Published on 10/13/2026
A radio team orders 5 prototype cables, finds that a 0.5 m length does not fit, changes it to 0.42 m and orders 5 more. After three rounds, the design freezes and they place a production order for 2,000. The supplier quotes 8 weeks because the cable has a long lead time and the production line was never validated.
Most delays between prototype and production are planning problems, not factory problems. Minimum order quantity (MOQ), component lead times and revision control decide whether you get parts in days or in months.
This guide covers how to plan each stage, what to ask about MOQ, which items usually set lead time, how to control revisions, and how to qualify a build before the big order. For the RFQ itself see our RFQ checklist.
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Stage 01
Prototype
One to ten pieces. Goal is to test fit, loss and routing. Standard cable and connectors from stock give the fastest turnaround.
Stage 02
Engineering validation
Ten to fifty pieces. Freeze the length, connectors and marking, run full VNA tests and environmental checks.
Stage 03
Pilot run
Fifty to a few hundred. Use the production process, test limits and packaging. This is where the process is validated.
Stage 04
Production
Release with forecast and schedule. Keep a golden sample and a documented revision.
MOQ exists because setup, test programming, cable cutting and packaging have fixed effort, and some materials such as special cable or connectors are bought in reels or boxes. For standard cable assemblies, MOQ is usually low or none, and for special materials it may be set by the component supplier.
| Situation | What to ask | Option |
|---|---|---|
| Standard cable and connectors in stock | Is there an MOQ for prototypes? | Usually low, ask for quote at 1, 10, 100 |
| Special cable or precision connector | What is the component MOQ and lead time? | Buy a reel or connector kit once, build in batches |
| Custom marking or boots | Is there a fixed setup charge? | Combine marking across part numbers |
| Phase matched sets | Minimum set size? | Order full sets, not single cables |
| Driver | Typical effect | How to shorten |
|---|---|---|
| Connector availability | Common series ship from stock; precision or unusual ones can take weeks | Confirm stock before the drawing is final |
| Cable availability | Standard RG cables ship quickly; special constructions are slower | Use standard cable where possible |
| Test and documentation | Full sweeps and reports add time per unit | State required test early |
| Revisions | Each change restarts material and setup | Freeze before the pilot |
| Shipping and customs | Cross-border time and paperwork | Choose the facility closest to the destination |
For standard assemblies, SigmaRF lead times can be as short as 2 days. Custom, precision or special-material builds take longer, and we confirm the date at quotation.
Revision checklist
Common mistakes
Before releasing a production order, inspect and test a first article: check the connector types, length and tolerance, marking, and a full VNA sweep against the limits. Compare against the golden sample. If the first article passes, the production run repeats the process. Our India (Vadodara) facility handles volume builds and our USA (Cleveland area) facility handles precision builds, so the plan can be set per stage.
First articleVNA sweepPilot runGolden sampleRevision letterForecast
What is MOQ for RF cable assemblies?
The minimum quantity a supplier will build per order. For standard assemblies it is low or none. For special cable or precision connectors it may be set by material purchase quantities.
How long does a custom cable assembly take?
Standard builds can ship in days. Custom, precision or special-material builds usually take longer. SigmaRF lead times can be as short as 2 days for standard builds.
How do I go from prototype to production for RF cables?
Prototype, freeze the design, run an engineering validation and a pilot run with production test limits, then release production against a documented revision.
What is a first article inspection?
A detailed check of the first unit from a new build against the drawing and test limits, done before the full production run.
How do I manage cable assembly revisions?
Use a part number with a revision letter, update the drawing for every change, quote the revision on each order, and keep a golden sample.
Why do cable assemblies have long lead times?
Usually because of a special connector or cable, tight tolerance or test requirements, or a design change that restarts material buying.
Can I order just one custom cable?
Often yes for standard connectors and cable, though special parts may carry a setup charge. Ask for a price break at 1, 10 and 100.
How can I reduce RF cable lead time?
Use standard connectors and cable, freeze the design early, specify test requirements up front, and choose the facility closest to your site.
Plan the path from prototype to production: use stock parts for early builds, ask for price breaks, control revisions and validate with a pilot run before the large order.
SigmaRF builds assemblies from 100 MHz to 40 GHz, with every unit VNA-swept for VSWR and insertion loss before shipment. Prototypes and production run through the same measurement process, from our India (Vadodara) volume facility or USA (Cleveland area) precision facility.
Planning a build from prototype to production?
Tell us quantities and schedule and we will map the stages.
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