Test Report

FCC ID: EO940GN-1

Test Report

Download: PDF
FCCID_6967

                                               FCC ID: EO940GN-1




                       TEST REPORT



                      Equipment Tested:

                   Utility Meter Transceiver
                          Model 40GN
                   Serial Number GN980819




                      Itron Test Facility
                    2401 North State Street
                   Waseca, Minnesota 56093




Report # W980831                                   Page 1 of 17


                                                                                                                                                                    FCC ID: EO940GN-1



                                                                    TABLE OF CONTENTS

1. TEST SUMMARY ..............................................................................................................................................................................3

2. PRODUCT DESCRIPTION AND TEST OBJECTIVE ..................................................................................................................4

3. TEST FACILITY .....................................................................................................................................................................................4

4. EUT SUPPORT EQUIPMENT USED .......................................................................................................................................................4

5. EUT SYSTEM DESCRIPTION.........................................................................................................................................................4

6. OPERATING MODE OF EUT, SOFTWARE/FIRMWARE ETC ................................................................................................5

7. TEST SETUP DIAGRAM ..................................................................................................................................................................6

8. TEST AND MEASUREMENT EQUIPMENT DETAIL.................................................................................................................7

9. AMBIENT CONDITIONS DURING TEST .....................................................................................................................................7

10. DISTRIBUTION LIST .....................................................................................................................................................................7

11. REFERENCES ..................................................................................................................................................................................7

12. DESCRIPTION OF TEST PROCEDURE ..................................................................................................................................................8
    RADIATED EMISSIONS ...........................................................................................................................................................................8
13 RESULTS...............................................................................................................................................................................................8
    TRANSMITTER RADIATED EMISSIONS ..................................................................................................................................................9
    RECEIVER RADIATED EMISSIONS ......................................................................................................................................................10
ATTACHMENT A .....................................................................................................................................................................11, 12, 13
    RADIATED EMISSIONS-TRANSMITTER ...............................................................................................................................................11

    RADIATED EMISSIONS- RECEIVER ...............................................................................................................................................12, 13
ATTACHMENT B .................................................................................................................................................................................14
    CONVERSION FROM INSTANTANEOUS PEAK POWER TO AVERAGE POWER .....................................................................................14
ATTACHMENT C .................................................................................................................................................................................15
    PART 15.31(M) MEASUREMENT OF RELATIVE FIELD INTENSITY ...................................................................................................15
ATTACHMENT D .................................................................................................................................................................................16
    PULSE DESENSITIZATION OF THE SPECTRUM ANALYZER ................................................................................................................16
ATTACHMENT E .................................................................................................................................................................................17
    PHOTOGRAPH (TEST SETUP) ..............................................................................................................................................................17




Report # W980831                                                                                                                                                               Page 2 of 17


                                                                  FCC ID: EO940GN-1



1. TEST SUMMARY

      Test Report No.:             W980831

      Company:                     Itron, Inc.

      Requester:                   Klaus Bender

      Phone:                       (509) 891-3323

      Test Date(s):                August 26, 27, 28 & 31, 1998

      Equipment Under Test:        Utility Meter Transceiver

      General Test Summary:        The 40GN ERT® transmitter was tested for
                                   compliance to FCC Part 15.249 requirements for an
                                   intentional radiator. The receiver was tested for
                                   compliance to FCC Part 15.109.

      Original Grant or
      Permissive Change:           Original Grant

      Certification Status:        The 40GN ERT transmitter has been verified as
                                   being compliant with the FCC Part 15.249
                                   requirements for an intentional radiator.
                                   The receiver has been verified as being compliant
                                   with the FCC Part 15.109 requirements for
                                   receivers.

      Modifications
      Necessary for Compliance:    None. See Section 2. For EUT description.




