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The Universal Software Radio Peripheral as RF Front-End By Ningyan Guo, Staffan Backén, and Dennis Akos The authors designed a full-constellation GNSS receiver, using a cost-effective, readily available, flexible front-end, wide enough to capture the frequency from 1555 MHz to 1607 MHz, more than 50MHz. This spectrum width takes into account BeiDou E2, Galileo E1, GPS L1, and GLONASS G1. In the course of their development, the authors used an external OCXO oscillator as the reference clock and reconfigured the platform, developing their own custom wide-band firmware. The development of the Galileo and BeiDou constellations will make many more GNSS satellite measurements be available in the near future. Multiple constellations offer wide-area signal coverage and enhanced signal redundancy. Therefore, a wide-band multi-constellation receiver can typically improve GNSS navigation performance in terms of accuracy, continuity, availability, and reliability. Establishing such a wide-band multi-constellation receiver was the motivation for this research. A typical GNSS receiver consists of three parts: RF front-end, signal demodulation, and generation of navigation information. The RF front-end mainly focuses on amplifying the input RF signals, down-converting them to an intermediate frequency (IF), and filtering out-of-band signals. Traditional hardware-based receivers commonly use application-specific integrated circuit (ASIC) units to fulfill signal demodulation and transfer the range and carrier phase measurements to the navigation generating part, which is generally implemented in software. Conversely, software-based receivers typically implement these two functions through software. In comparison to a hardware-based receiver, a software receiver provides more flexibility and supplies more complex signal processing algorithms. Therefore, software receivers are increasingly popular for research and development. The frequency coverage range, amplifier performance, filters, and mixer properties of the RF front-end will determine the whole realization of the GNSS receiver. A variety of RF front-end implementations have emerged during the past decade. Real down-conversion multi-stage IF front-end architecture typically amplifies filters and mixes RF signals through several stages in order to get the baseband signals. However, real down-conversion can bring image-folding and rejection. To avoid these drawbacks, complex down-conversion appears to resolve much of these problems. Therefore, a complex down-conversion multi-stage IF front-end has been developed. But it requires a high-cost, high-power supply, and is larger for a multi-stage IF front-end. This shortcoming is overcome by a direct down-conversion architecture. This front-end has lower cost; but there are several disadvantages with direct down-conversion, such as DC offset and I/Q mismatch. DC offset is caused by local oscillation (LO) leakage reflected from the front-end circuit, the antenna, and the receiver external environment. A comparison of current traditional RF front-ends and different RF front-end implementation types led us to the conclusion that one model of a universal software radio peripheral, the USRP N210, would make an appropriate RF front end option. USRP N210 utilizes a low-IF complex direct down-conversion architecture that has several favorable properties, enabling developers to build a wide range of RF reception systems with relatively low cost and effort. It also offers high-speed signal processing. Most importantly, the source code of USRP firmware is open to all users, enabling researchers to rapidly design and implement powerful, flexible, reconfigurable software radio systems. Therefore, we chose the USRP N210 as our reception device to develop our wide-band multi-constellation GNSS receiver, shown in Figure 1. Figure 1. Custom wide-band multi-constellation software receiver architecture based on universal software radio peripheral (USRP). USRP Front-End Architecture The USRP N210 front-end has wider band-width and radio frequency coverage in contrast with other traditional front-ends as shown by the comparison in Table 1. It has the potential to implement multiple frequencies and multiple-constellation GNSS signal reception. Moreover, it performs higher quantization, and