Handheld Scanner With 800 MHz Coverage Pro-24

Key Specifications:
Frequency Range: Covers several bands including 29–54 MHz, 137–174 MHz, 406–512 MHz, and 806–956 MHz (excluding cellular).
Memory: Features 16 programmable channels.
Power: Operates on four AA batteries (alkaline or rechargeable) or an external 4.8–6 VDC power supply.
Features: Includes a channel monitor, NOAA weather channels, and a 50-ohm BNC antenna connector. 

LCD channel number display has indicators for Weather search mode, key lock and
channel lockout status. Programmed frequencies are displayed one digit at a time when you push the review button. On -top jack for adding an earphone, our lapel -clip speaker or external speaker. Low -battery alert and backup system preserve memory contents when you change batteries.

User Reviews and Expert Insights:
Versatility: Reviewers on eBay and RadioReference describe it as a dependable, sleek, and compact choice for on-the-go use, particularly for monitoring UHF and VHF frequencies.
Legacy Limitations: Experts on RadioReference note that the older 4-channel crystal model is mostly a collector's item today, as it is limited to only 4 frequencies and cannot monitor modern digital or trunked radio systems.
Performance: The programmable version is praised for its triple-conversion circuitry (in related models), which helps eliminate interference from intermediate frequency images. 
 

Here you find 2814 models, 2745 with images and 167 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Radio Shack (Tandy, Realistic, Micronta); USA