3911D-HR-2M-SMA RF Antenna Equivalent & Substitute Parts

Part Overview

The 3911D-HR-2M-SMA is a 1.575GHz GPS module RF antenna manufactured by PCTEL, Inc., designed for navigation applications requiring magnetic mounting and SMA termination. This antenna operates within the UHF frequency band (1GHz ~ 2GHz) with a center frequency of 1.575GHz and a frequency range of 1.565GHz ~ 1.585GHz. The unit features integrated LNA and filter components, IP67 ingress protection, and includes a 2-meter cable assembly.

The 3911D-HR-2M-SMA is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain system compatibility, ensure continued availability, and support ongoing production or field replacement requirements.

Substiute Parts

3911D-HR-2M-SMA

PCTEL, Inc.In Stock: 7193911D-HR-2M-SMA Datasheet

Current PartRFQ

3917D

PCTEL, Inc.In Stock: 8333917D Datasheet

MFR RecommendedRFQ

8117D

PCTEL, Inc.In Stock: 8588117D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3911D-HR-2M-SMA are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Center frequency and frequency range alignment with GPS/GNSS/GLONASS navigation standards
• Antenna type (Module)
• Termination type (SMA or SMA Male)
• Mounting type (Magnetic)
• Ingress protection rating (IP67)
• Integrated features (LNA, Filter)
• Gain specifications (-2dBic, 3dBic)

Substitute Parts:

1. 3917D - Active substitute with identical center frequency (1.575GHz), matching frequency range (1.565GHz ~ 1.585GHz), SMA Male termination, magnetic mounting, IP67 protection, and integrated LNA/Filter. Primary difference: 3-meter cable assembly versus 2-meter cable on main part.

2. 8117D - Active substitute with center frequency of 1.593GHz and extended frequency range (1.568GHz ~ 1.618GHz), supporting both GLONASS and GPS applications. Maintains SMA Male termination, magnetic mounting, IP67 protection, and integrated LNA/Filter. Primary difference: broader frequency coverage and 3-meter cable assembly.

Parameter Comparison

Engineering Selection Recommendations

For GPS-Only Applications:

The 3917D is the primary substitute for the 3911D-HR-2M-SMA. Both parts operate at the identical center frequency of 1.575GHz with matching frequency range specifications (1.565GHz ~ 1.585GHz). The 3917D is currently in active production status with RoHS compliance certification. The primary design difference is the cable length: 3 meters versus 2 meters on the original part. This substitution maintains full functional compatibility for GPS navigation systems.

For Multi-Constellation GNSS/GLONASS Applications:

The 8117D provides an alternative with extended frequency coverage (1.568GHz ~ 1.618GHz) and support for both GLONASS and GPS standards. The center frequency of 1.593GHz and broader frequency range enable operation across multiple satellite navigation systems. This part is also in active production with RoHS compliance. The 8117D is suitable when system requirements expand to include GLONASS constellation support or when broader frequency tolerance is beneficial.

Compliance and Availability:

Both substitute parts maintain the same ingress protection rating (IP67), mounting configuration (magnetic), and integrated component set (LNA, Filter). Both are manufactured by PCTEL, Inc., and carry RoHS compliance certification. Current inventory levels support immediate procurement: 3917D (749 units) and 8117D (821 units).

Frequently Asked Questions (FAQ)

Q: Can the 3917D directly replace the 3911D-HR-2M-SMA in existing GPS systems?

A: Yes. The 3917D operates at the identical center frequency (1.575GHz) and frequency range (1.565GHz ~ 1.585GHz) as the 3911D-HR-2M-SMA. Both parts feature SMA termination, magnetic mounting, IP67 protection, and integrated LNA/Filter components. The primary difference is the cable assembly length (3 meters versus 2 meters). Verify cable routing requirements in your installation before substitution.

Q: What is the difference between the 3917D and 8117D substitutes?

A: The 3917D maintains the exact frequency specifications of the original part (1.575GHz center, 1.565GHz ~ 1.585GHz range) and is optimized for GPS applications. The 8117D operates at 1.593GHz with an extended frequency range (1.568GHz ~ 1.618GHz) and supports both GLONASS and GPS constellations. Select the 3917D for GPS-only systems and the 8117D when multi-constellation capability is required.

Q: Are there mechanical compatibility concerns when substituting these parts?

A: All three parts share identical maximum height specifications (0.535" or 13.60mm) and magnetic mounting configuration. The primary mechanical consideration is cable length: the 3917D and 8117D both provide 3-meter cables compared to the 2-meter cable on the 3911D-HR-2M-SMA. Ensure your installation accommodates the longer cable or plan for cable management accordingly.

Q: What is the significance of the SMA Male termination on the substitute parts?

A: The 3911D-HR-2M-SMA specifies SMA termination, while both substitute parts (3917D and 8117D) specify SMA Male termination. SMA Male is the standard connector configuration for RF antenna assemblies. Verify that your system interface accepts SMA Male connectors. If your system requires a different connector gender, additional adapter components may be necessary.

Q: Why is the 3911D-HR-2M-SMA classified as obsolete?

A: The 3911D-HR-2M-SMA is no longer in active production. The 3917D and 8117D represent the current active product line from PCTEL, Inc., for GPS and multi-constellation navigation antenna modules. Both substitute parts offer equivalent or enhanced functionality with current manufacturing support and compliance certifications.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both the 3917D and 8117D carry RoHS compliance certification. The original 3911D-HR-2M-SMA does not specify RoHS status in available documentation. If RoHS compliance is a system requirement, the substitute parts satisfy this requirement.

Q: Can the 8117D be used in applications designed for GPS-only operation?

A: Yes. The 8117D supports GPS operation within its frequency range (1.568GHz ~ 1.618GHz), which encompasses the GPS L1 frequency band. The extended frequency range and GLONASS capability do not prevent GPS-only operation. However, the 3917D is the more direct substitute if GPS-only functionality is the sole requirement, as it maintains the exact frequency specifications of the original part.