Pier stakes · three legs, 3.4 m face
GNSS base · pier positions
Survey drone · terrain model
25.2 m · lattice to 18 m, straight above
Radios and backhaul
Lines swept, links proven
Three sectors in service
Radios swapped · steel stays
Footprint restored · piers removed below grade
Crew truck
Survey · year 0
Year 20 · removal
Year 0 · in service
Needs 1.8 m
Ground · 6.5 m below the feet
Stock 3 · covers 95 % of lead times
Fleet · red units are down
Failures in one lead time · Poisson
Fibre to the hub
Cabinet · sweep and power
Lattice steel · recycle
Concrete piers · recycle
LFP battery packs · recycle
Equipment cabinet · reuse
Hybrid trunk cable · recycle
Radios · reuse
Depot · 1,523 m, valley floor
Depot
Crew truck
Site A · 2,727 m
Site B · 2,636 m
Site C · 2,520 m
Intro.
Field services · Explainer
A remote site is built, proven, kept running and finally taken away by people in trucks and on ladders. Seven steps of that work, each worked live: the lifecycle, the crew’s route, the radio survey, the climb, the acceptance test, the spares that keep a fleet running and the ledger that closes the site. Every number below is computed live from your inputs.
01 · Site lifecycle
Survey fixes where the foundations go and what the ground will carry. Design turns that into drawings and a structural check. Install and commission happen in weeks; operation lasts as long as the structure and the power hold, broken by planned refurbishments; decommissioning returns the ground. Planned attendances are the three build visits, the preventive visits over the service life, each refurbishment and the final removal.
Stage
Survey: a GNSS base fixes the pier positions to the centimetre, a drone flies the parcel for a terrain model and test pits tell the designer what the ground will bear.
02 · Crew route
On the Bow Valley elevation model the route is a least-cost path from the valley-floor depot: each step costs its surface length weighted by 1 + 10g², where g is the grade, and steps steeper than the limit are not allowed. Lower the limit and the route lengthens, switches back or stops short of the ridge.
Site
Average speed
03 · RF survey along the route
The survey walks the access route and predicts the signal from the mast at every step. Free-space loss is 20 log10(d km) + 20 log10(f MHz) + 32.44 dB. Each path is checked against the terrain with the Earth bulge for k = 4/3; where a ridge cuts into Fresnel zone 1, the worst obstacle is treated as a knife edge, ν = h√(2(d₁+d₂)/(λd₁d₂)), with loss 6.9 + 20 log10(√((ν−0.1)²+1) + ν − 0.1) dB. Points below −100 dBm turn red.
Frequency
04 · Tower climb
Clearance needed below the feet is the free fall, plus the arrest distance, plus about 0.3 m of harness stretch and D-ring shift, plus a 0.6 m margin. The runner on a rigid ladder rail lets the climber drop about 0.3 m and stops within about 0.6 m. A 1.8 m energy-absorbing lanyard falls its own length plus the drop from anchor to D-ring, about 1.5 m above the feet, and its absorber may extend up to about 1.2 m. Low on the ladder, or just above a platform, a lanyard tied at the feet cannot stop a fall in time.
Fall-arrest system
05 · Acceptance test
The antenna line is swept for reflections: with reflection coefficient Γ = (VSWR − 1)/(VSWR + 1), return loss is −20 log10Γ and mismatch loss is −10 log10(1 − Γ²); the line passes at 14 dB of return loss or better. The fibre passes when the optic’s power budget exceeds 0.35 dB/km at 1310 nm, two connectors at 0.5 dB, a splice every 2 km at 0.1 dB and a 3 dB repair margin.
Optic power budget
Run the test
06 · Repair time and spares
A fleet of N units with mean time between failures MTBF fails N · 8760 / MTBF times a year. One unit is available MTBF / (MTBF + MTTR) of the time. Failures in a resupply lead time follow a Poisson distribution with mean N · lead time / MTBF, so the spares to hold are the smallest stock whose cumulative probability reaches the service level. Each bar in the scene is one stock level.
Service level
07 · Decommission ledger
The ledger weighs what comes down by class figures: about 120 kg of lattice steel per metre of a light three-leg tower, concrete piers at 2.4 t/m³ for three Ø1.0 m × 3 m piers, lithium iron phosphate packs at about 7 kg per kWh, 150 kg per equipment cabinet, and hybrid trunk cable at 0.6 kg per metre for six runs up the tower. Choose each line’s destination; the diversion rate is reused plus recycled mass over total mass. Each block in the scene is half a tonne.
A remote site is built, proven, kept running and finally taken away by people in trucks and on ladders. Seven steps of that work, each worked live: the lifecycle, the crew’s route, the radio survey, the climb, the acceptance test, the spares that keep a fleet running and the ledger that closes the site. Every number below is computed live from your inputs.
Survey fixes where the foundations go and what the ground will carry. Design turns that into drawings and a structural check. Install and commission happen in weeks; operation lasts as long as the structure and the power hold, broken by planned refurbishments; decommissioning returns the ground. Planned attendances are the three build visits, the preventive visits over the service life, each refurbishment and the final removal.
On the Bow Valley elevation model the route is a least-cost path from the valley-floor depot: each step costs its surface length weighted by 1 + 10g², where g is the grade, and steps steeper than the limit are not allowed. Lower the limit and the route lengthens, switches back or stops short of the ridge.
The survey walks the access route and predicts the signal from the mast at every step. Free-space loss is 20 log10(d km) + 20 log10(f MHz) + 32.44 dB. Each path is checked against the terrain with the Earth bulge for k = 4/3; where a ridge cuts into Fresnel zone 1, the worst obstacle is treated as a knife edge, ν = h√(2(d₁+d₂)/(λd₁d₂)), with loss 6.9 + 20 log10(√((ν−0.1)²+1) + ν − 0.1) dB. Points below −100 dBm turn red.
Clearance needed below the feet is the free fall, plus the arrest distance, plus about 0.3 m of harness stretch and D-ring shift, plus a 0.6 m margin. The runner on a rigid ladder rail lets the climber drop about 0.3 m and stops within about 0.6 m. A 1.8 m energy-absorbing lanyard falls its own length plus the drop from anchor to D-ring, about 1.5 m above the feet, and its absorber may extend up to about 1.2 m. Low on the ladder, or just above a platform, a lanyard tied at the feet cannot stop a fall in time.
The antenna line is swept for reflections: with reflection coefficient Γ = (VSWR − 1)/(VSWR + 1), return loss is −20 log10Γ and mismatch loss is −10 log10(1 − Γ²); the line passes at 14 dB of return loss or better. The fibre passes when the optic’s power budget exceeds 0.35 dB/km at 1310 nm, two connectors at 0.5 dB, a splice every 2 km at 0.1 dB and a 3 dB repair margin.
A fleet of N units with mean time between failures MTBF fails N · 8760 / MTBF times a year. One unit is available MTBF / (MTBF + MTTR) of the time. Failures in a resupply lead time follow a Poisson distribution with mean N · lead time / MTBF, so the spares to hold are the smallest stock whose cumulative probability reaches the service level. Each bar in the scene is one stock level.
The ledger weighs what comes down by class figures: about 120 kg of lattice steel per metre of a light three-leg tower, concrete piers at 2.4 t/m³ for three Ø1.0 m × 3 m piers, lithium iron phosphate packs at about 7 kg per kWh, 150 kg per equipment cabinet, and hybrid trunk cable at 0.6 kg per metre for six runs up the tower. Choose each line’s destination; the diversion rate is reused plus recycled mass over total mass. Each block in the scene is half a tonne.
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