DESK METHOD
LinkScope Sourcing 34 coordinates factory questions for buyers who need an rf isolator sma line written so two plants can answer it. The desk does not build ferrite devices, does not hold a warehouse, and does not present itself as an authorized channel for any third-party mark.
Open a brief
The 2026 intake asks for frequency range, impedance, connector series and gender, and whether the part is a two-port terminated body or a three-port circulator. A typical SMA request is 50 ohm. Polarization and radiation pattern are marked not applicable unless the line is an antenna.
Forward power rating, peak, and internal termination rating are stored as separate notes. An example buyer split is 10 W forward and 2 W in the load. Insertion loss and isolation thresholds travel with a temperature, often 25 C for a bench and a stated kelvin value for a cold stage.
Factories are asked for a datasheet revision and an S-parameter plot that names the model. VSWR and return loss should both appear or be convertible. Calibration traceability, such as a SOLT routine, is a question about the plot, not a claim that this desk owns an analyzer.
Gain and transmit power are copied onto an amplifier row when the bill includes one. Receiver sensitivity stays with the radio. Measurement accuracy is discussed as the buyer’s incoming check, not as a published capability of LinkScope Sourcing 34. Connector mating cycle is requested when the SMA port will be reworked often. Ingress protection is requested when the body is outdoors. Environmental rating is a range the buyer states, for example 0 C to 55 C in a hut.
Commercial notes sit beside the physics. Quantity in pieces, US destination, requested timing, currency, and whether a budget is per piece or for the whole order. High-end, mid-range, budget, or undecided is recorded as the buyer’s preference. No factory is labeled with that word by this desk.
No inventory is implied by an inquiry card or by this page. A supplier names availability against the model after the brief exists. A card titled with a search phrase is a label for the conversation.
No. Passive isolators often have no grant under 47 CFR Part 2 Subpart J. The transmitter they sit beside might. Buyers look up the radio model on eCFR and ask the quoting factory which file, if any, they will attach. An ISO 9001 certificate, when offered, needs the certification body and the expiry year. This desk has not performed that audit. An NRTL mark is frequently the wrong document for a passive coaxial part.
One view: a new body keeps connector history simpler and may match a current drawing. The other view: a refurbished body can fill a discontinued frequency window when condition, test date, and warranty text are explicit. LinkScope Sourcing 34 places both replies in the same column set and does not pick a winner. A vendor-marked part may fit a radio maker’s approved list. A compatible part may still be usable when the plot matches the host. Those are buyer decisions.
It will not invent a street address, a savings rate, a factory headcount, or a customer quotation. Limits that remain even after a careful brief: out-of-band isolation is unspecified, the load rating can be lower than the forward rating, and a 25 C plot does not describe a 4 K stage. The cold-stage page and the port-map page keep those limits in their own words. The checklist note is a longer attribute list, not a test report.
Use the form for frequency range, connector, power split, quantity, destination, and timing. The strip is the handoff, not a second company.
QUALIFIED BUSINESS BUYERS
The desk can ask factories for quotations after the isolator line is written down.
Eligibility applies to qualified business buyers and is confirmed after we review your product, quantity, destination, and sourcing requirements.