LinkScope Sourcing 33 notes on attenuator briefs

Field notes for buyers who are still filling an RF attenuator sheet. Each note explains a field or an evidence request. None of them is a factory announcement.

Use a note when the drawing is still open. A fixed coaxial barrel, a PCB pi network, and a switched step box should not share one sentence. Record attenuation in dB, the tolerance, and the frequency points. Impedance is 50 ohm or 75 ohm, and a transition between them carries its own loss, near 5.7 dB for a resistive 50-to-75 match. Average power needs an ambient, often discussed at 25 °C, plus a derating note. A 10 dB pad absorbs about 90 percent of a continuous input, so the watt rating and the input level are different numbers.

VSWR and return loss can be translated. A VSWR of 1.20:1 is a reflection coefficient near 0.0909 and a return loss near 20.8 dB. Write the band with the figure. SMA interfaces are often discussed to 18 GHz and sometimes to 26.5 GHz on a precision grade. Copy the limit from the offered model. Many SMA coupling notes cite about 0.9 N·m. That torque belongs to the connector sheet, not to this blog. For a matched passive pad, noise figure in dB is commonly equal to the attenuation in dB. Treat the relation as a question for the link budget, not as a lab result published here.

The desk does not hold stock, does not certify FCC status under 47 CFR Part 2 Subpart J, and does not print a saving rate. Quantity, destination, and timing still belong on the form after the note has done its job. OEM-marked and unmarked barrels stay a buyer choice after pin depth is compared. New and refurbished bodies stay a second choice after wear and lot records are shown.