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LapRF Event Timing System
Preliminary Operator's Manual
Rev 0.99 - May 2017
Specifications
5.8GHz RF Detection
Frequency
5.3-6.0GHz
Programmable Attenuation
0-32dB
Antenna
Custom linearly polarized (Suitable for LHCP, RHCP, Linear use)
Channels
Arbitrary (defined by connected app.)
Pilots
1-16, depending upon required precision and gate speed
Mechanical
Dimensions
L =220mm, W = 160mm, H =30mm
Weight
1.1kg
Cooling
Passive, no moving parts
Power
External
9V - 17V (3s/4s LiPo ideal for field use)
Consumption
~10W
Interface
Ethernet
Waterproof RJ45 connection
USB
Optional internal USB connection
App Support
Platforms
Windows, LiveTime scoring engine
2
Introduction
The LapRF 8-Way Event Timing Edition is the first in a family of race timing systems from
ImmersionRC.
LapRF technology uses the emitted 5.8GHz RF from race quadcopters (or fixed wing aircraft) to
detect a passage through the start-finish gate.
Different from other offerings on the market, the LapRF uses custom timing receivers with specially
designed antennas to ensure that only quads which pass through the ‘beam’ are timed, and other
sources of interference are ignored.
All that is required to use the LapRF in a race is to program the band, and channel that each pilot will
use, place the timer in the start/finish gate, and go fly! No transponders required.
Base Manual
The LapRF 8-Way shares many features with the LapRF Personal Edition, and therefore the manual
for the Personal Edition forms the base of the 8-way manual.
This manual covers the additional features for the 8-way.
LapRF Personal Edition Manual
3
Getting Started
The 8-way has been designed to be used by anyone interested in timing an FPV racing event, without
special skills.
1) Apply power, and install in the start/finish gate.
2) Hook up the Ethernet cable to either a network, or a direct connection to the timing PC
3) Set an appropriate IP address using the built-in OLED display.
a) If used on a network, reserve a static address for the LapRF
b) If a direct connection is used, set an address compatible with the static IP address of
the timing PC.
e.g. If the timer is on 192.168.1.9, place the PC on 192.168.1.1
4) Ping the LapRF using the Windows command line to ensure that it is reachable
ping 192.168.1.9
5) Start up Livetime FPV on the windows PC, and follow the Livetime instruction manual for how
to setup the LapRF.
For an overview of the gain and threshold settings, please refer to the LapRF Personal Edition
manual. For 25mW races, values of 59 and 800 respectively are generally suitable, and don’t need
tweaking during the event.
4
Heat, the #1 enemy of electronics
FPV races are a lot more pleasant when the snow has melted, and the days are long enough for more
packs than your charger can keep up with.
These spring and summer months closer to the equator brings the sun, and the potential damage
that it can cause to electronics used for FPV racing.
The LapRF Event System uses a milled, anodized, waterproof housing, which keeps electronics
protected from dust, and moisture, which appears to be attracted to FPV events (especially those
held on the Spanish isle of Ibiza).
This housing also acts as a heatsink to keep the sensitive timing receivers cool, and ensuring that
they have a long working life.
When placed in direct sunshine, at elevated temperatures, the effectiveness of this heatsink is
reduced, so care does need to be taken.
Simply protect the LapRF from direct sunlight, using anything that is transparent to RF. A piece of
white fabric, a pizza-box lid (ideally with tomato sauce removed), even the cardboard box that the
product ships in.
Placement
The lapRF’s integrated patch antennas form a beam which emits from the top of the product.
Ideal placement is in the center of the gate, but that does expose it to strikes from low-flying (high
speed) racers.
A small hole in the ground works well to protect it for grass tracks, or where this is not possible,
either protect the timer from strikes placing a solid object in front of it, or place the timer at a 45
degree angle from one corner of the gate.
When laying out tracks for RF timing, avoid parts of the track which come close to the timing gate to
prevent false readings.
For start grid positioning, place it at least 5m from the gate to ensure that the first crossing is
registered.
5
Limitations
In general, you will find the LapRF to be truly best-in-class when it comes to RSSI timing systems.
The custom timing modules, coupled with a significant amount of processing power on-board, and
some highly refined curve-fitting algorithms , help to run races without an engineer present.
The one limitation that we will be very honest about is running the system in indoor environments
which are in the ‘RF Hell’ category.
Buildings with huge amounts of metal, roofs, walls, etc. are not only unsuitable for analog FPV racing,
they are a real challenge for RF lap timing also, and are best avoided.
6
5


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