REI MDC-900 User's Manual
Contents
1. e Sweep inside the facility in the areas where signals originated e Once an area of a room is determined to be the transmission source the MDC may be used as a probe to locate the transmitter Because of the principles above it is important to understand that to properly use the MDG it is necessary to point the MDC in all directions of possible concern It is advisable to move the MDC to different locations in the room It has been suggested that because of the microwave reflections it may be possible to completely cover a room by pointing the MDC directly at the ceiling The concept is that due to the metal in most ceiling structures there would be enough reflective effect to detect a transmitter from any location in the room This method has some merits but it is impossible to predict how reliable that it would be in all situations Therefore this method should only be used when MDC 2100 MDC 900 12 Version 4 27 Feb 08 it is absolutely necessary in order to save time A good rule of thumb is to assume that the MDC has an antenna pattern that is about 100 degrees wide In other words it is necessary to point the MDC in at least 4 different directions around the room to cover the perimeter Also the MDC should be pointed up and possibly moved around the room to cover the ceiling and down to cover the floor Furthermore if you expect a very sophisticated threat it is recommended to point the MDC into ducting above ceiling tiles and2. exceptions for the MDC 900 which does not cover the 9 to 21GHz spans Microwave signals tend to be directional therefore the MDC 2100 features an array of high gain directional antennas The MDC is compatible with the OPC interface and the OTL locator options It can function in the sweep analyze and correlation modes and includes a tripod which provides the stability needed to securely point the antennas anda swivel neck for easy positioning Figure 1 MDC 2100 MICROWAVE DOWNCONVERTER The span of frequencies from 3 to 21GHz is so broad the OSCOR cannot display them all in a single window therefore a special folding process is implemented This process folds the entire spectrum from 3 to 21GHz into twelve 1 5GHz windows Six windows may be viewed simultaneously when using OSCOR 5 0 software Figure 2 illustrates the down conversion process l MDC 2100 MDC 900 3 Version 4 27 Feb 08 MDC 900 only 6 9 21 All Numbers Antennas i 3 9 in GHz 9 15 15 21 The MDC 900 only covers the band 1 frequency range Figure 2 ILLUSTRATION OF THE MDC 2100 DOWNCONVERSION PROCESS The OSCOR version 5 0 displays up to six 1 5GHz 1500MHz windows simultaneously or the spectrum may be separated into three antenna frequency bands 3 to 9GHz 9 to 15GHz or 15 to 21GHz with two 1 5GHz windows displayed simultaneously Note The MDC 900 has a single antenna and covers the band from 3 to 9GHz Built i
3. 2100 DOWNCONVERSION PROCESG 4 FIGURE 3 OPERATIONAL FREQUENCY BANDS scssssesssseessessssesssesessvesstsssvessseeseeeen 4 FIGURE 4 INSTALLATION OF THE OEP ccssscsssscsssessssesssecessussseressuessstessseessesesseessetesseeen 5 FIGURE 5 MDCA ALL OSCOR 5 0 sssssecsssecsssessssesssecessvesseressusesstesssesssueesseessesensvesseneeseen 7 FIGURE 6A ANALYZING AN MDC SIGNAL OSCOR 4 0 sccsssessssessseessstsssetesssessstsesseeen 8 FIGURE 6B ANALYZING AN MDC SIGNAL OSCOR 5 0 secsssessssessseresstesseresssesssesesseeen 8 FIGURE 7 USING IDENTIFY TO VERIFY A SIGNAL OSCOR 5 0 ccsssesssesssssessseesseeee 8 FIGURE 8 SELECTING A SIGNAL WITH THE MDC c ssecssscsssesessesssstessseesseessneessueeseeeees 9 FIGURE 9 SELECTING THE PROPER MDC BAND AND FILTER OSCOR 4 0 10 FIGURE 10 EXAMPLES OF STORING SPANS cccscsssecssssessssesssessseessseessseesevessecessnesseees 11 FIGURE 11 ANALYZE MODE USING THE MDC OSCOR 4 0 sscsssessssessseeessseesseeseees 11 FIGURE 12 PROPER MTU ORIENTATION FOR BAND 1 3 9GHZ ccssscsssessssseesseeseeees 14 FIGURE 13 PROPER MTU ORIENTATION FOR BAND 283 9 21GHZ esesesssssesssesssees 14 na MDC 2100 MDC 900 2 Version 4 27 Feb 08 INTRODUCTION The OSCOR Microwave Downconverter option MDC 2100 expands the OSCOR s frequency range limit to 21GHz The MDC 900 extends the OSCOR s range to 9GHz Note General descriptions of the MDC 2100 in this guide may not always include
