NTP100 – Rev 2.2.0 Oct-12
3
© Masterclock
®
, Inc.
Installation
Operating Environment
The NTP100 is not water or moisture proof and is designed for indoor use only. Treat it as you would any other
delicate electronic device and do not expose it to water, excessive heat or physical abuse. Please see the
“Specifications” section.
GPS Antenna and Cable (model NTP100-GPS, NTP100-GPS-HS only)
The NTP100-GPS or NTP100-GPS-HS requires a pre-amplified antenna. It provides +5 VDC via the center pin of the
coaxial cable/connector for remote power to the antenna.
[WARNING: Attaching a passive (non pre-amplified) antenna to the NTP100 could destroy the GPS receiver module.
This is a major repair cost which is not covered by warranty.]
The unit is tested and shipped with the appropriate cable for the antenna that was ordered. Should you require a longer
antenna cable we recommend that you contact MC so that a properly matched cable and antenna can be supplied.
Although changing the GPS antenna or coaxial cable is not technically difficult, you are on your own should you decide to
make such changes. We do not warrant or support operation with any hardware not installed or supplied by us.
The coaxial cable should not be crushed, crimped or bent at a sharp angle nor should it be strained by pulling. Any damage
to the cable could result in the NTP100-GPS not functioning properly. If the cable is to be coiled for storage, the coil
diameter should be at least 6”.
Antenna Location
Depending on the type of building where the NTP100-GPS is located and obstructions that may block reception of signals
from the GPS satellites, the antenna may have to be located where it has an unobstructed view of the sky. In some cases this
can be accomplished by placing the antenna adjacent to a window. However, in most cases it will require mounting the
antenna outside of the building or on a roof. In the worse case, the basic requirement for assured system operation is that the
antenna has a clear and unobstructed view of the sky for initial satellite acquisition and lock. It is possible that the system
will operate indoors and under other obstructions however this can only be determined empirically; it is not guaranteed.
If a longer cable is required, cables of various lengths (up to 500 feet) with pre-amplified antennas are available from
Masterclock, Inc.
[Note: bringing the NTP100-GPS or NTP100-GPS-HS up for the first time with an indoor antenna may prevent or
significantly increase the time to first fix.]
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