Answer first: the GDW1000 is a self-contained tri-band commercial repeater that a competent owner or office manager can install without a professional engineer. The whole job breaks into ten factual stages: (1) confirm a usable outdoor signal on Band 8, Band 3 and Band 1; (2) choose a Yagi mounting point 3 to 5 m above roofline with a clear bearing to the serving mast; (3) keep the donor Yagi and indoor panel at least 10 m apart vertically; (4) connect the 10 m outdoor coax to the BS port and the 5 m indoor coax to the MS port; (5) extend the outdoor run to 20, 30, 40 or 50 m only when the supplied length cannot reach across a 1000 m² footprint; (6) place the amplifier chassis centrally so the 5 dBi panel reaches every zone; (7) connect antennas before plugging in the AC adapter; (8) read the per-band LED indicators while the automatic gain control warms up; (9) test calls, 4G speed and 3G fallback zone by zone; and (10) add a second indoor panel only where one panel cannot reach a distant room. This guide explains each stage with the exact dBm ranges, heights, port labels, cable lengths and timings the GDW1000 needs for 1000 m².

The GDW1000 is rated for up to 1000 m² of indoor coverage and up to 100 simultaneous users, which puts it in the large-home, light-commercial, shop, pub, restaurant, warehouse and small-office bracket rather than the small-flat bracket. It ships with an 8 dBi directional Yagi outdoor antenna, a 5 dBi panel indoor antenna, a 10 m low-loss outdoor coaxial cable, a 5 m low-loss indoor coaxial cable with N-type connectors, and an AC 100 to 240 V 50/60 Hz adapter stepping down to DC 5 V with a UK 3-pin plug. It delivers at least 60 dB uplink gain and at least 65 dB downlink gain on each of Band 8, Band 3 and Band 1, with maximum output power of at least 27 dBm. It carries UKCA and CE certification and operates under Ofcom's licence-exempt rules, so no frequency licence and no annual fee are required.

Before you drill a single hole, treat the install as a measurement job, not a wiring job. Every common failure reported to Boost4U support on a 1000 m² site is not an amplifier fault: it is a Yagi aimed at the wrong mast, a pair of antennas mounted too close together, a swapped BS and MS cable, an outdoor run left at 10 m when the building depth needs 30 or 40 m, or an outdoor signal that was never strong enough on one of the three bands. Working through the ten stages below in order avoids those mistakes, and the 30 to 60 minute estimate assumes you already own a screwdriver, a drill, a ladder and a phone in field-test mode.

Quick Answer: Can You Install the GDW1000 Yourself in 30 to 60 Minutes on a 1000 m² Site?

Yes. The GDW1000 is designed as a DIY licence-exempt repeater and the manufacturer quotes a 30 to 60 minute installation time for a single competent person, even at the 1000 m² rating, because wiring and mounting are the same physical steps as on a smaller unit; only the cable choice and zone testing take longer. The numbered facts below set the baseline before you touch the kit.

• Outdoor signal must be present on all three bands. A usable 2G reading sits between -76 and -90 dBm, a usable 3G reading between -80 and -94 dBm, and a usable 4G reading between -97 and -105 dBm. Read each band separately in field-test mode; a strong 2G bar on its own tells you nothing about 4G.
• Mount the 8 dBi Yagi 3 to 5 m above roofline or chimney height. That height clears garden foliage, neighbouring roofs, steel roof sheets and concrete walls that scatter the 900, 1800 and 2100 MHz waves across a large footprint.
• Maintain at least 10 m of vertical separation between the outdoor Yagi and the indoor panel. Less than that feeds the re-radiated signal back into the donor antenna and triggers oscillation protection on every band at once.
• Use the supplied 10 m outdoor cable and 5 m indoor cable as the starting point. Upgrade to 20, 30, 40 or 50 m low-loss outdoor cable only when the mast-facing mounting point cannot be reached with 10 m; at 1000 m² this upgrade decision matters more than on a small home.
• Plug the outdoor antenna into the BS port and the indoor antenna into the MS port. BS means base station (donor) and MS means mobile station (server); swapping the two produces no signal and can confuse the AGC across all three bands.
• Place the amplifier chassis near the geometric centre of the 1000 m² footprint so the single panel serves the hall, offices, shop floor and back room without stretching the 5 m indoor lead past its useful length.
• Wire both antennas first, then power on. Connect all N-type plugs, check the BS and MS labels, and only then plug the AC 100 to 240 V adapter into a UK mains socket.
• Watch the LED indicators for 3 to 5 minutes while the automatic gain control locks onto the donor signal on each band. A steady green band light means gain settled; a flashing amber light means oscillation or weak donor.
• Test every zone, not just the front office. Place a 2G voice call on O2 or Vodafone, run a 4G speed test on EE or Three, and check 3G fallback on Band 1, in the weakest corner of the 1000 m² footprint.
• Expand with an extra panel, not a second Yagi. Where one panel cannot reach a distant room, split the MS output with an N-type splitter; never split the BS donor side.

