The Leo Bodnar GPSDO (GPS disciplined oscillator) precision reference
clock 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 Caesium 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 450HZ
AND 800MHZ. The output signal is a SQUARE WAVE at 3.3V CMOS levels
with 50Ω characteristic impedance.
The SMA | Mini USB 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.
IF I DON’T KNOW I NEED THIS, WHY DO I NEED THIS?
These units are a fantastic addition to the tool
WHAT’S THE DIFFERENCE BETWEEN THE TWO FORM FACTORS? WHICH ONE DO I
Other than input types, the BNC version notably has two clock
outputs. The second is limited to the identical or a fractional
multiple of the first frequency. In some instances, you may find
that two smaller units better suit your application. Most hobbyists
opt for the less expensive SMA version, but I prefer the BNC version
for workbench use (even for portable it’s not much bigger).
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. Software is available from
manufacturer website and Apple App Store.
GPS clock can be powered via USB from computer, charger or power bank.
USB connection to 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:
* Lab equipment, instrumentation, or RF transmitter
* Receiving equipment, RTL SDRs (28.8MHz) and band scanners
* Calibration source for radio receivers
* Master clock for audio and video equipment, DACs and studio
Form Factor: BNC | USB-B
Brand: Leo Bodnar
Signal Generator Type: RF Signal Generator
Frequency Range: 400Hz - 810Mhz