      Tested By: Robert A. Sleen   Report Written By: Robert A. Sleen




Report # W980831                                                        Page 3 of 17


                                                                                           FCC ID: EO940GN-1



2. PRODUCT DESCRIPTION AND TEST OBJECTIVE

      The EUT is an utility meter transceiver and is used in conjunction with a host meter to measure natural
      gas consumption. The EUT transmits consumption data if the receiver detects a wake-up tone. (See
      Sections 6 and 7 for test set-up description). The 40GN ERT® has a wide band receiver centered at 955
      MHz. The actual fundamental receiver frequency is set at the time of manufacture. The unit also has a
      frequency-hopping transmitter that operates over a maximum 6 MHz bandwidth in the 910-920 MHz
      band (the actual fundamental frequency is set at the time of manufacture). The objective of this test is to
      determine if the EUT transmitter meets the radiated emission levels established by FCC Part 15.249 for
      intentional radiators and to determine if the EUT receiver meets the radiated emission levels established
      by FCC Part 15.109 for unintentional radiators. The EUT was tested at an antenna to EUT distance of 3
      meters according to ANSI C63.4-1992.


3. TEST FACILITY
      The tests were performed at the test facility of Itron, Inc. located at 2401 North State Street, Waseca,
      Minnesota 56093. This site is fully described in a document submitted to the FCC and accepted in a
      letter dated June 12, 1996 (Ref.: 31040/SIT 1300F2).


4. EUT SUPPORT EQUIPMENT USED:

        Test Equipment            Model        Manufacturer        Serial. No.     Radiated or      Cal.
                                                                                   Conducted        Due
                                                                                      EMI
     RF Signal Generator          8656A           Hewlett         2341A05541         R&C            N/A
                                                  Packard
     Function Generator             171           Wavetek          M6230187           R&C           N/A
     Double Ridged Guide           3115           EMCO             9508-4550          R&C           N/A
     Antenna



5. EUT SYSTEM DESCRIPTION:
      The EUT was physically configured similar to a typical user configuration. The EUT was placed in the
      center of the test table 80 cm above the ground plane.
      There were no associated components or accessories on the table during the radiated emissions tests.




Report # W980831                                                                                 Page 4 of 17


                                                                                       FCC ID: EO940GN-1



6. OPERATING MODE OF EUT, SOFTWARE/FIRMWARE ETC. :
      The EUT was operationally configured to a special test mode. This special test mode causes the ERT® to
      transmit consecutive messages, thus allowing peaks of transmitter radiation to be more easily found as
      antenna heights and turntable azimuth are varied.
      The hopping bandwidth of the transmitter is in the range of 1.5 to 6.0 MHz including manufacturing and
      component variability.
      See Attachment B for message detail.

      The receiver was under normal operation (a 0.3 usec. maximum wide on-time pulse occurring at a 512
      HZ rate).


      See the test set-up diagram in Section 7 and the photos in Attachment E.




Report # W980831                                                                             Page 5 of 17


                                                                                    FCC ID: EO940GN-1



7. TEST SET-UP DIAGRAM:




              EUT                                     3 M.                                       Mast

                                    Styrofoam
                                      Block
    80 cm                                                     Roberts Dipole,
                                                              Bi - conical, and
                                                              Log Periodic antennae
                                                              below 1 GHz.
                                                              Double Ridged Guide antenna
                                                              above 1 GHz.


                                                                              [1]
                                                                           HP 8656A
                                                                          RF Sig. G en.



                                                                          Wavetek
                                                                          Model 171
                                                                                          32.5 Hz.
                   Power
                   Supply


              Spectrum
                                                        [2]
              Analyzer


                                                                     [1] W ake up = 952 MHz. M od.
                                                                         by 32.5 Hz. @ 95 % AM

                                                                     [2] Indicates a change in
                                              [2]                        connection, not an actual
               Sweep                                                     switch.
                            10 dB                     40 dB
              Generator

                            Coax                    Reference Level Set
                   Power
                   Meter




Report # W980831                                                                          Page 6 of 17


