Data Products PG 404 Pattern Generator Dantel Inc Portable Handheld Test 1974

Data Products PG 404 Pattern Generator Dantel Inc Portable Handheld Test 1974

The Data Products PG 404 is a portable, battery-powered pattern generator manufactured by Dantel, Inc. of Fresno, California, dating to December 1974. Pattern generators of this type were used to inject test patterns into data and telecommunications circuits for fault isolation, continuity checking, and signal path verification. This is a vintage 1970s-era handheld instrument from the early period of dedicated portable data circuit test equipment.

Specifications & What's Included

• Manufacturer: Data Products (OEM/label: Dantel, Inc., Fresno, CA 93727)
• Model: PG 404
• Type: Pattern Generator
• Date of Manufacture: December 1974 (12/74 per equipment label)
• Form Factor: Portable / Handheld
• Power Source: Internal rechargeable battery (not charging — see condition)
• Rear panel outputs: SIG (banana jack, red), Low Level (banana jack), Neutral/Loop terminals
• Housing: Two-tone gray and blue molded enclosure
• Assembly Number: A/N 0610
• Serial Number: 0026
• Sold as-is, unit only — no accessories, manual, or charger confirmed included

Applications

Pattern generators like the PG 404 were standard tools in data communications and telecom test work during the 1970s and early 1980s. They inject repeating bit patterns — such as pseudo-random sequences or fixed mark/space patterns — into a circuit under test, allowing a technician to verify signal integrity, check for bit errors, and isolate faults in data links and terminal equipment. The PG 404 was designed for field portability, enabling technicians to test circuits at remote sites or equipment racks without a bench setup. Dantel, Inc. was a Fresno, California-based manufacturer of data communications test equipment active during this era. Instruments like this were used by telephone companies, data center technicians, and terminal equipment installers working with early digital data circuits. Today units like this are of interest to vintage test equipment collectors, telecommunications historians, and technicians working on restoration or legacy circuit maintenance.