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Cobra HH36ST manual

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Table of contents for the manual

  • Page 1

    OPERA TING INSTRUCTIONS FOR Y OUR 40 CHANNEL CITIZENS B AND SSB/AM 2-W A Y MOBILE RADIO Model 148 GTL PRINTED IN CHINA ©2002 COBRA ELECTRONICS CORPORA TION 480-046-P 6500 WEST CORTLAND STREET CHICAGO, IL 60707 USA Nothing comes close to a Cobr a™[...]

  • Page 2

    Serial No. Date of Purchase Dealer Name Keep this manual for detailed information about your Cobra CB Radio System. SA VE YOUR SALES RECEIPT , THE CAR TON AND “P ACKING” FOR POSSIBLE FUTURE USE. If Y ou Think Y ou Need Service, please contact your local dealer . T he Cobra ® line of quality products includes: CB radios microT ALK ® r adios Ra[...]

  • Page 3

    Section I Intr oduction FREQUENCY RANGE T he COBRA 148GTL transceiver represents one of the most ad vanced SSB/AM two-wa y radios ever designed for use as a Class D station in the Citizens Radio Service. This unit features ad vanced Phase Loc k Loop (PLL) circuitry , whic h is used in the AM mode and in the upper and lower single sideband modes, pr[...]

  • Page 4

    RECEIVER Sensitivity SSB: 0.25 µ V for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 µ V for 10 dB (S+N)/ at greater than 1/2- w att of audio output. Selectivity AM: 6dB @ 3 KHz, 50 dB @ 9 KHz. SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz. Image Rejection More than 65 dB. IF F requency AM: 7.8 MHz 1st IF , 455 KHz 2nd IF . SSB: 7.8 MHz. [...]

  • Page 5

    Section III Installation (Continued) IGNITION NOISE INTERFERENCE Use of a mobile receiver at lo w signal levels is normally limited by the presence of electrical noise. The primary sour ce of noise in automobile installations is from the generator and ignition system in the vehicle. Under most oper ating conditions, w hen signal level is adequate, [...]

  • Page 6

    Section III Installation (Continued) D. T ry a different location on your car (keeping in mind the radiation pattern y ou wish). E. Is the antenna perfectly vertical? F. T ry a different location in your neighborhood. Sta y awa y from large metal objects when adjusting (metal telephone or light posts, fences, etc.). NOTE T he COBRA 148GTL will oper[...]

  • Page 7

    10 Section IV Oper ation (Continued) 4. SWR CAL CONTROL (outer dual concentric) . In order for y ou to achieve maximum radiated power and the longest r ange, it is important that your antenna be in good condition, properly adjusted and matched to y our transceiv er . T he Built-in SWR (standing wav e ratio) meter lets you easily measure your antenn[...]

  • Page 8

    Section IV Oper ation (Continued) B. INDICA TOR FUNCTIONS 1. S-METER. Swings proportionally to the strength of the incoming signal. 2. RF METER . Swings proportionally to the RF output power . 3. SWR METER . Swings proportionally to the ratio of standing wav e voltage and RF output. Used to properly adjusts the length of the antenna, and to monitor[...]

  • Page 9

    Section IV Oper ation (Continued) pitched w histle or a high-pitched whistle) y ou will hear the increase in the output tone of the receiver . If the incorrect mode is selected, an increase in tone of a w histle applied to the transmitter will cause a decrease in the resultant tone from the receiver . T hus when a voice is used in place of a w hist[...]

  • Page 10

    Section IV Oper ation (Continued) Fig. 2. Microphone Cable Preparation. To wire the microphone cable to the plug provided, proceed as follows: Fig. 3 . Microphone plug wiring. 1. Remove the retaining screw . 2. Unscrew the housing from the pin receptacle body . 3. Loosen the two cable clamp retainer screws. 4. F eed the microphone cable through the[...]

  • Page 11

    18 Section V Maintenance and Adjustment T he COBRA 148GTL transceiver is specifically designed for the en vironment encountered in mobile installations. The use of all solid state cir cuitry and its light weight result in high reliability . Should a failure occur , however , replace parts only with identical parts. Do not substitute. Refer to the s[...]

  • Page 12

    Section VI Appendix (Continued) A FEW RULES THA T SHOULD BE OBEYED 1. Y ou are not allowed to carry on a conv ersation with another station for more than five minutes at a time without taking a one-minute break, to gi ve others a chance to use the c hannel. 2. Y ou are not allowed to blast others off the air by o ver -powering them with illegally a[...]