4. CONTROL area to select SWEEP Press SHIFT DATA FUNCTIONS area and EXPAND CONTROL area Notice any signals displayed Select MDCB all Use the same options discussed above Set the span to 1 5GHz Notice any signals displayed Viewing Bands 1 2 and 3 e You can view bands in any order but be sure to view all six spans e Press F4 MDC Aniz e Press F2 to toggle through each band Note all signals Viewing smaller spans After all bands have been viewed cycle through each one again Analyze all unknown signals e Position the display arrow over any signal with the rotary control CONTROL area e Press NARROW CONTROL area if you wish e Press SWEEP ANALYZE e Press NARROW if you wish Identifying signals e Press F4 ldentify see Figure 6B o Observe whether the signal moved left or right see Figure 7 o The possible frequencies will be displayed at the top left If the signal moved left it is one frequency if it moved right it is the other e Press F4 RETURN to return to the previous menu to identify all other signals e Press MENU EXIT to return to the normal menu 1500 OOM In 3 21 GHz SWEEPSese k MDG net ut 93 425Mib 1500 Gomer Sahl is Fra At pe HDCA allj SEAN He EM WIDE IMDE Aniz CONFIG Figure 5 MDCA ALL OSCOR 5 0 na MDC 2100 MDC 900 7 Version 4 27 Feb 08 ANALYZE RF STGNAL 08 04 08 t DEVIATION Show Allg 9 eee Biidenti ful EXIT Figure 6A ANALYZING AN MDC SIGNAL OSCOR
5. Filter A re MDC 2100 MDC 900 14 Version 4 27 Feb 08 MDC 2100 MDC 900 SPECIFICATIONS Specifications MDC 2100 MDC 900 Frequency Range 3 21GHz 3 9GHz Conversion output 5MHz to 3005MHz 5MHz to 3005MHz Frequency Bands of Operation Band 1 3 9GHz Band 1 3 9GHz Antenna Gain Band 2 9 15GHz Band 3 15 21GHz Show All 3 21GHz MDS Minimum Detectable Signal including receiver sensitivity antenna gain and filtering losses Input Power Weight Dim Tripod Weight Dim Usage Height Case Dimensions Size H x W x D Band 1 10 dB Band 1 10 dB Band 2 9 dB Band 3 9 dB Band 1 110 dBm Band 1 110 dBm Band 2 110 dBm Band 3 110 dBm 300 milliamps at 12 volts 150 milliamps at 12 volts All models 1 4 Ib 635 Kg 11 4 x 3 1 x 1 4in 29x8x3 5 cm 77 b 35 Kg 8 75x2 5x 1 5 in 22 2 x 6 4 x 3 8 cm 5 5in 14 cm 6 25 x 18 5 x 14 5 in 47 x 36 8 x 15 9 cm MDC 2100 MDC 900 15 Version 4 27 Feb 08 C Cd RESEARCH ELECTRONICS INTERNATIONAL Technical Bulletin 24 April 2002 For the MDC 900 and MDC 2100 This bulletin describes a calibration process to ensure the maximum technical performance for the MDC unit Technical Background Most Down converter products contain a local oscillator LO reference signal that is utilized in the down conversion process While this LO frequency is vital to the down conversion process it also creates a blind spot in the frequency spectrum that
6. OSCOR functional control For example in the OSCOR SWEEP or ANALYZE modes pressing the F1 button will toggle through all of the OSCOR inputs including the MDC 2100 frequency bands Furthermore in the SWEEP mode pressing the RECALL button will display the OSCOR available inputs including the MDC inputs Some of the other normal OSCOR functions that are impacted by the MDC 2100 are described below e Press F1 INPUT and repeat until 3 9GHz is displayed in the lower left e Press SHIFT DATA FUNCTIONS area and then EXPAND CONTROL area e Press F1 Show All once to select Show All Use the Control wheel to move the arrow to any signal you wish to analyze Press Narrow CONTROL area 2 or 3 times Press Sweep Analyze CONTROL area to select Analyze Reposition the arrow over the signal and press Narrow to center the signal Press F4 MDC Anlz See Figure 6A Press F2 3 9GHz as often as needed to select the band with your signal Press F3 Fltr A amp B to select Filter A or Filter B Select the Filter with your signal Press F4 Identify once to identify the frequency Observe which way your signal moved The possible frequencies are displayed at top left Press F4 again to return e Press MENU EXIT to return to the normal menu OSCOR Version 5 0 Operational control of the MDC is provided by the OSCOR keypad using the normal OSCOR functional contr
