1. Introduction
The Astatic 636LB1 is a dynamic noise-canceling microphone designed for clear voice transmission in environments with high background noise. It is suitable for use with CB, Amateur Radio, and SSB communication systems. This microphone features a rugged construction and a 4-pin connection, making it ideal for close-talking handheld applications.
Figure 1: Front view of the Astatic 636LB1 microphone, showing the grille and Astatic logo.
2. Key Features
- Dynamic Noise Canceling: Reduces background noise for clearer voice transmission.
- 4-Pin Connection: Standard connector for compatibility with various CB and Amateur Radio equipment.
- Rubberized Housing: Provides a protective and comfortable grip.
- Polyurethane Coated Steel Grille: Durable screen protects the microphone element.
- Press-to-Talk (PTT) Lever: DPDT (Double Pole Double Throw) switch with spring return for reliable operation.
- Low Impedance Dynamic Element: Ensures consistent audio quality.
- Coiled Cord: Provides flexibility and extends reach while preventing tangles.
Figure 2: Side view illustrating the Press-to-Talk (PTT) lever on the microphone.
3. Setup and Installation
Follow these steps to connect your Astatic 636LB1 microphone to your radio equipment:
- Power Off Radio: Ensure your CB or Amateur Radio unit is powered off before connecting or disconnecting any accessories.
- Locate Microphone Port: Identify the 4-pin microphone input port on your radio. This is typically a circular connector.
- Connect Microphone: Align the 4-pin connector of the Astatic 636LB1 microphone with the radio's microphone port. Gently push the connector in and twist the locking ring clockwise until it is secure. Do not force the connection.
- Secure Microphone Hanger (Optional): If your radio or vehicle has a microphone hanger, place the microphone onto it for convenient storage when not in use.
- Power On Radio: Once the microphone is securely connected, you may power on your radio.
Figure 3: Detail of the 4-pin microphone connector.
4. Operating Instructions
The Astatic 636LB1 microphone is designed for straightforward operation:
- Holding the Microphone: Hold the microphone approximately 1 to 2 inches (2.5 to 5 cm) from your mouth. This close-talking technique maximizes the noise-canceling effect and ensures clear audio transmission.
- Transmitting: To transmit, press and hold the Press-to-Talk (PTT) lever located on the side of the microphone. Speak clearly into the microphone.
- Receiving: To receive incoming transmissions, release the PTT lever.
- Volume Adjustment: Adjust the audio output volume using the controls on your radio unit, not on the microphone itself.
5. Care and Maintenance
Proper care will extend the life and performance of your microphone:
- Cleaning: Wipe the microphone housing with a soft, damp cloth. Avoid using harsh chemicals or abrasive cleaners. Ensure no moisture enters the microphone grille.
- Storage: Store the microphone in a clean, dry environment when not in use. Avoid extreme temperatures.
- Cord Care: Do not excessively pull, twist, or stretch the coiled cord. Avoid kinking the cord, especially near the connectors, to prevent internal wire damage.
- Connector Inspection: Periodically check the 4-pin connector for any signs of corrosion or damage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No audio transmission | Microphone not properly connected. Radio not powered on. PTT lever not pressed. | Ensure 4-pin connector is fully seated and locked. Verify radio power. Press and hold PTT lever during transmission. |
| Poor audio quality / Excessive background noise | Microphone too far from mouth. Radio audio settings incorrect. Damaged microphone element. | Hold microphone 1-2 inches from mouth. Adjust radio's microphone gain/sensitivity. If problem persists, contact support. |
| PTT lever stuck or unresponsive | Debris in switch mechanism. Internal switch failure. | Gently inspect for obstructions. Do not attempt to disassemble. Contact support if switch is faulty. |
7. Specifications
| Microphone Type | Dynamic, Noise Canceling |
| Frequency Response | 100 to 5000 Hz |
| Impedance | 200 Ohms |
| Connector | 4-Pin Standard |
| Housing Material | Rugged ABS with Rubberized Coating |
| Grille Screen | Polyurethane Coated Steel |
| Dimensions (H x W x D) | 3-15/16" x 2-31/32" x 2-5/8" (approx. 100mm x 75mm x 67mm) |
| Weight | 10 oz (approx. 283 g) |
| Polar Pattern | Unidirectional |
| Signal-to-Noise Ratio | 60 dB |
8. Warranty Information
Specific warranty details for the Astatic 636LB1 microphone are typically provided with the product packaging or can be obtained from the manufacturer's official website. Please retain your proof of purchase for warranty claims.
For information regarding extended protection plans, please refer to the retailer where the product was purchased.
9. Customer Support
If you require further assistance or have questions not covered in this manual, please contact Astatic customer support through their official website or the contact information provided with your product.
You can visit the Astatic Store for more information: Astatic Official Store
