PLJ-096OLED-L1 RF Signal Frequency Counter User Manual

1. Konec produktuview

The PAREK PLJ-096OLED-L1 is a high-precision RF signal frequency counter module designed for a wide range of applications, including ham radio transceivers, RF test equipment, and educational instruments. It features a 0.96-inch OLED display for clear frequency readout, a stable VC-TCXO reference oscillator, and supports dual intermediate frequency (IF) offset modes.

Klíčové vlastnosti

• 100MHz Measurement Range: Capable of measuring frequencies from 1kHz to 100MHz.
• ±2.5ppm Stability: Utilizes a KDS/EPSON VC-TCXO reference oscillator for high accuracy.
• Dual IF Offset: Supports independent ±99.9999MHz offset with 100Hz step resolution.
• OLED displej: Features a 0.96-inch, 8-digit high-visibility OLED screen.
• Nízká spotřeba energie: Operates at approximately 30mA @5V, includes an electronic power switch.
• Rozhraní UART: Provides a serial port output for data logging and system integration.

2. Technické specifikace

The following table details the technical specifications of the PLJ-096OLED-L1 module:

The sensitivity of the module can vary slightly depending on the position of the sensitivity adjustment potentiometers. Refer to the test data for typical performance:

3. Nastavení a připojení

This section guides you through connecting the PLJ-096OLED-L1 module.

Obsah balení

• PLJ-096OLED-L1 Module ×1
• IPEX-to-SMA(M) Cable (15cm) ×1
• XH2.54-2P Power Cable (15cm) ×1

Připojení modulu

1. Připojení napájení: Connect the provided XH2.54-2P power cable to the [PWR] interface on the module. Connect the other end to a 4.5-9V DC power source (5V recommended).
2. Vstupní signál: Attach the IPEX-to-SMA(M) cable to the [RF IN] port on the module. Connect the SMA end to your RF signal source.
3. Serial Data Output (Optional): For data logging or integration with other systems, connect to the [UART] TTL serial interface. The baud rate is configurable.

4. Návod k obsluze

The module is controlled via two buttons, K1 and K2, and displays frequency on the OLED screen.

Základní operace

• Zapnutí/vypnutí: The module has an electronic power switch. Ensure proper voltage se dodává.
• Zobrazení frekvence: Once powered and a signal is applied to the RF IN, the frequency will be displayed on the OLED screen. The refresh rate is 0.64s for real-time monitoring.

Button Functions (K1 & K2)

• K1 (Setting/Confirmation Key): Used to enter settings menus and confirm selections.
• K2 (Adjustment Key): Used to navigate through options or adjust values within settings.

Dual IF Operation

The module supports dual intermediate frequency (IF) offset modes. This is particularly useful for transceivers where the displayed frequency needs to be offset from the actual received or transmitted frequency.

• Setting IF Offset: Use K1 and K2 to access and configure the IF1 and IF2 offset values. These can be set independently with a ± offset mode.
• Offsetový rozsah: Each IF can be offset by ±99.9999MHz in 100Hz steps.
• Ukládání nastavení: All settings, including IF offsets, are retained in EEPROM memory.

Výběr času brány

The gate time determines the measurement resolution and update speed.

• 0.64s Gate Time: Provides 10Hz resolution. Ideal for faster updates.
• 1.0s Gate Time: Provides 1Hz resolution. Offers higher precision for stable signals.
• Select the desired gate time using the K1 and K2 buttons in the settings menu.

Výstup dat UART

The module outputs frequency data via its TTL serial interface. The default format is: "FREQ:xxxx.xxx kHz\n".

This allows for external logging or integration with microcontrollers and other digital systems.

5. Údržba a kalibrace

VC-TCXO Calibration

• The module comes with a factory-calibrated VC-TCXO (Voltage Controlled Temperature Compensated Crystal Oscillator) with an accuracy of ±2.5ppm at 25°C.
• For field recalibration, a test point labeled TP1 is available on the PCB. This allows for fine-tuning the frequency reference if necessary, using appropriate test equipment.

Obecná péče

• Udržujte modul čistý a bez prachu a vlhkosti.
• Nevystavujte modul extrémním teplotám nebo přímému slunečnímu záření.
• Handle with care to prevent physical damage to the PCB or OLED display.

6. Řešení problémů

Běžné problémy a řešení

• No Display/Module Not Powering On:
  • Ověřte napájení objtage is within the 4.5-9V DC range (5V recommended) and correctly connected to the XH2.54-2P port.
  • Check for any short circuits or loose connections.
  • If the electronic switch fails, short-circuiting J1 on the PCB might bypass it (refer to Figure 4).
• Incorrect Frequency Reading:
  • Ensure the RF signal input is correctly connected to the IPEX (Gen1) port.
  • Check the input signal strength; the module has a typical sensitivity of -10dBm. Weak signals may not be accurately measured.
  • Verify IF offset settings are correct for your application. The default IF is 0 for direct frequency readout.
  • Consider recalibrating the VC-TCXO if significant drift is observed (see Section 5).
• Unstable Readings:
  • Ensure the input RF signal is stable and free from excessive noise.
  • Try adjusting the gate time setting; a longer gate time (1.0s) can provide more stable readings at the cost of update speed.

7. Uživatelské tipy

• Default IF Setting: Remember that the default Intermediate Frequency (IF) is set to 0. If you require an offset for your application (e.g., in a superheterodyne receiver), you must configure IF1 or IF2 using the K1 and K2 buttons.
• Trailing Zero Blanking: For signals above 1MHz, enabling trailing zero blanking in the settings can improve readability by suppressing unnecessary digits.
• UART Output for Logging: The UART serial output is a powerful feature for data logging. Connect it to a microcontroller or a serial-to-USB adapter to capture frequency readings over time for analysis. The output format is fixed to "FREQ:xxxx.xxx kHz\n".
• Power Supply Quality: Use a stable and clean 5V DC power supply for optimal performance and accuracy, especially in sensitive RF environments.

8. Záruka a podpora

For technical support, warranty claims, or further inquiries regarding the PLJ-096OLED-L1 frequency counter, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.