These ten points are the skeleton. The sections below expand each one into measurable steps, numbers and troubleshooting checks, and the comparison table later in this guide shows which optional upgrades are justified for a 1000 m² commercial building and which are marketing noise.

Step 0: Check the Outdoor Signal with dBm Readings Before Buying or Mounting

A repeater can only amplify what the donor antenna receives. If the Yagi position has no usable signal on a band, no amount of gain at ≥60 dB uplink and ≥65 dB downlink can manufacture that band out of nothing. The pre-install survey therefore happens before drilling, before ordering a cable upgrade, and before mounting the bracket. On a commercial site the survey also matters because the building often sits on a main road at the front but backs onto open fields at the rear, and the serving mast for each band can sit on a different side.

The three dBm ranges the GDW1000 expects at the Yagi

Walk the boundary of your property with the phone screen visible and read the received signal strength in field-test mode. The GDW1000 amplifies three independent services, so you must check three independent readings.

Interpret the numbers as a scale from strong to unusable. -76 dBm on 2G is a healthy, line-of-sight reading that the Yagi will turn into a loud indoor signal. -90 dBm on 2G is still comfortably workable and the amplifier adds ≥65 dB of downlink gain with margin to spare. -94 dBm on 3G sits at the edge of the recommended band but still produces a stable data session once amplified. -105 dBm on 4G LTE is the practical floor: below roughly -110 dBm the LTE receiver loses the control channel and the phone falls back to 3G or shows no service. The GDW1000's higher ≥65 dB downlink budget compared with a smaller unit absorbs more wall loss across 1000 m², but it cannot invent a donor band that the Yagi never receives.

How to read dBm rather than bars

Phone bars are subjective and differ between iPhone and Android; the dBm figure is the measurement the amplifier actually sees. On an iPhone, enter field-test mode from the dialler and watch the RSRP or RxLev value while standing still. On Android, use the engineering or network diagnostics menu under About Phone, or a free field-test app that lists serving-cell RSRP by band. Hold the phone away from your body, because a hand and head absorb 3 to 5 dB, and read the value on the roof-facing side of the building rather than the rear yard if the mast sits on the road side.

Where to survey: front, rear, sides and roof across a large site

Stand at the front pavement, the rear fence, each side wall, the loading bay, and the base of the chimney or proposed bracket position. Record all three readings at each spot. The strongest combined spot is where the Yagi goes. On many UK 1000 m² buildings the front pavement reads well on Band 8 but the side elevation reads better on Band 1 because a different mast serves that direction; the Yagi must point at the mast carrying your weakest band, not the nearest mast on the map. For a shop or office on a high street, the street-facing roof edge usually wins over the back yard, while a rural warehouse often reads best at the field-side gable.

Choosing the Yagi Mounting Spot: Height 3 to 5 m and Line of Sight

The 8 dBi Yagi is directional: it collects signal from a narrow forward beam and rejects signal from the sides and rear. Its usefulness depends on two geometric choices, the mounting height and the azimuth bearing, and both are set during the survey rather than after drilling. On a 1000 m² site the mounting point often decides whether you need a 10 m cable or a 40 m upgrade, so pick the bracket before you order cable length.

