TransCore encompass 4 - Frequency Plan; Figure 2 Frequency Separation for Four Lanes; Table 5 Reader Frequencies Staggered for 14 Lanes

Quick Start Guide
TransCore Proprietary 10
Frequency Plan
The Encompass 4 Reader FCC-approved frequency band is 911.75 to 919.75 MHz. This relatively narrow
frequency band requires careful planning to maintain the desired 2 MHz frequency separation between
adjacent readers.
If readers are spread out within a facility (readers ½ mile or so apart) and loops are used, then frequencies
may be reused. Figure 2 shows frequency separation for 4 lanes.
Table 5 shows an example of the frequency settings for up to 14 lanes, along with the two dierent
commands that can be used to set the reader operating frequency. Command #642NN is backward
compatible to older readers including the Encompass 2 reader, and provides a 0.5MHz resolution.
Command #647XXX provides a 0.25MHz resolution for setting the reader frequency. Either command may
be used to set the reader frequency. Note that the response to Command #527 (Display RF Parameters)
will include either two or three hexadecimal characters, depending on which command was last used to set
the reader frequency.
Table 5 Reader Frequencies Staggered for 14 Lanes
Lane
Reader
Frequency
#642 #647 Lane
Reader
Frequency
#642 #647
1 912.50 15 0D2 2 915.00 1A 0DC
3 917.50 1F 0E6 4 913.50 17 0D6
5 916.00 1C 0E0 6 918.50 21 0EA
7 914.50 19 0DA 8 917.00 1E 0E4
9 913.00 16 0D4 10 915.50 1B 0DE
11 918.00 20 0E8 12 914.00 18 0D8
13 916.50 1D 0E2 14 919.00 22 0EC
Figure 2 Frequency Separation for Four Lanes