Published on 10/13/2026
A buyer receives two quotes for what looks like "a one meter SMA cable." One is Rs.200. The other is Rs.20,000. Neither supplier is lying, and neither is necessarily overcharging. They are quoting different cables that happen to share a name.
Cost in an RF assembly is driven by a handful of things: the connectors, the cable, the labor to prepare and terminate it, how much testing it gets, the quantity, and what customization it carries. Each one can move the price by a factor of two to ten.
This guide breaks those drivers down with ranges, shows where the money goes in a low-cost and a high-end assembly, and lists practical ways to lower cost without lowering performance. The figures are illustrative ranges, not a SigmaRF price list; ask for a quote for exact pricing. See also our RFQ checklist for what to specify.
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| Driver | Rs.200 class assembly | Rs.20,000 class assembly |
|---|---|---|
| Application | Consumer antenna pigtail, indoor, up to about 3 GHz | Test and measurement or defense link to 26 GHz or 40 GHz |
| Connectors | Standard nickel-plated SMA, crimp | Precision stainless 2.92 mm or 3.5 mm, captivated contacts |
| Cable | RG174 or RG316, standard jacket | Semi-rigid, low-loss phase-stable or armored cable |
| Test | Continuity or sample check | Full VNA sweep, data report, phase matching |
| Tolerance | Plus or minus 10 mm or more | Plus or minus 1 mm length, plus or minus 2 degrees phase |
| Volume | Thousands | One to ten pieces |
| Cost driver | How it moves price | Typical effect |
|---|---|---|
| Connector series and grade | SMA is low cost. N, TNC and 7/16 DIN cost more. 2.92 mm, 2.4 mm and 1.85 mm cost the most | Can be 5x to 20x between SMA and 2.4 mm |
| Cable type | RG174 and RG316 are inexpensive. Low-loss, semi-rigid and phase-stable cost more | 2x to 10x |
| Length | Material and handling grow with length, loss grows too so thicker cable may be needed | Roughly linear plus cable upgrade |
| Plating | Gold and stainless cost more than nickel | 1.2x to 2x on connectors |
| Test scope | Continuity is cheap. A VNA sweep to 18 GHz or 40 GHz takes more time and equipment | Adds per-unit labor |
| Phase matching | Each cable is measured and trimmed | Often 1.5x to 3x |
| Tolerance | Tight length tolerance needs extra trimming | Adds labor |
| Customization | Special marking, boots, overmold, drawings, packaging | Fixed NRE plus per-unit cost |
| Quantity | Setup and test programming are spread over more units | Falls steeply from 1 to 100 pieces |
The shape matters more than the figures: in a precision assembly the connectors and the test are most of the cost, while in a commodity jumper the cable and labor dominate.
Savings checklist
The unit price is not the whole cost. A cable that fails intermittently can cost days of engineering time and, in a deployed system, a site visit. Matching the assembly to the application, and verifying it on a VNA, reduces total cost even when the unit price is higher.
Connector seriesCable typeLengthTest depthPhase matchingQuantityPlatingCustomization
Why are RF cable assemblies so expensive?
Precision connectors, specialized cable, hand terminations and VNA testing add cost. The price rises steeply with frequency and tolerance.
What is the price of an SMA cable assembly?
A simple SMA assembly in RG316 can cost a few hundred rupees in volume. Precision SMA to 18 GHz assemblies cost several times more. Ask for a quote for exact pricing.
Why does a 2.92 mm cable cost more than an SMA cable?
The connectors are precision stainless parts machined to tighter tolerances for operation to 40 GHz, and the cable and test are more demanding.
How does quantity affect cable assembly price?
Setup, programming and test time are shared across the order, so per-unit price drops as quantity rises, especially from 1 to 100 pieces.
Does phase matching increase cost?
Yes. Each cable is measured on a VNA and trimmed, which adds labor and tighter material selection.
Is cheaper coax cable worse?
Not necessarily. It may be perfectly suited to a low-frequency link. It is worse only if used beyond its frequency, loss or durability limits.
How can I lower the cost of a custom cable assembly?
Use the lowest connector grade that meets the frequency, relax tolerances, standardize part numbers, and order in batches.
Where does the cost go in a precision assembly?
Mostly in the connectors, the cable and the testing, with labor for forming and trimming.
Price follows performance. Define the frequency, tolerance and test level first, then choose connectors and cable to match, and ask for a quote broken into those parts so you can see where to trade.
SigmaRF builds both ends of that range: volume assemblies from our India (Vadodara) facility and precision assemblies from our USA (Cleveland area) facility, each VNA-swept for VSWR and insertion loss before shipment. Lead times can be as short as 2 days.
Want a price breakdown?
Send connectors, cable, length, frequency and quantity for a quote.
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