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TW4421 Wideband Dual Feed GPS/GLONASS Antenna


The TW4421 is a low-cost, dual-feed GPS & GLONASS magnetic mount antenna by Tallysman Wireless covering the GPS L1, GLONASS G1 and SBAS (WAAS, EGNOS & MSAS) frequency bands.

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SKU: 33-442 Categories: , Manufacturer: Tallysman Wireless

TW4421 Wideband Dual-Feed GPS/GLONASS Antenna

This low-cost dual-feed GPS & GLONASS magnetic mount antenna by Tallysman Wireless covers the GPS L1, GLONASS G1 and SBAS (WAAS, EGNOS & MSAS) frequency band (1574 to 1606 MHz). The TW4421 features a novel 25mm dual feed wideband patch element that provides excellent multipath rejection and a more linear carrier phase response by virtue of the axial ratio that is greatly improved across the full frequency bandwidth. It is especially suited to high accuracy applications; it also offers high out-of-band signal rejection.
The two feeds from the patch element are summed in a 90 degree hybrid then input to a first-stage Low-Noise Amplifier (LNA), followed by a mid-section SAW and a second low-noise gain stage.
The TW4421 is one of the smallest dual-feed, high-performance antennas available. It comes with a wide range of connector options and cable length and is housed in a compact IP67 magnetic mount enclosure.
If you want a pre-filter option, please see the TW4422. It has a pre-filter which increases the antennas immunity to high amplitude interfering signals, such as LTE and other cellular signals
  • Cost Sensitive Mission Critical Positioning
  • Military & Security
  • Covert surveillance
  • Fleet Management & Asset Tracking
  • Dual feed patch element
  • 40% wider bandwidth, small footprint
  • Axial ratio: 3 dB Max. (GPS & GLONASS)
  • Low noise LNA: 1 dB
  • High rejection mid-section SAW filter
  • High gain: 28 dB typ.
  • Wide voltage input range: 2.5 to 16 VDC
  • 1dB Bandwidth Includes GPS-L1 & GLONASS
  • Greatly enhanced multipath rejection
  • Improved GNSS reliability
  • Excellent signal to noise ratio
  • RoHS compliant
  • Ideal for harsh environments
  • Excellent out of band signal rejection

LNA Pre-filter Available

If you need enhanced protection against high level sub-harmonic signals like LTE and near frequency signals such as WiFi, the alternative provides these additional TW4422 benefits with an LNA pre-filter.

To minimize performance impact from signal jamming threats, the pre-filtered version of this antenna is compatible with Tallysman’s Anti-Jamming add-on, which modifies the radiation pattern of the GNSS antenna to eliminate signals arriving from -10° to +15° from horizon, while slightly increasing the gain of the antenna at zenith.


Tallysman TW4421 Wideband Dual-Feed GPS / GLONASS Antenna Data Sheet

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Tallysman Connector and Cable Options

Tallysman offers a number of connector and cable options for its antennas. Use the guide below to find the available options for your antenna or contact us for help.

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