                                                                                     FCC ID: EO940GN-1



8. TEST AND MEASUREMENT EQUIPMENT DETAIL:

         Test Equipment          Model         Manufacturer         Serial     Radiated or      Cal
                                                                   Number      Conducted        Due
                                                                                  EMI
     Spectrum Analyzer         141T          Hewlett-Packard     1337A-08156       R           01/99
     Display Section
     RF Section                8555A         Hewlett-Packard     1429A04027       R            01/99
     IF Section                8552A         Hewlett-Packard     1410A06719       R            01/99
     Spectrum Analyzer         8593E         Hewlett-Packard     3543A02032       R            04/99
     LISN                      3825-2        EMCO                9605-2535       R&C           03/99
     Sweep Generator           8350B         Hewlett-Packard     2722A08843      R&C           05/99
     RF Plug-In                83592A        Hewlett-Packard     2252A00787      R&C           05/99
     Power Meter               437B          Hewlett-Packard     3125U16900      R&C           03/99
     Power Meter Sensor        8481D         Hewlett-Packard     331BA11513      R&C           03/99
     Amplifier < 5 GHz         ZHL - 1042J   Mini-Circuits       H110894-008      R             N/A
     Amplifier > 5 GHz         JCA010-415    JCA                 103              R             N/A
     Power Supply              6201B         Hewlett-Packard     1145A03611       R            12/98
     Antenna - Dipole          Roberts       Compliance Design   19570            R            12/98
     Antenna -                 3115          EMCO                9205-3878        R            03/99
         Double Ridged Guide
     Antenna - Log periodic    3108          EMCO                9203-2455         R           03/99
     Antenna - Bi-conical      3146          EMCO                9203-3358         R           03/99



9. AMBIENT CONDITIONS DURING TEST:

                                 Date        Temp ( °F )   Humidity ( % RH )
                               08/26/98         77                51
                               08/26/98         76                56
                               08/26/98         72                80
                               08/26/98         71                91
                               08/27/98         71                89
                               08/27/98         70                97
                               08/28/98         75                67
                               08/31/98         68                70


10. DISTRIBUTION LIST:                    Klaus Bender
                                          Emmy Nickolson
                                          Archive

11. REFERENCES:                           ANSI C63.4-1992




Report # W980831                                                                             Page 7 of 17


                                                                                          FCC ID: EO940GN-1



12. DESCRIPTION OF TEST PROCEDURE
      12.1 Radiated Emissions (Transmitter and Receiver)

      These tests measure the transmitter radiated emissions and the receiver radiated emissions using a
      spectrum analyzer and receiving antenna. During testing the EUT was placed on a non-conducting
      support, 80 cm above the ground plane. The RF spectrum was scanned from 30 MHz to 1000 MHz
      using the Bi-conical and Log Periodic antennae. A Double Ridged Guide antenna was used from 1 GHz
      to the product’s tenth harmonic of the transmitter (9.1315 GHz) and 5 GHz on the receiver. Levels
      below 1 GHz were measured with the spectrum analyzer resolution bandwidth at 120 kHz and levels at
      or above 1 GHz were measured with the spectrum analyzer resolution bandwidth at 1 MHz for the
      transmitter and 1 MHz for the receiver. The receiver harmonics were also checked with the spectrum
      analyzer at the following settings: Resolution Bandwidth = 1 MHz; Video Bandwidth = 10 Hz and Span
      = 0 Hz. The emissions were measured with vertical and horizontal antenna polarizations. The antenna
      height was varied from 1-4 meters and the EUT was rotated from 0-360°. Maximum emissions were
      recorded. The antenna to EUT test distance was 3 meters horizontally. An analog spectrum analyzer
      was used as an aid in locating the maximum radiation emission as the EUT orientation and antenna
      position were varied. The level was determined on the HP8593E by means of signal substitution.
      Testing was performed according to the procedures in ANSI C63.4-1992.

13. RESULTS
      13.1 Radiated Emissions (Transmitter and Receiver)

      Final emission levels are expressed in dBuV/m. This level is determined by converting the reading from
      the spectrum analyzer or power meter to dBuV and adding the antenna correction factor (dB) and cable
      loss (dB) to it. The amplifier gain is accounted for when the spectrum analyzer display is calibrated.
      Antenna and cable loss factors are included in the tabular results contained in Attachment A. All levels
      below 1 GHz are quasi-peak with the exception of the transmitter fundamental. The transmitter
      fundamental is expressed in peak level as it is below the quasi-peak limit. Transmitter final levels of
      frequencies above 1 GHz are peak average with a 20 dB relaxation allowed for duty cycle.


      Refer to Attachment B for duty cycle calculation.
      Refer to Attachment E for pulse desensitization of the spectrum analyzer calculations.




