20-520.fm Page 45 Wednesday, August 4, 1999 3:06 PM

When you set up your scanner to track a Type I system, you must choose a size code for each block. When you have chosen a size code for all 8 blocks, you will have

duplicated the fleet map for the system you are tracking. If you have chosen correctly, you will be able to track transmissions in that system.

Each size code defines the number of fleets, subfleets, and IDs each block has. For example, you can see in the following table that a size code of S-4 has one fleet, which is divided into 16 separate subfleets, and it has a total of 512 individual IDs.

Size

Fleets

Subfleets

IDs

Block

 

 

 

 

Used

 

 

 

 

 

 

 

 

S-0

Reserved block for Type II IDs

 

 

 

 

 

 

S-1

128

4

16

1

 

 

 

 

 

S-2

16

8

64

1

 

 

 

 

 

S-3

8

8

128

1

 

 

 

 

 

S-4

1

16

512

1

 

 

 

 

 

S-5

64

4

32

1

 

 

 

 

 

S-6

32

8

32

1

 

 

 

 

 

S-7

32

4

64

1

 

 

 

 

 

S-8

16

4

128

1

 

 

 

 

 

S-9

8

4

256

1

 

 

 

 

 

S-10

4

8

256

1

 

 

 

 

 

S-11

2

16

256

1

 

 

 

 

 

S-12

1

16

1024

2

 

 

 

 

 

S-13

1

16

2048

4

 

 

 

 

 

S-14

1

16

4096

8

 

 

 

 

 

Each ID in the block is unique. The left-most digit is the block number in the ID. The next two digits identify which fleet is active, and the last digit(s) (after the hyphen) identifies the subfleet.

The size codes selected by a Type I system designer de- pend 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

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Radio Shack PRO-90 owner manual Size Fleets Subfleets IDs Block Used
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PRO-90 specifications

The Radio Shack PRO-90 is a compact yet powerful handheld scanner that has garnered attention from both hobbyists and serious enthusiasts of radio communications. Introduced as a versatile scanner, the PRO-90 is designed for ease of use while providing a myriad of features that enhance the scanning experience.

One of the key characteristics of the PRO-90 is its advanced scanning technology. The unit boasts a 100-channel memory, allowing users to store and quickly access frequently used frequencies. The scanner supports a wide range of frequency bands, making it suitable for monitoring everything from police and fire frequencies to aviation and marine channels. With programmable scanning capabilities, users can effortlessly create their own scanning routines tailored to their interests.

The PRO-90 also features a fast scanning rate, with the ability to scan across frequencies at remarkable speeds. This minimizes the wait time for users who want to listen to different bands or channels, ensuring they never miss critical transmissions. Additionally, the scanner includes a dedicated "Hold" function that allows users to temporarily pause on a specific frequency for extended listening.

In terms of ease of use, the PRO-90 is designed with an intuitive interface. The scanner includes a backlit LCD display, making it easy to read in low-light environments. The keypad is arranged logically, enabling quick access to functions such as volume, squelch, and memory management. Users can also program the scanner via PC, thanks to its compatibility with programming software, making it easier to manage and transfer frequency lists.

Another standout feature of the PRO-90 is its ability to decode various digital signals. This includes some types of Motorola, GE, and other digital technologies, which are commonly used in modern communications. This capability extends its usefulness beyond traditional analog signals, making the scanner relevant in today’s digital landscape.

Moreover, the Radio Shack PRO-90 is designed with portability in mind. Its compact size and lightweight construction make it an ideal companion for outdoor activities, road trips, or simply enjoying the local communications landscape. Whether you’re a seasoned radio enthusiast or a newcomer to the field, the PRO-90 provides a rich set of features, advanced technology, and user-oriented design that enhance the scanning experience. It stands out as a worthy tool for anyone looking to immerse themselves in the world of radio communication.
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