20dBm Aws1700 Fixed Band Selective Repeater/Signal Booster (GW-20AS)

Product Overview

Indoors, an AWS1700 phone often shows one bar where the street outside shows four. The signal that reaches the middle of a building is a fraction of what is available at the wall, and no handset can make up that difference. This compact repeater is built to close the gap. A donor antenna fixed outside picks up the base station, the unit amplifies that signal on the AWS1700 band, and a service antenna inside re-broadcasts it through the rooms people actually use.

The unit is rated at 20 dBm and is fixed to the AWS1700 band, so it amplifies the band the phones in the building are already working on rather than the whole spectrum. That band-selective approach is what keeps the hardware small and modest in power draw, and it is why the same box suits a house, a small office, a restaurant or a small guesthouse.

Nothing is added to the handset. There is no app, no pairing step and no SIM: phones, tablets, dongles and other cellular devices working in that band simply see a stronger signal, and calls, messages and data sessions behave the way they do when you stand near a window.

For a small business, this is a practical commercial cell phone signal booster. One unit covers the area a café, a restaurant or an office floor occupies, without a rack of amplifiers or a technical room. It is a morning's work for anyone comfortable on a ladder: two coaxial runs, a well-chosen antenna position at each end, and the gain set once from the front panel.

Key Features

• It closes the gap between outside and inside — a phone that shows four bars in the street and one bar in the kitchen has a signal-strength problem rather than a phone problem, and one unit puts usable signal back into the rooms you actually use.
• One compact unit, no equipment room — low power consumption and a small footprint mean it can sit on a shelf and stay powered up continuously, with no cabinet of parts to house.
• Nothing to install on the phones — no app, no SIM pairing and no handset settings; compatible devices simply work better inside the covered area.
• Economical next to a distributed antenna system — for a house, a restaurant or a small office floor, one unit and two antennas do the job that would otherwise need a multi-antenna installation.
• The same hardware for a home or a small business — the unit is bought as a cell signal booster for home use as often as it is fitted behind the counter of a restaurant or in a small office.

Housing and Front Panel

The unit is a black, rectangular desktop box with a finned top and sides. Those ridges are the cooling system: heat from the amplifier passes into the metal and spreads across the surface, so the housing does the work with nothing to draw dust into the electronics. The finish is a matte black that hides handling marks, and there are screw-mount holes in the chassis if you would rather fix the unit to a wall or inside a cupboard than stand it on a shelf.

The front panel gathers the working parts. A gloss window covers the digital display, with indicator lights beside it, and the power switch, the DC input and the threaded coaxial connectors for the donor and service antenna leads all sit on the same face. The Greetwin badge is on the top of the case.

That layout is deliberate for an indoor cell phone signal booster: everything an installer needs to check — power, gain, band and running state — is readable from the front, so commissioning does not mean pulling the unit out of a cupboard or reaching behind it. The display stays useful afterwards as well, showing at a glance whether the unit is running normally.

Technical Specifications

Where It Works

• Flats and houses with one weak side — the rooms furthest from the nearest mast suffer first, so the service antenna goes centrally and the bedrooms and living rooms get the benefit rather than only the hallway.
• Basements, back rooms and converted lofts — space below or behind ground level is where an outdoor signal dies, and a unit placed in the stairwell or utility area usually reaches the rooms around it.
• Home offices and small company offices — meeting rooms and back offices tend to be the worst seats in the building and also the places where calls matter most.
• Restaurants and cafés — this is the kind of commercial cell phone signal booster a small venue needs: guests and staff served by the same unit, with the service antenna kept clear of the kitchen's metalwork.
• Small hotels and guesthouses — guests judge a room partly by whether their phone works, and one unit can cover a floor of rooms where the outdoor signal is usable at roof level.
• Retail units and small arcades — shoppers and staff moving through the space stay connected, provided the outdoor antenna is sited where the base station signal is clean.

Bands and Device Compatibility

The unit repeats the AWS1700 band, so anything working in that band benefits: smartphones, tablets, mobile broadband dongles and the voice, data and video sessions that run over them. There is no device list to manage and no app to install — if a device is on the band and inside the covered rooms, it uses the repeated signal.