Report # W980831                                                                               Page 8 of 17


                                                                                                  FCC ID: EO940GN-1



        13.1.1 Transmitter Radiated Emissions


RULE:                        Part 15.249: Emission of RF Energy - Transmitter
STANDARD:                    Part 15.33 (a)(1) Frequency range of the radiated measurements:
                             Tenth harmonic of the highest fundamental frequency.
                             Part 15.249
                             Field Strength of Fundamental Frequency: 50,000 uV/m (94 dBuV/m)
                             Field Strength of Harmonic Radiation: 500 uV/m (54 dBuV/m)

                             Field Strength of Spurious Radiation:

                             Part 15.249(c):
                             Emissions radiated outside the specified frequency bands, except for harmonics,
                             shall be attenuated by at least 50 dB below the level of the fundamental or to the
                             general radiation limits in 15.209, whichever is the lesser attenuation.

                             Part 15.209
                             Except as provided elsewhere in this subpart, the emissions from an intentional
                             radiator shall not exceed the field strength levels specified in the following table:

                             Frequency of Emission                   Field Strength        Field Strength


                                     (MHz)                               (uV/m)            (dBuV/m)
                                      30-88                                100                 40
                                     88-216                                150                43.5
                                    216-960                                200                 46
                                   Above 960                               500                 54

TEST RESULTS:                The EUT transmitter radiated emissions met the requirements established by
                             FCC Part 15.249 for intentional radiators. The EUT was tested from
                             30 MHz to the transmitter’s 10th harmonic (9.1315 GHz). No EUT transmitter
                             emissions other than the fundamental at 913.15 MHz were detected in the range
                             from 30 MHz to 1 GHz.

                             The transmitter fundamental (913.15 MHz) was measured to be 88.6 dBuV/m
                             peak. This is 5.4 dB below the quasi-peak limits established by Part 15.249.
                             The worst case harmonic radiated emission was determined to be 72.9 dBuV/m
                             peak. The limit established by Part 15.249 and Part 15.35 (b) is 74 dBuV/m
                             (conversion of instantaneous peak power to average power allows an additional 20
                             dB relaxation). The result is a margin of 1.1 dB.


                             In compliance with FCC Part 15.35 (b), conversion of instantaneous peak
                             power to average power is addressed in Attachment B.


Report # W980831                                                                                         Page 9 of 17


                                                                                       FCC ID: EO940GN-1




TEST DATA:               Refer to Attachment A for detailed test results
                         Refer to Attachment C for Part 15.31 (m); Measurement of Relative Field
                         Intensity at the High and Low Frequencies of the EUT.

13.1.2 Receiver Radiated Emissions

RULE:                    Part 15.109: Radiated Emission Limits


STANDARD:                Part 15.33 (b)(1)
                         The upper frequency of measurement range: 5000 MHz.


                         Part 15.109 (a)
                         The field strength of radiated emissions from unintentional radiators at a distance
                         of three meters shall not exceed the following values:


                         Frequency of Emission               Field Strength      Field Strength
                                (MHz)                            (uV/m)         (dBuV/m)
                                  30-88                            100              40
                                 88-216                            150             43.5
                                216-960                            200              46
                               Above 960                           500              54

TEST RESULTS:            The EUT receiver radiated emissions met the levels established by FCC Part
                         15.109 (a) requirements for receivers.
                         The EUT was tested from 30 MHz to 5000 MHz.

                         The receiver fundamental (950.7 MHz) was determined to be 36.4 dBuV/m
                         quasi-peak. The limit established by Part 15.109 (a) is 46 dBuV/m. No EUT
                         receiver emissions other than the fundamental at 950.7 MHz were detected in the
                         range from 30 MHz to 1 GHz.

                         The receiver second harmonic was determined to be 39.3 dBuV/m.

                         Duty cycle calculation for Pulsed RF per FCC Part 15.35 (b) is addressed in
                         Attachment B.


