Introducció
This manual provides essential information for the proper setup, operation, and maintenance of your Astatic 302-AST878DM CB Desk Microphone. Please read this manual thoroughly before using the product to ensure optimal performance and longevity.

Imatge: Frontal view of the Astatic 302-AST878DM CB Desk Microphone, showcasing its black finish and base.
Informació important de seguretat
ADVERTÈNCIA: Aquest producte conté substàncies químiques que l'estat de Califòrnia sap que causen càncer i defectes congènits o altres danys reproductius. Per a més informació, visiteu www.P65Warnings.ca.gov.
- Do not expose the microphone to extreme temperatures, moisture, or direct sunlight.
- Handle the microphone with care to prevent damage to internal components.
- Ensure proper wiring to your CB radio. Incorrect wiring can cause damage to the microphone or radio.
- Mantenir fora de l'abast dels nens.
Contingut del paquet
Verifiqueu que hi hagi tots els elements en desempaquetar:
- Astatic 302-AST878DM CB Desk Microphone
- Manual d'usuari (aquest document)

Image: Retail packaging for the Astatic 302-AST878DM CB Desk Microphone.
Característiques del producte
- Rugged Cycolac Resin Housing: Provides durability for industrial and commercial applications.
- Standard Push-to-Talk (PTT) and Lock-to-Talk Buttons: Per a un funcionament còmode.
- High Quality Omni Directional Ceramic Cartridge: Ensures clear audio transmission.
- 5 Conductor Shielded Standard Astatic Color Coded Cable: Designed for reliable connection.
- Connector de 4 pins: Standard connector for CB radios.
- Funciona amb bateria: Requires one standard 9-Volt battery (not included).
Instruccions de configuració
1. Instal·lació de la bateria
- Locate the battery compartment on the underside of the microphone base.
- Obriu la coberta del compartiment.
- Insert one (1) standard 9-Volt battery, ensuring correct polarity.
- Tanqueu bé la tapa del compartiment de la bateria.
2. Connecting to your CB Radio
The Astatic 302-AST878DM is equipped with a 4-pin connector. It is crucial to ensure proper wiring for your specific CB radio model. Many CB radios have different wiring configurations. Incorrect wiring can lead to malfunction or damage.
- Consult your CB radio's instruction manual for its specific microphone wiring diagram.
- If the microphone's 4-pin connector does not match your radio's wiring, professional assistance may be required for re-wiring.
- Carefully plug the 4-pin connector into the microphone input jack on your CB radio.

Image: The Astatic 302-AST878DM CB Desk Microphone showing its coiled cable and 4-pin connector.
Instruccions de funcionament
Funció Premeu per parlar (PTT)
- To transmit, press and hold the PTT button located on the microphone base.
- Parleu clarament al micròfon.
- Deixeu anar el botó PTT per aturar la transmissió i tornar al mode de recepció.
Lock-to-Talk Function
- To engage continuous transmission, press the "LOCK" button on the microphone base.
- The microphone will remain in transmit mode without needing to hold the PTT button.
- To disengage, press the "LOCK" button again.
Nota: Always ensure the microphone is properly connected and powered before operation. Adjust your CB radio's microphone gain (if available) for optimal audio quality.
Manteniment i cura
- Neteja: Use a soft, dry cloth to clean the exterior of the microphone. Do not use liquid cleaners or solvents.
- Substitució de la bateria: Replace the 9-Volt battery when audio quality degrades or the microphone stops transmitting.
- Emmagatzematge: Store the microphone in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods.
- Cura del cable: Avoid sharp bends or kinks in the coiled cable to prevent internal wire damage.
Resolució de problemes
| Problema | Causa possible | Solució |
|---|---|---|
| No audio transmission / Weak audio |
|
|
| Àudio distorsionat |
|
|
| PTT or Lock-to-Talk buttons not responding |
|
|
If the issue persists after attempting these solutions, please contact Astatic customer support.
Especificacions
| Característica | Detall |
|---|---|
| Número de model | 302-AST878DM |
| Factor de forma del micròfon | Table Array (Desk Microphone) |
| Patró polar | Omnidireccional |
| Sensibilitat d'àudio | 56 decibels |
| Ràtio senyal / soroll | 60 dB |
| Tecnologia de connectivitat | Auxiliar |
| Tipus de connector | 4 pins |
| Font d'alimentació | Battery Powered (1 x 9V battery required, not included) |
| Material | Cycolac Resin, Ceramic |
| Color | Negre |
| Pes de l'article | 1.65 lliures (aprox. 0.75 kg) |
| Dimensions del producte (L x A x A) | 4.9 x 8.2 x 10.8 polzades (aprox. 12.4 x 20.8 x 27.4 cm) |
| Dispositius compatibles | CB Radio (requires proper wiring) |
Garantia i assistència al client
For warranty information or technical assistance, please refer to the official Astatic weblloc web o contacteu directament amb el seu servei d'atenció al client. Conserveu el rebut de compra com a comprovant de compra.
Fabricant: Astàtica
Weblloc: www.astaticmics.com (Example, real URL pot variar)




