Answer first: the CD2000 is a self-contained dual-band licence-exempt enterprise repeater that an owner, facilities manager or installer can deploy without an RF contractor, a drilled roof panel, or a paid frequency licence, because a 2000 m2 footprint starts with one outdoor omni, one or more indoor server antennas, a 10 m outdoor cable, a 5 m indoor cable and a standard UK mains socket, with up to ten indoor antennas added for separate enterprise zones. The whole job breaks into ten factual stages: (1) confirm a usable outdoor 4G reading on your network's band, between -97 and -105 dBm, plus a usable 2G voice reading where calls matter; (2) choose a window, fascia or roof mounting point for the 5 dBi omni at 3 to 5 m height with a clear path to the serving mast; (3) keep the outdoor omni and every indoor antenna at least 10 m apart vertically; (4) connect the included 10 m outdoor coax to the BS base-station donor port; (5) connect the included 5 m indoor coax to the MS mobile-station server port; (6) extend the outdoor run to 20, 30, 40 or 50 m only when the chosen point cannot be reached with 10 m; (7) plan up to ten indoor antennas across the zones rather than trusting one whip to cover 2000 m2; (8) connect every antenna first, then power on through the AC 100-240 V to DC 5 V adapter into a UK mains socket; (9) read the LED indicators for 3 to 5 minutes while the automatic gain control locks onto the donor cells; (10) test a voice call and a 4G speed session in each zone before calling the job finished.

CD2000 Snapshot Before You Touch a Screw

The CD2000 is rated for up to 2000 m2 (21,528 ft2) of indoor coverage across a large office, multi-floor corporate building, hotel or resort, warehouse, factory unit, logistics centre, supermarket, large retail floor, or rural estate, and for up to 200 simultaneous active phones. It ships with a 5 dBi omni-directional outdoor antenna, a 3 dBi whip indoor antenna, a 10 m low-loss outdoor coaxial cable, a 5 m low-loss indoor coaxial cable, 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 70 dB uplink gain and at least 75 dB downlink gain on both Band 20 (800 MHz) and Band 3 (1800 MHz), with a maximum output power of at least 27 dBm, and a noise figure of no more than 5 dB. It supports up to ten indoor antennas for zone-by-zone enterprise coverage, holds UKCA, CE and RoHS certification and Ofcom licence-exempt mobile-repeater status, and needs no frequency licence, annual fee or formal installer sign-off.

The dBm ranges the CD2000 expects at the outdoor antenna

Walk the boundary of your property with the phone screen visible and read the received signal strength in field-test mode. The CD2000 amplifies two independent services, Band 20 4G plus Band 3 4G and 2G voice, so read the band your network actually uses rather than trust the subjective bar count on the home screen.

-97 dBm on 4G is a healthy reading the omni turns into a loud indoor signal once the >=75 dB downlink stage and the >=27 dBm output restore wall, concrete and metal loss. -105 dBm on 4G sits at the edge of the recommended band but still produces a stable LTE session once amplified, because the enterprise output and gain margin absorb plasterboard, brick, double-glazing, floor slabs, warehouse racking and a factory concrete shell more comfortably than a mid-size unit. -112 dBm on 4G is the practical floor: below roughly -112 dBm the LTE receiver loses the control channel, the phone falls back to a slower service or shows no service, and no booster can manufacture a donor the outdoor antenna never receives. The >=70/75 dB gain and >=27 dBm output recover a weak donor better than a mid-size chassis, but they cannot invent a band the survey never picked up.

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 dialer and watch the RSRP value while standing still, then move around with the screen visible. On Android, use the engineering or network diagnostics menu under About Phone, or a free field-test app that lists 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 road-facing side rather than the rear yard if the mast sits on the road side.

Where to survey: front, rear, sides, upper floors and each facade

Stand at the main entrance, the rear yard fence, each side wall, the upper guest floor or mezzanine, the workshop bay, and at the proposed window or fascia position. Record the reading at each spot for your own SIM and two colleagues' SIMs on different networks, because the strongest combined spot is where the omni goes. On a rural estate the field-side gable usually beats the wall sheltered by a hedge or stable block; on a high-street hotel or supermarket, survey the street-facing door and front window during trading hours, because interior shelving, lifts, chilled units and stocked racks absorb signal even though the tower itself does not move.