TEST DATA:               Refer to Attachment A for detailed test results




Report # W980831                                                                              Page 10 of 17


                                                                                                          FCC ID: EO940GN-1



                                                     ATTACHMENT A

EUT:                 Encoder/Receiver/Transmitter                          FCC Part 15.249
Model :              40GN                                                  Radiated Emissions-Transmitter
Serial No.:          GN980819                                              Test Dates:       August 26, 27, 28 & 31, 1998
                                                                           Engineer:         Robert A. Sleen
                                                                             [2] [3]            Duty       [4]
                                                        Ant.      Cable    Corrected           Cycle      Final
  Freq.       Ant.     Level                 Level     Factor     Loss       Level     Limit   Factor     Limit    Margin
  MHz         Pos.     dBm         [1]       dBuV       dB         dB       dBuV/m dBuV/m        dB     dBuV/m        dB

 913.15        V       -42.8        P        64.2       22.8        1.6       88.6        94                    94         5.4
 913.15        H       -48.6        P        58.4       22.8        1.6       82.8        94                    94        11.2

 1826.3        V       -69.3        P        37.7       28.1        2.5       68.3        54        -20         74         5.7
 1826.3        H       -73.8        P        33.2       28.1        2.5       63.7        54        -20         74        10.3

 2739.5        V       -68.4        P        38.6       30.7        3.1       72.4        54        -20         74        1.6
 2739.5        H       -67.9        P        39.1       30.7        3.1       72.9        54        -20         74        1.1

 3652.6        V       -91.3        P        15.7       32.9        3.6       52.2        54        -20         74        21.8
 3652.6        H       -82.1        P        24.9       32.9        3.6       61.5        54        -20         74        12.6

 4565.8        V       -79.8        P        27.2       34.5        4.1       65.8        54        -20         74         8.2
 4565.8        H       -82.6        P        24.4       34.5        4.1       63.0        54        -20         74        11.0

 5478.9        V       -85.4        P        21.6       36.0        5.0       62.7        54        -20         74        11.3
 5478.9        H       -91.8        P        15.2       36.0        5.0       56.2        54        -20         74        17.8

 6392.1        V       -90.3        P        16.7       36.9        5.4       59.1        54        -20         74        15.0
 6392.1        H       -94.1        P        12.9       36.9        5.4       55.3        54        -20         74        18.7

 7305.2        V       -95.6       NF        11.4       38.0        6.2       55.6        54        -20         74
 7305.2        H       -95.6       NF        11.4       38.0        6.2       55.6        54        -20         74

 8218.4        V       -96.1       NF        10.9       38.8        6.0       55.7        54        -20         74
 8218.4        H       -96.1       NF        11.0       38.8        6.0       55.8        54        -20         74

 9131.5        V       -93.8       NF        13.2       39.8        7.0       60.0        54        -20         74
 9131.5        H       -93.8       NF        13.2       39.8        7.0       60.0        54        -20         74


Notes:    [1] QP = Quasi-peak, P = Peak, NF = Noise Floor of the Spectrum Analyzer
          [2] The Spectrum Analyzer settings are as follows:
              Fundamental - Resolution Bandwidth = 120 kHz; Video Bandwidth = 300 kHz; Span = 10 MHZ.
              Harmonics - Resolution Bandwidth = 1 MHz; Video Bandwidth = 3 MHz; Span = 50 MHZ.
          [3] "Corrected Level" numbers in bold are RF signal levels.
              "Corrected Level" numbers in italics are noise floor and as such indicate that there is no RF signal at that level.
              The "Antenna Correction Factor" and the "Cable Loss" have been factored in with the noise floor levels in
              order to demonstrate what the "Corrected Level" of an RF signal at the noise floor level would have been equal to.
          [4] The "Final Limit", in the case of the harmonics, represents 20 dB above the average limit in FCC Part 15.249
              Refer to Attachment B (Part 15.35 (b)).



Report # W980831                                                                                                Page 11 of 17


                                                                                                            FCC ID: EO940GN-1




EUT:                       Encoder/Receiver/Transmitter            FCC Part 15.109
Model :                    40GN                                    Radiated Emissions-Receiver
Serial No.:                GN980819                                Test Dates:           August 26, 27, 28 & 31, 1998
                                                                   Engineer:             Robert A. Sleen
                                                                                             [2]          [3]
                                                                      Ant.       Cable      Final        Final
   Freq.          Ant.        Level                      Level       Factor       Loss      Level        Limit       Margin
   MHz            Pos.        dBm            [1]         dBuV          dB          dB      dBuV/m       dBuV/m        dB

   950.7           V                         QP           11.3         23.4          1.7         36.4           46           9.6
   950.7           H                         QP            3.2         23.4          1.7         28.3           46          17.7

