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DAS Link Budget Calculation: A Step-by-Step Guide from RRU to Antenna Port
Oct , 13 2026
Why Is the Link Budget Always Off? The most frustrating part of DAS design isn't drawing the system diagram. It's calculating the antenna port power, thinking it's sufficient, and then measuring it on site to find it's off by 5 or 6 dB. Coverage shrinks, users complain, and when you trace it back you find — component insertion loss was undercalculated, feeder loss was estimated wrong, connector lo...
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Multi-Operator DAS: Band Combination Traps That Create Fatal Intermodulation
Oct , 27 2026
The most dangerous scenario in a multi-operator DAS is rarely caused by choosing a component with a poor PIM specification. The real problem often lies in the band plan itself — the frequency relationship between two downlink bands mathematically places intermodulation products inside another operator's uplink receive band. No matter how good the components are, the products land where they land. ...
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VSWR vs Return Loss vs Isolation vs Directivity: How These Four RF Parameters Connect
Nov , 03 2026
A conversation that happens on site more often than it should "What's the isolation on this coupler?" "22dB." "And directivity?" "Not listed. It only says isolation." "So can we use this part or not?" The conversation stalls here. 22dB isolation doesn't sound bad. But without directivity, you don't know whether that 22dB comes from "the forward coupled port and the reverse isolation port are well ...
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Cavity vs Dielectric vs SAW vs Microstrip Filter: DAS Selection Guide
Nov , 11 2026
A filter selection mistake costs far more than a coupler mistake. Get a coupler wrong and you lose a fraction of a dB in insertion loss. Get a filter wrong and you can burn out a power amplifier, eat the entire link budget with in-band insertion loss, or watch the center frequency drift out of band at high temperature. The most common mistake in selection guides is asking "which filter is best." N...
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