Published on 10/19/2026
Your team has a shortlist of three RF cable assembly suppliers. All three sent a quote, all three say they test everything, and the prices are within 15 percent. How do you pick? This page gives you 12 checks, the question to ask for each, and what a good answer sounds like. Use it as a supplier audit before you place a first order.
The checks apply to any manufacturer. At the end we show how SigmaRF answers them, so you can hold us to the same standard.
On This Page
A cable assembly looks simple, which is why bad suppliers survive. A fault in one assembly shows up as a lost link, a noisy measurement or a field return weeks later, and by then the supplier is a name on a purchase order. A 30-minute audit before you buy costs far less than one rejected lot.
| Check | Question to ask | What a good answer sounds like |
|---|---|---|
| 1. In-house test | Do you sweep every assembly on a VNA, or sample a batch? Which VNA and what frequency range? | Names the equipment, tests each unit or states the sampling plan, and offers the data. |
| 2. Traceability | Can you trace cable and connector lots for a given assembly? | Lot numbers recorded per order, retrievable on request. |
| 3. First article process | What do I get on the first build before production? | A defined first piece with measured results, not "we ship and see". |
| 4. Crimp control | How do you verify crimp height or pull strength? | Describes dies, checks and a pull or cross-section routine. |
| 5. Workmanship standard | Which workmanship standard do operators follow? | Names an internal or industry standard and trains to it. |
| 6. Capacity vs your volume | Can you handle my annual volume and my peak month? | Gives a realistic figure and says what changes at 10x. |
| 7. Engineering review | Will an engineer review my drawing before quoting? | Yes, and flags issues such as bend radius or connector clearance. |
| 8. Lead time honesty | What is the lead time and what could extend it? | Gives a range and the conditions: stock, approvals, parts to order. |
| 9. Documentation | What paperwork ships with each order? | Certificate of conformance and test report, as agreed in advance. |
| 10. Requote behaviour | What triggers a price change after the quote? | Lists the triggers up front: drawing change, quantity change. |
| 11. Surge handling | What happens if I double my order next quarter? | Explains material buffer and a plan, not "no problem". |
| 12. References | Can I speak to a customer with a similar build? | Offers a reference or case example, or explains why it cannot. |
Key idea
Ask every supplier the same 12 questions in writing and compare the answers side by side. Vague answers to specific questions tell you more than the prices do.
Want to see how a supplier answers these? Send us your spec and the same 12 questions.
Send Your SpecWalk-away signals
For more on how shortcuts show up in the product, read why cheap RF cable assemblies fail. To see what a real test report contains, see cable assembly test report contents.
Score each check from 0 to 2: 0 for no answer or a vague one, 1 for a partial answer, 2 for a specific and verifiable one. Total out of 24.
| Score | Reading | Action |
|---|---|---|
| 20 to 24 | Strong supplier | Proceed to a first article order. |
| 14 to 19 | Acceptable with gaps | Ask for a first article and test data before volume. |
| Below 14 | Weak or unclear | Keep on the list only for non-critical parts. |
Weight the checks by your risk. For a link-critical assembly, double the weight of checks 1, 2 and 3. For a repeat commodity build, weight checks 6 and 10 higher. Also note a supplier that explains a weakness honestly. That scores better than silence.
We would rather you test us than trust us. On the points above:
If any answer here is not specific enough for your audit, ask. Our custom assembly page lists what we build, and the India and USA manufacturing overview explains how the two sites work together.
How do I choose an RF cable assembly manufacturer?
Compare suppliers on test capability, traceability, first article process, lead time honesty and documentation, not on price alone. Ask the same written questions to each and score the answers.
What should I ask an RF cable assembly supplier before ordering?
Ask whether every unit is VNA tested, what data you receive, how lots are traced, what lead time conditions apply and what triggers a requote.
What certifications should a cable assembly supplier have?
It depends on your industry. ISO 9001 is a common baseline for quality management. Ask for the certificate and its scope rather than a logo on a website. Do not assume a certification covers your product.
How do I verify that a supplier tests every assembly?
Ask for sample per-unit test data from a recent order with serial numbers or order references, and ask which instrument made the measurement.
Is a cheaper cable assembly quote ever fine?
Yes, for non-critical parts with relaxed specs. For link-critical assemblies, a much cheaper quote often means batch sampling, no test data or lower grade cable.
How long does supplier qualification take?
A paper audit takes a few days. A first article order adds the build lead time. Many buyers run the audit and the first article in parallel to save time.
Can I audit SigmaRF?
Send your spec and your audit questions through the contact page and an engineer will respond.
Twelve questions, asked in writing, separate real manufacturers from order takers. Score the answers, weight the checks by your risk and run a first article before volume. A supplier that welcomes the audit is usually the one worth buying from.
Ready to talk about your build?
Send your spec through the contact page for a quote with per-unit test data.
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