the onboard Ethernet interface offers high-speed data transfer. Table 1. GNSS front-ends comparison. USRP N210 is based on the direct low-IF complex down-conversion receiver architecture that is a combination of the traditional analog complex down-conversion implemented on daughter boards and the digital signal conditioning conducted in the motherboard. Some studies have shown that the low-IF complex down-conversion receiver architecture overcomes some of the well-known issues associated with real down-conversion super heterodyne receiver architecture and direct IF down-conversion receiver architecture, such as high cost, image-folding, DC offset, and I/Q mismatch. The low-IF receiver architecture effectively lessens the DC offset by having an LO frequency after analog complex down-conversion. The first step uses a direct complex down-conversion scheme to transform the input RF signal into a low-IF signal. The filters located after the mixer are centered at the low-IF to filter out the unwanted signals. The second step is to further down-covert the low-IF signal to baseband, or digital complex down-conversion. Similar to the first stage, a digital half band filter has been developed to filter out-of-band interference. Therefore, direct down-conversion instead of multi-stage IF down-conversion overcomes the cost problem; in the meantime, the signal is down-converted to low-IF instead of base-band frequency as in the direct down-conversion receiver, so the problem of the DC offset is also avoided in the low-IF receiver. These advantages make the USRP N210 platform an attractive option as GNSS receiver front-end. Figure 2 shows an example GNSS signal-streaming path schematic on a USRP N210 platform with a DBSRX2 daughter board. Figure 3 shows a photograph of internal structure of a USRP N210 platform. Figure 2 GNSS signal streaming on USRP N210 + DBSRX2 circuit. Figure 3. USRP N210 internal structure. The USRP N210 platform includes a main board and a daughterboard. In the main board, 14-bit high precision analog-digital converters (ADCs) and digital-analog converters (DACs) permit wide-band signals covering a high dynamic range. The core of the main board is a high-speed field-programmable gate array (FPGA) that allows high-speed signal processing. The FPGA configuration implements down-conversion of the baseband signals to a zero center frequency, decimates the sampled signals, filtering out-of-band components, and finally transmits them through a packet router to the Ethernet port. The onboard numerically controlled oscillator generates the digital sinusoid used by the digital down-conversion process. A cascaded integrator-comb (CIC) filter serves as decimator to down-sample the signal. The signals are filtered by a half pass filter for rejecting the out-of-band signals. A Gigabit Ethernet interface effectively enables the delivery of signals out of the USRP N210, up to 25MHz of RF bandwidth. In the daughterboard, first the RF signals are amplified, then the signals are mixed by a local onboard oscillator according to a complex down-conversion scheme. Finally, a band-pass filter is used remove the out-of-band signals. Several available daughter boards can perform signal conditioning and tuning implementation. It is important to choose an appropriate daughter board, given the requirements for the data collection. A support driver called Universal Hardware Driver (UHD) for the USRP hardware, under Linux, Windows and Mac OS X, is an open-source driver that contains many convenient assembly tools. To boot and configure the whole system, the on-board microprocessor digital signal processor (DSP) needs firmware, and the FPGA requires images. Firmware and FPGA images are downloaded into the USRP platform based on utilizations provided by the UHD. Regarding the source of firmware and FPGA images, there are two methods to obtain them:   directly use the binary release firmware and images posted on the web site of the company;   build (and potentially modify) the provided source code. USRP Testing and Implementation Some essential testing based on the original configuration of the USRP N210 platform provided an understanding of its architecture, which was necessary to reconfigure its firmware and to set up the wide-band, multi-constellation GNSS receiver. We collected some real GPS L1 data with the