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în  the  actual  transmission  o£  either  USB  or  LSB,  the  carrier  is  removed.  AU  of  the  modulation  for 

a  transmission  is  concentrated  in  either  the  Upper  of  Lower  sideband.  In  the  receiver,  the  carrier 

is  reconstrueted  and  the  intelligence  or  modulated  voice  is  then  detected,  amplified  and  converted 
into  an  audible  sound  heard  at the  speaker.

AM  (Amplitude  Modulation)  has  been  the  standard  method  of  Citizens  Band  B  réception  and 

transmission  for  many  years’and  most  of  the  existing  transecivers  being  used  today  are  AM.  Techni- 

cally,  Amplitude  Modulation  is  Double  Sideband  (DSB).  In  this  method  of  operation,  a  carrier  is 

transmitted  which  is  modulated  or  mterrupted  by  voice  on  both  positive  and  negative  sides  as  re- 
presented  by  figure  2.

Figure  2

C O M P A T tB ILlT Y

The  13-898B  is  designed  to  be  completely  compatible  with  all  current  modes  of  Class D  operation, 
including  single  sideband,  (upper  or  lower),  double  sideband,  or  conventional  AM  and  is  equipped 
with  separate  transmit ter  circuitry  to  provide  high  level  AM  (Amplitude  Modulated)  transmissions 
and  Ttue  SSB  (Single  Sideband)  transmissions.  The  receiver  section  is  also  capable  of  receiving  AM 
and  SSB.  The  mode  of  operation  for  both  receiver  and  transmitter sections is automatically selected 

by  the  mode  seleetor  switch.

-   3 -

Содержание 13-898B

Страница 1: ......

Страница 2: ...s manua are supplied for the use of a qualified holder of a first or second class radiot l phone license in servicing this transceiver It is the user s responsibility to see that this unit is operatin...

Страница 3: ...t has been highly effective in commercial amateur and military usage for many years It is a superior means of wire iess com munications allowing transmissions of greater distances with a minimum amoun...

Страница 4: ...ude Modulation is Double Sideband DSB In this method of operation a carrier is transmitted which is modulated or mterrupted by voice on both positive and negative sides as re presented by figure 2 Fig...

Страница 5: ...0R MICROPHONE CQ NNECTOR PU SH TO TALK M ICRO PHONES PHONE JACK SIG N AL M ETER FINE TUNE CONTROL C A U 5 WR SWITCH POWER ON O FF SWITCH j RE GAIN CONTROL R F C A U B R A T E KNOB MODE SWITCH TRAN SM...

Страница 6: ...ANTENNA CONNECTOR______ TV I TRAP PA JACK AC POWER CONNECTOR _ _ FUSE A DC POWER CONNECTOR RECORD OUTPUT JACK EXTERNAL A U X I U A R Y IN P U T J A C K 8...

Страница 7: ...speaker when receiving The volume control does not affect transmitting output RF G AIN Controls RF gain when receiving To increase RF gain r ception sensitivity tum the knob to the clockwise direction...

Страница 8: ...f conventional AM operation or SSB operation on either upper or lower side band In order to com municate with another transceiver you must use the same operating mode FINE TUNE When receiving SSB sign...

Страница 9: ...RATE knob so that the SWR meter pointer reads maximum or SET Release the push to talk switch 5 Depress the CAL SWR push switch and agam press the push to talk button The SWR of your antenna system wil...

Страница 10: ...ch must be placed in released out CB position PHONE JACK When a headphone is inserted it autornatically disconnects the internal speaker REC JACK Both transmitting and receiving signais are supplied t...

Страница 11: ...usted for maximum transmitter power output while transmitting with mode switch placed in AM position observing EF power meter AN TEN N A CONNECTOR Used for antenna connection matches PL 259 standard t...

Страница 12: ...rolled by the POWER push switch only regardless of the OFF ON AUTO ALARM switch To turn on the transceiver automatically at the desired time tune in a desired ehannel in advance and adjust the volume...

Страница 13: ...ive greater distance even under adverse conditions The range or the transceiver also d pends on the height of the antenna so whenever possible select the highest location within F C C limits Whatever...

Страница 14: ...h switch in either position 9 Place the channel selector switch o a desired channel 10 Place the mode selector switch in a desired mode position 11 Adjust the VOLUME control for proper sound level 12...

Страница 15: ...e r gulations If you install your own transceiver do not attempt to make any transmitter tuning adjustments Ail transmitter adjustments and servicing are prohibited by the F C C unless you hold a firs...

Страница 16: ...AM Lower Sideband Upper Sideband RF gain control Calibrate Volume Squelch mode switch Fine Time Channel selector CAL SWR switch ANL BLANKER switch CB switch Time Alarm set switch Clock Function switch...

Страница 17: ...deband Suppression Harmonie Suppression AM TRANSMITTER Modulation RF Output Power Harmonie Suppression More than 0 5jiV S l dB More than 50 dB More than 800Hz More than 3 W O juV 100m V AM 0 25m V IOO...

Страница 18: ...17...

Страница 19: ...BACK VIEW 18...

Страница 20: ...FRONT VIEW 19...

Страница 21: ...BACK VIEW 20...

Страница 22: ...FRONT VIEW R401 R402 B A C K V IE W FRONT VIEW B A C K V IE W...

Страница 23: ...i S SCHEMATIC DIAGRAM OF 13 898B Printed in...

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