press 
subject to 
the  trigger  level 
setting  (triggering 
always
occurs  on 
the  rising  portion 
of the 
applied
waveform).  Messages 
on 
the  line  just 
above
the  softkeys  indicate 
the 
status  of 
the  single
sweep.  The 
single  sweep  is 
useful  in 
measur-
ing  one-time  events, 
such 
as 
a 
tone  burst  at
the  beginning  of 
a 
transmission  Such 
bursts
may  be followed  by 
other  modulation  which
would  over-write  the 
screen  if 
measured  in 
the
NORMAL  trigger mode.
Level Adjust  the 
TUNING  knob 
to 
select  the 
desired
trigger  level. 
The 
trigger  level is 
a relative
level  setting  between  the 
values  of 
0 and 
999
(full  scale)  where 
0 
is  the  most  negative  and
999  is 
the  most 
Positive  voltage
NOTE
To  achieve  the 
fastest  update 
rate 
of
the  display  a 
trigger  level 
setting  of
500  is recommended 
for most 
applica
tions.
Horiz Press  the 
desired  softkey  to 
select  the Horizon-
tal  Sweep  rate (20 
us to 1 
segond/div)  Since
all  ranges  cannot  be 
shown  on 
one  screen
press  the more 
softkey  for 
additional  select-
ions.
NOTE
If  horizontal  sweep 
rates 
of 
Sreater
than  l0 
msec/div  are 
selected  the
update  rate 
will slow  down  A 
good
overall  setting 
for most 
applications  is
200  usec 
Per division
35 
						

							Horizontal 
Position
Adjust  the horizontal  position 
through the
(<  >)  cursor  field 
either  by using  the 
desired
softkey  (MovE 
LEFT, MOVE  RIGHT) 
or by
using  the rotary 
TUNING  knob.
Vertical  Sensitivity
Press  ttre  desired softkey  to 
select the  Vertical
Sensitivity  (AM: 
|Vo, lo 50Vo  p$ 
division,
FM:  100 Hzto 
50 kHz  per 
division,  dependent
on  bandwidth  selected).  When 
all ranges
cannot  be shown  on 
one  screen,  press 
the
more  softkey  for 
additional  selections.
NOTE
The  vertical  scales  and 
softkeys 
for FM
deviation  will 
change  autom.atically
between  wideband and 
narrowband.
Vertical  Position
Adjust  the vertical  position 
through the ( 
0  )
cursor  field 
either  by 
using  the 
desired  softkey
(MOVE  UP, MOVE  DOWN) 
or by  using 
the
rotary  TUNING  knob.
NOTE
Scale  and positioning 
adjustments  are
not  possible 
for stored  waveforms 
that
are  displayed  through the 
use  of single
sweep  or triggering  on 
single
non-periodic  signals.
3-7.2.3  EXT,L 
SCOPE
The  Analyzer  provides 
a general  purpose 
oscillo-
scope  with 
calibrated  vertical input 
sensitivities
and  automatic  or 
triggered  horizontal 
sweep rates. 
Use the scope  to analyze  waveforms,
detect  asymmetric  modulation 
or audio  distor-
tion,  trace 
signals, and  troubleshoot.
The  vertical  (VERT) 
input is 
the  same  BNC  port
that  also 
serves  as 
the  input  for DVM,
SINAD/DIST  meter, 
and COUNTER  IN.
The  EXTL 
SCOPE  mode 
has an additional
cursor  field 
to select  Coupling: 
AC or DC 
via
softkey  selection.  Operation of triggering,
ranges, trace  positioning 
and optional  markers
are  the  same 
as described 
in MODULATION
SCOPE  above. 
Vertical  ranges 
will always
display  in 
voltage  per 
division  in 
the  EXTL
SCOPE  mode.
3-7.2.4  Tracking 
Generator  (Option)
This  display  must 
work in  conjunction  with the
TRACK  GENERATE  mode 
which  is 
selected
thru the  RF 
Control:  field 
of the 
RF  zone.
Refer to  paragraph3-5.4 
for a full 
description  of
Tracking  Generator  operation.
3-7.2.5  Bar 
Graphs
The  bar  graphs 
provide 
a graphical 
display of
the  RF Display 
data from  the Meter  area of the
screen.
NOTE
The  Freq.  Error 
bar graph 
is not 
available
if  PRESET  SCAN, PWER 
COUNTER,  or
DPL  DECODE  are selected  in the  Meter:
field  area.
36 
						

