1. Introduction
The Galaxy DX-2547 is a high-performance AM/SSB CB Base Station engineered for reliable communication. This manual provides detailed instructions for the setup, operation, and maintenance of your DX-2547 radio, ensuring you can utilize all its advanced features effectively. Please read this manual thoroughly before operating the unit.
2. What's in the Box
Upon unpacking, please verify that all the following items are included:
- Galaxy DX-2547 CB Base Station
- Handheld Microphone
- Mounting Hardware
- AC Power Cord
- DC Power Cord
- Service Manual
- Operator's Manual (this document)
3. Key Features
- 40 Channel AM/SSB 120V AC Base Station CB
- Automatic "No Calibrate" SWR Meter
- Variable RF Output Power & Talkback controls
- Switchable Roger Beep
- Six-digit Frequency Display
- Modulation meter function
- Operates on both 120 volts AC and 12 volts DC
- Flip-Up Feet for Adjustable Viewing Angle
- Front Mic Jack and Headphone Jack
- Large, Easy-to-Read Meter with Power Output, Modulation Percentage, Signal Strength, and SWR Scales
- High SWR Alert Circuit with Warning LED
- Variable Dimmer Control
- Instant Access to Channels 9 and 19
- Separate Buttons for Noise Blanker (NB) and Automatic Noise Limiter (ANL)
- Galaxy Noise Filter (GNF) Circuit
- Clarifier Circuit with On/Off Switch and Variable Tone Control for Receive
- Rear Jacks for External Speaker and Public Address Use
4. Product Overview
Figure 1: Front Panel of the Galaxy DX-2547 CB Base Station
4.1 Front Panel Controls and Indicators
- POWER Button: Turns the radio on or off.
- TALKBACK Knob: Adjusts the volume of your own voice heard through the speaker during transmission.
- PHONES Jack: 3.5mm jack for connecting headphones.
- MIC Jack: 4-pin connector for the included handheld microphone.
- RF POWER Knob: Controls the radio frequency output power.
- SWR MOD PWR Selector: Selects the function of the large meter to display SWR, Modulation Percentage (AM), or Power Output.
- MIC RF Knob: Adjusts microphone gain and RF gain for reception.
- DIM TONE Knob: Controls the brightness of the display and the tone of the received audio.
- R.B. (Roger Beep) Switch: Activates or deactivates the Roger Beep tone, which sounds at the end of your transmission.
- PA Switch: Switches the radio to Public Address mode when an external PA speaker is connected.
- CHANNEL Knob: Selects the desired operating channel (1-40).
- RX/TX Indicator: Green LED illuminates during reception (RX), Red LED illuminates during transmission (TX).
- SWR ALERT Indicator: Red LED illuminates to warn of high SWR (Standing Wave Ratio).
- ANL Button: Activates the Automatic Noise Limiter to reduce impulse noise.
- NB Button: Activates the Noise Blanker to further reduce impulse noise.
- GNF Button: Activates the Galaxy Noise Filter, designed to improve clarity on weak signals.
- CLARIFIER Button: Engages the Clarifier circuit for fine-tuning SSB reception.
- USB AM LSB Mode Selector: Selects the operating mode: Upper Sideband (USB), Amplitude Modulation (AM), or Lower Sideband (LSB).
- CLARIFIER Knob: Fine-tunes the receive frequency in SSB mode.
- NORMAL 9 19 Selector: Provides instant access to Channel 9 (emergency) or Channel 19 (travelers' information).
- SQUELCH Knob: Eliminates background noise when no signal is present.
- VOLUME Knob: Adjusts the audio output level.
- Frequency Counter Display: Shows the precise operating frequency in six digits.
- S-Meter/Power Meter: Displays received signal strength (S-units), power output, modulation percentage, and SWR.
4.2 Rear Panel Connections
- Antenna Connector: Standard SO-239 connector for connecting your CB antenna.
- External Speaker Jack: For connecting an optional external speaker.
- PA Speaker Jack: For connecting an optional Public Address speaker.
- AC Power Input: For connecting the 120V AC power cord.
- DC Power Input: For connecting the 12V DC power cord.
5. Setup Instructions
- Placement: Place the DX-2547 on a stable, flat surface. Utilize the flip-up feet for an adjustable viewing angle if desired. Ensure adequate ventilation around the unit.
- Antenna Connection: Connect a properly tuned CB antenna to the antenna connector on the rear panel. Use high-quality coaxial cable.
- Power Connection:
- For AC Operation (120V): Connect the supplied AC power cord to the AC input on the rear panel and plug it into a standard 120V AC outlet.