  • Page 13

    INSTRUCCIONES DE USO DEL 40 C ANALES RADIO BIDIRECCION AL MÓVIL SSB/AM DE B AND A CIUD AD AN A Modelo 148 GTL IMPRESO EN CHINA ©2002 COBRA ELECTRONICS CORPORA TION 480-046-P 6500 WEST CORTLAND STREET CHICAGO, IL 60707 USA Nada se compar a a Cobr a™[...]

  • Page 14

    Instrucciones de uso del RADIO BIDIRECCIONAL MÓVIL SSB/AM DE 40 C ANALES DE BAND A CIUD AD ANA Modelo 148 GTL Índice Página Sección I: Introducción ................................................................................................ 2 Sección II: Especificaciones ....................................................................[...]

  • Page 15

    Sección II Especificaciones GENERALES Canales 40 AM, 40 LSB , 40 USB. Intervalo de frecuencias 26,965 a 27,405 MHz. Control de frecuencia Sintetizador de sincronización de fase (PLL). T olerancia de frecuencia 0.005%. Estabilidad de frecuencia 0.001%. T emperatura oper ativa -30° C a +50° C (-22° F a +122° F). Micrófono Dinámico, de conexi?[...]

  • Page 16

    Sección III Instalación LUGAR Antes de iniciar la instalación, determine dónde colocará el transmisor -receptor y el soporte del micrófono. Busque un lugar donde la unidad pueda operarse fácilmente y no interfiera con el conductor o los pasajeros del vehículo. En un automóvil, el transmisor -receptor por lo general se monta debajo del tabl[...]

  • Page 17

    Sección III Instalación (continuación) AJUSTE DE LA ANTENA P ARA OBTENER LA RELACIÓN ÓPTIMA OND A EST ACION ARIA (SWR) Dado que hay tanta v ariedad entre las antenas base y móviles, esta sección abarca exclusiv amente los diversos tipos de antenas móviles ajustables. La longitud de la antena tiene una relación directa con la frecuencia del[...]

  • Page 18

    Sección IV Oper ación CONTROLES E INDICADORES En el panel delantero del radio COBRA 148GTL ha y 13 controles y tres indicadores. A. FUNCIONES DE CONTROL 1. ENCENDIDO, AP AGADO Y VOLUMEN (OFF/ON/VOLUME) (parte interior del control doble concéntrico). Gire la perilla en sentido horario par a encender la unidad y ajustar el volumen. Durante la oper[...]

  • Page 19

    11 Sección IV Oper ación (continuación) 10. INTERRUPTOR DE SISTEMA DE AL TA VOZ Y BAND A CIUDAD ANA (P A/CB). Selecciona la modalidad operativ a. Cuando este selector está en la posición CB (banda ciudadana), se desactiv a el sistema de altavoz (P A) y la unidad transmite y recibe utilizando el altoparlante conectado. En la modalidad de sistem[...]

  • Page 20

    Sección IV Oper ación (continuación) 6. Escuche el ruido de fondo en el altoparlante. Gire el control de ruido de fondo (SQUELCH) lentamente en sentido horario justo hasta que desaparezca el ruido (no debe haber señal presente). Deje el control en esta posición. La reducción de ruido de fondo (SQUELCH) ha sido ajustada en forma correcta. El r[...]

  • Page 21

    Sección IV Oper ación (continuación) MICRÓFONOS AL TERNA TIVOS E INST ALACIÓN Pa ra obtener los mejores resultados, el usuario debe seleccionar un micrófono dinámico de baja impedancia o un micrófono transistorizado. Los micrófonos transistorizados tienen una característica de baja impedancia de salida. Los micrófonos deben tener un cabl[...]

  • Page 22

    Sección IV Oper ación (continuación) F igur a 4. Números de pata de la clavija del micrófono, visto desde la parte trasero del receptáculo de las patas. Compruebe que la estructura y el anillo de la figura 3 estén hacia atrás, sobre el cable del micrófono, antes de comenzar a soldar . Si la arandela no está cautiva en el cuerpo del recept[...]

  • Page 23

    19 Sección VI Apéndice Los operadores de radios de la banda ciudadana han adoptado el “código 10” par a las preguntas y respuestas más usuales. Esto permite una comunicación más rápida y may or comprensión en áreas ruidosas. En la siguiente tabla se enumeran varios de los códigos más usuales y su significado: CÓDIGO 10 Código Signi[...]

  • Page 24

    Sección VI Apéndice (continuación) 21 UTILICE EL CAN AL 9 ÚNICAMENTE P ARA MENSAJES DE EMERGENCIA La Comisión F ederal de Comunicaciones de Estados Unidos (FCC) ofrece los siguientes ejemplos de los tipos de comunicación permitidos y prohibidos en el canal 9. Recuerde que estos ejemplos son únicamente pautas y no son exhaustiv os: P ermitido[...]