Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual
Page 30 of 103
Attenuation
Attenuation depends upon the cable length, and the loss per unit length. The total attenuation must be
limited to 30 dB (maximum) at the GPS L1 frequency of 1575.42 MHz
DC Resistance
The cross-sectional area and length of the conductors in the cable determine the dc resistance. Since
power to the RF preamplifier in the antenna is supplied via the antenna cable, excessive dc resistance
will degrade performance. Because of the above factors, changes to the length and/or type of antenna
cable should be made carefully. Damaged cables may also affect performance.
Available Antenna Cables and Accessories for Longer Runs
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offers longer antenna cables for use with all models of clocks when the standard 15 meters
(50-foot) cable is inadequate. RG-6 cable runs up to 50 meter, RG-8 cable is available for 100 meters
(328 foot) without the in-line preamplifier.
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offers in-line amplifier, (P/N: m-LA-01) for long
antenna cable requirement up to 200 meters (656 foot).
Description
Delay, ns
Signal Level, dB
15-m (50-ft) cable, RG-6
60 ns
5dB
30-m (100-ft) cable, RG-6
120 ns
9dB
50-m (164-ft) cable, RG-6
200 ns
15dB
100-m (328-ft) cable, RG-8
393 ns
17dB
Table 6.1: Antenna Mounting
Connection to Antenna
The male Type N connector on one end of the antenna cable mates with the female Type N connector on
the antenna.
Connection to GPS Master Clock
The male Type BNC connector on the opposite end of the antenna cable connects to the female Type
BNC connector on the rear panel of the GPS Clock.
6.2 Unit Installation
After GPS Antenna installation is complete, GPS Master Clock Model MC-1-M unit can be installed as per
below procedures.
1. It is necessary to provide correct power supply to unit as per specified order or as per power supply
specification mentioned at the unit’s rear panel.
2. Ensure that the power supply polarity connections are done as per mentioned Label on specific
power supply connector terminal on rear panel.
3. It is recommended to not connect the NTP outputs in installation site ethernet network till proper
network settings are done in unit.
