Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
2-6
2.5.2 Cable
Lengths
The maximum recommended antenna cable length when installed without a preamplifier is 300
feet of LMR 400 or equivalent cable with a maximum attenuation (loss) of 16 dB (Figure 2-1).
When selecting alternate antenna cable sources, the attenuation characteristics at the GPS
frequency of 1575.42 MHz must be known. To ensure optimum receiver performance, the total
antenna cable attenuation must not exceed 16 dB regardless of cable length. Cable attenuation
of greater than 16 dB requires the use of a Model 8227 Inline Amplifier (Figure 2-2).
Figure 2-1: Cabling without Inline Amplifier
Model 8225
Install the impulse
suppressor between
the antenna and the
NetClock.
Model
8226
NetClock
300’ of LMR 400 or Equivalent, Maximum
16 dB Attenuation, Maximum
Содержание 9289
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