Motorola R2550 Service Manual
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Page 61
6. 3. Turn on the receiver (unsquelched). In- crease the receiver volume control to feed audio noise to the R-2550 Analyzer (at least 1/4 the rated audio power). Record the noise reading in dBm. Within the RF Control zone, adjust the RF output level until the noise reading is less than 20 dB from the value recorded in step 3. Refer to your radios service manual to determine if any adjustments are required. NOTE: To convert the RF output level to uV or...
Page 62
2. Disable the PL/DPL squelch if so equipped. Set the radios squelch control to the point where the receiver barely quiets. 3. With the cursor located within the RF Control zone, press the GEN softkey NOTE: To convert the RF output level to uV or dBV, locate the cursor within the Display Contol zone and press the BF DISPLAY softkeY. 6. Repeat step 5 with the radios squelch level set to maximum tightness to deter- mine the tight squelch sensitivity of...
Page 63
th
the cursor located
within the Audio
ntrol zone,
turn on the modulation
and
the R-2550 synthesizer to provide
a
ninal 750 Hz (500
- I kHz)
deviation
o the radios
manufacturers
specifica-
ts.
i.!3;..1iii;:.;;;;; {!.i!tttrii.i
Fixed lkHz:
5 kHz
_
Synth: O.75 kHz
-
!:i::t;ir,rl i-l.i:
lili..
i::+i1+ {fil
i.;ifi;-:t (i.:.Jii
kn;:l li
iliir:i$l .{{:;l:iii:.Vili}iirjri.j{j:i.i
ble the radios
PL/DPL squelch cir-
Fully open the
carrier squelch
con-
hin the RF
Contol zone,...
Page 64
A AC AM ATTENAUTOBATTBNC BWC CAL CCIR C&E Ampere Alternating Current Amplitude Modulation Attenuation AutomaticBatteryCoaxial RF Connector Bandwidth CelsiusCalibrate International Radio Consultative Committee Communications and Electronics (Part of Motorola) CentimetersComplementary Metal Oxide Semiconductor Counter Cathode RaY Tube Continuous Wave Decibel Decibel (refened to carrier) Decibel (referred to 1 mW into 50 ohms) Direct Curent Demodulation DeviationDispersion Distortion...
Page 65
OF ABBREVIATIONS-CONTINUED rble rdwidth ) memory )rd gistered us lency Square recification SEQ SINAD SPF STD SWSWP Synth TN Trig TX UHFV VAC VDC Vert VRMS w WBXCVR XX Sequence Ratio of (Signal + Noise + Distortion)/(Noise + Distortion): Special Function Standard Switch Sweep Synthesizer Tone Trigger Transmitter Ultra High Frequency Volts Volts Alternating Cunent Volts Direct Current Vertical Volts (root-mean-square) Watts Wide Bandwidth Transceiver (Select Any Valid Number) 54
Page 66
APPendix B TONE AND CODE SPECIFICATIONS Table B-1. Standard DTMF Tones ;ffiisionsforencoding.anddecoding16differentkevs.Eachkeyis assisnedtworrequen:i:;.::^rj:r*::xtfiilrlnili.i;Jf;[ft lgiliffi SlTo asslgneo lw(J tlvgueil: -- with 16 ditterent coml rirll pft *:1qr:a[g:f,3fii,Yi,ih:;ili s i oi eac tr kev STANDARD DTMF (Hz) 697 770 852941 1209 1336 14771633 LOW Low LOW LOW HIGHHIGH HIGHHIGH Table B-2. DTMF FrequencY Coding* HIGH GROUP TONE LOW GROUP TONE 1 2 3 A 456 B 7I 9 c...
Page 67
Table B-3. Privare-Line (pL) Codes FREAUENCY (Hz) xz wz XA WA XB WB YZ YA YB zz ZA ZB 1Z 1A 1B 22 2A 28 32 3A 3B 42 4A 48 52 5A 5B 62 64 6B 7Z 7A M1 82 M2 M3 M4 92 M5 M6 M7 67.0 69.3 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.0 100.0 103.5 107.2 1 10.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 56
Page 68
Table B-4. DPL Standard Codes 023 o25 026031032043 o47 051054 065 071072073114 115116 125131 132134 143 152155 156 162165 172 174 205 223226 243 244245251 261263 265271 306 311315331 343351 364 365 371 411 412 413 423 431 432 445 464 465 466503 506 516 532546 565606 612624 627 631 632654 662 664 703712723 731 732734743 5,7
Page 69
Fc
sF I-3uF
p
K-
APPendix C
OF CMOS NTEGRATBD CIRCUIT
DEVICES
rit devices used
rnt afe of
the
lltlJ,ilJ *
MOS lCs
are
r static charges
rdling, shiPPrng
re assernblies rn
levices are
Pro.v-ld-
3:iffi:i1: such as
are en-
ns system
,iffi;HJft
,Oota* even in
a
sYD-
i:,iill;,lff li,ill
while servicing a
cir-
: l.,^lrtttv after
rnov-
;;litGt uu *o*tn-
li*n-ttonos to
a
bare
l:::i;ilsurrace rhis
ll;g*t*t* NOTE
Y#,##ffi#fr WARI{IFIG
when y**1fffi!ri,,
Y::;:{:f...
Page 70
5. jlt lte.ctrically powered test equip_ ment should be &ffiffi:,l:,1Tri:rti,i.i connecdng rhe le:t prru.. lirii.rrr, disconnect the test probe prior to removing the ground lead. If a circuit module is removed from rhe sysrem, ir is desirable ;or;;;;,,, or a conductive surfa., ir;;;;; sheer of aluminum foifl ,f,ii l, . ::l*:rrd to ground ,r,roeijdOr or resistance- WARNING :! the aluminum foil is con_ :::,:o directty to sround, be caufious of possible electri-_...