Mount 3 to 5 m above the roofline or chimney stack

The manufacturer recommends a mounting height of 3 to 5 m for the Yagi. At 3 m the antenna typically clears surrounding hedge lines, single-storey extensions, low rendered walls and parked commercial vehicles. At 5 m it clears two-storey neighbouring gables, mature tree canopies and steel roof ridges that scatter 2100 MHz most heavily, because higher frequencies lose more energy when foliage and metal cross the beam. A chimney bracket, fascia bracket, wall-mast or standalone pole all work; the deciding factor is whether the chosen point can hold the Yagi at that height with a rigid fixing and a clear downward cable entry.

Clear the beam path to the serving mast

A Yagi gains 8 dBi by focusing the forward beam, so anything inside that beam within 30 degrees to either side costs you gain. A 30-degree aim error itself costs 3 to 6 dB. Before drilling, trace the bearing from the survey app to the mast and confirm no tall tree, neighbouring chimney, gantry, solar panel array or metal tank sits inside the first 50 m of that path. If it does, move the bracket horizontally along the same wall until the beam clears, even if that means a slightly longer cable run; a clearer beam with a longer cheap cable beats a blocked beam with a short one.

Weatherproofing and fixing

The Yagi supplied with the GDW1000 is weatherproof, but the N-type connector at the cable entry is not. Seal the connector with the supplied weather boot or self-amalgamating tape, angle the connector pointing down so rainwater runs away rather than into the plug, and tighten the U-bolts firmly without over-torquing the aluminium elements. The unit's operating temperature range of -10°C to +55°C means outdoor mounting through winter frost and summer sun is normal, but the connector seal is what protects that rating year after year, especially on a commercial roof exposed to standing water.

Antenna Separation: Why 10 m Vertical Distance Prevents Oscillation Across 1000 m²

The single most important geometric rule in this install is the minimum 10 m separation between the outdoor donor Yagi and the indoor server panel. Oscillation, also called self-feedback, happens when the panel's re-radiated signal reaches the Yagi and the amplifier treats it as fresh donor signal, boosts it again, and feeds it round in an ever-rising loop until the stage overloads, distorts audio, wastes power and can raise the noise floor at the neighbour's cell. The GDW1000's ≥27 dBm output and ≥65 dB downlink gain make stable isolation more important, not less.

Why the rule is vertical and measured at 10 m

The GDW1000 spec sheet states a minimum antenna separation of 10 m, and the practical installation guidance treats it as a vertical distance where possible: mount the Yagi on the chimney or roof mast at roof height and the panel on an internal wall in the ground-floor centre of the building, so the floor slab, stair void and internal walls sit between the two. Vertical separation through a concrete floor slab costs far more isolation than horizontal separation across an open-plan hall, which is why a two-storey office block naturally meets the rule while a single-storey open warehouse of 1000 m² on one plane can struggle to.

What happens if separation is short

Below 10 m the per-band AGC can no longer hold the loop stable. The symptom is a flashing amber oscillation LED on the affected band, a hot amplifier chassis, muffled call audio, or a 4G speed that rises for a minute then collapses as the stage backs off. The fix is physical, not electronic: raise the Yagi, move the panel deeper into the building, or add an intervening solid wall. Software or gain dials cannot compensate for antennas radiating into each other, and the GDW1000 has no manual gain dial to crank anyway.

Typical 1000 m² layouts that pass the rule

A two-storey detached house of roughly 500 m² per floor passes easily with the Yagi on the front chimney and the panel on the rear landing wall. A retail shop of 1000 m² on one plane needs the panel at the centre of the sales floor and the Yagi on the street-facing roof edge 10 m away through the building depth. A steel-framed warehouse or office block uses the concrete slab and partition walls as the isolation layer; do not mount the panel on the same wall as the cable entry point, and do not place the panel directly behind the Yagi's roof wall even though 10 m feels like a large distance on paper.

Cable Routing: 10 m Outdoor + 5 m Indoor Coax and the 20/30/40/50 m Upgrade Ladder

The kit contains two separate low-loss coaxial cables with N-type connectors: 10 m for the outdoor donor run and 5 m for the indoor panel run. Keeping them separate matters because each connects to a different port, and the upgrade options apply to the outdoor run, not the indoor one. At 1000 m² the cable decision is the single most common upgrade question, because roof edge to equipment cupboard distances on commercial buildings routinely exceed the supplied 10 m.

