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Tom C

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Tom C last won the day on March 3 2016

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  1. Tom C

    Shell Access

    Shell access is available only in development mode (not the released product) for the WBT to ensure remains a shared environment where everyone's apps can coexist. That being said, we do have options for approved developers that provide this access on a unit by unit basis. I sent you a message with the appropriate ssh info so you can access this on the unit you have on this system. If you can't access it, please let us know.
  2. Tom C

    GPS receiver

    For clarity, I wanted to add to this that GPS can be handled in multiple ways by the WBT system. There is a GPS input antenna (active) which will allow a built in GPS receiver to decode the NMEA data as well as provide timing (1 PPS based) and improved Frequency Accuracy. This decoder will tag the recorded QVRT files with GPS position data as well, plus there are some apps like GPS Display. which will allow you to see the GPS Data. Additional, either of the tuners can be used to record the RF of a GPS signals. This is very useful for recording the GPS RF and using it on playback with other data recorded on the 2nd tuner to provide time and frequency stability when decoding the data. A Tech Note Recording/Playback of GPS Signals is available to discuss the details of doing this. GPS is a very weak signal, so the operator must take care when setting up the device on RF Recording to make sure they are in fact getting the signal they need. Please contact us with any additional questions, and one of our team can help make sure your GPS recording and playback experience goes off without a hitch.
  3. Tom C

    WBT power options

    The WBT can be powered by any power source from 8V to 24V using the main power connector. The system ships with an AC brick that will run the system from AC power (110 to 240 VAC, 50-60Hz), and a DC power cable (cigarette lighter interface). Additionally, QRC has available external battery packs that can power the system for hours if another power source isn’t available. The system can support “hot swapping” of power, to allow time to rotate batteries or to change from one power source to another without interruption or having to power on/off the system.
  4. Tom C

    Simultaneous Rx and Tx

    ​I would augment this answer with -- to use receive and transmit at the same time is require use of the API and a custom WBT App. It is not build into the default User Interface.   For information on how to get the API, please see this article:  How to get the WBT App Developer's Kit
  5. Tom C

    RF signal input to WBT

    Please see the topic "Tuner Input Differences", I believe it will answer your questions.  If not, please let us know what more you were hoping to know.  
  6. Tom C

    RF record input

    ​All completely true -- I would also add that when using the higher gain ports (or even the normal ports), you need to take care to not saturate the front end of the system (called 'clipping') thereby actually loosing the signal you're trying to measure complete.  When saturating, the unit's tuner will bink red and the screen will also show red on the 200.  In those situations, use RX Atennuation to make the signal weaker such that it can be measured.   Note that The WBT-2xx series has a ~60dB analog protection circuit, which in the case of overflow will kick in and protect the radio from damage.  Signals may still appear on screen (significantly lowered in power) but should not be relied upon.  
  7. Tom C

    Sample rate

    ​In release 2.4 (Expected early June), we anticipate that users will be able to set an effective sample rate they want in the output data independently of the collected bandwidth. This feature will allow a 10 MHz LTE signal to be sampled at 30.72MHz for digital processing of the file.   This does not mean we will not, as discussed by Gene, over sample the input signal at the A/D even in this case.  Rather, it means we'll allow the user control of the logged sample rate in the file and in the API streams and not necessarily all the behind the scenes processing that generates it.  The goal of the WBT is to make it easy to use by the 'end user', and to provide output files of the format desired with minimal the chance of error.  To make that possible, our RF engineers simplify many of the "hard" things (like amplification, mixing, and filtering) that cause problems with other radio systems to focus on getting the best possible data to the output file.  We think this is a positive value-added approach to building a Software Defined Platform, not simply releasing a Software Defined Radio.  This Tech Note: https://www.qrctech.com/Articles.asp?ID=285 may interest anyone wanting to read more about all the things the WBT takes care of "Behind the Scenes" to make the product the easy to use end-user field employable solution it is.  
  8. Tom C

    The WBT's Computer

    ​ In addition to what Steve wrote, the processor itself used on the WBT changes over time based on what's available, generally updating to newer/faster CPUs when it changes. As of today's date, the current processor being shipped on WBT systems is a dual-core processor with hyper-threading. It has 8 GBytes DDR3-1333, Intel® Core™ i7 2.4 GHz Turbo, 4MB L3 cache, with HD3000 graphics. Please feel free to contact us here or using the link above for the currently shipping CPU configuration. Note that the numbers provided by Steve are per app and enforced by the System Monitor. Should more capability be required for your solution, please contact us and we can discuss your specific needs.
  9. Tom C

    Resolution bandwidth

    Building on what Gene said, coming in releases 2.3 the RBW will be changeable by the user in "Sweep Mode", a speed optimized FFT with user settable start, stop, RBW, and statistical data based on a provided dwell time.  In release 2.4 (expected early June), ZoomFFT will be added which will allow any part of currently being collected data to be "reprocessed" to a RBW of the user's choice.  The sweeping mode will also be improved with faster sweep rates than 2.3 will provide. These two features will greatly expand upon the RBW support for app writers, which will be used by some of QRC's integration teams, as well as others, in newer versions of tools like the Spectrum Analyzer App.
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