centralize their communications and control the type of users on a single system. Determining the exact fleet- subfleet hierarchy for a particular area is referred to as fleet map programming.

The disadvantage of a Type I system is that the brief burst of data sent when a user transmits must contain the radio’s ID, its fleet information, and the subfleet infor- mation as well. This is three times the amount of data a Type II system radio sends. Since the data capacity of Type I systems is limited and the total amount of data in- creases with each user, Type I systems usually accom- modate fewer users than Type II systems. Nevertheless, Type I systems are still in use.

There are also hybrid systems which are a combination of Type I and Type II. Your scanner is preset to monitor Type II systems, but you can change to Type I or a hy- brid of Type I and Type II systems by selecting a prepro- grammed fleet map or creating a custom fleet map for your area (see “Scanning Type I and Hybrid Trunked Systems” on Page 51).

SETTING THE SCANNER TO THE TRUNKING MODE

Simultaneous Trunking

The scanner allows you to track up to 10 systems at a time. You can trunk scan or search and scan conven- tional frequencies at the same time. You can also pro- gram conventional frequencies in the same bank as trunking systems.

After the scanner is finished checking activity in the trunked system, it scans other conventional frequencies in the bank. (Only trunking frequencies are programmed in trunk mode.)

If a system is inactive for 1 second and there are no con- ventional channels in the bank, the scanner starts scan- ning the next selected trunk bank. If you turned DELAY on, the scanner starts scanning the next trunk bank after about 5 seconds.

Trunking Operation

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Radio Shack PRO-94 owner manual Setting the Scanner to the Trunking Mode, Simultaneous Trunking
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PRO-94 specifications

The Radio Shack PRO-94 is a versatile and feature-rich handheld scanner that has garnered attention from both amateur radio enthusiasts and professional users alike. Renowned for its accessibility and performance, the PRO-94 serves as an ideal device for those looking to stay connected with various radio frequencies.

One of the main features of the PRO-94 is its ability to receive a wide range of frequencies. The scanner covers VHF low and high bands, UHF, and even the 800 MHz frequency range, allowing users to pick up signals from local police, fire departments, amateur radio operators, and more. This broad frequency range ensures that users can monitor diverse communications and stay informed about local events.

The scanner is equipped with an advanced trunk-tracking technology that allows it to follow trunked radio systems. This is particularly useful for monitoring state and local emergency services, as many of these organizations have migrated to trunked systems to maximize channel efficiency. The PRO-94 simplifies this process by automatically scanning through the trunked frequencies, making it easy for users to catch important dispatches without manual adjustments.

Another standout characteristic of the PRO-94 is its 200 memory channels. Users can program these channels to store specific frequencies, making quick access seamless. The scanner also supports multiple banks, allowing for organized grouping of channels, which is advantageous for users who monitor different types of services or agencies.

With its user-friendly interface, the PRO-94 includes an LCD display that shows relevant information, such as the frequency being received or the bank and channel currently in use. The keypad is designed for efficient navigation, making it straightforward to enter frequency modes and access programmed channels easily. Additionally, the scanner features priority channels, which allow users to monitor certain frequencies continuously, ensuring they do not miss critical communications.

The PRO-94 runs on AA batteries, providing convenience in terms of power supply. Its compact size and lightweight design ensure portability, enabling users to take it on the go, whether on a hiking trip or during community events.

In summary, the Radio Shack PRO-94 stands out as a robust and user-friendly handheld scanner. Its diverse frequency reception, trunk-tracking technology, extensive memory capabilities, and portable design make it a compelling choice for anyone keen on monitoring radio communications.
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