The supplied 10 m outdoor cable

Ten metres reaches from a chimney or fascia bracket to the cable entry point on most two-storey buildings where the amplifier unit sits in the hallway, store room or under-stairs space. Route the cable along the eaves, down a drainpipe channel or through a soffit vent; avoid running it parallel to mains power leads, which injects 50 Hz hum, and cross power cables at 90 degrees where you must cross. Use a cable gland or rubber grommet at the drilled wall entry to keep weather out and the cable anchored, and on a commercial roof use UV-resistant clips rather than fixing the coax directly to metal purlins.

The supplied 5 m indoor cable

The 5 m indoor lead runs from the amplifier unit to the panel on the internal wall. Five metres covers a cupboard-to-central-wall distance in most layouts. Keep this run as short as possible: every extra metre of passive cable removes signal power from the panel without adding anything in return, and at ≥27 dBm output the indoor budget should reach the panel intact, not spend itself in a long indoor extension.

When to order the 20, 30, 40 or 50 m upgrade at 1000 m²

Order a longer low-loss outdoor cable only when the strongest donor spot cannot be reached with 10 m. The upgrade ladder runs 20 m, 30 m, 40 m and 50 m, and each additional 10 m segment costs roughly 2 dB of passive loss that the ≥60 dB uplink and ≥65 dB downlink gain budget absorbs but never gives back. A 20 m upgrade suits a large home where the Yagi faces a rear field from a side chimney and the unit sits at the front; 30 m suits a long shop, farmhouse or workshop; 40 m suits a pole-mounted Yagi at a field edge feeding a separate office annex; 50 m reserves for the maximum-reach rural site. Do not over-order: measure the route along the eaves and downpipe, not in a straight line on the map, because cable runs follow walls and corners.

Every upgrade length ships as the same N-type low-loss coax with weatherproof connectors, so splicing the included 10 m into a longer run is unnecessary and an unsoldered joint between cables costs more loss than a single continuous upgrade. If you also add the optional lightning surge protector on the outdoor run, place it as close to the cable entry point as practical, because a roof-mounted Yagi on a commercial building is a taller lightning target than a domestic chimney.

BS and MS Ports: Which Antenna Plugs Into Which Socket

The GDW1000 chassis carries two labelled N-type sockets. BS stands for base station port, the donor input that faces the outdoor Yagi. MS stands for mobile station port, the server output that faces the indoor panel. Getting this pair right is a two-second check but a swapped pair is the third most common support ticket after poor aim and short separation, and at 1000 m² a swapped pair wastes an afternoon of wall routing before the mistake shows.

BS (base station) = outdoor Yagi

Connect the outdoor cable running from the Yagi to the BS socket, whether that run is the included 10 m or a 20, 30, 40 or 50 m upgrade. This is the input that listens to the serving mast. The amplifier's ≥60 dB uplink gain stage takes the phone's faint transmit signal, boosts it through this same path back toward the tower, and the ≥65 dB downlink stage boosts the tower's incoming signal out through the MS side.

MS (mobile station) = indoor panel

Connect the 5 m indoor cable running to the 5 dBi panel to the MS socket. This is the output that re-radiates the cleaned signal to phones inside the building, covering up to 1000 m² through even gain distribution. Plugging the panel into BS and the Yagi into MS reverses the direction of the amplifier: no indoor coverage appears, the AGC sees nothing to lock onto, and the LEDs sit dark or flash without heating up.

Connector habit

Hand-tighten each N-type plug clockwise, then turn a further quarter turn with a spanner or pliers wrapped in cloth. Do not overtighten: an N-type seal does not need wrench force, and crushed threads leak signal on all three bands at once. Check the label on the socket after tightening, not before, because the two sockets sit close together on the rear panel, and label the cable with a tie-on tag at both ends so future maintenance never swaps them.