- For DC Operation (12V): Connect the supplied DC power cord to the DC input on the rear panel. Ensure correct polarity (+ to + and - to -) when connecting to a 12V DC power source.
- Microphone Connection: Plug the handheld microphone into the MIC jack on the front panel.
- Optional Connections: If using an external speaker or PA speaker, connect them to their respective jacks on the rear panel.
6. Operating Instructions
6.1 Basic Operation
- Power On: Press the POWER button. The display and meter should illuminate.
- Volume Adjustment: Turn the VOLUME knob clockwise to increase the audio level.
- Squelch Adjustment: With no signal present, turn the SQUELCH knob clockwise until the background noise disappears. Turn it slightly counter-clockwise to the point where the noise just returns, then slightly clockwise again to silence it. This is the optimal squelch setting.
- Channel Selection: Rotate the CHANNEL knob to select your desired operating channel (1-40). The selected channel number will appear on the display. For instant access, use the NORMAL 9 19 selector.
- Mode Selection: Use the USB AM LSB selector to choose your desired modulation mode: AM (Amplitude Modulation) for standard CB communication, or USB/LSB (Upper/Lower Sideband) for single sideband communication.
6.2 Advanced Controls
- RF Power: Adjust the RF POWER knob to control your transmission output power.
- Talkback: Use the TALKBACK knob to monitor your own voice during transmission. Adjust to a comfortable level.
- Noise Reduction (ANL/NB/GNF): Experiment with the ANL, NB, and GNF buttons to reduce various types of noise. ANL is effective against impulse noise, NB against ignition noise, and GNF for general background noise on weak signals.
- Clarifier (SSB): In USB or LSB mode, use the CLARIFIER knob to fine-tune the incoming signal for clear audio. Press the CLARIFIER button to engage or disengage the circuit.
- Dimmer/Tone: The DIM TONE knob adjusts display brightness and the audio tone of received signals.
- Roger Beep: Activate the R.B. switch if you wish to transmit a short tone at the end of your transmission.
- PA Function: If an external PA speaker is connected, press the PA switch to use the radio as a public address system.
7. Maintenance
To ensure the longevity and optimal performance of your Galaxy DX-2547, follow these simple maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the radio. Do not use abrasive cleaners or solvents.
- Ventilation: Ensure that the ventilation slots on the radio are not obstructed to prevent overheating.
- Connections: Periodically check all cable connections (antenna, power, microphone) to ensure they are secure and free from corrosion.
- Storage: When not in use for extended periods, store the radio in a cool, dry place, away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you experience issues with your DX-2547, consult the following table for common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord disconnected; Blown fuse; Power outlet issue | Check power connections; Replace fuse (refer to service manual); Test power outlet |
| No reception or weak reception | Squelch too high; Antenna issue; Mode incorrect | Adjust squelch; Check antenna connection/SWR; Ensure correct AM/SSB mode selected |
| Poor transmission quality | Microphone issue; High SWR; RF Power too low | Check microphone connection; Verify SWR is low; Increase RF Power |
| High SWR Alert LED on | Antenna mismatch; Damaged coax cable | Check antenna tuning; Inspect/replace coax cable. Do not transmit with high SWR. |
| SSB frequency drift | Radio not warmed up; Environmental factors | Allow radio to warm up for 10-15 minutes; Use Clarifier for fine-tuning. |
If the problem persists after trying these solutions, please contact Galaxy customer support or a qualified service technician.
9. Specifications
| Specification | Value |
|---|---|
| Product Dimensions | 11.5 x 11.15 x 4.25 inches |
| Item Weight | 10.7 pounds |
| Model Number | DX-2547 |
| Brand | Galaxy |
| Number of Channels | 40 (CB) |
| Frequency Range | 26.965 MHz - 27.405 MHz |
| Talking Range Maximum | 20 Mile (dependent on conditions) |
| Tuner Technology | Analog |
| Voltage | 12 Volts (DC) / 120 Volts (AC) |
| Water Resistance Level | Not Water Resistant |
| Color | Red (display) |
10. Warranty and Support
The Galaxy DX-2547 CB Base Station comes with a Two Year Limited Warranty from the manufacturer. For warranty claims or service, please refer to the contact information provided with your purchase or on the official Galaxy website.
Legal Disclaimer: 10 Meter Radios come with a warranty from their respective manufacturer. Returns are not accepted by HKtronikz, but should be handled by their respective warranty center.
11. Additional Resources
For further detailed information, you may refer to the official PDF User Manual:
