Physical Protection; Adjacent Signals; Antenna Power; Connection To Antenna - Arbiter Systems 1205B Operation Manual

3.4.2 Physical Protection

Consider common causes of physical damage when routing the antenna cable: closing doors,
falling objects, foot traffic, heat and vibration. The cable is not intended for hanging in midair.
Allow a sufficient bend radius to prevent kinks. Allow extra length to prevent tension on the
connectors and a service loop, if a connector needs replacement.
Always leave a drip loop wherever the cable enters a structure to prevent water from entering via
the cable jacket.

3.4.3 Adjacent Signals

The standard RG-6 cable is triple-shielded, with good shielding properties. However, the
quad-shielded RG-11 cable provided even more isolation and may be a better choice if the cable is
routed near high power RF sources or alongside transmitter cables.

3.4.4 Antenna Power

The RF preamplifier within the antenna requires 3.3 Vdc to 5 Vdc at approximately 30 mA nominal
for operation. The GNSS receiver supplies this power through the coaxial antenna cable. Avoid
shorting the center conductor to the shield of the coaxial cable as it may damage the preamplifier.
Either a short circuit or open circuit condition in the antenna cable will render the clock unable to
receive satellite signals.
Prior to initial operation or if problems exist, review the tests described in Section 3.2.

3.4.5 Connection to Antenna

The male Type F connector on one end of the antenna cable mates with the female Type F
connector on the antenna. Avoid placing mechanical stress on the cable attachment to the
antenna.

3.4.6 Connection to Clock

The male Type F connector on the opposite end of the antenna cable connects to the female Type
F connector on the rear panel of the clock.

3.4.7 User-Supplied Antenna Cables

Any RF cable meeting the requirements described above for signal loss and DC resistance may be
used. Signal loss must be < 21 dB at 1575.42 MHz, and the cable DC resistance should not drop
the supply voltage to the antenna below 3.3 Vdc. However, prior to using a non-standard antenna
cable, verify proper installation by reviewing Section 3.2
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