7. To calibrate for 12GHZ enter To calibrate for 18GHz enter 3 Press Shift and the numbers 788 to permanently store the calibration data in the OSCOR Note This calibration data is permanently stored in the OSCOR Kernel It will never need to be repeated even if the OSCOR program key is replaced The calibration process can be repeated as often as desired Also if the MDC is used with another OSCOR the calibration process must be repeated to ensure that the MDC and OSCOR are calibrated for use together The OSCOR will store only one calibration number at a time re MDC 2100 MDC 900 16
8. in any enclosed spaces in which it would be possible to place a transmitter with a high gain antenna It is highly recommended that the Show All mode of operation for the MDC 2100 be utilized MDCA all and MDCB all if using OSCOR 5 0 When a signal is detected the user can then manually select the different antenna bands and filters to further investigate the signal Or the user can simply go to the analyze mode and allow the MDC to determine the operational frequency of the transmitter Also it is not recommended to use the MDC with the OSCOR automatic mode unless the MDC directional characteristics are taken into consideration If running the OSCOR and MDC in the automatic mode take care to enable the appropriate MDC spans To maximize usage of the MDC include MDC 3 21GHz Filter A and MDC 3 21GHz Filter B in your span list For OSCOR 4 0 users set span to All Bands A amp B re MDC 2100 MDC 900 13 Version 4 27 Feb 08 Using the MTU 2100 Microwave Test Unit The MTU 2100 is designed to provide a simple test to verify that the MDC is working properly When the button is pressed on the MTU low power signals are generated at about 5 9 11 8 and 17 7GHz for 3 minutes Each transmitted signal contains a modulated tone between 900Hz and 1KHz to verify that the signal is radiating from the MTU 2100 It is important to note that the frequency transmissions from the MTU may drift slightly It should also be noted that the MTU test transmitter
9. search span for speed and accuracy Example of a Desired Frequency Recommended Implementation Span 4 6GHz 3 9GHz MDCA 1 amp MDCB 1 OSCOR 5 0 6 8GHz 3 9GHz MDCA 1 amp MDCB 1 OSCOR 5 0 5 7 5 9GHz 5 8 GHz 250MHz span 8 10GHz 3 21GHz MDCA all amp MDCB all OSCOR 5 0 13 16GHz 3 21GHz MDCA all amp MDCB all OSCOR 5 0 Figure 10 EXAMPLES OF STORING SPANS Storing a Signal in the MDC Frequency Range When a signal is stored in the OSCOR signal database only the signal frequency is stored in OSCOR memory However when the OSCOR tunes to a specific signal in the MDC frequency band 3 21GHz then the OSCOR automatically directs the MDC to the proper antenna band and filter group to maximize the signal to noise ratio and maximize the system performance An example signal is shown below Figure 11 meal YZE RF SIGNAL o8 04 08 DEVIATION Show ll 9 15GHz Filter Blldentiful EXIT Figure 11 ANALYZE MODE USING THE MDC OSCOR 4 0 To store a specific frequency 1 Ensure that the OSCOR is in the ANALYZE mode 2 Type in the desired center frequency between 3 and 21 GHz or 3 and 9GHz for the MDC 900 3 Press the STORE button 4 To review the stored frequencies simply press the RECALL button from ANALYZE mode Alternatively you may select AUTO MANUAL then MANAGE DATA then SIGNALS then EDIT MENU and pick from that list Note Frequencies are stored
10. 4 0 AHALYZE RF SIGNALA 08 06 45 LDEUIATION iow ALLIMDOB 2 Filter Eildentifuf EXIT Figure 6B ANALYZING AN MDC SIGNAL OSCOR 5 0 Sk Hose Eie LERE me MDC F 2488 248n 2 TEHAL pesi RF STGNAL 98 095 31 DEUTATION MECA w i 230 kHzJFM WIDE MDC Anlzi AHLZ FIGURE 7 USING IDENTIFY TO VERIFY A SIGNAL OSCOR 5 0 OSCOR Sweep and Analyze Modes with the MDC In the Sweep mode the cursor frequency is no longer representative of a single frequency because of the folding principle described in the introduction of this manual Therefore when the entire frequency spectrum is displayed from 3 to 21GHz MDC 2100 or 3 to 9GHz MDC 900 only the local frequency is