900MHz TC-916 Rev-E 04-2007
3
TIPS & TROUBLE SHOOTING
Things that block transmission
Things that block transmission
are not always obvious. Consider any obstruction that may get in the way or reduce the wireless
signal strength along the way. Here are some of the most common pitfalls:
•
Transmitting through walls in an office environment may be limited if the transmitting path has many desks,
computers and other office type equipment in it’s path. Raise the transmitter and receiver above desks and
equipment to minimize obstructions.
•
Steel, or anything with steel in it---steel-reinforced concrete (rebar) or metal window screens, or a tool-room cage.
Aluminum siding, and energy-saving foil on the insulation in the walls are sneaky killers for radio waves. Some
metallic paints or metallic wallpapers also block signals.
•
Mirrors block transmission, because the “mirror” consists of a metallic backing on the glass.
•
Lead windows will kill radio transmission; also windows that are UV coated may have thin metal energy-saving
film.
•
Other materials like brick, drywall or wood, will also cut down on the signal, depending on water content.
Snow on the Monitor
If there is snow or noise on your monitor, it is a good indication that the receiver is not receiving enough RF signal to process
the video. To correct an image that has a lot of noise (snow) :
•
Move the transmitter and receiver closer together.
•
Eliminate obstructions between the transmitter and receiver.
•
Add a high gain antenna to the receiver end to increase receive sensitivity.
•
Use a higher output power transmitter.
Interference
We strongly recommend that you always conduct a temporary setup of any wireless equipment before systems are permanently
mounted. As we are sharing a radio frequency that are considered part of the public band, we do not have any entitlement to
that frequency and must accept interference if it exists.
Examples of RF Interference
•
Other 900MHz video transmitters in your area.
•
900MHz wireless data network.
•
Proximity to some consumer products may be a source of interference. Examples include cordless phones,
consumer data transceivers for wireless Internet.
Other Examples of Interference Not Related to Wireless
•
Improper line-of-sight, installation or alignment of transmitters and receivers.
•
Power source ground loops.
•
Incorrect voltages to devices (too high or too low), including transmitters and receivers.
•
Sharing power supplies between devices.
•
Power source is too close to video cable, low impedance, coax cable kinks, poor video cable terminations,
improper and/or lengthy power source cabling.
•
Corresponding transmitter and receiver sets are on different channels.
