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Prepared by JD Bruffy, CEO, DBK COM LTD.

LP Technologies, Inc

 LPT 3000R

Spectrum Analyzer

Distributed by DBK Communications Ltd.

Westminster, Colorado

 The following illustrates the versatility of the LPT 3000R rack mount spectrum analyzer with a range from 9 KHz to 3 GHz.  As use as a site monitor of transmission and receive equipment it is invaluable and the price makes it very practical.  The unit has 4 inputs, 1 looping and 3 terminated permitting a wide selection of sources.

 I have operated the system via an EVDO card from the floor of different shows and mobile environments.  The analyzer software is resident on the computer that you have in use; thereby, making the data circuit between the unit IP address and your specific computer and very small band width requirement.  I have left the system on for several hours through out the course of the day without encountering any problems or loss of data connectivity. 

This particular setup of the LPT 3000R demonstrates some of the useful properties and possible applications of the analyzer working as a remote monitor of the general spectrum witnessing off air transmitter performance and possible interference issues.  This particular configuration monitors DTV signals, FM broadcast, Ku signals, and GPS signals to name a few.

The unit is configured as follows:

SW-1 = Horizontal poled consumer antenna on the top of the shop directed toward Lookout mountain, and Mt Morrison area of Denver, Co.

            SW-2 = Vertical pole position of the same observation as SW-1.

            SW-3 = LNB output of a Ku antenna located at my shop in Arvada, CO

            SW-4 = GPS antenna output located at my shop.

 

FIRST . . .

You will need to download the software from the LP Technologies site and the National Semiconductor software.  The following links will help with this task.

LPT site is http://www.lptech.com/LPT-3000R_Support1.html  (Ver 1.2.18 is the most current as of this writing.

VISA RUNTIME software http://www.lptech.com/LPT-3000R_Support.html .

NOTE: install the VISA runtime first and then the LPT software.

After the installation of the software you will need to provide the password (0000) the first time after booting up the software.  When you purchase your own unit you can change the PW for you needs.  The IP address that you will put in the block when asked is, 65.100.131.247, the Port 5000 should be already inserted, but incase it isn’t . . . you know have it. 

Many of the following demonstrations are self explanatory by observation of the analyzer settings.  I have relabeled the SW settings for my software.   You will see them as SW-1 through SW-4 respectively.

NOTE: SW 1, 2 are off-air and would be very accurate from a site directional coupler on your transmitter.

 

Text Box: Broadcast DTV, Channel 9 Center = 189.00MHz Vertical = 10 dB Reference = -30 dB Average = ON Span = 10 MHz Markers = ON ALL             1 = Center Freq. 189.00MHz             2 = Pilot Carrier             3 = -3 MHz             4 = +3 MHz

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 This is the off air signal from channel 9 in Denver, CO.  The antenna is a consumer antenna, horizontally poled.  The accuracy can be exact when using the directional coupler feeding the antenna at the transmitter plant.

 

Text Box: Broadcast DTV, Channel 7 and 9 Center = 183.00MHz Vertical = 10 dB Reference = -30 dB Average = ON Span = 20 MHz Markers = ON ALL             1 = Center Freq. 183.00MHz             2 = Pilot Carrier Ch 7             3 = Pilot Carrier Ch 9             4 = Center of Ch 9, ref to marker 1

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 Channels 7 and 9 use the same transmit antenna at the new facility on Look Out Mountain. 


 

Text Box: Broadcast FM and IBOC 105.9 MHz Center = 105.90 MHz Vertical = 5 dB Reference = -50 dB Average = ON Span = 500 KHz Markers = ON ALL             1 = Center Freq. 105.30MHz             2 = Lower channel edge             3 = Upper channel edge             4 = Lower analog carrier edge

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 This demonstrates some of the FM measurements capable.  The accuracy would be verifiable for FCC measurements if taken from a directional coupler feed the transmit antenna.


 

Text Box: Ku Satellite reception (SW-3), output of LNB Center = 1.200 GHz Vertical = 5 dB Reference = -40 dB Average = ON Span = 550 MHz Markers = ON ALL             1 = Center Freq. 1.200 GHz             2 = Lower edge of first transponder             3 = Upper edge of last transponder             4 = NOT USED

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 This is a standard Ku consumer antenna used by either Direct TV or Dish network.  The LNB is powered by a bias Tee with 12VDC and the output feed directly to the LPT 3000R input SW 3.  The complete satellite is seen counting 16 transponders.  Changing the input voltage will produce the opposite pole. 


 

Text Box: Ku Satellite, Single transponder, output of LNB Center = 973.625 MHz Vertical = 2 dB Reference = -56 dB Average = ON Span = 50 MHz Markers = ON ALL             1 = Center Freq. 973.625 MHz             2 = Lower transponder edge             3 = Upper transponder edge             4 = Start of adjacent transponder

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 This is the first transponder on a single pole reference of the Ku satellite.


 

Text Box: GPS antenna, signal for timing and frequency   Center = 1.575,420 Vertical = 2 dB Reference = -94 dB Average = ON Span = 50 MHz Markers = ON DELTA             1 = Center Freq. 1,575.42MHz             2 = Possible interference source

 

 

  

 

 

 


 

The GPS shown is the one that we use for timing and frequency control of slaved oscillator equipment.  The timing area even though it is a very broad signal, the main area on concern is approximately +/- 1 MHz of the center frequency of 1575.42 MHz.  Other possible interference components are present and can be seen for further investigation if needed.  The pulse seen with M2 placed on it is generated out of one of my computers in the shop, but it is far enough out of the area not to interfere with the signal needed to slave my local GPS standard.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Text Box: Broadcast ATSC, Channel 9, 189.00 MHz   Center = 189.00MHz Vertical = 10 dB Reference = -35 dB Average = ON Span = 10 MHz Markers = OFF DTV Mask = ON

 

 

  

 

 

 

 

 

 

 


 

This is the DTV mask measurement use the new software V1.18.  The software for the unit is in a constant state of evolution due to customer requirements.  This further demonstrates the flexibility and satisfaction of future use and the lack of planned obsolescence.

 

Text Box: MediaFLO, Channel 55, 719 MHz   Center = 719.00MHz Vertical = 2 dB Reference = -63 dB Average = ON Span = 10 MHz Markers = ON ALL             1 = Center Freq. 719.00MHz             2 = -3 MHz (upper channel -16.63 dB)             3 = +3 MHz (lower channel -17.61 dB)             4 = Peak find indicating +.83 dB above Fc.

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 This is the PBS talk radio with Digital service of the Classical radio broadcast.

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These are a few of the measurements taken for demonstration.  These were taken via my laptop at my home office in Westminster.  These were also demonstrated on the floor at NAB 2009 in the LP Tech booth using an EVDO card provided by Verizon wireless.

The software is in a constant state of evolution and updates are posted to the LP Tech website.  We also have other 3rd party software providers depending on you application.  If you need something more specific the National Semiconductor website has the VISA runtime software for developers.

For further information or demonstration contact:

            John Bruffy, DBK Com Ltd. jdb@dbkcom.com  303.952.4504 Office

We look forward to preparing a quote to supply your needs.

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Last modified: August 12, 2010