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Start with a complete antenna mounting drawing

Identify the exact antenna or controlled conductor drawing. Record the feed connection, mechanical supports, required orientation and installed height. If a single lead both supports the antenna and carries RF, make those two roles explicit in the review.

Define datums that an assembler can use. A height measured from the board surface is different from one measured from the bottom of the lead or a nearby component. Include which side of the board receives the part and how any bend or formed feature is oriented.

Keep the product environment with the drawing. Enclosure closure, a nearby shield or cable routing can alter the antenna installation. The spring antenna guide covers formed-conductor repeatability, while this page focuses on the hole, lead and assembly interface.

Distinguish finished hole diameter from drilling information

Use the finished hole requirement for the fit calculation when plating is part of the construction. A nominal drill tool diameter alone does not describe the final opening after processing. State tolerances and ask the fabricator to establish the appropriate process for the finished drawing requirement.

For a round lead and hole, minimum finished hole minus maximum lead gives a simple worst-case diametral allowance under the stated size assumptions. The radial allowance is half that value for a concentric geometry. The worksheet displays both quantities and preserves a negative result as interference requiring review.

The calculation excludes positional tolerance, lead straightness, plating variation beyond the entered limits and nonround cross-sections. A square or formed lead needs an appropriate fit model rather than substituting one convenient side dimension. Do not use positive calculated clearance as automatic assembly approval.

Finished-hole and round-lead allowance

Review the pad, plating and joint requirements

Define whether the hole is plated, how it connects electrically, and which layers and pads participate. Pad geometry and annular ring must be reviewed with the actual fabrication and assembly requirements. The fit worksheet deliberately does not infer those features from antenna frequency or lead diameter.

Agree applicable workmanship criteria, standard edition and customer requirements with the assembly team. Joint accessibility, soldering method and thermal context affect process planning. Do not treat a generic IPC label as a complete instruction for an unusual mechanical or RF joint.

Specify any permitted protrusion, trimming or post-solder operation. A lead cut after assembly may be an electrical geometry change as well as a mechanical operation. If its length matters to the evaluated antenna, keep the accepted configuration visible in the drawing and inspection plan.

Include the RF transition in the model or validation

The lead, pad, via barrel, feed route and return structure form a physical transition. A nominally matched trace ending at a large pad does not guarantee the full path has the intended response. Establish the model or measurement boundary around the actual connection.

Review nearby ground and reference continuity using the selected antenna design. Do not apply one generic copper-clearance rule to all through-hole antennas. A structure relying on a reference ground differs from another structure whose radiating region needs a defined exclusion area.

If the antenna connects through a coaxial or other cabled interface instead, the RF cable page helps define the assembly and launch boundary. In either case, include the mechanical connection actually used in the prototype so the measured result can be reproduced.

Choose assembly controls that preserve installed geometry

Decide whether the antenna is manually inserted, held by a fixture, mechanically supported or attached in a later operation. Identify the dimensions each step must preserve. An operator should not have to guess the intended tilt or bend from a marketing photograph.

Account for the thermal and access constraints of the chosen soldering process. Nearby components, large copper areas and mechanical supports can influence process setup. Use the actual component limits and an agreed process rather than a universal temperature or dwell-time number from an unrelated example.

Record rework and replacement instructions where needed. Removing or reshaping an antenna can change the board connection or conductor geometry. State when the repaired assembly needs dimensional or RF re-verification, and preserve the identity of any experimental modifications.

Verify fit, workmanship and RF behavior separately

Mechanical inspection establishes the relevant size, position and orientation. Workmanship inspection addresses the agreed joint requirements. An RF measurement or functional test addresses the electrical behavior. Each should report the property it actually evaluates.

A continuity check does not prove the transition is electrically suitable over the operating band. Conversely, a short-range wireless connection does not demonstrate acceptable solder workmanship or mechanical retention. Preserve the evidence streams rather than allowing one convenient test to stand in for all three.

For repeatability, compare representative units and record the actual installed geometry. If performance correlates with tilt, height or lead trim, investigate a process control that addresses that variation. Avoid turning an unexplained spread into a broad tolerance claim without supporting evidence.

Prepare the assembly enquiry and release

Supply the PCB fabrication data, antenna part or drawing, BOM, placement and assembly notes, quantity and required inspection or test scope. Identify open fit or geometry questions clearly. If a prototype is still being tuned, distinguish released dimensions from experimental ones.

The wireless PCB assembly guide connects this mechanical operation with module identity, programming and production-test records. Include those wider requirements when they belong to the build, rather than assuming that antenna installation implies a complete wireless qualification service.

Use the worksheet as an optional record of entered limits and the mechanical allowance. It contains no fabrication capability database and does not inspect your files. Contact 吃瓜tv directly for review of the actual construction; any downloaded summary stays local and must be attached manually.

Review the whole tolerance and assembly problem

Size clearance is only one part of fit. Lead form, position, board thickness, insertion access and the selected soldering process can matter to the installed result. The simple round-lead worksheet should not obscure those separate dimensions and operations.

Keep the actual finished geometry with RF evidence. If trimming, bending or rework changes the conductor after assembly, record the change and determine which verification must be repeated. A mechanically convenient correction is not automatically electrically neutral.