3915D-HR RF Antenna Equivalent & Substitute Parts

Part Overview

The 3915D-HR is a 1.575GHz GPS module RF antenna manufactured by PCTEL, Inc., designed for navigation applications with SMA magnetic termination. This component operates within the UHF frequency band (1GHz ~ 2GHz) and features integrated cable, LNA, and filter functionality with IP67 ingress protection.

The 3915D-HR is classified as obsolete. Identification of equivalent and substitute parts is necessary to maintain system compatibility and ensure continued availability for GPS navigation applications where this antenna is specified.

Substiute Parts

3915D-HR

PCTEL, Inc.In Stock: 7423915D-HR Datasheet

Current PartRFQ

8111D-HR

PCTEL, Inc.In Stock: 10388111D-HR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3915D-HR is determined by the following critical parameters:

Frequency Compatibility: The substitute part must operate within or encompass the 1.565GHz ~ 1.585GHz frequency range of the original component. The substitute must support GPS navigation frequency bands.

Physical Interface: The substitute must maintain SMA termination and magnetic mounting to ensure mechanical and electrical compatibility with existing system installations.

Environmental Protection: The substitute must maintain IP67 ingress protection rating for equivalent environmental durability.

Integrated Features: The substitute must include cable, LNA, and filter functionality as specified in the original design.

Antenna Module Configuration: The substitute must be a module-type antenna to match the form factor and integration approach of the original component.

The 8111D-HR meets these substitution criteria through frequency range overlap, identical termination and mounting specifications, maintained IP67 protection, and equivalent integrated feature set.

Parameter Comparison

Engineering Selection Recommendations

For GPS-Only Applications: The 3915D-HR operates at 1.575GHz with a frequency range of 1.565GHz ~ 1.585GHz, which aligns with standard GPS L1 frequency specifications. The 8111D-HR substitute provides a broader frequency range (1.561GHz ~ 1.608GHz) that encompasses GPS frequencies while extending coverage to additional GNSS standards.

Product Status Consideration: The 3915D-HR is obsolete, whereas the 8111D-HR is active. Selection of the 8111D-HR ensures access to current manufacturing, quality assurance, and supply chain continuity.

Compliance and Environmental Standards: The 8111D-HR carries ROHS3 compliance certification, providing assurance of regulatory alignment with current environmental standards. Both components maintain IP67 ingress protection for equivalent environmental durability.

Physical Integration: The 8111D-HR has a reduced maximum height (0.472" versus 0.535"), which may provide advantages in space-constrained installations while maintaining identical SMA magnetic mounting interfaces.

Multi-Standard Capability: The 8111D-HR supports Beidou, Galileo, GLONASS, and GNSS in addition to GPS, providing expanded positioning system compatibility without requiring component redesign.

Frequently Asked Questions (FAQ)

Q: Can the 8111D-HR directly replace the 3915D-HR in existing GPS systems?

A: The 8111D-HR maintains identical SMA termination and magnetic mounting specifications, enabling direct physical installation. The frequency range of 1.561GHz ~ 1.608GHz encompasses the original 1.565GHz ~ 1.585GHz operating band, ensuring electrical compatibility for GPS applications. Both components include 5m cable, LNA, and filter features with IP67 protection.

Q: What is the primary difference in antenna gain between these components?

A: The 3915D-HR specifies gain as -2dBic to 3dBic, while the 8111D-HR specifies 26dBi. These measurements use different reference standards (dBic versus dBi), reflecting different antenna gain measurement methodologies. The 8111D-HR's higher specified gain indicates enhanced signal reception capability.

Q: Does the 8111D-HR support GPS-only operation, or is multi-standard support mandatory?

A: The 8111D-HR supports GPS operation within its frequency range. The component also supports Beidou, Galileo, and GLONASS standards, but GPS-only systems can operate the 8111D-HR without utilizing additional positioning system bands.

Q: Are there packaging or inventory differences between these components?

A: The 3915D-HR is listed as obsolete with 646 pieces in stock. The 8111D-HR is active with 965 pieces in stock and is packaged in bulk format. The active status and bulk packaging of the 8111D-HR indicate current manufacturing and distribution availability.

Q: What is the significance of the ROHS3 compliance on the 8111D-HR?

A: ROHS3 compliance indicates adherence to current Restriction of Hazardous Substances regulations, ensuring the component meets environmental and safety standards for electronic equipment. The 3915D-HR does not specify RoHS status, whereas the 8111D-HR explicitly certifies compliance.

Q: How does the reduced height of the 8111D-HR affect system integration?

A: The 8111D-HR maximum height is 0.472" (12.00mm) compared to the 3915D-HR at 0.535" (13.60mm). This 0.063" reduction may provide advantages in applications with vertical space constraints while maintaining all functional and interface specifications.

Q: Is VSWR specification critical for GPS antenna selection?

A: The 8111D-HR specifies VSWR at 1.5, indicating impedance matching efficiency. The 3915D-HR does not provide VSWR specification. VSWR values below 2.0 are generally acceptable for GPS applications, and the 8111D-HR's specification demonstrates controlled impedance characteristics.