Greetwin builds this indoor pico family across a long list of standards — CDMA450, LTE800, iDEN, CDMA800, GSM, EGSM, AWS1700, DCS, PCS, WCDMA and LTE2600 — and this is the AWS1700 fixed-band model in that family. If your operator serves the building on a different band, the same chassis exists in other versions, so it is worth confirming the band before you settle on a model.

The family is available in two configurations. A wide-band version amplifies everything inside its frequency range, which helps where several bands are in play or where subscribers move between them. A custom band-selective version amplifies only the slice you specify — the right choice when a site needs one operator's band and nothing else. On wide-band units the working band is chosen from the front panel; on this fixed-band model the band is set in the hardware.

If you are not sure which band reaches your building, ask your operator before ordering. It is the one detail that decides whether a repeater is the right purchase at all.

Installation and Antenna Setup

1. Check the signal outdoors first, standing where the donor antenna will go — a repeater can only amplify a signal that already exists at the donor position.
2. Fix the donor antenna to the outside wall or roof, aimed at the base station, with the shortest practical cable run back inside.
3. Run coaxial cable from the donor antenna to the donor port on the unit, and weatherproof the outdoor connector.
4. Mount the service antenna inside, centrally and high up, clear of metal ceilings, lift shafts and large appliances, facing the rooms you want covered.
5. Keep the two antennas physically separated and facing away from each other, so the mobile signal booster is not picking up its own output; the building fabric between them is what makes this work.
6. Power the unit up — the front panel is where the commissioning settings are made.
7. Walk the rooms with a phone on a call and check the result; a small change in antenna height or angle usually does more than any other adjustment.

Gain and Band Control

• Digital setting instead of DIP switches — gain and working band are set from the front panel, which is faster and less error-prone than counting tiny switches by torchlight.
• Raise the gain in small steps — bring it up until the covered rooms behave well and stop there; pushing further buys nothing and unsettles the unit.
• Read the indicators before blaming the hardware — an alarm usually means the two antennas are seeing too much of each other, or that the outdoor signal is stronger than the setting allows; lower the gain or increase the separation and it clears.
• Band choice is a setting, not a rebuild — wide-band versions let you choose the working band from the panel, while this fixed-band AWS1700 model is set in the hardware and needs no band selection.
• One commissioning visit is normally enough — once the mobile signal booster is set up, there is nothing to adjust day to day.

Interference Control

An amplifier that is simply loud is easy to build and hard on a live network. This unit uses a high-linearity amplifier with ALC, so output stays inside a safe window even when the outdoor signal swings — stronger in the morning, weaker when traffic changes. The built-in AGC circuits read the incoming level continuously and trim the gain to match, so the unit keeps working as conditions move instead of overdriving.

That matters beyond the equipment. A repeater that over-amplifies can lift the noise floor around a base station and affect other subscribers, which is precisely what operators object to. Holding the output steady is what makes a cellular signal booster acceptable on a working network and predictable in daily use.

Both directions are handled. The downlink from the base station is amplified into the building, and the uplink from handsets is amplified back out, so outgoing calls and uploads are as usable as incoming ones. Several people can be on calls or moving data at the same time without one heavy user crowding out the rest.

There is an efficiency gain as well. When a phone sees a healthy signal it turns its own transmit power down, so batteries last longer through the working day, handsets run cooler during a long call, and users notice fewer dropped calls as well as less battery anxiety.

Ordering and Delivery

• Tell us the configuration — AWS1700 fixed band is the standard build; wide-band and custom band-selective versions are available, so say which one your site needs.
• Share the site, not just the model — floor area, number of rooms and dividing walls, where the outdoor antenna can be mounted, and roughly how long the cable run is. That is what turns a general recommendation into one that fits.
• Confirm what is in the box for your order — the repeater unit is the core; the power adapter, mounting hardware, antennas and coaxial cable depend on the configuration, so check the content list with your sales contact before it ships.
• Check the power adapter for your country — the unit is fed from a DC input and plug types vary between markets; confirm the adapter you need when ordering.
• Lead time, packing and freight are quoted per order — ask your sales contact for the current lead time, packing details and shipping terms to your address.
• Documentation for projects — if a site or an operator needs test reports or compliance paperwork, say so early and we will tell you what is available.
• Single units and multi-site orders — whether it is one cell signal booster for home use or units for several sites, tell us the quantity and we will quote accordingly.

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