Survey warning: if your band reads below -112 dBm at every outdoor position on your land, the CD2000 cannot manufacture that band indoors. You may still improve voice on the other network's service, but the missing band stays missing. In that case raise the mounting point, add height, or aim the high-gain aerial supplied with full kits directly at the serving mast rather than driving twice.

Why 3 to 5 m height matters across 2000 m2

The omni should sit at 3 to 5 m above ground level on a wall bracket, drainpipe clip, fascia rail, low roof edge or chimney stack side, whichever gives the shortest clean run back to the chassis. Three metres clears fences, parked lorries and hedge tops; five metres lifts the antenna above a single-storey extension, a flat warehouse roof or a function room where a ground-level window reads weak. Extra height helps only up to the point the donor becomes visible; beyond that the cable route back grows longer and adds passive loss without changing the received band.

Window frame, fascia bracket, drainpipe or roof edge

A window-frame bracket suits a rented or listed wing where drilling is limited; a fascia bracket suits a shop or hotel frontage; a drainpipe clip suits a party wall; a roof edge or side gable suits a rural estate and factory. Keep the omni away from metal guttering, satellite dishes, air-con units, steel chimney pots and lift shafts by half a metre or more, because a metal object within the near field absorbs the 5 dBi pickup.

What to avoid at the mounting point

Do not mount the omni inside a sealed metal box, behind a solid stone chimney breast, under a tiled roof overhang that blocks the horizon, or on the rear wall facing a solid yard or stock wall when the mast sits on the road side. Do not let tree leaves grow within a foot of the antenna at summer fullness, because deciduous canopy at 800 MHz still removes several dB.

Why vertical beats horizontal separation on a large site

UK building geometry usually provides vertical separation cheaply: the omni on the front first-floor fascia and an indoor antenna on the ground-floor reception naturally sit more than 10 m apart through the floors. On a single-storey warehouse where vertical distance cannot reach 10 m, place the omni at one extreme end and the server antennas at the far opposite ends, route the donor toward the street, and keep racking and steel shelving between them.

What enterprise output means for the separation rule

A higher transmit output makes feedback slightly easier to trigger, so the 10 m separation rule is not relaxed despite the >=27 dBm output and the >=75 dB gain. Point every indoor antenna toward its own zone, never back toward the omni, and never mount two on the same elevation within a few metres. If a band LED begins to flash rapidly during the AGC warm-up, separation is the first suspect, followed by a reversed BS/MS port or an indoor antenna placed too near the donor.

The 10 m outdoor cable goes to the BS port

BS stands for base station donor: this port faces the outdoor omni and carries the weak tower signal into the amplifier. The included 10 m outdoor coax runs from the omni down the wall, through a drainpipe or under a window sill, and into the chassis BS socket. Only the outdoor run is ever extended, because the outdoor antenna distance from the building varies; the indoor server distance is fixed per antenna zone.

The 5 m indoor cable goes to the MS port

MS stands for mobile station server: this port faces the indoor antennas and carries the amplified signal out to the users. The included 5 m indoor coax leads from the chassis MS socket to the first whip. Keep each indoor lead short rather than daisy-chaining one extremely long cable to a distant zone, because every extra metre of passive indoor cable removes radiated field without reaching the users efficiently; the upgrade ladder applies to the outdoor donor run.

BS and MS labels and swapping them

Swapping the two produces no coverage: the weak donor signal would be sent to the whip as if it were output, and the amplified output would be fed back toward the omni. The chassis and connectors are labelled on the unit itself; match the cable from the omni to BS and the cable to the server antenna to MS before tightening the adapters.

20, 30, 40 and 50 m outdoor upgrades

Every extra 10 m of outdoor coax costs roughly 2 dB of passive loss that the >=70 dB uplink and >=75 dB downlink budget absorbs but never returns. Measure the physical route along the wall, downpipe and corners, not the straight-line map distance, and buy the length that matches rather than the longest available.

How to divide a 2000 m2 site into antenna zones

Walk the floor plan and split it into natural sections: reception and open-plan desks, meeting rooms, the guest-room floors, the warehouse sales floor and stock mezzanine, the bar and dining extension, the workshop bays, the retail aisles, and any separate annex. Place one server antenna in the centre of each section, keep each lead short, and keep every antenna 10 m clear of the outdoor omni. A single large floor may use three or four; a multi-floor hotel, warehouse or office uses up to ten.