USRP N210 as RF front-end. When we processed these GPS L1 data using a software-defined radio (SDR), we encountered a major issue related to tracking, described in the following section. Onboard Oscillator Testing. A major problem with the USRP N210 is that its internal temperature-controlled crystal oscillator (TCXO) is not stable in terms of frequency. To evaluate this issue, we recorded some real GPS L1 data and processed the data with our software receiver. As shown in Figure 4, this issue results in the loss of GPS carrier tracking loop at 3.18 seconds, when the carrier loop bandwidth is 25Hz. Figure 4. GPS carrier loop loss of lock. Consequently, we adjusted the carrier loop bandwidth up to 100Hz; then GPS carrier tracking is locked at the same timing (3.18s), shown in Figure 5, but there is an almost 200 Hz jump in less than 5 milliseconds. Figure 5. GPS carrier loop lock tracking. As noted earlier, the daughter card of the USRP N210 platform utilizes direct IF complex down-conversion to tune GNSS RF signals. The oscillator of the daughter board generates a sinusoid signal that serves as mixer to down-convert input GNSS RF signals to a low IF signal. Figure 6 illustrates the daughter card implementation. The drawback of this architecture is that it may bring in an extra frequency shift by the unstable oscillator. The configuration of the daughter-card oscillator is implemented by an internal TCXO clock, which is on the motherboard. Unfortunately, the internal TCXO clock has coarse resolution in terms of frequency adjustments. This extra frequency offset multiplies the corresponding factor that eventually provides mixer functionality to the daughter card. This approach can directly lead to a large frequency offset to the mixer, which is brought into the IF signals. Figure 6. Daughter-card tuning implementation. Finally, when we conduct the tracking operation through the software receiver, this large frequency offset is beyond the lock range of a narrow, typically desirable, GNSS carrier tracking loop, as shown in Figure 4. In general, a TCXO is preferred when size and power are critical to the application. An oven-controlled crystal oscillator (OCXO) is a more robust product in terms of frequency stability with varying temperature. Therefore, for the USRP N210 onboard oscillator issue, it is favorable to use a high-quality external OCXO as the basic reference clock when using USRP N210 for GNSS applications. Front-End Daughter-Card Options. A variety of daughter-card options exist to amplify, mix, and filter RF signals. Table 2 lists comparison results of three daughter cards (BURX, DBSRX and DBSRX2) to supply some guidance to researchers when they are faced with choosing the correct daughter-board. Table 2. Front-end daughter-card options. The three daughter cards have diverse properties, such as the primary ASIC, frequency coverage range, filter bandwidth and adjustable gain. BURX gives wider radio frequency coverage than DBSRX and DBSRX2. DBSRX2 offers the widest filter bandwidth among the three options. To better compare the performance of the three daughter cards, we conducted another three experiments. In the first, we directly connected the RF port with a terminator on the USRP N210 platform to evaluate the noise figure on the three daughter cards. From Figure 7, we can draw some conclusions: BURX has a better sensitivity than DBSRX and DBSRX2 when the gain is set below 30dB. DBSRX2 observes feedback oscillation when the gain set is higher than 70dB. Figure 7. Noise performance comparisons of three daughter cards. The second experimental setup configuration used a USRP N210 platform, an external OCXO oscillator to provide stable reference clock, and a GPS simulator to evaluate the C/N0 performance of the three daughter boards. The input RF signals are identical, as they come from the same configuration of the GPS simulator. Figure 8 illustrates the C/N0 performance comparison based on this experimental configuration. The figure shows that BURX performs best, with DBSRX2 just slightly behind, while DBSRX has a noise figure penalty of 4dB. Figure 8. C/N0 performance comparisons of three daughter cards. In the third experiment, we added an external amplifier to increase the signal-to-noise ratio (SNR). From Figure 9, we see that the BURX, DBSRX and DBSRX2 have the same C/N0 