Introduction
The Stryker SR-655HPC is a high-performance 10 Meter Amateur Radio designed for reliable and clear long-range communication. This radio features a unique design for high power output, utilizing four IRF-520 MOSFET transistors to achieve 60+ watts PEP. It is equipped with an 8-color LED-backlit faceplate with dimmer control, ensuring comfortable viewing in various lighting conditions. The SR-655HPC supports AM, FM, and SSB modes, and includes advanced features such as variable transmit frequency response, receiver tone control, digital echo, and multiple Roger beeps.
Figure 1: Stryker SR-655HPC 10 Meter Amateur Radio with connected microphone.
Key Features
- High Power Output: Utilizes four FQP13N10 MOSFET transistors for 70W PEP.
- Multi-Mode Operation: Supports AM, FM, and SSB.
- Brilliant 7-Color LED Backlit Faceplate: User-selectable colors or automatic scanning, with 32-position dimmer control.
- Advanced Audio Features: Loud & Clear Receiver, Excellent Stock Mic, Digital Echo with dual front-mounted controls, Variable Talkback Control, Six Roger Beeps.
- Frequency Control: Advanced Clarifier, VFO (Variable Frequency Oscillator), PC Programmable.
- Up-Armored Receiver: Exclusive receiver protection for superior adjacent channel rejection, even in high-interference environments.
- Digital Frequency Display: 7-Color frequency display.
Setup and Installation
Proper setup is crucial for optimal performance and safety. Ensure all connections are secure before powering on the unit.
1. Power Connection
Connect the radio to a stable 13.8V DC power source. A 14.2V source is recommended for best performance. Ensure correct polarity (red to positive, black to negative) to prevent damage to the unit.
2. Antenna Connection
Connect a suitable 10-meter amateur radio antenna to the UHF SO239 connector on the rear of the radio. Use high-quality coaxial cable with proper impedance (typically 50 ohms) for efficient power transfer and minimal signal loss. Ensure the antenna is properly tuned for the 10-meter band.
3. Microphone Connection
Plug the supplied microphone into the front microphone jack. Ensure the connector is fully seated.
4. Initial Power On
Once all connections are made, turn the radio on using the ON/OFF/Volume control. The display should illuminate.
Figure 2: Front panel layout of the SR-655HPC, illustrating various controls and the display.
Operating Instructions
This section details the functions of the various controls and how to operate your SR-655HPC radio.
Figure 3: Detailed diagram of SR-655HPC controls and their functions, as depicted on the product packaging.
Basic Operation
- ON/OFF & Volume: Rotate the leftmost knob to turn the radio on/off and adjust the receiver audio volume.
- Squelch (SQ): Adjust the SQ knob to eliminate background noise when no signal is present. Turn clockwise until the noise disappears.
- Mode Control (AM/FM/SSB): Select the desired modulation mode using the dedicated switch.
- Frequency Control: Use the main FREQUENCY knob to tune to the desired operating frequency. The VFO function allows continuous frequency adjustment.
- Band Selection: The radio supports multiple frequency bands (A-L, VFO). Refer to the manual for specific band ranges.
Advanced Controls
- Dimmer Control: The DIM knob adjusts the brightness of the LED display and backlighting (32 positions).
- Digital Echo: Use the ECHO and DELAY knobs to adjust the echo effect for your transmitted audio.
- Roger Beeps: The radio features six selectable Roger beeps. Activate and select them via the PRG/RB button.
- Variable Power Control: Adjust your transmit power output using the PWR control.
- Variable Talkback Control: The TALKBACK control allows you to monitor your own transmitted audio.
- Clarifier: The CLARIFIER knob provides fine-tuning for SSB reception to ensure clear audio.
- Noise Blanker (NB) / Automatic Noise Limiter (ANL): These functions reduce impulse noise and continuous noise respectively.
- PC Programmable: The radio can be programmed via a PC for advanced customization. Refer to the separate PC programming guide for details.
- Display Color: Press the COLOR button to cycle through the 7 available LED display colors.
Figure 4: Examples of the multi-color LED display options on the SR-655HPC.
Maintenance
To ensure the longevity and optimal performance of your Stryker SR-655HPC, follow these maintenance guidelines:
- Cleaning: Regularly wipe the exterior of the radio with a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, but ensure no moisture enters the unit. Avoid abrasive cleaners or solvents.
- Ventilation: Ensure the radio's ventilation fins are clear of dust and obstructions to prevent overheating. Do not operate the radio in enclosed spaces without adequate airflow.
- Connections: Periodically check all cable connections (power, antenna, 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.
Troubleshooting
If you encounter issues with your SR-655HPC, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power | Loose power connection, blown fuse, incorrect voltage. | Check power cable connections. Verify power source voltage. Inspect and replace fuse if necessary. |
| No Receive Audio | Volume too low, squelch set too high, antenna disconnected. | Increase volume. Reduce squelch level. Check antenna connection. |
| Poor Transmit Audio | Microphone not connected properly, microphone gain too low/high. | Ensure microphone is fully plugged in. Adjust MIC GAIN control. |
| Excessive Noise on Receive | Squelch too low, NB/ANL off, external interference. | Increase squelch. Activate NB/ANL. Identify and mitigate external noise sources. |
If the problem persists after attempting these solutions, contact Stryker customer support or a qualified technician.
Specifications
| Frequency Range | 28.000-29.700MHz & 24.890–24.990MHz |
| Frequency Bands | A, B, C, D, E, F, G, H, I, J, K, L & VFO |
| Channels | 40 (programmable) in each band |
| Input Voltage | 13.8V (14.2V recommended) |
| Antenna Connector | UHF SO239 |
| Frequency Control | Phase-Locked-Loop Synthesizer |
| Frequency Step | 100Hz/1KHz/10KHz/100KHz/1MHz |
| Frequency Tolerance | 0.005% |
| Frequency Stability | 0.001% |
| Temperature Range | -20°C to +50°C |
| Dimensions (W x H x D) | 7-7/8"W x 2-3/8"H x 9-1/4"D (approx. 17 x 9 x 3 inches) |
| Item Weight | 5.79 pounds |
| Output Power | 60+ watts PEP (up to 70W PEP) |
Warranty and Support
The Stryker SR-655HPC 10 Meter Radio comes with a warranty from its respective manufacturer. For warranty claims or technical support, please refer to the documentation included with your product or visit the official Stryker website. 10-Meter Radios are intended for use by amateur radio operators only, and a license from the FCC is required for operation in the United States.
Figure 5: Important note regarding the radio's classification.
