Channel Activity Bars

20-521.fm Page 47 Wednesday, August 4, 1999 3:32 PM

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 cor- responding activity bar. However, since there are only 20 bars, but you can store up to 30 frequencies, some bars might indicate more than one frequency if the trunked system you are scanning has more than 20 channels.

•The bar that remains on steadily even when there are no current transmissions represents the fre- quency being used as the data channel.

•The bar that flashes when an ID appears repre- sents the frequency being used by the radio to transmit what you are currently hearing.

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

BANK2

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

PRO-91 specifications

The Radio Shack PRO-91 is a handheld scanner that appeals to both amateur radio enthusiasts and professionals seeking a reliable and versatile communication device. Known for its user-friendly design and wide range of features, the PRO-91 is an excellent choice for monitoring various frequencies, including VHF and UHF bands.

One of the standout features of the PRO-91 is its capability to scan frequencies in the 25-1300 MHz range, which allows users to listen in on a variety of communications. This includes police, fire, and emergency services, as well as amateur radio transmissions and aircraft communications. The scanner supports both analog and some digital formats, making it adaptable to different communication standards and ensuring users stay updated with relevant broadcasts.

The PRO-91 comes with 200 programmable channels, allowing users to store their favorite frequencies for quick access. It also features a million frequency search capability, enabling it to detect active signals within the scanning range. Additionally, the scanner includes a priority channel function, permitting users to designate a specific frequency to continuously monitor while scanning through other channels.

Another notable characteristic of the PRO-91 is its triple conversion design, which enhances sensitivity and selectivity, resulting in improved audio clarity and reduced interference. The unit is equipped with a robust speaker that delivers clear sound quality, making it easy to understand transmissions even in noisy environments.

Users will appreciate the ergonomic design of the PRO-91, which features intuitive controls and a backlit LCD display for easy visibility, even in low-light conditions. The keypad layout is designed for straightforward operation, allowing even novice users to navigate through menus and settings with ease.

The PRO-91 is powered by a rechargeable battery, offering extended usage without the need for constant battery replacements. Its compact and lightweight construction makes it portable, making it suitable for on-the-go monitoring.

In conclusion, the Radio Shack PRO-91 offers an impressive array of features, technologies, and characteristics that cater to diverse scanning needs. With its wide frequency range, programmable channels, and superior audio quality, it stands out as a reliable choice for anyone looking to explore the world of radio communication. Whether for recreational use or professional monitoring, the PRO-91 ensures users remain connected to the signals that matter most.