2W Tetra 400MHz Band Selective Repeater Wireless Signal Booster for House (GW-33BSRT)

Product Overview

The GW-33BSRT is a single-band RF repeater built for TETRA networks in the 400 MHz range, and its job is narrow and practical: put a usable radio signal into a building, tunnel or yard where the network currently fades out.

It works as a relay. A donor antenna on the roof or mast picks up the base station, the repeater amplifies that signal at the same frequency, and a coverage antenna re-transmits it into the area that needs it. The path runs both ways, so what a handheld transmits is amplified back toward the base station as well, which is what makes a conversation stable rather than one-sided.

Nothing in the traffic is decoded along the way. Talkgroups, signalling and encryption pass through unchanged, so handsets and vehicle radios from different manufacturers are served by the same unit as long as they operate in the repeated band.

This is coverage repair rather than coverage creation. A wireless signal booster of this kind is installed where a usable base station signal already exists at the donor antenna, and it lifts that signal into the parts of the site the base station cannot reach directly.

The cabinet is a wall-mount aluminium enclosure rated IP65, with a hinged front panel and a latch, so the connector face opens for commissioning and cable checks without the unit coming off the wall.

Typical owners are facilities and security teams, site managers, radio dealers and installers who have a working TETRA network and one building, tunnel or compound inside it that it does not reach. The same design is built in band-selective and channel-selective versions and in four power classes, so a small office block and a larger outdoor site can both be served from one platform.

Key Features

• IP65 aluminium housing — the metal cabinet resists dust, water and corrosion, so the unit can live in a plant room, a riser or a protected outdoor position instead of a climate-controlled rack.
• Two-way amplification — the downlink to the radios and the uplink back to the base station are both amplified, so this mobile signal booster improves what the radio hears and what the network hears from it.
• Selective channel handling — in the channel-selective build the selector processes several channels at the same time, so a talkgroup plan spread over a handful of carriers can be repeated without opening the whole band.
• Clean, low-noise amplification — a high-gain linear amplifier keeps the output clean, which is how the design avoids pushing interference back into the base station.
• Sharp filtering in both directions — high-selectivity filters with low insertion loss keep uplink and downlink apart so the two paths do not bleed into each other.
• Supervision built in — a USB port connects to a notebook for local checks; with the built-in wireless modem fitted, the same link reaches the network management system for status monitoring and parameter downloads.

Specifications

Band Splits and Selectivity

The two builds answer different questions on site, and the choice is made when the unit is ordered.

Take the band-selective version when the network's carriers sit together inside one assigned block and you want everything in that block to benefit. The repeater then amplifies the whole band, with the bandwidth set when the unit is made to match the allocation.

Take the channel-selective version when the spectrum around you is crowded, or when only certain carriers should be repeated. The selector is set for 1, 2, 4, 8, 12 or 16 channels and passes those alone, which keeps the footprint narrow and reduces the chance of lifting traffic nobody asked for.

Band splits matter just as much as selectivity. The unit is made for TETRA 400 MHz, with 410-414 MHz and 420-424 MHz among the standard splits and other splits made to the operator's band plan. Send the exact uplink and downlink ranges your network uses before the order is released, because the bandwidth is fixed when it's built and cannot be switched on site.

If you have been comparing this with a cell phone signal booster, the deciding question is the band rather than the power. That product class is built around the cellular bands phones use; this repeater is cut for the 400 MHz TETRA band, so the two are not interchangeable even when the cabinets look similar.

Installation and Commissioning

1. Survey the donor side first. Find a position where the base station is received clearly and at a workable level; a wireless signal booster can only lift a signal that is already there, and the area to be covered should sit within about 2 km of the base station.
2. Fix the donor antenna. Mount it outdoors, aimed at the base station, with the clearest path you can find and clear of metalwork that would block it.
3. Set the coverage antenna and keep the two apart. The coverage antenna has to face away from the donor antenna, and the physical separation between them has to meet the isolation the site needs. This single detail decides whether the installation behaves.
4. Mount the repeater. Fit the cabinet on the wall or in a protected outdoor position, bring the coax in with drip loops, and keep the cable entries below the connectors so water cannot track inside.
5. Check for feedback before you leave. If the repeater feeds back into its own donor path — usually through poor antenna separation or a coverage antenna aimed the wrong way — the symptom shows up immediately. Increase separation, re-aim, or reduce output until the loop is gone.
6. Commission locally, then remotely. Connect a notebook to the USB port to check status on site, then bring the NMS link up where the wireless modem is fitted so future checks do not need a visit.
7. Record the final positions and settings. Note both antenna headings and the settings in a site file; if someone re-aims an antenna in a year's time, the next engineer has a baseline to work from.

