Bird Technologies 73-67-25 Series - Manual (Page 10)

TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 4
The TX combiners can be expanded one channel
at a time with factory-tuned, easy-to-install expan-
sion channel assemblies. Expansion is usually
accomplished without modifications to the existing
system, and usually amounts to nothing more than
placing a new channel assembly, or several, on top
of the existing system. New channel frequencies
can be above, below, or between existing channel
frequencies.
The number of channels in the combiner is indi-
cated by the last two digits of the model number in
place of the NN designation. All of the information
for both installation and expansion is included in
this manual. The combiner is easy to install and
has been factory tuned in most cases so that no
adjustments are necessary. The specifications for
the 73-67-11/25-XX-NN family of T-Pass combin-
ers are listed in Tables 1 and 2 for the 6.625” and
10” cavities respectively. The curves shown in Fig-
ures 2 and 3 show the typical transmit noise sup-
pression for the 6.625” and 10” cavity systems
respectively. Noise suppression depends on the
cavity’s loss setting. Figure 4 shows a typical Peg
rack model and Figure 5 shows a typical 19” rack
mount model.
UNPACKING
It is important to visually inspect the system com-
ponents for any shipping damages as soon as pos-
sible after taking deliver y. It is the customers
responsibility to file any necessary damage claims
with the carrier.
Figure 4: Example of typical Peg-rack model
using 10” cavities.
Figure 5: Example of typical Relay-rack model
using 10” cavities.