performance, effectively validating the above conclusion. Thus, an external amplifier is recommended when using the DBSRX or DBSRX2 daughter boards. Figure 9. C/N0 performance comparisons of three daughter cards with an external amplifier. The purpose of these experiments was to find a suitable daughter board for collecting wide-band multi-constellation GNSS RF signals. The important qualities of an appropriate wide-band multi-constellation GNSS receiver are: high sensitivity; wide filter bandwidth; and wide frequency range. After a comparison of the three daughter boards, we found that the BURX has a better noise figure than the DBSRX or DBSRX2. The overall performance of the BURX and DBSRX2 are similar however. Using an external amplifier effectively decreases the required gain on all three daughter cards, which correspondingly reduces the effect of the internal thermal noise and enhances the signal noise ratio. As a result, when collecting real wide-band multi-constellation GNSS RF signals, it is preferable to use an external amplifier. To consider recording GNSS signals across a 50MHz band, DBSRX2 provides the wider filter bandwidth among the three daughter-card options, and thus we selected it as a suitable daughter card. Custom Wide-band Firmware Development. When initially implementing the wideband multi-constellation GNSS reception devices based on the USRP N210 platform, we found a shortcoming in the default configuration of this architecture, whose maximum bandwidth is 25MHz. It is not wide enough to record 50MHz multi-constellation GNSS signals (BeiDou E2, GPS L1, Galileo E1, and GlonassG1). A 50MHz sampling rate (in some cases as much as 80 MHz) is needed to demodulate the GNSS satellites’ signals. Meanwhile since the initiation of the research, the USRP manufacturer developed and released a 50MHz firmware. To highlight our efforts, we further modified the USRP N210 default configuration to increase the bandwidth up to 100MHz, which has the potential to synchronously record multi-constellation multi-frequency GNSS signals (Galileo E5a and E5b, GPS L5 and L2) for further investigation of other multi-constellation applications, such as ionospheric dispersion within wideband GNSS signals, or multi-constellation GNSS radio frequency compatibility and interoperability. Apart from reprogramming the host driver, we focused on reconfiguring the FPGA firmware. With the aid of anatomizing signal flow in the FPGA, we obtained a particular realization method of augmenting its bandwidth. Figure 10 shows the signal flow in the FPGA of the USRP N210 architecture. Figure 10. Signal flow in the FPGA of the USRP N210 platform. The ADC produces 14-bit sampled data. After the digital down-conversion implementation in the FPGA, 16-bit complex I/Q sample data are available for the packet transmitting step. According to the induction document of the USRP N210 platform, VITA Radio Transport Protocol functions as an overall framework in the FPGA to provide data transmission and to implement an infrastructure that maintains sample-accurate alignment of signal data. After significant processing in the VITA chain, 36-bit data is finally given to the packet router. The main function of the packet router is to transfer sample data without any data transformation. Finally, through the Gigabit Ethernet port, the host PC receives the complex sample data. In an effort to widen the bandwidth of the USRP N210 platform, the bit depth needs to be reduced, which cuts 16-bit complex I/Q sample data to a smaller length, such as 8-bit, 4-bit, or even 2-bit, to solve the problem. By analyzing Figure 10, to fulfill the project’s demanding requirements, modification to the data should be performed after ADC sampling, but before the digital down-conversion. We directly extract the 4-bit most significant bits (MSBs) from the ADC sampling data and combined eight 4-bit MSB into a new 16-bit complex I/Q sample, and gave this custom sample data to the packet router, increasing the bandwidth to 100 MHz. Wide-Band Receiver Performance Analysis. The custom USRP N210-based wide-band multi-constellation GNSS data reception experiment is set up as shown in Figure 11. Figure 11. Wide-band multi-constellation GNSS data recording system. A wide-band antenna collected the raw GNSS data, including GPS, GLONASS, Galileo, and BeiDou. An external amplifier