NTS 01 Rev 1 – User Manual March 2006
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Page 5 of 31
Tekron International Ltd
PO Box 31 285 Lower Hutt 6009 New Zealand
tel:
+64 4 566 7722
fax:
+64 4 569 9272
email:
3
Specifications & Connections
3.1
Plugs – Inputs & Outputs
All connections to the NTS01 are made via the rear panel.
Fig 2. Rear Panel – NTS 01 base unit
P1/P2
Power is applied to the unit via either or both of these plugs. Maximum power
consumption is 6 watts. Despite the markings on P1 and P2, the polarity of the power connection
is
not
important and the unit is fully isolated internally from the power source. Mating
connectors are supplied with the unit, suitable for wiring sized up to 1.5mm
2
. The provision of
two power inputs allows the NTS01 to be used in environments operating with redundant power
supplies. NTS01 has several power supply options covering the range of 12Vdc through
300Vdc/230Vac. All options include surge protection. (See
Section 7.2
p25 for full details on
power supply options)
Check the option label on the unit base for power supply voltage ratings!!
Ant
The antenna input, (SMA jack located above P1) provides an interface for an external
active antenna via low-
loss coaxial cable of 50Ω impedance. 3V DC is supplied (Imax=100mA)
to power the high-gain active GPS antenna supplied with the NTS01 kit.
Care should be taken to ensure that the connector is not cross-threaded when attaching the
antenna lead-in cable.
The total combined gain of the antenna system (antenna plus cable and connectors) should fall in
the range of 10 to 35 dB, the optimum being 22dB. The antenna and 30M cable supplied with
the kit provides a near-optimum combination, but if necessary, the lead-in cable can be reduced
to 15m or extended to 60m using the same type of cable without the need for any additional
amplification. For lead-in lengths longer than 60m, either amplification and/or larger diameter,
lower loss cable can be supplied to order.
A Lightning Protection device may be inserted into the antenna lead. A suitable device complete
with additional cable connectors, a connector crimping tool and mounting hardware is available
as an option (see
section 7.4
p25). Introduction of the Lightning protector does not degrade the
performance of the antenna system.
