The size codes selected by a Type I system designer depend on the specific needs of the system's users. Some organizations might want many subfleets with only a few radios each, while another organization might want only a few subfleets, with many radios each. To scan Type I systems, you must select or program a fleet map with the same size code assignments as the trunked system. If you do this accurately, you will track all the fleet and subfleet combinations used by the sys- tem. In other words, you will hear complete communi- cations while monitoring a trunked system.
Note: Preset fleet maps might be available at www.trunkscanner.com.
If you do not already know the size codes used, you will have to guess them. But since you do not have to figure out all the blocks at once, this is not as hard as it seems. Select a size code for a block, then press SRC. Now listen to the communications. If you decide you are receiving most of the replies to the conversations with IDs assigned to the block you just programmed, then you have probably selected the right size code and can work on the next block of the map.
There are 16 preset fleet maps to choose from, and it is best to start with these when setting up a Type I or hy- brid trunk tracking bank. If none of the following preset fleet maps allow you to follow complete conversations, then you probably need to program your own fleet map (see “Programming a Fleet Map” on Page 51).
| E1P1 |
| E1P2 |
| E1P3 | |||
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| Size |
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| Size |
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| Size |
Block |
| Code | Block |
| Code | Block |
| Code |
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0 |
| S11 | 0 |
| S4 | 0 |
| S4 |
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1 |
| S11 | 1 |
| S4 | 1 |
| S4 |
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2 |
| S11 | 2 |
| S4 | 2 |
| S4 |
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3 |
| S11 | 3 |
| S4 | 3 |
| S4 |
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4 |
| S11 | 4 |
| S4 | 4 |
| S4 |
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5 |
| S11 | 5 |
| S4 | 5 |
| S4 |
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6 |
| S11 | 6 |
| S4 | 6 |
| S12 |
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7 |
| S11 | 7 |
| S4 | 7 |
| (S12) |
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53