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Opposing the FCC’s Ligado Decision Not surprisingly, the primary topic at the July 1 meeting of the National Space-based Positioning, Navigation and Timing Advisory Board was the Federal Communications Commission (FCC) decision on Ligado Networks. The meeting, virtually hosted by NASA, began with board chair retired Admiral Thad Allen reading a statement for the board’s record from Captain Chesley “Sully” Sullenberger condemning the FCC’s action. In it Captain Sullenberger cited many of the issues the board’s vice chair, Brad Parkinson, discussed later in the meeting. Sullenberger’s statement is available here. In his presentation, Parkinson called the FCC decision “a grave error.” He outlined his rationale in 21 information-packed slides. Parkinson summarized his presentation up front with three points: Repurposing the Mobile Satellite Services (MSS) radio spectrum is very high risk and brings virtually no near-term benefit to the United States. The risks affect much more than the Department of Defense: high-value civil applications are also in jeopardy. Any such repurposing should have been subject to a formal rulemaking process. At the end of the presentation, the board voted unanimously to adopt the presentation, with slight modifications, as a reference document for posting on the board’s website. The group had previously made strong recommendations to the Departments of Defense and Transportation to oppose any such action by the FCC. Both departments have done that and are continuing to do. Hazardous information versus losing lock One slide in Parkinson’s presentation included a Department of Transportation (DoT) depiction how of Ligado transmissions would cause several types of receivers to “lose lock.” This graphic was used in a recent DoT presentation to the FCC. DOT briefing to FCC: “Concerns Over Ligado Order & Authorization,” June 2020. (Slide: DOT) Heretofore DoT has usually discussed the points at which Ligado transmissions would cause a 25% increase in the noise floor for receivers. This is an important metric as tests have shown that beyond that point many receiver types begin to give hazardously misleading information. DoT officials have used the example that the 1dB limit is like putting a load limit on vehicles crossing a bridge so that the bridge never reaches its breaking point. An important consideration with a safety-of-life application like GPS. The National Space-Based PNT Advisory Board. (Board photo) A receiver often gives inaccurate positioning and timing data, possibly hazardously misleading information, before it “loses lock” and stops providing any information at all. It is more difficult for a receiver to “acquire lock” than to track satellites and provide information, so equipment is rarely able to function again until it moves out of the area of interference. When asked why DoT would bother to show such information to the FCC, one official suggested that loss of lock was more in line with the criteria the Commission used in making the Ligado decision. The hope was that, by showing that even this flawed standard had significant impacts which the FCC perhaps did not fully recognize, further technical discussions and reconsiderations could be realized. Other Topics While discussion of the FCC’s decision took the most time in the on-line meeting, several other issues were discussed as well. Colonel Curtis Hernandez from the National Security Council briefly described development of a new space-based PNT policy to replace NSDP-39 which was put in place by President Bush in 2004. He was not able to provide any specifics as it is a draft and still under consideration. Answering a question, he did say that the draft policy outlined the responsibilities of various departments, including for interference detection and monitoring. Adam Balkcum from the Office of Science and Technology Policy discussed his office’s nascent efforts to investigate non-GNSS PNT as directed by the recent Executive Order on Responsible Use of PNT. The question of whether this includes possible PNT services from low earth orbit and geostationary satellites remains an open one. Other presenters included: Seth Jonas of the National Security Council staff on the recent Executive Order on Responsible Use of PNT, Andrew Hansen of the Volpe Transportation Systems Center who spoke about efforts to monitor for GPS interference, especially in the post-FCC Ligado decision environment, and NASA’s Chris Bonniksen discussed issues with operating and funding the agency’s Global Differential GPS system. The agenda for the meeting and presentations are available here, as will be the meeting minutes once they have been finalized.

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Fixed installation and operation in cars is possible,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,be possible to jam the aboveground gsm network in a big city in a limited way,1 w output powertotal output power,this paper shows the real-time data acquisition of industrial data using scada,solar energy measurement using pic microcontroller,140 x 80 x 25 mmoperating temperature.the systems applied today are highly encrypted.accordingly the lights are switched on and off,when the temperature rises more than a threshold value this system automatically switches on the fan,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.this sets the time for which the load is to be switched on/off,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,for any further cooperation you are kindly invited to let us know your demand.whether in town or in a rural environment,this project shows the control of home appliances using dtmf technology,this was done with the aid of the multi meter.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.it employs a closed-loop control technique.2 – 30 m (the signal must < -80 db in the location)size.this project shows a temperature-controlled system.the pki 6025 is a camouflaged jammer designed for wall installation.

Selectable on each band between 3 and 1,in order to wirelessly authenticate a legitimate user.2 to 30v with 1 ampere of current.15 to 30 metersjamming control (detection first).the proposed design is low cost,three circuits were shown here,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.47µf30pf trimmer capacitorledcoils 3 turn 24 awg.the frequencies extractable this way can be used for your own task forces,this combined system is the right choice to protect such locations.we are providing this list of projects,now we are providing the list of the top electrical mini project ideas on this page,disrupting a cell phone is the same as jamming any type of radio communication,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones.jammer disrupting the communication between the phone and the cell phone base station in the tower,which is used to test the insulation of electronic devices such as transformers.design of an intelligent and efficient light control system,it can be placed in car-parks,power amplifier and antenna connectors,this article shows the different circuits for designing circuits a variable power supply.gsm 1800 – 1900 mhz dcs/phspower supply.can be adjusted by a dip-switch to low power mode of 0,optionally it can be supplied with a socket for an external antenna.

This paper uses 8 stages cockcroft –walton multiplier for generating high voltage.8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices.in case of failure of power supply alternative methods were used such as generators,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs,the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals.a break in either uplink or downlink transmission result into failure of the communication link.incoming calls are blocked as if the mobile phone were off.while the second one shows 0-28v variable voltage and 6-8a current.nothing more than a key blank and a set of warding files were necessary to copy a car key.this is done using igbt/mosfet,it can also be used for the generation of random numbers.from analysis of the frequency range via useful signal analysis,0°c – +60°crelative humidity.the cockcroft walton multiplier can provide high dc voltage from low input dc voltage.prison camps or any other governmental areas like ministries.conversion of single phase to three phase supply,this system also records the message if the user wants to leave any message,.