Satellite Messaging
BDS Short Message & Tiantong Satellite Antennas
Integrated Tx/Rx antennas for BeiDou RDSS short message communication and Tiantong handheld satellite comms. L-band uplink, S-band downlink, RHCP/LHCP, up to 10 W transmit, IP67.
Application Overview
Why Satellite Messaging Antennas Are Built Differently
BDS short-message service (RDSS) is unique to BeiDou: a bidirectional satellite messaging capability that covers regions where cellular infrastructure is absent or unreliable — open ocean, remote border areas, high-altitude terrain, and forward operating environments. Antennas that serve RDSS must handle simultaneous L-band uplink transmission (around 1615 MHz) and S-band downlink reception (around 2491 MHz) without the two modes interfering — a design constraint that goes well beyond standard navigation antennas.
The GNSource BDS messaging line pairs dedicated helicals (TDXL-HB410 for S-band receive, TDXL-HB420 for L-band transmit with 10 W capability) with integrated combined antennas (BLS3001, BLS4001/4002, CZBLS4003) that collapse navigation + messaging into a single enclosure and single coax feed — ideal for maritime, vehicular, and aviation installations where cabling complexity is the constraint. The TDXL-SH166 handheld spiral integrates RHCP navigation and short-message reception with LHCP messaging uplink in a 100 g package.
The Tiantong TDXL-S1505 is a separate product line — S-band mobile satellite voice/data, not RDSS. Four-arm spiral, LHCP, ≤2 dB axial ratio, and 20 g weight make it suitable for handheld terminals operating over the Tiantong constellation. Note that RDSS and Tiantong services each require separate network authorization from the Chinese operator; GNSource supplies the antenna hardware only.
Key Specifications to Consider
Tx Power
Standalone Tx helicals support 10 W; integrated variants ship with ~5 W PA.
Tx/Rx Isolation
Combined antennas need ≥15 dB L↔S isolation to avoid self-jamming.
Axial Ratio
≤3 dB keeps cross-polar loss manageable on both links.
Connector & Feedline
TNC-KF waterproof for outdoor vehicle and marine installs.
Multi-Band Support
Single antenna handling B1I/B1C/B3I/L/S eliminates multiple antennas.
Product Catalog
BDS Short Message Models
9 models in this category. Click Request Quote on any row to pre-fill the inquiry form.
| Model | Type | Frequencies | Key Specs | Form Factor | Action | |
|---|---|---|---|---|---|---|
 | TDXL-SH166 | Spiral Rx/Tx Handheld | BDS B1I/B1C/B3I/L/S + GPS L1 | Active Rx + passive Tx · Dual-core connector · 30±3dB LNA | Ø23mm × 166mm · 100g · JSYZH | |
| TDXL-HB410 | Short Message Rx | BDS S (2491.75 ±4.08 MHz) | Passive · RHCP · Axial ratio ≤3dB · IP67 | Helical · Ø18.6 × 50.5mm · 16g · SMA-J | ||
| TDXL-HB420 | Short Message Tx | BDS L (1615.68 ±4.08 MHz) | Passive · LHCP · 10W power · Axial ratio ≤3dB · IP67 | Helical · Ø18.6 × 50.5mm · 16g · SMA-J | ||
 | TDXL-BLS3001 | Integrated Short Message | BDS B1/L/S | Rx+Tx integrated microstrip · Offset feed · Isolation ≤-15dB | Ø68 × 15mm · 100g · MCX (customizable) | |
 | TDXL-BLS4001 | Passive Multi-Band Combined | BDS B1I/B2b/B3I/L/S | All-band passive · Microstrip laminated · Phase center ±5mm | Ø132mm disc · 16g · TNC | |
 | TDXL-BLS4002 | Combined Short Message | BDS B3I/B1I/L/S | High gain · Offset feed · Customizable SMP-K connector | Ø84 × 21mm · 120g · SMP-K | |
 | TDXL-CZBLS4003 | All-in-One Surveying | BDS B3/B2/B1/L/S | LNA + 5W PA integrated · TNC-KF waterproof · GJB-compliant | Ø130 × 67mm · 360g · TNC-KF | |
 | TDXL-S1505 | Tiantong Handheld Satellite | Tx 1980–2010 MHz / Rx 2170–2200 MHz (S-band Tiantong) | LHCP · Four-arm spiral · Gain ≥2.5 dBi (axial) · Axial ratio ≤2.0 dB · VSWR ≤1.5 | Ø15 × 100mm · 20g · SMA-J | |
 | TDXL-BSWA23MH | BDS + WiFi Combined | BDS B1I/B1C/B3I · WiFi 2.4 GHz | 8-arm coupling + 4-point feed · Two-stage filtering · RHCP (BDS) + linear (WiFi) · Axial ratio ≤2dB | Combined helical · Handheld integration |
TDXL-SH166
Spiral Rx/Tx Handheld
- Frequencies
- BDS B1I/B1C/B3I/L/S + GPS L1
- Key Specs
- Active Rx + passive Tx · Dual-core connector · 30±3dB LNA
- Form Factor
- Ø23mm × 166mm · 100g · JSYZH
TDXL-HB410
Short Message Rx
- Frequencies
- BDS S (2491.75 ±4.08 MHz)
- Key Specs
- Passive · RHCP · Axial ratio ≤3dB · IP67
- Form Factor
- Helical · Ø18.6 × 50.5mm · 16g · SMA-J
TDXL-HB420
Short Message Tx
- Frequencies
- BDS L (1615.68 ±4.08 MHz)
- Key Specs
- Passive · LHCP · 10W power · Axial ratio ≤3dB · IP67
- Form Factor
- Helical · Ø18.6 × 50.5mm · 16g · SMA-J
TDXL-BLS3001
Integrated Short Message
- Frequencies
- BDS B1/L/S
- Key Specs
- Rx+Tx integrated microstrip · Offset feed · Isolation ≤-15dB
- Form Factor
- Ø68 × 15mm · 100g · MCX (customizable)
TDXL-BLS4001
Passive Multi-Band Combined
