Standard Radio SR-C146 Operating Instructions Manual Download | Manualshive

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Summary of Contents for SR-C146

Page 1: ...ATING INSTRUCTIONS FOR SR C146 5 CHANNEL 1 WATT VHP FM PERSONAL 2 WAY RADIO FOR AMATEUR i STANDARD RADIO CORR 3622 Kamitsuruma Sagamihara shi Kanagawa Phone 0427 43 I I I I Cable TLX 2872 210 DRADNATS TOKYO ...

Page 2: ...rr ...

Page 3: ...y stability Modulation Crystal multiplication Spurious harmonics FM noise Audio response 1 0 watt or more 0 003 10 C 45 a 5 KHz narrow band 15 KHz wide band 12 times More than 50 dB below carrier At least 45 dB 1 dB 3dB of6 dB octave pre emphasis between 300 3000 Hz RECEIVER Sensitivity Squelch sensitivity Selectivity Audio Output Frequency stability Circuitry 0 4 uV or less 20 dB noise quiet meth...

Page 4: ...ery drain I The power for the radio is supplied by AA size eight pieces carbone zinc batteries eight pieces mercury cells or ten rechargeable Ni cad batteries All the operating controls are concentrated to the top of the radio The collapsible antenna can be push keditdownintotheradioforeasycarryingandfor Short ränge commimication On the Operation of the radio with a flexible antenna SR CAT12 or he...

Page 5: ... ready to receive a message from other radios by this system 5 The meter indicator indicates the strength of the incoming signal To send a message 1 Turn the radio on as described in To receive a message 2 Hold the radio so that the antenna becomes vertical and press the push to talk button to put the transmitter on the air Release the push to talk button as soon as you stop talking then you can r...

Page 6: ...ted on the top of the radio indicates a battery voltage The red marked zone on the meter indicator means voltase over 10 5 V which is the usable effective battery If you find the meter indicating less than 10 5 V replace all the batteries er Charge them 4 ...

Page 7: ...miter removes any vestige of amplitude modulation from the signal while the FM detector functions to recover the modulation producing an audio Output in response to a corresponding frequency or phase shift in the 455 KHz IF signal The FM detector Output is then amplified by an IC and two transistors and applied to the Speaker A noise actuated squelch circuit is included to silence the receiver Out...

Page 8: ...under normal Output levels from the microphone the transmitter FM carrier Output is pre emphasized 6 dB octave The component values employed in the speech amplifier are such that a 6 dB octave pre emphasis is applied to the input audio The peak limiter will have no effect on the audio signal imtil the microphone Output increases to a point where overdeviation would occur Therefore the non limited ...

Page 9: ...ow the input signal frequency in all cases The fundamental crystal frequencies are in the 16 MHz ränge and are multiplied nine times to reach the injection frequency The proper crystal frequency for a desired receiver signal frequency may be determined from the following equation fc fi ll 7 9 where fc fundamental crystal frequency in MHz fi desired receiver signal frequency in MHz The Channel Sele...

Page 10: ...tector Dl and D2 A sample of the collector Output from Q9 across R34 is also applied to the noise actuated squelch circuit FM Detector Circuit The secondary widing of L9 is connected in series with the center tap on the secondary of LIO while diodes Dl and D2 are connected to detect a positive or negative voltage in the secondary winding of LIO As the secondary winding of LIO and the two diodes re...

Page 11: ...decreases due to the quieting action of the limiter in turn reducing the Output from the squelch detector and cutting Q18 off Audio Circuit The audio signal from the FM detector is applied across the VOL control R40 to the IC This IC works as audio amplifiers and phase convertor for the next class B push pull amplifier stage QIO Qll function in a complimentary symmetry circuit since QlO is NPN tra...

Page 12: ...mitter modulated spectrum to the required bandwidth and reshapes the audio waveform The filter Output is then applied to the base of the integrator Q409 Integrator The integrator Q409 provides a 6 dB octave de emphasis to the audio signal Where the input speech level was of normal amplitude this de emphasis will offset the 6 dB octave pre emphasis from the speech amplifier resulting in an essentia...

Page 13: ...acity of Q402 in accordance with the audio voltage With a fixed phase shift shunting the stage and a variable phase shift through Q402 an overall variable phase shift is produced in the Output across L401 This Output is then coupled to the base of the first doubler Q403 Variable inductor L401 permits the modulator output to be maximized Frequency Multipliers The 12 MHz phase modulated signal from ...

Page 14: ...be bent at different angles without distroying its effectiveness This is completely insulated and cannot accidentally be shorted out but talking ränge of the radio should be shorter than normal of 1 4 wave length antenna SR CAT12 Flexible antenna This is 1 4 wave length antenna made by music wire SR CSA Base master This is the AC Battery charger for Ni Cd batteries This is able to Charge the Ni Cd...

Page 15: ...e alternator whine trouble and a UHF female connector on the case to connect the external antenna to the antenna connector on the radio SR C12 120 6 Charger This is a low cost type Ni Cd battery charger SR CAD Antenna adaptor This is a connector to connect the nornal antenna which has a UHF connector to the external anenna connector on the radio 13 ...

Page 16: ...IP DOUB DRIV POWER D MIC AMP RECEIVER LO OSC TRIP TRIP IDC INTEG RATOR ANT SWITCH ANT 2ND Loose RF IST IST 2ND 2ND 2ND 2ND AMP MIX IFAMP MIX IFAMP IFAMP IFAMP 2ND ifamp LIMIT DET NOISE AMP NOISE AMP SQL AMP POWER K PRE AMP DRIV SWITCH SWITCH TR TR 14 ...

Page 17: ...99 Ä 253V C03S ROSS S J VsXr036 100 S T 8 T 820 Vtt V i WAf R020 100 R045 39 NOISE AMP 0016 0017 CSI232B R063 56K R065 56 5 0V C092 p WMi t o 0 PER AMP 0013 SI252B SO 0018 CSI232B n OO8 15 IVER 6 0407 I232C PA 04O8 2SC730 ZOP L4II L4I2 C449 D40I EXT ANT sw 0410 2N364I CKG IN PUT J407 C469 4 7 SOO STD BY SW TRÄNS recv EXT SUPPLY J406 POWER SW O O SW 04 11 CSI294 F vG CRYSTAL LOCATION Rx 3 CH I 2 ar...

Page 18: ... 0012 CSI2S2C TRP 0013 CSI2S2C OSC 0014 CSI252B C072 IP II 057 5 7SV 22K CO70r wv co0o 200P y Oi R053 330K VWV ilQllil 0 88 888 LOI L0 4 vvvv 055 220 348 220 R052 220 OUBL 0403 CSI252C TRIP DUBL 0402 0404 040S C4I6 I20P O o O 045V Ms r o 4IO 8x8 MMr i R4J0 I00 5 4V R4I2 560 MIO AMP i 401 L0300I INTEGRATOR J405 fQ 0 409 CSI2S2B C462 470P I EXT M IC 6 43V ...

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