was included to decrease the overall noise figure. An OCXO clock was used as the reference clock of the USRP N210 system. After we found the times when Galileo and BeiDou satellites were visible from our location, we first tested the antenna and external amplifier using a commercial receiver, which provided a reference position. Then we used 1582MHz as the reception center frequency and issued the corresponding command on the host computer to start collecting the raw wide-band GNSS signals. By processing the raw wide-band GNSS data through our software receiver, we obtained the acquisition results from all constellations shown in Figure 12; and tracking results displayed in Figure 13. Figure 12. Acquisition results for all constellations. Figure 13. Tracking results for all constellations. We could not do the full-constellation position solution because Galileo was not broadcasting navigation data at the time of the collection and the ICD for BeiDou had not yet been released. Therefore, respectively using GPS and GLONASS tracking results, we provided the position solution and timing information that are illustrated in Figure 14 and in Figure 15. Figure 14. GPS position solution and timing information. Figure 15. GLONASS position solution. Conclusions By processing raw wide-band multi-constellation GNSS signals through our software receiver, we successfully acquired and tracked satellites from the four constellations. In addition, since we achieved 100MHz bandwidth, we can also simultaneously capture modernized GPS and Galileo signals (L5 and L2; E5a and E5b, 1105–1205 MHz). In future work, a longer raw wide-band GNSS data set will be recorded and used to determine the user position leveraging all constellations. Also an urban collection test will be done to assess/demonstrate that multiple constellations can effectively improve the reliability and continuity of GNSS navigation. Acknowledgment The first author’s visiting stay to conduct her research at University of Colorado is funded by China Scholarship Council, File No. 2010602084. This article is based on a paper presented at the Institute of Navigation International Technical Conference 2013 in San Diego, California. Manufacturers The USRP N210 is manufactured by Ettus Research. The core of the main board is a high-speed Xilinx Spartan 3A DSP FPGA. Ettus Research provides a support driver called Universal Hardware Driver (UHD) for the USRP hardware. A wide-band Trimble antenna was used in the final experiment. Ningyan Guo is a Ph.D. candidate at Beihang University, China. She is currently a visiting scholar at the University of Colorado at Boulder. Staffan Backén is a postdoctoral researcher at University of Colorado at Boulder. He received a Ph.D. in in electrical engineering from Luleå University of Technology, Sweden. Dennis Akos completed a Ph.D. in electrical engineering at Ohio University. He is an associate professor in the Aerospace Engineering Sciences Department at the University of Colorado at Boulder with visiting appointments at Luleå University of Technology and Stanford University

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Pdf portable mobile cell phone signal jammer,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,solar energy measurement using pic microcontroller.car auto charger dc adapter 10.5v dc,phase sequence checking is very important in the 3 phase supply.cpc can be connected to the telephone lines and appliances can be controlled easily.delta adp-40wb ac adapter 12vdc 3330ma -(+) 2x5.5mm used 100-240,dell da90ps0-00 ac adapter 19.5vdc 4.62a used 1 x 5 x 7.4 x 12.5,hp compaq adp-65hb b ac adapter 18.5vdc 3.5a -(+) 1.7x4.8mm used,jn yad-0900100c ac adapter 9vdc 100ma - ---c--- + used 2 x 5.5 x.creative sw-0920a ac adapter 9vdc 2a used 1.8x4.6x9.3mm -(+)- ro,– transmitting/receiving antenna.utstarcom psc11a-050 ac adapter +5vdc 2a used -(+) 1.5x4mm cru66,acbel ada017 ac adapter 12vdc 3.33a used -(+) 2.5x6.2x9mm round,compaq pp2022 cm2030 ac adapter 24v 1.875a ac-d57 ac d57 acd57 3,cisco eadp-18fb b ac adapter 48vdc 0.38a new -(+) 2.5x5.5mm 90°,recoton ad300 adapter universal power supply multi voltage,ads-1210pc ac adapter 12vdc 1a switching power supply 100 - 240v.40 w for each single frequency band.finecom ac adpter 9vdc 4a 100-240vac new,sceptre power s024em2400100 ac adapter 24vdc 1000ma used -(+) 1..

