Phonak TX-300V User Manual page 8

tx-300v studio manual_2006_01_20.qxp 2/1/2006 12:03 PM Page 8
TX-300V Setup Instructions continued
Antenna Installation
Your TX-300V Studio Transmitter Set includes a remote antenna that
features two adjustable-length radials. Extending these radials to the
correct length is extremely important for the system to achieve maximum
transmission range.
Use the following process to determine how long to set your antenna radial
lengths:
1) Determine the average of the highest and lowest frequencies you will
use with this transmitter. (Example: If you are going to use 182.50 MHz
and 186.250 MHz then take the average of 182.50 +186.250 and then
divide by 2=184.375MHz).
2) 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).
3) Extend the two adjustable length radials to the calculated length
(Example: 35.68 centimeters). Screw the two radials to the antenna
mounting assembly.
4) Install the antenna mounting assembly in desired location, preferably
high on a wall, away from any metal objects and with minimal obstuctions
between antenna and location of receivers and orient ground side
downward as indicated on the plastic housing.
5) Connect the RG 58, 50 Ohm coaxial cable to the BNC connectors on
the antenna and on the transmitter.
8