What fade margin should an in-building two-way radio DAS use? An RF engineer explains why -95 dBm alone fails and when 10 or 15 dB is needed.

How to measure a building's RF noise floor in dB, and the reading at which filtering beats adding gain. Test method, thresholds and what it costs in coverage.

Voting receivers only fix the uplink. When satellite receivers beat an in-building DAS, when they fail, and what IMDA licensing adds in Singapore.

90% general and 99% critical floor area radio coverage is a US code figure. Singapore prescribes no percentage — here is what to specify instead.

A lift car adds 40-60 dB on top of the building path. Why radios cut out inside lifts, and what a shaft antenna or leaky feeder actually fixes.

The digital cliff effect explained: why DMR radios sound perfect then drop dead, the BER threshold behind it, and the fade margin your DAS needs.

How far apart should in-building DAS antennas be per floor? Real UHF spacing figures, wall-loss numbers and a rule of thumb before your site survey.

DAQ 3.0 and -95 dBm measure different things. Which acceptance criterion should an in-building radio coverage test use? A Singapore RF engineer explains.

A mast-head preamp buys 4-9 dB on the uplink only. A DAS buys 40 dB or more both ways. How to tell which one your building actually needs.

Staff hear the repeater but it can't hear them. The uplink runs 16-20 dB weaker. The link budget maths, and the four fixes that actually work.

How often an in-building radio coverage system must be re-tested in Singapore, who is responsible for the annual test, and what a retest checks.

How integrators measure in-building radio coverage — the grid survey, DAQ score and −95 dBm threshold that decide pass or fail, in a Singapore context.