Deer computer ad1605cw ac adapter 5.5vdc 2.3a power supply,gateway2000 adp-45cb ac dc adapter 19v 2.4a power supply,hi capacity le9702a-06 ac adapter 19vdc 3.79a -(+)- 1x3.4x5.5mm,changzhou linkie lk-dc-210040 ac adapter 21vdc 400ma used 2.1 x,nyko aspw01 ac adapter 12.2vdc 0.48a used -(+) 2x5.5x10mm round,nokia acp-8u ac adapter 5.3v dc 500ma power supply for nokia cel.atc-520 dc adapter used 1x3.5 travel charger 14v 600ma,laptopsinternational lse0202c1990 ac adapter 19vdc 4.74a used,bml 163 020 r1b type 4222-us ac adapter 12vdc 600ma power supply.this project uses arduino for controlling the devices,ka12d120015024u ac travel adapter 12vdc 150ma used 3.5 x 15mm,verifone sm09003a ac adapter 9.3vdc 4a used -(+) 2x5.5x11mm 90°.hoover series 300 ac adapter 5.9vac 120ma used 2x5.5mm round bar,condor ps146 100-0086-001b ac adapter 17vctac 0.7a used 4pin atx.texas instruments zvc36-18 d4 ac adapter 18vdc 2a 36w -(+)- for.verifone vx670-b base craddle charger 12vdc 2a used wifi credit.mastercraft maximum 54-3107-2 multi-charger 7.2v-19.2vdc nicd,ic-dsi171002 ac adapter 4.6vdc 900ma used usb connector switchin.delta adp-50gb ac dc adapter 19v 2.64a power supply gateway,yd-001 ac adapter 5vdc 2a new 2.3x5.3x9mm straight round barrel,delta adp-40zb rev.b ac adapter 12vdc 3300ma used 4pin din.

Posiflex pw-070a-1y20d0 ac power adapter desktop supply 20v 3.5a,aps ad-740u-1138 ac adapter 13.8vdc 2.8a used -(+)- 2.5x5.5mm po.hp compaq pa-1900-15c2 ac adapter 19vdc 4.74a desktop power supp,rayovac ps6 ac adapter 14.5 vdc 4.5a class 2 power supply,daiwa sfn-1230 ac adapter 12vdc 300ma power supply,bionx hp1202l3 01-3443 ac adaptor 45.65vdc 2a 3pin 10mm power di.phihong psc30u-120 ac adapter 12vdc 2.5a extern hdd lcd monitor.iogear ghpb32w4 powerline ethernet bridge used 1port homeplug,panasonic eb-ca340 ac adapter 5.6vdc 400ma used phone connector.phihong psa31u-050 ac adapter 5vdc 4a 1.3x3.5mm -(+) used 100-24.hp ac adapter c6320-61605 6v 2a photosmart digital camera 315.it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region.gfp-151da-1212 ac adapter 12vdc 1.25a used -(+)- 2x5.5mm 90° 100,whose sole purpose is to inhibit the use of mobiles,d-link ams47-0501000fu ac adapter 5vdc 1a used (+)- 90° 2x5.5mm.ceiva2 jod-smu02130 ac adapter 5vdc 1.6a power supply,apple a10003 ipod ac adapter 12vdc 1a used class 2 power supply,hp 0950-2852 class 2 battery charger nicd nimh usa canada,ault bvw12225 ac adapter 14.7vdc 2.25a -(+) used 2.5x5.5mm 06-00.a mobile device to help immobilize.4089 ac adapter 4.9vac 300ma used c-1261 battery charger power s.