							3.8 
OTHER  FUNCTIONS
3-8.1  Audio  Monitor
The  Analyzer  has 
a 
speaker  for 
the  purpose 
of
audibly  monitoring 
the 
recovered  baseband
signal  in 
the  MONITOR  and 
DUPLEX  modes
and  the modulating  signal in 
the 
GENERATE
mode.  Switching  between 
the 
two  is 
automatic.
Using  the 
VOLUME  control, the 
input  signal  to
the  speaker  is 
adjustable  to 
a maximum  level 
of
0.5  watts  rms.
The  speaker  is 
also  used  for 
audible  warnings,
such  as RF 
overtemperature.
3-8.2  Remote 
OPeration
To  use  the remote  function,  refer 
to The 
Pro-
grammer  Reference  Manual, 
68-80309855
3-8.3  Calibration
Calibration  of 
the  Analyzer  is performed 
by the
following  steps.
a.  Press 
the CAL  key 
to instruct  the processor
to  perform 
a self  calibration  on 
the  system
The  CAL  function  provides 
a self calibra-
tion  of the  units  RF generator 
output level,
the  monitor  input 
level 
and the modulation
level.  All 
other  parameters  are 
not 
subject
to  this  self-calibration.
This  assures  the 
units  specification  ac-
curacy  under 
conditions  of 
ambient  temper-
ature  extremes  and 
aging.  Re-calibration  is
recommended  at 
weekly  intervals  or 
when
the  re-calibrate  warning 
appears on the
screen.  Calibration  is 
only  recommended
after  the unit  has 
fully  warmed 
up to oper- ating 
tgmperature  unless critical  measure-
ments  are needed  immediately  upon turn-
on. CAUTION
Before  starting  self 
calibration  be 
sure
that  the 50 ohm  load,  attached  bY
chain  to 
the 
front  panel, 
is connected
to  the  GEN 
OUT 
Port.  This 
Provides
the  termination  which 
is essential  to
proper  calibration.  AIso 
ensure  all
connections  to 
the  RF 
I/O  and  ANT
conne  ctors 
are removed.
Press  the 
START  softkey 
to 
begin  the 
cali-
bration.  While the 
calibration  is 
active,  the
message  calibrating 
appears.
When  the calibration  has 
been  performed,
the  message  complete 
appears- Press 
the
return  softkey  or 
a cursor  control  key 
to
return  to 
the  previous 
screen.
3-8.4  Special  Functions  Menu
The  Special  Function  mode (figure 
3-15) ac-
cessed  by pressing  the 
SPF key,  provides 
control
over  various  system conditions  as 
follows:
VERSION Accesses  a 
display  table 
which  provides 
the
internal  software  version and 
checksum  for 
the
system  and 
any options 
Present.
RS-232  SETUP
Accesses  a 
display  table which 
allows  configu-
ration  of the 
RS-232.
SPF  RESET
This  softkey  appears  throughout  the 
Special
Function  screen as 
a  convenience  in 
resetting
b.
c.
37 
						

							SPET!f,1  TIIHTTIfiil.S 
!Et$
iffim
REI{IIT  STTUP
SYSTEH  FUiltTIot{S
EmBLt  Generale  lfude Sperker
Elff8LE  euto Snitch  to 
lf;ltl  if )ff.It|
IilItHf{fiL  Ilflll tlecoding
reset
SPFs il  i 
splag
table relurn
Figure  3-15.  Special Functions  Menu
of all  special  functions  to 
the  factory  standard  .I{VM 
Clear
state.  This 
will 
switch  all 
decoding  to 
internal.  This 
softkey  erases the entire  RF Preset  -
memory  area and  front panel 
CAL memory.
SYSTEM  FUNCTIONS  The Analyzer 
must be recalibrated  after  this
Accesses  softkeys to 
select 
the following:  key 
has 
been  pressed.
NOTE
When  any of 
the 
following  special
functions  are 
selected,  the 
normal
operating  screens wiII 
flash  a warning
SPF  Enabled  at the lower  right 
of the
special  functions  inadvertently 
lefr
enabled  can adversely 
ffict norm.al
operation  of the 
unit.
screen. This 
serves as a reminder 
since  .Save 
State
.NVM 
Reset
This  softkey  provides 
a less 
extensive
system  reset than 
NVM Clear.  CAL and
preset  memory  are not 
erased.
Sets  the  current  condition  and 
settings  of
the  unit  as the  power 
up state.
ENABLE/DISABLE  Generate Mode 
Speaker
Provides  the means 
to disable  the  internal
speaker  during generate 
mode.
38 
						

							ENABLE/DISABLE 
Auto 
Switch  to 
MON  if
0.1  W
Allows  the 
unit  to 
automatically  switch 
to
the  MOMTOR  mode 
when 
Power  levels
greater  than 0.1 watt  are applied  to 
the  RF
IN/OUT  front 
Panel  connector
INTERNAL/EXTERNAL  INPUT 
Decoding
Switches  the 
decoder  function 
between the
internal  monitor 
demodulated  signal 
and 
the
signal  at 
the  VERT/SINAD  front 
panel 
con-
nector.
3-8.4.1  Special Function 
Selection
To  select  a 
special  function 
follow 
the following
procedure.
1.  Press  the 
SPF  key 
to 
display  the 
special
functions  menu 
on the  disPlaY 2. 
Move  the cursor  to 
highlight  the 
field  of the
function  desired.  Applicable  softkeys will
be  presented.
3.  Use  the 
softkeys  to 
make  selections  Levels
may  be set  using  the 
TUNING  knob 
or key-
pad.
4.  Press  the return  key 
to return  to 
the  previ-
ous  screen.
3-8.5  MemorY
The  Memory  screen provides 
for viewing  and
entry  of preset 
frequencies  into 
non-volatile
memory.  The 
actual  selection  of 
a preset 
num-
ber  for 
operation  of 
the  system  can 
only  be 
done
from  the RF 
Control  zone.
Pressing  the 
MEM  key 
accesses  the 
memory
display  (figure 
3-16) which 
shows  the20 presets
Figure  3-16. MemorY  Screen
iEl{lf,f
lbn Freq
(lllz)
ft81  ri8. 
sE88
sll  225.5108
821  125.S088
t3I  44$,5BlB
841  999.9999
05i  999.9999
s6r  999.9999
B7I  999.9999
8S1  999.9999
flgi  999.9999 lurrenl 
Freset 
l0]
6en  Freq
(llHz) lbn 
freq
tl$lz)
10r  999,99C9
1lI  999.9919
121  999.9999
131  991,9999
141  999, 
t999
tst  999.9999
161  999.9999
1?1  999.9999
tsl  999.9999
191  999.9999 Gen 
Freq
{Flz}
115,8[8S
t25.5886 4e5.9908
424.5103999.9999999.9999
999.  9999
999,9999 999.9999
999.9999 999.9999
999.9999
999,9999
999,9999T99.9999999.9999
999.9999999,9999
999,9999 999.9999
llse  numric  kegs
in eddition  to 
soflkegs
39