Power-On Sequence and the AGC Warm-Up Period

Wiring order matters on a repeater because an amplifier powered up with no load on its ports can drive unused ports into reflection, and powering on before antennas are connected gives the AGC a misleading starting point. The safe sequence below takes about five minutes and applies identically whether you fit the standard kit or a 40 m cable upgrade.

• Mount the Yagi and run the outdoor cable to the BS port; tighten and label the connector.
• Mount the panel and run the 5 m indoor cable to the MS port; check the label once more.
• Confirm 10 m separation between antennas and check no metal object, shelving rack or vending machine sits within 30 cm of the panel face.
• Leave the AC adapter unplugged until both cables are fully seated and every zone cable route is clipped down.
• Plug the AC 100 to 240 V 50/60 Hz adapter into a UK mains socket with a UK 3-pin plug; the unit converts to DC 5 V internally.
• Wait 3 to 5 minutes for the per-band automatic gain control to lock onto the donor cells on Band 8, Band 3 and Band 1.
• Read the LEDs before moving the Yagi; only re-aim if a band light stays dark or flashing amber.

The AGC warm-up is not a cosmetic pause. On first power the amplifier scans the donor spectrum, picks the strongest serving cell per band, calculates isolation against its own re-radiation, and settles gain levels that keep output at or below the ≥27 dBm maximum without oscillation. Interrupting that scan by unplugging and replugging mid-warm-up forces it to restart, which is why the wait should be observed once, not repeatedly.

Why not power on first?

Some installers plug the adapter in to test the LED before connecting antennas. That habit finds the unit alive but gives the AGC an empty port to chase, and on the next real connection the control loop can sit at an extreme gain setting until a manual cycle clears it. The seven-step sequence avoids that reset every time. On a commercial site where staff keep phones nearby, also power the unit on after hours so the first AGC scan is not confused by a room full of active handsets attaching immediately.

LED Indicators: What Each Light Means During Setup

The GDW1000 uses per-band status LEDs rather than a smartphone app, and reading them correctly replaces the need for constant field-test checks during the warm-up. The lights split into power, donor signal and oscillation categories, and the same logic applies to all three tuned bands.

Because the three bands share one antenna pair, oscillation on one band often perturbs the neighbour band's LED as the AGC rebalances. Fix the flashing band first, wait another three minutes, and re-read the others rather than chasing three lights at once. On a commercial site with mains noise nearby, a dim band that stays dim despite good outdoor readings can also indicate the coax run parallel to a heavy power circuit; reroute that section at 90 degrees and restart the scan.

Multi-Room Testing: Calls, 4G Speed and 3G Fallback Across 1000 m²

Coverage is only proven inside the building, not on the LED panel. After the warm-up settles, walk the 1000 m² footprint with phones on every network present in the building and check three services in the weakest room, which is usually the rear store room, the top-floor office above the stairwell, the warehouse far corner, or the function room at the end of a long hall.

Voice test on Band 8

On an O2 or Vodafone SIM, place a two-minute call from the weakest room to a landline or a second phone and listen for muffling, echo or sudden drops. A boosted Band 8 link should hold four bars of signal with clear audio throughout; dropped audio that appears only while walking near a window suggests the phone is falling back between boosted and unboosted cells, a tuning matter rather than a fault. For a pub or office, repeat the call from the cellar and the upstairs meeting room, because those are the two spots guests and staff call from most.

4G speed test on Band 3

On an EE or Three SIM, run a speed test in the same room and record download, upload and ping. With a donor reading between -97 and -105 dBm at the Yagi, expect a stable LTE link rather than gigabit speed; the goal is a usable session that loads card terminals, video calls and email attachments, not a competitive broadband benchmark. Walk each zone once after the test so the booster does not get blamed for a weak donor reading that was never in the workable range.

3G fallback test on Band 1

Force or wait for a Band 1 session on any network and confirm data loads when 4G is congested. This matters in rural commercial buildings where Band 1 remains the only data layer after the 4G crowd clears, and it keeps a card terminal or booking page alive when the EE or Three LTE cell is full at peak trading.

