GNSS Filtered Bias Tee GPS L1-L5 GLONASS BeiDou Navic 1100-1700 MHz

PRODUCT OVERVIEW 

This is a filtered GNSS bias tee covering GPS L1-L5, GLONASS, BeiDou/COMPASS, and Navic in a single 1100–1700 MHz passband. It combines the same bandpass filtering as our standalone GNSS filters with its own independent power injection.

Unlike a passive DC-bypass filter — which only passes through whatever power your receiver already provides — this bias tee supplies its own regulated +3.3V to the antenna, sourced from either a micro USB cable or an external +4V to +16V DC input. That power is independent of your receiver entirely. It can also be used as a plain bandpass filter with no supply connected at all.

The filter uses SMA-F connectors and operates across a -40°C to +85°C range.

Where you'd use this

Use this bias tee when your receiver doesn't power your active antenna adequately; or at all.

A few specific situations:

• Your receiver has no bias-voltage output for the antenna (common on many SDR dongles and some receiver modules).  This bias tee supplies the power your receiver doesn't.
• Your receiver provides some bias voltage, but not enough current for your specific active antenna. Since this unit draws from its own external USB or DC supply rather than the receiver's limited output, it isn't constrained by whatever current your receiver's built-in bias circuit can deliver.
• You want filtering and power injection in one part, rather than a separate filter plus a separate general-purpose bias tee.

If your receiver already supplies adequate power to your antenna and you just need filtering, the standalone DC bypass filter passes that existing power through and typically costs less. If there's no DC anywhere in your chain at all, the standard filter is the simplest option.

APPLICATIONS

GNSS signals arrive extremely weak — often 20–30 dB below the noise floor before despreading even helps. Strong nearby sources like cellular, LTE, UHF, and 915 MHz/2.4 GHz ISM-band transmitters can desensitize a receiver even when they're not close in frequency. This bias tee rejects that interference while independently powering your active antenna.

Typical uses:

• Powering an active GNSS antenna when your receiver can't supply adequate current
• GNSS reception in weak-signal environments (rooftop, under canopy, indoor-adjacent installs)
• Receivers or SDRs with no built-in antenna bias voltage

SPECIFICATIONS