20-432.fm Page 30 Friday, July 14, 2000 11:30 AM

TRUNK SCANNING

Your scanner is designed to track transmissions on Motorola Type I, Type II, GE/Ericsson EDACS, and hy- brid analog trunking systems. Re- member these important points when tracking transmissions:

•Your scanner monitors Type II systems by default. However, you can change this if the system in your area is different (see “Types of Trunking Systems” on this page and “Scanning Type I and Hybrid Trunked Systems” on Page 40 for more information).

•Your scanner tracks a trunked system or scans frequencies in conventional mode, but it cannot do both at the same time.

•The frequencies for many of the 800 MHz public safety systems are listed in the separate “National Public Safety Trunked System Frequency & Talk Group Guide” included with this scanner.

TYPES OF TRUNKING SYSTEMS

Your trunk scanning scanner can monitor three basic types of systems

—Type I, Type II, and EDACS. In- stead of selecting a specific frequency to transmit on, a trunked system chooses one of several frequencies in a 2-way radio user’s talk group when that user presses PTT (push to talk). Thus, trunking systems allocate a few frequencies among many different us- ers, but the way Type I and Type II systems do this is slightly different.

One important distinction between these systems is the amount of data transmitted by each radio when its PTT button is pressed. In a Type I system, the radio’s talk group ID and its current affiliation (the trunk system it belongs to) are both transmitted. In a Type II system, only the radio’s talk group ID is transmitted.

Why the difference? In Type I sys- tems, each radio in the trunk group in- dividually transmits its own affiliation, while the trunk system maintains a da- tabase that determines each radio's affiliation(s) in Type II systems.

Another difference between the sys- tems is that Type I systems are ar- ranged in a fleet-subfleet hierarchy. For example, it is possible for a city using a Type I system to designate four fleets, each with eight subfleets.

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Radio Shack PRO-2052 owner manual Trunk Scanning, Types of Trunking Systems
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PRO-2052 specifications

The Radio Shack PRO-2052 is a versatile and feature-rich scanner that has captured the attention of amateur radio enthusiasts and professionals alike. This desktop scanner is designed to receive a wide array of frequencies across various bands, making it a valuable tool for monitoring communications.

One of the standout features of the PRO-2052 is its ability to monitor VHF, UHF, and some trunked radio systems. It boasts a wide frequency coverage range from 25 MHz to 1.3 GHz, covering conventional FM, AM, and even the digital communications that have become increasingly popular. This extensive coverage ensures that users can receive a plethora of broadcasts, from local police and fire departments to amateur radio operators and public service communications.

Another significant feature is the scanner's memory capacity, which allows users to store up to 300 channels. This capability is particularly beneficial for those who frequently listen to multiple frequencies, as it provides the flexibility to switch between channels seamlessly. The scanner also supports the ability to organize channels into banks, making it even easier to manage multiple frequencies.

The PRO-2052 comes equipped with a variety of scanning modes, including Narrowband and Wideband scanning, which cater to different listening preferences and needs. Users can employ the Delay function that pauses scanning for a brief period after a transmission is detected, ensuring that they don’t miss any important information. Furthermore, the Priority Scan feature enables monitoring of a selected channel while still continuously scanning other frequencies, adding another layer of functionality.

In terms of usability, the PRO-2052 is designed with a clear and intuitive interface, featuring a backlit LCD that makes it easy to read in various lighting conditions. Its control panel is user-friendly with dedicated keys for commonly used functions, allowing both beginners and seasoned professionals to operate the device with ease.

Furthermore, the scanner has built-in weather alert capabilities, offering users prompt notifications about severe weather conditions, ensuring safety and preparedness. The PRO-2052 is powered either by an AC adapter or batteries, providing the flexibility to operate in various environments.

In summary, the Radio Shack PRO-2052 is a powerful and user-friendly scanner that offers a rich set of features, making it a top choice for those interested in radio communications. Its extensive frequency range, substantial memory capacity, and multiple scanning modes make it suitable for a wide variety of applications, proving to be a reliable companion for enthusiasts and professional users alike.
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