displayed for the cursor frequency In this display it is important to note that the OSCOR is in the MDC mode and not to confuse this display with the normal RF WhipH frequency display Furthermore when selecting a single antenna band as described by Figure 3 the cursor frequency represents four different possible frequencies two if using OSCOR 5 0 and when a specific filter is selected A or B then the cursor frequency represents two different possible frequencies From the sweep mode it is impossible to tell the exact frequency of the transmitted signal Follow the sequence described in the previous paragraph to determine the exact transmitted frequency Furthermore when rolling the cursor rotary dial back and forth half of the numbers re
11. Version 4 27 Feb 08 mOoc 900 mDC 2100 OWNERS GUIDE RESEARCH ELECTRONICS INTERNATIONAL 455 Security Drive Algood TN 38506 U S A 1 931 537 6032 http www reiusa net I MDC 2100 MDC 900 1 Version 4 27 Feb 08 TABLE of CONTENTS TABLE OF CONTENTS vu em teats leeteaindidisaneeeanrmaaiiee 2 TABLE OF FIGURES sm bande Geatdeaaenieenicaniditenia 2 INTRODUC TION avse a E E 3 INSTALLING THE MDC 2100 MDC 900 wncsiisccsceccsccscsssssssascctaessssanaeseisececceernnnsecseesdannnnnive 5 OPERATIONAL CONTROL OF THE MDC c scccceeeeeeeeeeeneeeeeeeeeseesenneseeeeeeeeeeseeeaaas 6 OSCOR VERSION 400 vessie ENE a E E E ANE EEE E AE AE 6 OSCOR VERSION O sicr EE EE 6 OSCOR SWEEP AND ANALYZE MODES WITH THE MDC 00 eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetennees 8 STORING A SWEEP SPAN WITH THE MDG sccis csctcccais seatedcnsntianedesnntieataunrnitencdunedidevatebendeueaes 10 STORING A SIGNAL IN THE MDC FREQUENCY RANGE ccccceceeeeeeeeeeeeeeeeeeeaeeeseeeteaees 10 MICROWAVE TRANSMISSION CONSIDERATIONS FOR THE MDC 2100 MDC 900 12 USING THE MTU 2100 MICROWAVE TEST UNIT 0 essseeeeeeeeeneeeeeeeeeeneeetenaeeeeaes 14 MDC 2100 MDC 900 SPECIFIGATIONS usanne ditnadinediaveiiieens 15 TECHNICAL BULLETIN 24 APR 02 sacieseskeessenceserentacnesmneteauctea nitenlenmgetemneneramen acts 16 TABLE of FIGURES FIGURE 1 MDC 2100 MICROWAVE DOWNCONVERTER ssesseessseessesssevesstsssevesseeeseneen 3 FIGURE 2 ILLUSTRATION OF THE MDC
12. and the MDC down converter both have polarized antennas When using the MDC in a room environment the polarization is often not of great concern because of the depolarizing effect that occurs from reflections from the room structure However when verifying proper operation of the MDC using the MTU at a close proximity the polarization of the antennas is important To achieve the proper polarization with the high gain antennas of the MDC the following positioning should be utilized e 3 9GHz band MTU and MDC should be both horizontally oriented e 9 15GHz band MTU and MDC should be perpendicularly oriented e 15 21GHz band MTU and MDC should be perpendicularly oriented Figure 12 PROPER MTU ORIENTATION FOR TESTING BAND 1 3 9GHZ OR MDC 900 Figure 13 PROPER MTU ORIENTATION FOR TESTING BAND 2 amp 3 9 21GHZ FOR MDC 2100 ONLY Since the MDC is a very sensitive receiving device it is very possible for the MDC to detect sub harmonics from the MTU In other words when using the MTU additional signals may appear at frequencies other than the main signals of 5 9 11 8 and 17 7 GHz The best way to determine if a signal is being radiated from the MTU is to move the MTU away from the MDC and see if the signal disappears or go the analyze mode in the OSCOR and listen for the modulated tone from the MTU All signals from the MTU will contain the modulated tone The main MTU signals should all be found using