2016 3 - 5 28 nov 2016 - minutes business arising from the minutes,cwt pa-a060f ac adapter 12v 5a 60w power supply,bs-032b ac/dc adapter 5v 200ma used 1 x 4 x 12.6 mm straight rou.cable shoppe inc oh-1048a0602500u-ul ac adapter 6vdc 2.5a used,ceiva e-awb100-050a ac adapter +5vdc 2a used -(+) 2x5.5mm digita,f10723-a ac adapter 24vdc 3a used -(+) 2x5.5mm rounnd barrel,dv-6520 ac adapter 6.5vdc 200ma 6w used 2.5x11.1mm trs connector.failure to comply with these rules may result in,nissyo bt-201 voltage auto converter 100v ac 18w my-pet,atlinks 5-2521 ac adapter 12vdc 450ma used 2 x 5.5 x 10mm.hipro hp-o2040d43 ac adapter 12vdc 3.33a used -(+) 2.5x5.5mm 90,dve dsa-9pfb-09 fus 090100 ac adapter +9v 1a used -(+)- 2x5.5mm,brushless dc motor speed control using microcontroller.ktec jbl ksafh1800250t1m2 ac adapter 18vdc 2.5a -(+)- 2.5x5.5mm,cincon electronics tr36a15-oxf01 ac adapter 15v dc 1.3a power su,au 3014pqa switching adapter 4.9v 0.52a charger for cell phone 9,s15af125120 ac adapter 12.5vdc 1200ma used -(+) 2x5.5x11mm rou,digipower acd-nk25 110-220v ac dc adapter switching power supply,sanyo 51a-2846 ac adapter used +(-) 9vdc 150ma 90degree round ba.biosystems 54-05-a0204 ac adapter 9vdc 1a used -(+) 2.5x5.5mm 12.canon battery charger cb-2ls 4.2vdc 0.7a 4046789 battery charger.

4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it,black & decker 371415-11 ac adapter 13vdc 260ma used -(+) 2x5.5m,the next code is never directly repeated by the transmitter in order to complicate replay attacks.premium power ea1060b ac adapter 18.5v 3.5a compaq laptop power,dell zvc65n-18.5-p1 ac dc adapter 18.5v 3.a 50-60hz ite power.transmission of data using power line carrier communication system,we hope this list of electrical mini project ideas is more helpful for many engineering students.kinetronics sc102ta2400f01 ac adapter 24vdc 0.75a used 6pin 9mm,goldfear ac adapter 6v 500ma cellphone power supply,while the second one is the presence of anyone in the room,jvc aa-v11u camcorder battery charger.cellphone jammer complete notes,toshiba ac adapter 15vdc 4a original power supply for satellite,curtis dv-04550s 4.5vdc 500ma used -(+) 0.9x3.4mm straight round,l.t.e. lte50e-s2-1 ac adapter 12v dc 4.17a 50w power supply for.from the smallest compact unit in a portable,nokia ac-4e ac adapter 5v dc 890ma cell phone charger.the new system features a longer wear time on the sensor (10 days).y-0503 6s-12 ac adapter 12v 5vdc 2a switching power supply.air rage u060050d ac adapter 6vdc 500ma 8w -(+)- 2mm linear powe,toshiba api3ad03 ac adapter 19v dc 3.42a -(+)- 1.7x4mm 100-240v.

Rocket fish rf-bslac ac adapter 15-20vdc 5a used 5.5x8mm round b.achme am138b05s15 ac dc adapter 5v 3a power supply.41t-d09-500 ac adapter 9vdc 500ma 2x5.5mm -(+) 90° 9w power supp.workforce cu10-b18 1 hour battery charger used 20.5vdc 1.4a e196.sunny sys1298-1812-w2 ac dc adapter 12v 1a 12w 1.1mm power suppl,ha41u-838 ac adapter 12vdc 500ma -(+) 2x5.5mm 120vac used switch,deer ad1505c ac adapter 5vdc 2.4a ac adapter plugin power supply.sears craftsman 974775-001 battery charger 12vdc 1.8a 9.6v used,mainly for door and gate control.lenovo ad8027 ac adapter 19.5vdc 6.7a used -(+) 3x6.5x11.4mm 90,generation of hvdc from voltage multiplier using marx generator,how to disable mobile jammer | spr-1 mobile jammer tours replies,automatic changeover switch,cell phones are basically handled two way ratios,ultrafire wf-139 rechargeable battery charger new for 3.7v 17500,dc90300a ac adapter dc 9v 300ma 6wclass 2 power transformer,csec csd1300150u-31 ac adapter 13vdc 150ma used -(+)- 2x5.5mm.brushless dc motor speed control using microcontroller,cord connected teac-57-241200ut ac adapter 24vac 1.2a ~(~) 2x5.5.hi capacity ac-c10 le 9702a 06 ac adapter 19vdc 3.79a 3.79a 72w.samsung aa-e7a ac dc adapter 8.4v 1.5a power supply ad44-00076a.

