Published on 10/13/2026
Space-grade RF cabling requires program-specific material, process, qualification and acceptance evidence beyond a cable's GHz or temperature rating. ISRO-ecosystem suppliers should work from the actual tender, drawing and quality requirements rather than treating ordinary RG316 or a passing VNA sweep as space qualification.
A cable can meet insertion loss on a room-temperature bench yet remain unsuitable for flight hardware because its materials, contamination behavior or qualification history are unresolved. The connector, jacket, adhesive, marking and strain relief all belong in the evidence chain.
This guide is a supplier-readiness checklist. It makes no claim that SigmaRF has space heritage, ISRO approval or a flight-qualified assembly.
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Identify whether the assembly is for spacecraft, launcher, payload, ground test or support equipment. A cable used on a laboratory bench is not automatically qualified for flight, and a ground application may have different hazards and acceptance requirements.
| Use | Requirement to clarify |
|---|---|
| Flight RF path | Program qualification, materials and environmental acceptance |
| Ground test lead | Measurement stability, interfaces and applicable test conditions |
| Support equipment | Installation, exposure and maintenance needs |
| Prototype development | What evidence remains before flight configuration approval |
An ISRO procurement entry for space-qualified RG316 includes separate lot-acceptance-test charges. That illustrates the distinction between buying a nominal cable family and buying the specified qualified material and evidence. It does not create a universal test plan for all programs.
Review cable dielectric and jacket, connector parts, solder, adhesives, heat shrink, labels and cleaning residues against the approved materials/process requirements. A PTFE dielectric or wide operating-temperature range is not a blanket space qualification.
ECSS-Q-ST-70-02 describes thermal-vacuum outgassing screening of materials proposed for spacecraft and related hardware. Its public scope states that acceptance criteria depend on application and location and may be more severe than the standard baseline. Material screening is not the same as complete assembly qualification.
| Material issue | Evidence to request |
|---|---|
| Outgassing/contamination | Approved material identity and applicable screening results |
| Adhesive or potting | Approved formulation, preparation and cure controls |
| Shelf life | Lot identity and expiry/control records where required |
| Cleaning | Approved process and residue/compatibility requirements |
Qualification evaluates the design against the program's requirements. Screening and lot acceptance evaluate supplied items or lots under the agreed plan. Define sample quantities, sequence, limits and records in the contract rather than copying a generic test list.
Step 01
Freeze the design
Record exact components, drawing revision, forming and strain-relief geometry. Substitution requires the agreed approval process.
Step 02
Agree the test sequence
State pre/post electrical checks, environmental tests and any lot acceptance requirements. Acceptance limits must come from the program, not a supplier's generic brochure.
Step 03
Tie records to the hardware
Maintain the required traceability from materials and process records to the assembly identifiers and delivered test reports.
Specify the loss you can afford, not only the cable name
Send SigmaRF your frequency band, connector interfaces, installed length and insertion-loss target. Every assembly is VNA-swept for VSWR and insertion loss before shipment.
Specify a Custom AssemblySpecify frequency range, insertion loss, matching, power and phase or group delay where needed. A connector family ceiling does not establish completed assembly performance, and a room-temperature sweep does not establish stability after environmental exposure.
State the reference planes and routing for any electrical measurement. For shaped semirigid paths, provide the installed drawing and forming requirements. For moving ground-test leads, define stability under movement separately from flight qualification.
Read SigmaRF's MIL-C-17 and IPC/WHMA-A-620 Explained for standards scope, mmWave Interconnects for precision interfaces and Phase-Matched Cable Assemblies for phase requirements. This article focuses on evidence for space-program sourcing.
Illustrative requirement tree for a space-development RF lead. This is not an ISRO-prescribed checklist or a claimed SigmaRF qualification.
Do not infer flight acceptance from completing one line of this tree. Program authority must resolve deviations, material substitutions and the final qualification boundary.
Is RG316 automatically space grade?
No. The cable family name does not establish space qualification. Require the exact approved construction, material evidence and program acceptance records.
Does PTFE make a cable suitable for space?
Not by itself. Other materials, processes, contamination behavior and the complete assembly qualification still need review.
What does an outgassing test prove?
It characterizes material screening properties under defined conditions. Application-specific acceptance and complete assembly qualification remain separate requirements.
Are VNA-tested cables flight qualified?
Not automatically. A VNA sweep checks agreed RF parameters; flight material, process and environmental evidence must also meet the program requirements.
What is LAT in space procurement?
It refers to lot acceptance testing under the applicable procurement plan. Exact samples, tests and limits are program-specific and should be confirmed in the contract.
What should an ISRO-ecosystem cable supplier request first?
The actual drawing, application classification, approved parts/materials requirements, qualification plan and delivery evidence. Do not replace them with a generic space-grade label.
Space RF sourcing is an evidence problem as well as an electrical design problem. Identify the application and approved configuration, then tie materials, processes and test results to the hardware.
SigmaRF VNA-sweeps every assembly for VSWR and insertion loss before shipment across its stated 100 MHz to 40 GHz capability range. That is not a claim of space qualification or ISRO approval. SigmaRF has Vadodara volume and Cleveland-area precision facilities, with lead times as short as 2 days for suitable builds; program-specific qualification and materials must be confirmed separately.
Specify the loss you can afford, not only the cable name
Send SigmaRF your frequency band, connector interfaces, installed length and insertion-loss target. Every assembly is VNA-swept for VSWR and insertion loss before shipment.
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