Link BudgetAdding gains and subtracting losses in decibels to predict what a receiver will see.Electrical EngineeringReceived power is transmitted power plus bothantenna gains, minus path loss and every otherloss.P_r(dBm) = P_t + G_t + G_r − FSPL − L2.4 GHz over 100 mFSPL ≈ 80 dBFree space.Twice the distance6 dB more lossInverse square.Twice the frequency6 dB more lossFixed aperture.THE COMMON MISTAKEReading free-space loss as absorptionIt is a fixed power spreading over areaNothing absorbs the energy in free space. The same power simply covers alarger sphere, so less lands in the receiving aperture.FSPL(dB) = 32.44 + 20 log f(MHz) + 20 log d(km). A fade margin on topcovers rain, multipath and obstruction.Link Budgetlearnposters.com
Link Budget — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Link Budget poster

The rule, 3 worked examples, and the mistake everyone makes.

FSPL(dB) = 32.44 + 20 log f(MHz) + 20 log d(km). A fade margin on top covers rain, multipath and obstruction.

Questions about the Link Budget poster

What’s on the Link Budget poster?
The rule, 3 worked examples, and the mistake everyone makes. Received power is transmitted power plus both antenna gains, minus path loss and ever…; P_r(dBm) = P_t + G_t + G_r − FSPL − L; 2.4 GHz over 100 m = FSPL ≈ 80 dB; Twice the distance = 6 dB more loss; Twice the frequency = 6 dB more loss; Common mistake: Reading free-space loss as absorption → It is a fixed power spreading…. FSPL(dB) = 32.44 + 20 log f(MHz) + 20 log d(km). A fade margin on top covers rain, multipath and obstruction.
Who is the Link Budget poster for?
Link Budget belongs to the Electrical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning electromagnetics can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Link Budget poster?
Use it to check a radio link closes before anything is built or specified. A wall chart earns its place by being glanceable from where the work is happening, so Link Budget belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with Link Budget?
Antenna Fundamentals, Antenna Types and Boundary Conditions sit alongside Link Budget in the Electrical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Antenna FundamentalsAntenna TypesBoundary Conditions
Is the Link Budget poster free to download and print?
Yes. Link Budget downloads as a free PDF with no account, no email and no watermark, like everything else in the Electrical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Link Budget poster print at?
Link Budget is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Link Budget loses nothing.Printing guide

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