CHANNEL ACTIVITY INDICATORS

Your scanner has 20 channel activity indicators (bars) which show the activity taking place on a trunked sys- tem. You can see how many frequencies are being used and generally monitor how much communication traffic is occurring.

Each frequency you store in a trunking bank has a corre- sponding activity indicator. However, since there are only 20 indicators, but you can store up to 30 frequen- cies, some indicators might indicate more than one fre- quency if the trunked system you are scanning has more than 20 channels.

•The indicator that remains on steadily even when there are no current transmissions represents the frequency being used as the data channel.

•The indicator that flashes when an ID appears rep- resents the frequency being used by the radio you are currently hearing.

•If an indicator turns on but you do not hear a conver- sation, the channel is probably being used for a tele- phone interconnect call or a private call, or the indicator might be a locked-out ID. Your scanner does not monitor these types of calls.

•If the scanner is holding on an ID which is not active, the other activity indicators turn on and off as other groups use the system.

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Radio Shack PRO-90 owner manual Channel Activity Indicators
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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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