- Frequencies
- BDS B1I/B2b/B3I/L/S
- Key Specs
- All-band passive · Microstrip laminated · Phase center ±5mm
- Form Factor
- Ø132mm disc · 16g · TNC
TDXL-BLS4002
Combined Short Message
- Frequencies
- BDS B3I/B1I/L/S
- Key Specs
- High gain · Offset feed · Customizable SMP-K connector
- Form Factor
- Ø84 × 21mm · 120g · SMP-K
TDXL-CZBLS4003
All-in-One Surveying
- Frequencies
- BDS B3/B2/B1/L/S
- Key Specs
- LNA + 5W PA integrated · TNC-KF waterproof · GJB-compliant
- Form Factor
- Ø130 × 67mm · 360g · TNC-KF
TDXL-S1505
Tiantong Handheld Satellite
- Frequencies
- Tx 1980–2010 MHz / Rx 2170–2200 MHz (S-band Tiantong)
- Key Specs
- LHCP · Four-arm spiral · Gain ≥2.5 dBi (axial) · Axial ratio ≤2.0 dB · VSWR ≤1.5
- Form Factor
- Ø15 × 100mm · 20g · SMA-J
TDXL-BSWA23MH
BDS + WiFi Combined
- Frequencies
- BDS B1I/B1C/B3I · WiFi 2.4 GHz
- Key Specs
- 8-arm coupling + 4-point feed · Two-stage filtering · RHCP (BDS) + linear (WiFi) · Axial ratio ≤2dB
- Form Factor
- Combined helical · Handheld integration
Flagship All-in-One
TDXL-CZBLS4003 — Complete BDS Terminal with Integrated LNA and PA
The TDXL-CZBLS4003 is a complete BDS short message and navigation terminal in a single enclosure — receiving B1/B2b/B3 navigation signals and S-band downlink messages while transmitting L-band uplink at up to 36 dBm (≈4 W) saturated output. The symmetric offset-feed antenna design stabilizes phase center and minimizes installation error, while the integrated pre-cavity filter enhances interference rejection in crowded RF environments. Smart power management disables the transmit amplifier when not in use, reducing power draw. Single-cable output combines RF signal transmission and DC power through one TNC-KF waterproof connector, simplifying vehicle and vessel installation. Suitable for marine, vehicular, and shipborne platforms requiring long-term outdoor deployment.
- Operating bands
- BDS B3I · B2b · B1I · L (Tx) · S (Rx)
- Polarization
- RHCP (Rx) / LHCP (L-band Tx)
- Output impedance
- 50 Ω
- Gain at zenith
- B3I ≥3.5 dBi · B2b ≥5 dBi · B1I ≥3.5 dBi · L ≥3 dBi · S ≥3 dBi
- Elevation gain (20°)
- ≥-3 dBi across all bands
- Phase center
- ±2 mm
- LNA gain
- 38 ± 2 dB
- LNA noise figure
- ≤2.0 dB
- PA input power
- -35 dBm trigger / 0–5 dBm saturation
- PA output (P-1dB)
- 36 dBm (≈4W) saturated
- PA in-band gain
- 36 ± 1 dB
- Efficiency
- ≥35%
- Operating voltage
- +5V to +7V
- Operating current
- ≤2.5 A (Tx active)
- Connector
- TNC-KF (waterproof)
- Mounting
- Center pole screw mount
- Dimensions
- Ø130 mm × 67 mm
- Weight
- ≤360 g
- Colour
- White radome / black base
- Operating temperature
- -40°C to +70°C
- Storage temperature
- -55°C to +85°C
Get a Quote
Request a quote for BDS Short Message Communication antennas
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FAQ
BDS Short Message FAQs
Answers to common questions about BDS RDSS service, Tiantong, Tx power, and combining navigation with short-message in a single antenna.
What's the difference between BDS short-message (RDSS) and Tiantong mobile satcom?
BDS RDSS (Radio Determination Satellite Service) operates on L-band transmit (1615 MHz) and S-band receive (2491 MHz) for two-way short messages via BeiDou satellites — a China-controlled service with unique coverage. Tiantong is a separate Chinese mobile-satellite system at 1980–2010 / 2170–2200 MHz for voice and broader data. TDXL-S1505 supports Tiantong; TDXL-SH166, HB410/420, and the BLS / CZBLS series target BDS RDSS.
What transmit power do BDS L-band antennas support?
TDXL-HB420 handles 10 W LHCP transmit for BDS L-band RDSS uplink. Integrated CZBLS vehicle-mounted variants — CZBLS4001, CZBLS4003, CZBLS4006 — include approximately 5 W power amplifier in a single enclosure with TNC-KF waterproof interface, simplifying platform integration.
Is BDS short-message service available outside China?
BeiDou short message is a China-operated satellite service; regional availability depends on satellite coverage and local regulatory clearance. BDS-3 extends global short-message coverage with service-level limitations — consult the BeiDou service operator (China Satellite Navigation Office) for availability, terminal authorization, and pricing in your target region. GNSource supplies the antenna hardware; service provisioning is separate.
Can one antenna combine BDS navigation and short-message in a single cable?
Yes. TDXL-SH166, TDXL-CZBLS4003, and the BLS4001 / BLS4002 series integrate BDS B1I / B1C / B3I navigation reception with L-band transmit and S-band receive for short messages — a single antenna, single cable, and single connector to the terminal. This simplifies cabling on maritime, vehicular, and handheld platforms.
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