Our stateside reseller still have stock http://airspy.us 

LeoNTP is a Stratum 1 Master Clock / Time server with GPS synchronised clock source designed from the ground up with the sole purpose of providing a cost effective but highly accurate and extremely high performing networked time server. Extremely easy to setup and configurable with flexible power options USB/PoE (802.3af) it can provide accurate synchronised time for your LAN, WAN, CCTV, PLC, Telephone systems or anywhere accurate standalone time is required.

Now available in a 1U rackmount for a single or triple units.  The Rack mount kit is a factory fitted option and cannot be ordered separately and retrofitted. Provided with a set of caged nuts and screws.
Triple units can sustain 300Mbps (> 300,000 NTP Packets a second) fed via a suitable load balancer. 

Single unit 1U Rackmount version is supplied with a single LeoNTP.
Triple unit 1U Rackmount version is supplied with three independent LeoNTP's and a suitable 3 way antenna splitter (See images) and cables.

Traditional Master Clocks either have high performance or low cost. With LeoNTP you can have both in the same package.

Key Features

  • True Stratum 1 NTP Compatible Master Clock / Time Server.
  • Can serve tens of thousands of clients.
  • Very cost effective
  • Supports NTP/SNTP
  • Front OLED Display for time display and configuration

10/100Mb RJ45 Autosensing


NTP V2, V3, V4, SNTP V3, V4

NTP Requests/sec

>100K (Wire speed) per unit.
> 1million concurrent clients typical


72 Channel
-167dBm Sensitivity
Power for active antenna supplied via bias tee.


USB/ 48V PoE 802.3af

Timing Performance

GPS Accuracy

30ns RMS, 60ns 99%
Cold Start acquisition < 30s

NTP Accuracy

< 1µS

Hold over on loss of GPS signal

Typically 1-4ms in 24 hours
Reverts to Stratum 16 after 24 hours with no GPS

Mechanical Dimension

80mm x 150mm x 25mm

BNC Output

PPS/1Mhz/10Mhz Accuracy 30ns RMS, 60ns 99%


1 year RTB
Lifetime Firmware updates and support.

In The Box (Single Unit)

1 x LeoNTP Device
1 x GPS Puck Antenna with 3 meter cable
1 x USB Cable
1 x 2 meter RJ45 Patch Cable

In The Box (1U Rack Unit)

1 x LeoNTP Device in 1U Rack Panel
1 x GPS Puck Antenna with 3 meter cable
1 x USB Cable
1 x 2 meter RJ45 Patch Cable

In The Box (3U Rack Unit)

3 x LeoNTP Device in 1U Rack Panel
1 x GPS Puck Antenna with 3 meter cable
3 x USB Cable
3 x 2 meter RJ45 Patch Cable
1 x 3 way GPS Antenna Splitter

See associated items for external timing antenna and BNC to MCX cables.


LeoNTP Manual
LeoNTP Quick Specs
Latest Firmware

Frequently Asked Questions:

Q/ Is this unit based on Linux and NTP ?
A/ No the hardware and code running it are completely propriety and don’t use any source code from Linux or NTP. This is done to ensure maximum performance with no overheads and security issues.

Q/ Can I configure it via HTTP/Telnet ?
A/ No. Running a web server on this device although entirely possible would reduce the performance of the unit. Therefore we took the decision to just do configuration via the front panel.

Q/ The performance figures look too good to be true at the price
A/ The performance figures are the result of a focused determination to get the best performance out of the hardware. By not using off the shelf hardware and software we have no overheads or compromises. Try it yourself using Miroslav Lichvar's ntpperf tool. It only starts to drop when the 100Mb interface is maxed out:

nevis@test:~/ntpperf$ sudo ./ntpperf -i enp5s0 -m 70:B3:D5:E3:D0:04 -d -s -B
               |          responses            |     TX timestamp offset (ns)
rate   clients |  lost invalid   basic  xleave |    min    mean     max    rms
1000       100   0.00%   0.00% 100.00%   0.00%
1500       150   0.00%   0.00% 100.00%   0.00%
2250       225   0.00%   0.00% 100.00%   0.00%
3375       337   0.00%   0.00% 100.00%   0.00%
5062       506   0.00%   0.00% 100.00%   0.00%
7593       759   0.00%   0.00% 100.00%   0.00%
11389     1138   0.00%   0.00% 100.00%   0.00%
17083     1708   0.00%   0.00% 100.00%   0.00%
25624     2562   0.00%   0.00% 100.00%   0.00%
38436     3843   0.00%   0.00% 100.00%   0.00%
57654     5765   0.00%   0.00% 100.00%   0.00%
86481     8648   0.00%   0.00% 100.00%   0.00%
129721   12972  15.49%   0.00%  84.51%   0.00% <- 100Mb Interface Saturated
194581   16384  43.65%   0.00%  56.35%   0.00%
291871   16384  62.43%   0.00%  37.57%   0.00%

Q/ Can the unit be firmware updated?
A/ Yes via USB into a Windows PC or Mac. Updates take about 5 seconds to apply.

Q/ Is the BNC output compatible with the Airspy
A/ Yes. Set the BNC output to 10Mhz. Connect the unit to your Airspy via the optional BNC to MCX cable and power the Airspy on.

Q/ Can the unit display my local time ?
A/ Yes. Press the button on the clock screen and use the knob to select your time zone.

Q/ Whats the maximum length of coax to the antenna ?
A/ This depends on the antenna and coax. We've tested our timing antenna (comes with 10 meters of coax) with a 20 meter extension and it works fine. The unit is POE so it may be easier to run a network cable closer to the antenna and install the unit there.

Q/ Does the unit support IPv6
A/ Not currently its in the pipeline and will be availble to all units on release via firmware update.

Q/ What happens on loss of GPS Signal
A/ The unit enters failover mode which uses internal compensation to maintain the accuracy of the timing to 1-4ms typically over 24 hours. After 24 hours with no GPS signal the unit reverts to being a Stratum 16 time source.

Q/ Leap Second Support
A/ The unit has leap second support and a count down timer to the next leap second insertion.

Sample Screen Shots

Main Time Screen
GPS Screen
Status Screen
System Screen

LeoNTP Network Master Clock / Time Server

  • Product Code: HAB-LEONTP
  • Availability: Out Of Stock
  • £300.00

  • Ex Tax: £250.00

Available Options

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Tags: NTP Clock