Ensemble Designs 9400 3G Test Signal and Sync Pulse Generator - Manual (Page 21)

www.ensembledesigns.com Avenue 7400 and 9400 - Page 21
Model 7400 HD/SD and Model 9400 3G/HD/SD Sync Pulse Generator and Test Signal Generator
Installing the GPS Antenna
The included GPS antenna is compact, weatherproof, and has internal high-gain pre-amplification.
It mounts onto standard 3/4” threaded pipe, metal or plastic. Connection from the F-style coaxial
fitting on the antenna to the appropriate BNC on the Avenue Frame can be made with customer
supplied standard 75 ohm cable. The coax cable can be routed through the center of the pipe for a
completely waterproof installation. When low loss cable such as Belden 1694A is used, the antenna
can be placed up to 200 feet (60 meters) from the frame. Ideally, the antenna is mounted outdoors
where it has an unobstructed view of the sky.
Even if you do not connect the GPS Antenna to the 7400-GPS module, it will nevertheless provide
greater accuracy than the module’s internal TCXO (Temperature Compensated Crystal Oscillator).
Safety and Outdoor Antenna Grounding
When installing the antenna for the 7400-GPS option, please be aware of safety precautions with
respect to outdoor antenna grounding. Please read the following excerpt from the National
Electric Code and refer to the below illustration.
“If an outside antenna or cable system is connected to the product, be sure the
antenna or cable system is grounded so as to provide some protection against
voltage surges and built-up static charges. Article 810 of the National Electrical
Code, ANSI/NFPA 70, provides information with regard to proper grounding of
the mast and supporting structure, grounding of the lead-in wire to an antenna
discharge unit, size of grounding conductors, location of antenna-discharge
unit, connection to grounding electrodes, and requirements for the grounding
electrode.”