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Amplifier Going Into Protect Mode? Fix It
Why a multi-zone or 70V amplifier goes into protect mode and the order to find the cause: shorted speaker runs, too low a load,…
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Antenna Tower Concrete Base: Size and Depth
Size an antenna tower concrete base from the maker’s drawing, put the bottom below frost depth, choose embedded base or anchor bolts, set the…
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PoE Injector vs PoE Switch
One injector or a new switch? Compare power budgets, remote power cycling, outlets and failure points, see when a single PoE injector is the…
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CCA vs Pure Copper Ethernet Cable
Copper clad aluminum looks like Cat6 but resists about 46 percent more. See the worked resistance and PoE figures, why CCA is not compliant…
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Motion Detector Placement Guide
Place PIR motion detectors where they catch intruders and ignore everything else: across the walking path, at the listed height, clear of vents, sunlit…
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Varifocal vs Fixed Lens Camera
Fixed or varifocal? Work out field of view and pixels per metre from focal length and sensor size, see when a fixed lens is…
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How to Wire an Electric Strike
Wire an electric strike the right way: size the power supply, choose the relay contact for fail-secure or fail-safe, fit the suppression diode, check…
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Do In Ceiling Speakers Need Back Boxes?
When an in-ceiling speaker needs a back box and when it does not: bass consistency, sound between floors, attic insulation, fire-rated ceilings, and the…
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How to Fix Ground Loop Hum
Track down the hum in an AV system: unplug sources one at a time, fix cable TV coax loops with an isolator, use audio…
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How to Hide TV Wires in the Wall
Hide the cables under a wall-mounted TV the right way: plan the two openings, use CL2 or CL3 rated HDMI and other cable, fit…
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What Size Pipe for an Antenna Mast?
Choose antenna mast pipe by the clamps it must fit, then by stiffness. Diameter, galvanized mast gauge, steel vs aluminum, wind load and telescoping…
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Quad Shield vs Dual Shield Coax
Quad shield adds a second foil and braid to RG6. Learn what the extra layers do for ingress and egress, when quad shield is…
Bursma Distributing
Blog
Guides and product notes for dealers, installers and integrators.