Transcript
How to Optimize the TX300-V
B. Antenna Orientation
Antenna
i. The antenna’s pattern is hemispherical, meaning that it has an “active” side and a
Introduction
ground side. The active side directs the signal The Goal of this memo is to present ideas how to
toward the receivers, so it is essential that the
better optimize the use of the TX300-V. It will
active side be oriented toward the area where
document certain procedures that help users of the
the receivers will be used the Antenna
TX300-V set the system up properly.
Module’s ground side has the word “GROUND” molded into the plastic
Antenna Installation
ii. See Diagram A. If it is necessary to locate an antenna low on a wall, the ground side should face down. If you are mounting a monopole
Antenna Installation
antenna in a ceiling or high on a wall, the A. Selecting an Antenna Location
ground side should face UP. It may be necessary to move the ground side of the
i. The location and configuration of your
antenna mount around in order to accomplish
antenna mount will determine the quality of
this.
your signal; therefore, there are some important factors to consider. ii. Where will the receivers be located? Ideally, the antenna will be centrally positioned above that area. iii.
Where will the transmitter or stationary
i.
To move the ground side of the module, simply remove the four nuts, reverse the module so that the ground side is facing the bracket, then re-attach the nuts. Be careful to not detach any wires if the module opens while it is not secured to the bracket.
receiver/power amplifier be located? We recommend that it be located no more than 25 feet (7.6 meters) from the antenna. iv. Are there any metal obstructions in the area? Ideally, there will be no metal between the antenna and the receivers. Also, try to avoid mounting the antenna in a location where nearby metal would be in parallel with the antenna -- this degrades the signal. v. Will the antenna be mounted outdoors? Antennas work well outdoors, but if possible, try to place the antenna where it will not receive too much exposure to moisture or dirt. Covering exposed connections with petroleum jelly or silicone gel will extend the life of the antenna.
www.phonak-communications.com
1
C. Mounting to the wall
use 182.50 MHz and 186.250 MHz then take the average of 182.50 +186.250 and
i.
We recommend using appropriate wall anchors to mount the Mounting Bracket directly to the wall.
then divide by 2=184.375MHz). ii. Divide 7500 by the average frequency (in MHz), then subtract 5 from this result. The solution to this equation is the length in centimeters to set your radials to. (Example: 7500/184.375=40.68. 40.68-5= 35.68cm radial length). iii. Extend the two adjustable length radials to the calculated length (Example: 40.68 centimeters). Screw the two radials to the antenna mounting assembly. iv. Install the antenna mounting assembly in desired location, preferably high on a wall, away from any metal objects and with minimal obstructions between antenna and location of receivers and orient ground side
D. Mounting to a wall box i. The antenna may also be mounted to a
downward as indicated on the plastic housing.
single or dual gang duplex box, or to a square or hexagonal junction box.
Connecting the Cable 1. Positioning of the coaxial cable a. The coaxial cable should always run down the near the ground radial. If the antenna is inverted, the principle remains the same. Running the cable near the active radial will cause interference and diminish the range. b. Connect the RG 58, 50 Ohm coaxial cable to the BNC connectors on the antenna and on the transmitter.
2. Connecting the BNC connectors a. The BNC is connected by matching up the pegs on the male connector with the slots on E. Determine the correct length of the antenna i. Determine the average of the highest and lowest frequencies you will use with this transmitter. (Example: If you are going to
www.phonak-communications.com
the female end. b. Once the two ends have been matched, push down on the male connector to swivel the connector until it locks the female.
2
Strategies and Troubleshooting
58, is too large and a degradation of the signal
1. RF Reception Maximization Strategies (from
power will occur.
TX300-V Manual) b. a.
For proper and dependable operation, Phonak
It is encouraged to use RG-8 at lengths greater than 15m.
receivers need to receive a strong and consistent signal from the originating
3. Troubleshooting Questions and Answers
transmitter. The following strategies should be used to maximize this signal:
a.
i. When designing and installing your system,
There is very limited range between the transmitter and receiver
keep in mind that the location of the transmitting antenna is critical to maximize
i.
The first thing that needs to be checked is the length of the antenna radials. Review the
broadcast range.
information above to be sure that the lengths ii. Eliminate or minimize obstructions between
are correct in correlation with the desired
the transmitter and receiver(s).
transmitting frequency.
iii. Minimize the distance between the transmitter and receiver(s).
ii. Make sure the antenna has been placed in an area free of metal obstructions.
iii.
Move the transmitting antenna away from metal or conductive objects.
iii.
Check the operating power of your transmitter there are three settings, ¼, ½ and full power.
iv. Place the transmitting antenna as high as
Increase the power if it’s low.
possible. a.
I cannot hear anything from my receiver
v. Orient the transmitting antenna vertically. vii. Position the RF Power switch on the back
i. Make sure the receiver’s batteries aren’t dead, that it is turned on, set to the right
of the TX300-V to full RF Power, unless lower
channel, and the volume has been turned
power is necessary.
up. vi. Extend radials to the correct length for selected frequencies.
ii. Make sure your transmitter or stationary receiver has been powered up and set to the
2. Cable
right channel, and the desired audio has been applied.
a. The TX-300V and antenna require the use of 50 Ohm cable. There are two cable types with this
iii.
Make sure the coaxial cable has been tightly
resistance – RG-8 and RG-58 (RG-58 is supplied
attached to both the antenna and the
with the TX300-V kit)
transmitter/ stationary receiver.
Using the antenna cable supplied with the unit is sufficient unless this cable distance is greater than
iv. Make sure you have used 50 ohm coaxial cable.
15m. Because of the amount of attenuation, the RF power loss, at lengths greater the 15m with RG-
www.phonak-communications.com
v. Make sure the antenna element(s) has been securely attached to the Antenna Module.
3