13. cannot be analyzed However the MDC and OSCOR design addresses this technical problem In order to ensure that there is not a blind spot at the LO frequency or any of it s harmonics 6GHz 12GHz 18GHz the OSCOR automatically shifts the LO frequency as it is sweeping through the frequency range near the LO frequency The ability to automatically shift the MDC LO frequency as commanded by the OSCOR is one of the primary reasons that the MDC units were designed only for use with the OSCOR Other spectrum analyzers do not contain the intelligent functions to control this function and remove blind spots created by the LO In order for this shifting process to be optimized it is necessary to calibrate the OSCOR shift command with the physical characteristics of the MDC frequency shifting process However even if the calibration process is not performed the probability for a random signal of 200KHz bandwidth to actually be located in a blind spot assuming a uniform random signal distribution is only 0 000167 Calibration Process Follow these steps to calibrate the MDC to the particular OSCOR utilized with it There is no need to connect the MDC to the OSCOR for calibration To calibrate an OSCOR to a specific MDC unit 1 Press SHIFT and the numbers 786 2 Enter the number This calibrates for 6GHz This number is unique to each MDC unit and must be obtained from REI The above calibration number is to be used with MDC 900 MDC 2100 serial number
14. d spans simply press the RECALL button from the SWEEP mode Note Further details can be found in the OSCOR Owner s Guide There are some important aspects of storing spans that should be understood If you store a specific frequency band in the MDC range for example 5 6 to 5 8GHz the MDC will also simultaneously search a parallel frequency band in the example it will also search from 6 2 to 6 4GHz You cannot store frequency spans that cross the 1 5GHz crossover points See Figures 2 and 3 for the 1 5GHz bands Therefore to search specifically from 4 to 6GHz as an example you may choose to search the 3 to 9GHz antenna band with the Group A filter to cover the range from 4 5 to 6GHz See Figure 3 And then store a range centered at 4 25GHz with a 500MHz span to cover from 4 to 4 5GHz If using OSCOR 4 0 the fastest and simplest method would be to simply cover the entire span from 3 to 9GHz with Filter A amp B selected When storing a span in memory the actual frequency limits are not displayed in the frequency span list However pressing the RECALL button will recall the span showing the stored frequency span To summarize these effects If you desire to cover a frequency span that is greater than 1 5GHz or crosses the antenna bands the best approach is always to cover the entire antenna band that MDC 2100 MDC 900 10 Version 4 27 Feb 08 includes the desired frequency span The table below provides some examples and recommended
15. in a 2 5MHz wide window span If a different span is desired the frequency should be stored as a span See previous instructions Further details can be found in the OSCOR Owner s Guide na MDC 2100 MDC 900 11 Version 4 27 Feb 08 Microwave Transmission Considerations for the MDC There are important principles and considerations to understand when dealing with microwave frequency radiators e As the frequency increases the penetration of RF signals through building materials foliage etc decreases rapidly Therefore microwave signals are considered to be a line of sight LOS communication link If you locate a microwave surveillance device the receiving station will be in the direction of the transmission antenna e Directional properties of microwave transmissions may be leveraged by the use of high gain directional antennas to create an efficient point to point RF link In addition the short wavelengths of microwave frequencies allow for decreased dimensions of such antennas These techniques result in a signal that is beamed from one location to another with very little energy wasted in unintended directions and in turn makes the RF energy more elusive in it s detection e Reflections from metal structures in a building can greatly complicate the location and detection process Furthermore these reflections tend to de polarize the transmitted signals rather quickly The MDC antennas are linearly polarized and some customer