Tools, Materials and the 30 to 60 Minute Timeline

The manufacturer's 30 to 60 minute estimate assumes a standard two-storey large home or single-floor shop, no ladder work above first-floor gutter level, and the tools below already on site. Extra time on a 1000 m² site goes to surveying across the whole boundary and aiming; the wiring itself is the shortest phase.

Extra items worth having on site: a weather boot or self-amalgamating tape for the outdoor N-type connector, a ladder or scaffold platform rated to the working height, cable ties rather than nails through the coax, a cable length measure before ordering the upgrade, and a second pair of hands for the roofline bracket. Listed buildings, conservation areas and commercial leaseholds deserve a quick planning or landlord check for any external antenna, but a single domestic or small-business Yagi under permitted development rules rarely needs consent in England and Wales.

Comparison Table: Standard Kit vs Optional Upgrades for a 1000 m² Site

The table below compares what ships in the box against the paid options, so you order what the building actually needs rather than every accessory at checkout. At 1000 m² the two justified upgrades are the cable length for a distant bracket and a second indoor panel for a separated zone.

Expanding Coverage: Extra Indoor Antennas for a Multi-Room 1000 m² Site and 100 Users

The GDW1000 is rated for 1000 m² and up to 100 simultaneous users, and the single 5 dBi panel covers that footprint when the amplifier sits centrally. Some 1000 m² layouts, however, split into zones that one panel cannot reach evenly: a main shop plus a detached store room, a two-storey block plus a steel workshop, a long office hall where one panel sits at the end rather than the middle, or a home with separate annex and outbuilding.

When a second panel helps

Add an extra indoor panel through an N-type splitter on the MS output when the weak room sits more than about 12 to 15 m from the first panel and two solid walls away from it. The amplifier's ≥27 dBm output budget supports a modest split across two radiating points without collapsing either signal; the splitter costs 3 to 5 dB of shared power, which the ≥65 dB downlink margin absorbs for two panels but not for three or more. For a genuinely split campus with buildings tens of metres apart, a second booster unit rather than a long splitter run is the correct answer.

User load of 100 simultaneous connections

The 100-user rating counts active phone sessions on the boosted cell, not registered devices. A large family of eight and a small office of twenty staff use only a fraction of that headroom; a busy showroom, conference event or retail floor pushing close to 100 concurrent calls approaches the ceiling and should rely on the main network beyond it. The unit is not a stadium or distributed antenna system and the 100-user rating should not be overstated in planning a public venue.

Do not split the outdoor side

Extra indoor panels split the MS output, never the BS input. Two Yagis on the donor side feed two different cells and invite oscillation and confusion in the AGC, so expansion on the outdoor side means a longer or higher-gain cable and better aim, not a second donor antenna. This rule holds even on a 1000 m² site where it is tempting to bolt a second Yagi to each wing.

Common Installation Faults and Fixes on a 1000 m² Site

Fault 2: Flashing amber oscillation LED. Increase vertical separation, move the panel deeper inside, or reposition an intervening wall. Do not attempt to lower output manually; the AGC already sits at the Ofcom-legal ceiling of ≥27 dBm output and the only real fix is geometry.

Fault 3: One distant zone stays at zero bars. Measure the distance and wall count from the panel. Beyond 12 to 15 m through two walls, add a second panel on the MS output rather than re-aiming the Yagi, because the donor side was never the problem in that room.

Fault 4: Call audio muffled despite steady green LEDs. Look for the panel mounted behind foil-backed plasterboard, inside a metal cupboard, or behind a steel shelving rack; move it to a plain internal wall with 30 cm of clear space in front.

Fault 5: 4G speed rises then drops a minute after testing. Classic oscillation loop. Power off, increase separation, and restart the three-minute AGC scan from a clean state rather than chasing the gain setting.

Fault 6: Connector corrosion on the outdoor plug. The weather boot was omitted or the connector faced upward. Reseat with fresh self-amalgamating tape and angle the plug downward so water drains away, particularly on an exposed commercial roof.

Fault 7: The 10 m included cable falls short of the bracket. Do not splice or stretch; order the measured 20, 30, 40 or 50 m continuous low-loss upgrade, because a joined run loses more signal than a single clean length.

Frequently Asked Questions