If the manufacturer is , these could work:
Visit https://www.tempocomm.com/support and search "NetSet Pro44" in the legacy products section. netset pro44 scanner manual link
Search Google or Bing with these strings: If the manufacturer is , these could work:
Since the PRO-44 is internal hardware-equivalent to the Realistic PRO-62 , users often reference the PRO-62 Manual for operational guidance. Key Specifications Channels 50 regular memory channels Modes Frequency Range (Europe) 68–88 MHz, 108–174 MHz, 380–512 MHz Frequency Range (USA) 30–54 MHz, 108–174 MHz, 380–512 MHz Power Supply 9 VDC (Six AA alkaline or NiCd batteries) Antenna BNC connector (50 ohm) How to Program the Netset PRO-44 If the manufacturer is