16. n microwave filters can reduce the display even further These filters are referred to as Filter A and Filter B The Identify function allows for the determination of the frequency Below is a chart representing the display of the frequencies in response to the selected antenna and microwave filter Understanding Figure 3 is critical to understanding the OSCOR operations using the MDC 2100 and MDC 900 Note The OSCOR always super imposes the various 1 5GHz windows ANTENNA BAND Filter A Filter B Filter A amp B Not applicable for OSCOR 5 0 3 9GHz 4 5 6 3 4 5 4 5 6 3 4 5 6 7 5 7 5 9 6 7 5 7 5 9 9 15GHz 10 5 12 9 10 5 10 5 12 9 10 5 MDC 2100 only 12 13 5 13 5 15 12 13 5 13 5 15 15 21GHz 16 5 18 15 16 5 16 5 18 15 16 5 MDC 2100 only 18 19 5 19 5 21 18 19 5 19 5 21 Figure 3 OPERATIONAL FREQUENCY BANDS na MDC 2100 MDC 900 4 Version 4 27 Feb 08 Installing the MDC 2100 MDC 900 In order to use the MDC with the OSCOR a special connector the OEP 2100 must be installed in the connector tray of the OSCOR This connector should be installed permanently into the connector tray and provides for easy connection of the MDC while not affecting the OSCOR normal operation Note the step numbers on Figure 4 below to assist in the installation To install the OEP 2100 1 Turn the OSCOR off and wait at least 30 seconds before proceeding 2 Remove
17. nical Note It is possible to have a very slight shift in frequency in the down conversion process In the example below the signal shifted about 50KHz this is a minimal shift considering the signal is at 10GHz 2 FOM 477 AME s Sweep R 5SGHz Show Gilly 9 156Hz Fltr Ae EXIT Figure 8 SELECTING A SIGNAL WITH THE MDC OSCOR 4 0 Technical Note You may see false signals at 8 5 and 9GHz These are produced by an interaction of the MDC and the OSCOR You may minimize this by moving the MDC a few feet from the OSCOR and orientating the MDC metal housing towards the OSCOR nar MDC 2100 MDC 900 9 Version 4 27 Feb 08 eee REA LTine 9 15GHz Show All 9 15GHz Filter BI I EXIT Figure 9 SELECTING THE PROPER MDC BAND AND FILTER OSCOR 4 0 Storing a Sweep Span with the MDC Since the MDC down conversion process displays multiple frequency bands at once the easiest way to quickly view a specific frequency span is to type in a desired center frequency and then use the EXPAND and NARROW keys to adjust the span To store a specific frequency span 1 2 3 4 5 Ensure that the OSCOR is in the SWEEP mode and the MDC is connected Type in the desired center frequency between 3 and 21 GHz or 3 and 9GHz for the MDC 900 Adjust the frequency span using the EXPAND and NARROW keys The number in the top left corner of the OSCOR display shows the span Press the STORE button To review the store
18. ols For example in the OSCOR SWEEP or ANALYZE modes pressing the F1 button will toggle through all of the OSCOR inputs including the MDC frequency bands Furthermore in the SWEEP mode pressing the RECALL button will display the OSCOR available inputs including the MDC inputs Some of the other normal OSCOR functions that are impacted by the MDC are described below Signal identification Process Viewing the entire spectrum from 3 to 21GHz e Select MDCA all as illustrated in Figure 5 There are 4 methods you may use o Method 1 Press RECALL DATA FUNCTIONS area scroll to MDC 2100 Filter A and press RECALL or MENU VIEW SPAN then MENU MANUAL MODE o Method 2 Press AUTO MANUAL MODE area lower left by power light then F2 then F1 etc This method picks from the same menu as above o Method 3 Press F1 INPUT and repeat until you see MDCA all displayed o Method 4 Enter a frequency found in an MDCA window You must start from an OSCOR RF band not INFRARED or AC VLF o Spans are recalled with the settings last used no matter which method is used MDCA all may not initially display If MDCA 1 MDCA 2 or MDCA 3 displays press F4 MDC Anlz then F1 Show All nar MDC 2100 MDC 900 6 Version 4 27 Feb 08 o You can choose to begin with MDCB all if you wish You must view both MDCA all and MDCB all to see the entire spectrum e Set the span to 1 5GHz if necessary If a smaller span initially displays press SWEEP ANALYZE