Typical Installations

• Basements and car parks — the floors furthest from the base station, where handhelds lose the network as soon as the lift doors close.
• Multi-floor offices and hotels — a single coverage antenna at the right height, or an indoor distribution system fed from the repeater, keeps staff and security teams in contact across the building.
• Tunnels and service roads — where the base station simply cannot see around the bend, but a donor antenna at the portal still hears it clearly.
• Factories, warehouses and mining or construction sites — large steel or concrete structures that swallow the signal, plus yards where vehicle radios drop out between buildings.
• Villages, highways and remote compounds — fringe areas that sit inside base station coverage but not reliably enough for everyday traffic.
• Sites with phone coverage but no radio coverage — where a commercial cell phone signal booster keeps the phones working, yet TETRA handsets still go silent in the stairwell or plant room, the missing piece is coverage in the radio band.

Choosing Between Repeater Types

Operation and Upkeep

Once it is commissioned, the repeater needs very little attention. The parts around it need more.

Start with the antennas after storm season. A donor or coverage antenna that has shifted a few degrees is the most common reason a working installation starts to sound worse, and a visual check with a re-aim costs far less than a repeat visit later.

Keep the cable entries sealed and the connectors dry. The IP65 cabinet protects what is inside it, but a connector left open to weather is a path for water straight into the housing, so replace cracked boots and re-tape joints during the inspection.

Clean the exterior and the connector face with a damp cloth. Dust on a front panel is harmless, but a build-up around the ports makes a loose connector harder to spot during a fault.

Write down what you find. Band split, power class, channel settings and both antenna headings belong in a simple site file, so the next engineer does not have to reverse-engineer them.

Watch for the signature of a feedback loop rather than a dead unit: coverage that narrows on its own, or a repeater that quiets down when a nearby door is opened. That usually means the antenna separation has changed, not that the electronics have failed.

An indoor cell phone signal booster is often left on a shelf and forgotten. This unit is wall-mounted, frequently outdoors, and tied to two antennas that see weather all year, so one short inspection a year is the whole maintenance programme.

Ordering Notes

• Send the band plan first. The uplink and downlink ranges your network actually uses decide how the unit is built — 410-414 MHz and 420-424 MHz are the common splits, and other splits are built to the operator's allocation.
• Name the power class you want. The 33, 37, 40 and 43 dBm versions share one design; the right one follows from the size of the area to be covered and the antenna plan you have in mind.
• Say which build you need. Band-selective for the whole assigned block, or channel-selective with the list of carriers you want repeated.
• Describe the site. Distance and direction to the base station, photos of the likely donor antenna position, building height, and the rooms or areas where radios drop out.
• List what is already installed. A commercial cell phone signal booster, an older repeater, existing coax or a roof antenna — tell us what is there and we will say what can be reused at 400 MHz and what has to change.
• Confirm the antenna and cable scope in your quotation. Donor antenna, coverage antenna, coax, connectors and mounting hardware are chosen for the site rather than bundled by default.
• Ask your sales contact for the documents the operator will want. Band, output power and antenna details are usually what the licence holder asks to see before a unit goes on air.
• Confirm packing, lead time, shipping and payment terms with your sales contact. They depend on the configuration and the destination, and are quoted with the order.

Technical Support & Model Matching

Getting the right model matters more than anything else, so Greetwin builds technical support into every order. Tell us the band, the site and the coverage you need, and our engineers will match a model to it, check gain and output power against your installation, and say plainly when something will not fit. We also advise on antenna placement, cabling and commissioning, then stay with you through troubleshooting once the system is running. All of this is backed by our ISO 9001 certified production in Shenzhen, responsive after-sales service and spare parts.

FAQ