  1901.4           V           -98.6         P             8.4         28.4          2.5         39.3           74          34.7
  1901.4           H           -95.0         NF           12.0         28.4          2.5         42.9           74

  2852.1           V           -97.4         NF            9.6         31.1          3.1         43.9           74
  2852.1           H           -95.9         NF           11.1         31.1          3.1         45.4           74

  3802.8           V           -96.8         NF           10.2         33.0          3.8         47.0           74
  3802.8           H           -96.8         NF           10.2         33.0          3.8         47.0           74

  4753.5           V           -98.3         NF           8.7          34.9          4.5         48.1           74
  4753.5           H           -98.1         NF           8.9          34.9          4.5         48.3           74




Notes:        [1] QP = Quasi-peak, P = Peak, NF = Noise Floor of the Spectrum Analyzer
              [2] The Spectrum Analyzer settings are as follows:
                  Fundamental - Resolution Bandwidth = 120 kHz; Video Bandwidth = 300 kHz; Span = 10 MHZ.
                  Harmonics - Resolution Bandwidth = 1 MHz; Video Bandwidth = 3 MHz; Span = 50 MHZ.
              [3] "Final Level" numbers in bold are RF signal levels.
                  "Final Level" numbers in italics are noise floor and as such indicate that there is no RF signal at that level.
                  The "Antenna Correction Factor" and the "Cable Loss" have been factored in with the noise floor levels in
                  order to demonstrate what the "Final Level" of an RF signal at the noise floor level would have been equal to.
                  Refer to Attachment F
                  The "Final Limit", in the case of the harmonics, represents 20 dB above the average limit in FCC Part 15.109.
                  Refer to Attachment B (Part 15.35 (b)).
                  PDSA ( Pulse Desensitization of the Spectrum Analyzer ) was not factored in when the level measured
                  represented either the noise floor or a harmonic. PDSA of the harmonics at a Resolution Bandwidth of 1MHz
                  is equal to 6.9 dB. - See Attachment D.




Report # W980831                                                                                                     Page 12 of 17


                                                                                                                         FCC ID: EO940GN-1



                                                ATTACHMENT A cont.

EUT:                          Encoder/Receiver/Transmitter                       FCC Part 15.109
Model :                       40GN-1                                             Radiated Emissions-Receiver
Serial No.:                   GN980831                                           Test Dates:                 August 26, 27, 28 & 31, 1998
                                                                                 Engineer:                   Robert A. Sleen
                                                                                                                   [3]
                                                                                      Ant.         Cable         Final
     Freq.         Ant.             Level                             Level          Factor         Loss         Level            Limit
     MHz           Pos.             dBm               [1]             dBuV             dB            dB         dBuV/m           dBuV/m

    1901.4           V             -109.5             NF               -2.5            28.4              2.5             28.4             54
    1901.4           H             -109.5             NF               -2.5            28.4              2.5             28.4             54

    2852.1           V             -109.3             NF               -2.3            31.1              3.1             31.9             54
    2852.1           H             -109.3             NF               -2.3            31.1              3.1             32.0             54

    3802.8           V             -110.9             NF               -3.9            33.0              3.8             32.9             54
    3802.8           H             -110.9             NF               -3.9            33.0              3.8             32.9             54

    4753.5           V             -112.2             NF               -5.2            34.9              4.5             34.2             54
    4753.5           H             -112.2             NF               -5.2            34.9              4.5             34.2             54




NOTES:        [1] QP = Quasi-peak, P = Peak, NF = Noise Floor of the Spectrum Analyzer
              [2] The Spectrum Analyzer settings are as follows:
                  Resolution Bandwidth = 1 MHz; Video Bandwidth = 10 Hz; Span = 0 HZ.
              [3] "Final Level" numbers in bold are RF signal levels.
                  "Final Level" numbers in italics are noise floor and as such indicate that there is no RF signal at that level.
                  The "Antenna Correction Factor" and the "Cable Loss" have been factored in with the noise floor levels in
                  order to demonstrate what the "Final Level" of an RF signal at the noise floor level would have been equal to.