19. presenting potential signal frequencies will be increasing while others will be decreasing This again is due to the down conversion process Furthermore often signals will have an odd shape due to the down conversion In Figure 8 a signal is selected using the OSCOR NARROW button and the OSCOR rotary dial This signal has a rather strange shape because of the folding process of the down conversion but it provides an excellent indicator for the proper signal down conversion Hence by pressing nar MDC 2100 MDC 900 8 Version 4 27 Feb 08 the F4 button to further analyze the signal it is possible to analyze which antenna and filter that is actually receiving the signal Figure 9 shows the proper antenna selected and the proper filter selected which corrects the signal shape Furthermore the unusual signal shape of Figure 8 indicates that this signal should be a Filter B signal Note The OSCOR 5 0 software will not allow this type signal to be displayed The frequency span limits are always between 0 and 3GHz This is because the OSCOR is a spectrum analyzer that covers the frequency range up to 3GHz but the input frequencies of the down converter cover 3 to 21GHz MDC 2100 or 3 to 9 GHz MDC 900 Therefore the cursor frequencies provide the possible signal frequencies while the span numbers indicated at the top right and left of the display provide the frequency span the OSCOR is actually viewing after the down conversion process Tech
20. s have had concerns that the polarization effect of the MDC antennas could cause the user to overlook a transmitter due to an incorrect polarization effect Rotating the antenna 90 degrees along the LOS axis can minimize this effect However our experience and testing indicate that this is not a problem because of the reflective nature of the metal structures in a normal building environment Sweep operations The facility you are trying to protect should be considered in relationship with its surroundings Any window or external opening should be considered a possible LOS portal for microwave radiation Nearby buildings are potential locations for receivers e Begin any sweep for microwave radiators outside the facility e Align the MDC in a LOS path between surrounding buildings and windows or openings e Direct the MDC antennas towards your facility e Operate the OSCOR in peak display mode traces for a specific time e If devices signals are detected note the area of the facility where the signals originated Signal strength will be greatest when directional MDC antennas are aligned along an LOS path and the antenna s polarity matches the transmitter e If devices signals are detected and determined to not be continuous wave signals run traces again and again for shorter and shorter times In this way you can determine the time between transmissions This methodology is crucial for detecting devices using burst or packet transmitters
21. the OEP from the packaging and insert the mini din connector OSCOR EXP into the EXPANSION PORT of the OSCOR as shown in Figure 4 You may have to unplug the two tape recorder cables labeled REMOTE OUT RECORDER Insert the metal support bar into the connector tray Align the depression at the center of the bar with the screw head at the top of the OEP The cables that provide connection to the tape recorder controls must be placed under the metal support 4 Use the hex wrench to tighten the two hex screws This holds the OEP in place 5 Unplug the HF UHF BNC connector from the OSCOR and plug it into the OEP at the ANTENNA PANEL RF jack 6 Connect the OEP BNC cable HF UHF INPUT to the OSCOR HF UHF INPUT w To install the MDC 2100 or MDC 900 1 Plug the MDC BNC connector into OEP BNC jack MDC RF 2 Plug MDC mini din connector into the MDC POWER CTRL jack 3 Utilize the OSCOR keypad to control the MDC Figure 4 INSTALLATION OF THE OEP The MDC can be used in a stationary position sitting on the provided tripod or it can be moved around the environment to provide a thorough sweep of the area For best operation the MDC should be located at least three feet away from the OSCOR Position the metal housing towards the OSCOR na MDC 2100 MDC 900 5 Version 4 27 Feb 08 Operational Control of the MDC 2100 MDC 900 OSCOR Version 4 0 Operational control of the MDC 2100 is provided by the OSCOR keypad using the normal
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