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Technical Downloads:Antenna Tuning Units for Digital AMRF Compliance on Rooftops – and Other Places People Go!AM Antenna Pattern Protection - MM Docket 93-177
LBA Group Gets PatentThe system that allows wireless telephone antennas to be used on AM broadcast antenna towers.
LBA Solves Signal ProblemAGUASCALIENTES, AGS., Mexico- Utilizing the LBA Technology Combipole antenna and diplexer system we solved an unfortunate coverage problem with our RF signal at XELZ...
AM Tower Collocation: Money on the Table?
Detuning Communications Towers Solves AM Reradiation Problem – Technical Note 102The solution to interference between land mobile or microwave towers and AM antennas is often complex...LBA shows its experience.
Gremlins In Your Cell Site? – Technical Note 103The static and dropped calls that are haunting your customers may be coming from your cell site. Learn how to plan for effective RF interference abatement.
High Power RF Interference to Cellular Radio and Telephone Switch Equipment Part I – Technical Note 104Many consumer cellular interference problems are traceable to cell or switching sites located near high power RF installations miles away. Here are some ideas.
High Power RF Interference to Cellular Radio & Telephone Switch Equipment Part II – Tech Note 105More on high power RF interference - with an emphasis on AM Radio.
AM Broadcasting - The New Cellular Design Factor – Technical Note 108One lesser known factor involved in cellular modifications or construction is potential interference with AM antennas. Find out more about AM reradiation problems and site prescreening.
Blowing the Whistle on RF Interference – Technical Note 109Many of the "interference" problems plaguing communicators using cellular, PCS, microwave, satellite or other systems are traceable to events originating not within the communicator's facility, but from proximity to broadcast or other high power RF installations. Find out how you can maintain a steady-state RF situation at any site.
When RF Interference Strikes – Technical Note 110Typically a wireless operator will raise or lower tower height, add radios or change system configurations in an attempt to eliminate service problems. These approaches do not work when EMI strikes. As the following three instances demonstrate, well-designed shielding systems provided cost-effective and lasting solutions.
AM Broadcasting - The Overlooked Wireless Design Factor – Technical Note 113As wireless systems have sprouted towers across the landscape, a seemingly unlikely conflict has arisen between wireless operators and old-fashioned AM broadcast stations. The FCC Rules state that all licensees must avoid interference with all AM broadcast stations. Furthermore, affected licensees must prove to the FCC that they have corrected all such problems. This must be done at their own expense.
AM Colocation - It's Real! – Technical Note 114Today, there are an estimated 10,000 AM towers in the United States, and they are virtually untapped resources for wireless base station sites. And, notwithstanding the mythology, AM colocation is both practical and efficient.
A Primer on Foundation Wizard Dispersive Wave Testing – Technical Note 117Dispersive wave propagation is the name of an area of science which considers how wave motion in solid materials is affected by the mechanical properties and geometry (i.e., boundaries, discontinuities) of the material. Any strike to the surface of a solid creates a disturbance that propagates throughout the solid as a wave.
A Primer on Diplexer/Triplexer Adjustment Procedures – Technical Note 118An increasing number of Medium Wave (AM) diplexers and triplexers are being placed in service. The use of these devices to feed multiple transmitters to common antenna systems may be a cost effective way to minimize the substantial physical plant requirements of MW broadcast stations.
AM Protection - Dealing with Legacy Towers – Technical Note 119A significant number of wireless towers have changed hands; often without supporting documentation that AM protection measures have been taken to comply with the Federal Communications Commission Rules.
NAVTEX in the United States – Technical Note 121The International Maritime Organization has designated NAVTEX as the primary means for transmitting coastal urgent marine safety information to ships worldwide.
U.S. Coast Guard DGPS – Technical Note 122NAVCEN operates the Coast Guard Maritime Differential GPS (DGPS) Service and the developing Nationwide DGPS Service, consisting of two control centers and over 60 remote broadcast sites.
Gremlins in Your Medical Equipment – Technical Note 123RF radiation is everywhere. We can't smell it, see it, hear it or touch it, yet we know it is out there. Medical diagnostic equipment provides unreliable results. Weird audio can be heard through testing equipment. Rock and roll music accompanies a medical diagnostic test. These gremlins are caused by high-power RF installations several miles away, such as AM, FM and shortwave radio, TV, microwave links and other such sources.
RF SHOCK AND BURN: Radio Frequency Radiation – Technical Note 124This note is a compilation of various research studies performed in the late1980s. This research was focused on the RFR levels and conditions that could cause electric shock or tissue burns. Several instruments were used and various frequency levels were tested. The results were differentiated between male and female responses. The results of these research studies were used by regulatory agencies to provide safe guidelines to radio frequency radiation. As with other research of this kind, the researchers suggested that further studies would be beneficial as more information was gleaned regarding shock and burn in humans.
HUMAN RADIO FREQUENCY EXPOSURE FROM SCADA REMOTE SITES – Technical Note 125 The public, workers, and risk managers often raise questions concerning human exposure to radio frequency (non-ionizing RF) energy that might be expected from proximity to antennas, such as at a remote SCADA site. This brief note will provide calculated exposure values and will relate them to U. S. Federal government maximum permitted exposure limits.
Is Your Facility RF Green®? – Technical Note 126Electromagnetical energy is an environmental issue that is often overlooked. This invisible environmental factor should be considered as carefully as air
Keeping Black Hat RF in The Box – Technical Note 127Setting up an isolated, remotely-accessible, secure wireless equipment pod to allow even the most invasive and potentially destructive wireless lab exercises to be performed within an area that is physically adjacent to a wireless production network.
Application Notes:Tunipole™ Folded Unipole Antenna Applications in Medium Frequency Broadcasting – Application 10
Vacuum and Mica Capacitor Inductor Ratings – Application Note 11
Combipole™ Shared Folded Unipole Design – Application 13
Quick Determination of Medium Wave Coverage – Application Note 15
Quick Method of Finding T Network Values – Application Note 16
Medium Wave AM Antenna Tower Goes Mobile – Application Note 17
RF INTERMODULATION PRODUCTS – Application Note 18
RF Vector Impedance Meter Uses – Application Note 19
Technical Practices for LBA Technology AM Tuning Products – Application Note 20
FAQs:Faraday Cage FAQsRF Interference FAQsAM Protection FAQsRF Safety FAQsFolded Unipole FAQsWLAN FAQs
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