Report # W980831                                                                                                                    Page 13 of 17


                                                                                      FCC ID: EO940GN-1



                                         ATTACHMENT B
                      Conversion from Instantaneous Peak Power to Average Power
                                             40GN ERT®

The ERT Unit Transmits a sequence of eight Manchester Encoded Messages in a ten second Period. Each of the
messages are 5.86 msec long. Each message is broadcast on a different frequency within the Transmit Band.

   8 Messages                      8 Messages
 ³³³³³³³³                   ³³³³³³³³
| | 114 msec
 | 11 Seconds |

Zooming in on a message length;
      12 - 8 bit bytes                                 12 - 8 bit bytes
   ÝÝÝÛ Û ÝÝ ÝÛ ÝÝÝ ÝÛ                                     ÝÝÝÛ Û ÝÝ ÝÛ ÝÝÝ ÝÛ
|    5.86 msec           |
  | 114 msec                  |

                                            Where bit rate is: 16.384 Kbits/Second.

During the transmission of eight messages, the Transmit Duty Cycle can be computed.

              % Duty Cycle Transmit = (96 bits) (1/16.384 Kbits/Sec) (.5) (100%) / (100 msec)

              % Duty Cycle Transmit = 2.93 %
       Note: The .5 factor is a result of Manchester Encoded Data.

       Expressing the correction factor for Duty Cycle in dB:

              dB Duty Cycle Transmit = 20 Log (Duty Cycle)
              dB Duty Cycle Transmit = 20 Log (0.0293)
              dB Duty Cycle Transmit = -30.7 dB


During the receive mode, the Receiver Duty Cycle can be computed.

              % Duty Cycle Receive = (0.3 µsec.) (512 Hz ) (100 %)
              % Duty Cycle Receive = .01536 %

       Expressing the correction factor for Duty Cycle in dB:

              dB Duty Cycle Receive = 20 Log ( 1.536 ∗ 10 -4 )
              dB Duty Cycle Receive = - 76.3



Report # W980831                                                                            Page 14 of 17


                                                                                 FCC ID: EO940GN-1



                                     ATTACHMENT C
                                          Part 15.31(m)

        Measurement of Relative Field Intensity at the High and Low Frequencies of the EUT.




Report # W980831                                                                      Page 15 of 17


                                                                                           FCC ID: EO940GN-1




                                          ATTACHMENT D
                               Pulse Desensitization of the Spectrum Analyzer



Pulse Desensitization of the Spectrum Analyzer is the rise time delay inherently imposed by the resolution
bandwidth setting of the spectrum analyzer. The resulting attenuation of narrow pulse signals necessitates that a
compensating factor be applied to the levels on the spectrum analyzer when peak levels are being measured.

This does not apply to Quasi-peak measurements.

Reference: Application Note 150-2 "Spectrum Analysis of Pulsed RF", Hewlett Packard, November 1971



Example:

PDSA = 20 log ( Pulse width x 1.5 x Spectrum Analyzer Resolution Bandwidth )
PDSA = 20 log ( .15 x 10 -6 x 1.5 x 1 x 10 6 )
PDSA = -12.96 dB

                      Pulse Desensitization of the Spectrum Analyzer

                                        Spectrum Analyzer Resolution Bandwidth
                               RF Pulse 100 kHz 300 kHz 1 MHz          3 MHz
                                Width               Desensitization
                                (nsec.)  ( dB )   ( dB )      ( dB )    ( dB )
                                  500    -22.5     -13.0       -2.5
                                  450    -23.4     -13.9       -3.4
                                  400    -24.4     -14.9       -4.4
                                  350    -25.6     -16.1       -5.6
                                  300    -26.9     -17.4       -6.9
                                  250    -28.5     -19.0       -8.5
                                  225    -29.4     -19.9       -9.4
                                  200    -30.5     -20.9      -10.5      -0.9
                                  175    -31.6     -22.1      -11.6      -2.1
                                  150    -33.0     -23.4      -13.0      -3.4
                                  125    -34.5     -25.0      -14.5      -5.0
                                  100    -36.5     -26.9      -16.5      -6.9
                                   75    -39.0     -29.4      -19.0      -9.4
                                   50    -42.5     -33.0      -22.5     -13.0



Report # W980831                                                                                 Page 16 of 17





Document Created: 2001-07-13 15:58:40
Document Modified: 2001-07-13 15:58:40

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC