Anatomy of a Radio System BOM: What Belongs on the Line, What Should Be Optional
A lump-sum "complete system" price hides the two questions that decide whether the system works: what is actually in the box, and what was quietly left out. A line-by-line BOM answers both. Here is the structure to demand, which lines are conditional, and the ones that only exist when a repeater does.
| Specification | Always required?.. | What it covers.. |
|---|---|---|
| Line | Always required? | What it covers and why it is there |
| Handheld radios | Yes | One per on-shift position, plus spares; the quantity driver is roles and groups, not headcount |
| Batteries and chargers | Yes | Usually one charger per radio or a multi-bay per crew room; spare batteries on shift work |
| Vehicle mobiles | Conditional | Only where people work from vehicles; a handheld in a cab is a bad experience, not a coverage problem |
| Repeater | Conditional | Only when users cannot reach each other directly; it changes the licence position too |
| Duplexer and cabinet | Only with a repeater | Combines transmit and receive onto one antenna; quoting a repeater without it is an incomplete line |
| Antenna, feeder and mounting | Only with a repeater | Height and cable loss usually matter more than transmit power; the feeder length is a real cost line |
| Power and backup | Conditional | Mains, UPS or battery backup depends on whether the site has reliable power at the repeater position |
| Programming and configuration | Yes | Loaded to your frequency plan and talk groups before dispatch; state who supplies the plan |
| Spares | Recommended | Typically 10-15% of handheld quantity on shift-critical sites; a stated percentage, not a hidden buffer |
| Frequency licence | Not supplied | The assignment stays with the operator; the BOM can state the band, not obtain the licence |
BOM Structure
A BOM exists to make three things visible: what each line costs, why it is there, and what happens if it is removed. A single figure for a complete system defeats all three. The most common failure is a repeater quoted without its duplexer, antenna or feeder, which reads as a cheaper system until installation day, when the missing hardware arrives as an extra invoice. The second most common is spares folded invisibly into the radio count, so the buyer believes they are buying 40 working positions and receives 34 plus six boxes in a store. Neither is fraud; both are what happens when a quote is assembled as a package instead of as a configuration. Demand one line per item, a quantity, and a one-sentence reason. If a supplier cannot give the reason, the line is either unnecessary or not understood.
Quotation Review
Two structural checks are worth doing before comparing prices. First, separate mandatory from conditional: handhelds, chargers, programming and spares are mandatory for any project; vehicle mobiles, repeaters, duplexers, antennas, power backup and hazardous-area variants are conditional on the site, and each should carry the condition that triggered it. Second, check that the conditional items are internally consistent - a repeater with no duplexer, an antenna with no feeder length, a hazardous-area handheld with standard batteries. Inconsistency across lines is the strongest signal that the quote was copied rather than designed. Ask also for the programming scope in writing: whose frequency plan, which talk groups, whether emergency behaviour and lone-worker settings are included, and what happens if the plan changes after dispatch. That last item is where a cheap quote becomes an expensive relationship.
Data Source: Structure derived from the RadioSysHub catalogue (60 models across five form factors) and the deliverable list published on /systems. No prices are asserted: quantities and scope depend on the site and the destination.
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