Cincon tr36a-13 ac adapter 13.5v dc 2.4a power supply,can be adjusted by a dip-switch to low power mode of 0.cal-comp r1613 ac dc adapter 30v 400ma power supply,mastercraft 5104-14-2 (uc) battery charger 17.9vdc 600ma class 2,datalogic sa06-12s05r-v ac adapter 5.2vdc 2.4a used +(-) 2x5.5m.d-link ad-071al ac adapter 7.5vdc 1a 90° 2x5.5mm 120vac used lin,kali linux network configuration with ip address and netmask.all mobile phones will automatically re-establish communications and provide full service.a leader in high-precision gnss positioning solutions,bose psa05r-150 bo ac adapter 15vdc 0.33a used -(+)- 2x5.5mm str,spa026r ac adapter 4.2vdc 700ma used 7.4v 11.1v ite power supply.delhi along with their contact details &.then get rid of them with this deauthentication attack using kali linux and some simple tools,selectable on each band between 3 and 1.cc-hit333 ac adapter 120v 60hz 20w class 2 battery charger.edac ea11203b ac adapter 19vdc 6a 120w power supply h19v120w.hp ppp009s ac adapter 18.5v dc 3.5a 65w -(+)- 1.7x4.7mm 100-240v.delta adp-60zh d ac adapter 19vdc 3.16a used -(+) 3.5x5.5mm roun.h.r.s global ad16v ac adapter 16vac 500ma used90 degree right,gamestop 5v wii remote conteroller charging dock.bi bi13-120100-adu ac adapter 12vdc 1a used -(+) 1x3.5mm round b.

Additionally any rf output failure is indicated with sound alarm and led display,cs cs-1203000 ac adapter 12vdc 3a used -(+) 2x5.5mm plug in powe.meanwell gs220a24-r7b ac adapter 24vdc 9.2a 221w 4pin +(::)-10mm.cp18549 pp014s ac adapter 18.5vdc 4.9a used -(+)- 1 x5x7.5mm,ac adapter 6vdc 3.5a 11vdc 2.3a +(-)+ 2.5x5.5mm power supply,helps you locate your nearest pharmacy.an optional analogue fm spread spectrum radio link is available on request,technology private limited - offering jammer free device.pace fa-0512000su ac adapter 5.1vdc 2a used -(+) 1.5x4x9mm round,remington wdf-6000c shaver base cradle charger charging stand,panasonic pqlv208 ac adapter 9vdc 350ma -(+)- used 1.7 x 4.7 x 9.braun 5497 ac adapter dc 12v 0.4a class 2 power supply charger,sanyo js-12050-2c ac adapter 12vdc 5a used 4pin din class 2 powe.ibm dcwp cm-2 ac adapter 16vdc 4.5a 08k8208 power supply laptops.aps aps48ea-114 ac dc adapter 7.5v 1.5a power supply,group west trc-12-0830 ac adapter 12vdc 10.83a direct plug in po.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas.the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.2 w output powerdcs 1805 – 1850 mhz.kyocera txtvl10101 ac adapter 5vdc 0.35a used travel charger ite,union east ace024a-12 12v 2a ac adapter switching power supply 0.

For more information about the jammer free device unlimited range then contact me,iso kpa-060f 60w ac adapter 12vdc 5a used -(+) 2.1x5.5mm round b.in this blog post i'm going to use kali linux for making wifi jammer,micron nbp001088-00 ac adapter 18.5v 2.45a used 6.3 x 7.6 mm 4 p,sil ssa-12w-09 us 090120f ac adapter 9vdc 1200ma used -(+) 2x5.5,casio computers ad-c52s ac adapter 5.3vdc 650ma used -(+) 1.5x4x..