The new model LB-1420 with USB-C input is in stock! Fast delivery to both coasts shipped from Texas.

The Leo Bodnar locked clock source is a cost-effective and simple mechanism to stay on frequency.

This clock outputs a low-jitter reference signal frequency-locked to GPS. High accuracy GPS Cesium references provide long term output signal stability, while an internal TCXO (temperature-compensated crystal oscillator) source provides a high-quality, low phase noise clock signal with sub-picosecond RMS jitter.

 

Digital PLL enables many output reference frequencies between 1 Hz and 1.1 GHz. The output signal is a square wave at 3.3 V CMOS levels with 50 Ω characteristic impedance. 


The SMA | USC-C form factor case is approximately 2 1/4" x 1 1/2" x 5/8".  The BNC | USB-B form factor case is approximately 3 1/2" x 2 1/4" x 1". 


Includes an active GPS antenna (5m length with magnetic base) but supports other active or passive antennas. Also includes USB cable for power and initial configuration.


If I don't know I need this, why do I need this?  

These units are a fantastic addition to the tool kit: https://www.youtube.com/watch?v=p-NUnCnOHHI

What's the difference between the form factors?  Which one do I want?

Other than input types, the BNC version notably has two clock outputs. The second is limited to the identical or fractional multiple of the first frequency. You may find that two smaller units better suit some applications. Many hobbyists opt for the less expensive SMA version, but consider the BNC version for workbench use (for portable it is not much bigger).

Technical details

Output drive has four settings. Output power level (10MHz):

+10.3dBm (32mA), +9.9dBm (24mA), +9.0dBm (16mA), +6.4dBm (8mA)

 

Typical phase noise at 10MHz output:

-70 dBc/Hz (1 Hz), -100 dBc/Hz (10 Hz), -125 dBc/Hz (100 Hz), -145 dBc/Hz (1 kHz), -150 dBc/Hz (10 kHz), -153 dBc/Hz (100 kHz), -155 dBc/Hz (1 MHz)


USB power draw is 5V 250mA.  The BNC | USB-B version also accepts an external 5-12VDC power input (2.5mm inner pin | 5.5mm outer diameter).

 

Operation requires a GPS signal, however temporary loss is tolerated seamlessly. GPS acquisition time after power-up approximates 30 seconds. If GPS signal is lost, digital PLL maintains the best estimated output frequency based on historical data. On reacquisition of GPS lock, output is seamlessly brought back in sync with the GPS reference. Entry and exit of frequency hold occurs without glitch.

 

All frequency and output settings are user-configurable via USB connection from Windows or MacOS. Firmware updates and configuration software is available from the manufacturer website. A MacOS app is on the Apple App Store and a Linux utility is available at https://github.com/hamarituc/lbgpsdo.

 

The GPS clock can be powered via USB from computer, charger or power bank. USB connection to a computer is required only for initial or reconfiguration. Settings are stored inside the device and maintain values when off.

 

The SMA antenna connector voltage is 3.3V. Most active antennas work on a wide range - 2.5v to 5v because internal analogue LNA is not sensitive to power level.


Reference clock use cases:

IC-9700 


For Icom IC-9700 owners, the High Stability Kit option bundles a Reference Injection Board and 0.3m SMA male-to-male cable with an SMA | USB-C form factor unit.