Where the antennas sit across ten zones

Antenna one covers reception and the ground-floor desk cluster; antenna two covers the meeting or dining wing; antenna three covers the upper guest floor or mezzanine; antenna four covers the stock room, warehouse racking or workshop bay; antennas five to ten cover additional floors, the retail aisles, the annex, the function room and the yard-facing office. Each radiates vertically upright through open ceiling space rather than inside a metal cabinet or lift shaft, and each points toward its zone's users, never back toward the donor omni.

Why placement beats a long daisy-chained indoor cable

If a distant zone stays weak after the first placement, the answer is another server antenna in that zone, not one long indoor lead stretched from the chassis. Daisy-chained cable steals field from every antenna on the line and accumulates passive loss; the enterprise output still expects short, direct indoor runs to each zone.

3 to 5 minute automatic gain control

After power on, the CD2000 runs a 3 to 5 minute automatic gain control routine that listens for the donor cells on Band 20 and Band 3 and sets stable gain on both bands. During this window the LEDs settle rather than reach final brightness; do not adjust cables or unplug during the warm-up, especially on a multi-antenna site where the AGC balances all server points at once.

Reading the LEDs

A steady green band light means the band donor is locked and stable. A flashing band light means the donor is weak, the band is searching, or the unit is backing off from feedback. A rapidly flickering light across both bands points to separation too close, a reversed port, or an indoor antenna placed too near the omni. After 5 minutes, confirm a steady green on the band your network uses before starting the zone test.

How >=70/75dB gain and >=27dBm output interact with AGC

The automatic gain control balances recovered donor signal against the rated >=27 dBm output so a strong donor backs off automatically and a faint donor is recovered fully; the >=70/75 dB rating describes amplification of the weak donor, and >=27 dBm describes the enterprise transmit level reached after that balance. The two work together rather than fighting, so the unit never overshoots into interference or oscillation even across a 2000 m2 building.

What success looks like

A steady 3 to 4 bars and a clear call in the furthest guest room, stock corner, retail aisle or workshop bay proves the >=27 dBm output and >=75 dB downlink margin carried the signal through concrete, brick, floor slabs, metal racking and a shop counter. Test two or three SIMs on different networks too, because the dual-band chassis carries O2, Vodafone and Three on Band 20 and EE family on Band 3; a mixed-carrier office, hotel or shop needs both bands locked.

What a weak zone means

A zone stuck at zero bars after the walk needs an added or moved server antenna rather than a re-aimed omni, because the donor side was never the problem there. A whole band absent on the LEDs points back to the outdoor survey rather than indoor placement.

Think of gain as the microphone's sensitivity and output as the loudspeaker's volume. The CD1000 already listens at >=70/75 dB and fills 1000 m2 at >=20 dBm; the CD2000 keeps the same sensitive microphone but raises the loudspeaker by 7 dB, about five times the power, so the field reaches a second floor, a far warehouse bay, the retail aisles and the annex, and supports twice as many active phones across ten zone antennas. The <=5 dB noise figure stays the same, so the louder field arrives legible rather than noisier.

Where the extra seven decibels go across the 2000 m2

Every indoor surface costs signal: plasterboard partitions cost a few dB, an external brick wall costs 10 to 20 dB, a concrete or steel warehouse wall costs more, a ceiling slab between levels adds its own loss, and metal racking, chilled units or machinery add attenuation on top. The extra 7 dB of output absorbs that cumulative loss at the far edge of the site, while the >=75 dB gain keeps the recovered donor clean at the source. The combination, spread across up to ten zone antennas, is what covers 2000 m2 for 200 sessions where the CD1000's >=20 dBm runs dry around 1000 m2.

More output does not remove the donor survey or the separation rule

Higher transmit power reaches farther through structure but still cannot create a band the outdoor antenna never received, and the 10 m separation still applies because a louder field feeds back more readily. The extra 7 dB stretches an already-amplified signal across a larger building; it does not substitute for a healthy donor or replace correct antenna zoning.

Choose the aimed high-gain aerial when no indoor zone reaches but the outdoor reading is poor; choose a second larger-rated unit when the outdoor signal is healthy but the area clearly exceeds 2000 m2; never solve an oversized footprint with a longer cable or a louder chassis. The aerial is a donor-side fix, the second unit is a geometry fix, and the >=27 dBm output plus ten zone antennas is what carries a good donor across the existing 2000 m2.

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