LLB7330Transmitter for Meter Reading

January 16, 2003 Federal Communications Commission Office of Engineering and Technology Equipment Approval Services RE : Request for Confidentiality Attached Form 731 – Application for Class II Permissive Change FCC ID: LLB7330 Dear Sir or Madam: Hexagram Inc. does not wish to publicly disclose certain technical information which is enclosed with this application. This material contains critical trade secrets and we request that the Commission withhold this information from public inspection pursuant to the provisions of Section 0.457(d) and 0.459 of the Commissions Rules, and Section 552(b)(4) of the Freedom of Information Act. This letter summarizes previously sent to request for confidentiality. MATERIAL TO BE HELD CONFIDENTIAL: File Name Description Pages LLB7330-Int photos.pdf Internal Circuit Board Photos Two pages LLB7330-Schematic.pdf Circuit Schematics Three Pages LLB7330-Operation Desc.pdf Description of Operation Two Pages LLB7330-Installation.pdf Installation manual Thirty seven pages LLB7330 Block Diagram.pdf Block Diagram of the device One page LLB7330 Bill of Materials.pdf BOM Four pages LLB7330 Tune Up.pdf Field Calibration and Tune Up Procedure One page The LLB7330 electronic assembly is permanently sealed inside of a sealed electrical meter which cannot be opened without destruction of the packaging and/or the seal of the meter. The above listed material is confidential and is not available to the public or end user. Sincerely, Lawrence M. Sears Director of Technology

External Photo 11.14.02 p. 1 of 2 LLB7330 External Photo 11.14.02 p. 2 of 2 LLB7330

External Photo 11.14.02 p. 1 of 2 LLB7330 External Photo 11.14.02 p. 2 of 2 LLB7330

Hexagram Transmitter FCC ID LLB7330 FREQUENCY STABILITY vs. AMBIENT TEMPERATURE VARIATION With the transmitter installed on a typical electric meter assembly, the temperature stability of the frequency generating components was observed. The meter assembly was placed in a temperature chamber. The power supply powering the transmitter was outside the chamber along with the computer which signaled the transmitter to transmit. A small loop receiving antenna was also inside the chamber with its output going to the frequency measuring spectrum analyzer. With the transmitter programmed to transmit at 460.00000 MHz, the chamber temperature was set to 20° C. After reaching the set temperature, the transmitter was allowed to stabilize for about 10 minutes or more. The transmitter was instructed to transmit, the signal was captured by the spectrum analyzer and the frequency was determined and compared to the expected 460.00000. The temperature in the chamber was then increased in 10° C increments. At each new temperature, time was allowed for stabilization of the transmitter, a transmission was made and the frequency determined. The temperature was increased at the 10° C increments to 70° C, and then reduced back to 20° C where another reading was taken. The temperature was then reduced in 10° C increments, checking the frequency at each point, until a temperature of -30° C was reached. The frequency at each temperature was recorded and is found in Table 1. It can be seen from the table that all readings are with the 2.5 ppm allowed. Expected Frequency 460.000 MHz Temperature ° C Measured Frequency MHz Dev. ppm 70 459.99966 -0.739 60 459.99971 -0.630 50 459.99978 -0.478 40 459.99976 -0.522 30 459.99988 -0.261 20 459.99972 -0.609 10 459.99961 -0.848 0 459.99971 -0.630 -10 459.99981 -0.413 -20 459.99977 -0.500 -30 459.99984 -0.348 Imbedded microcontroller disables MTU operation outside of this temperature range. Measured and Recorded on December 19, 2002 SUMMARY The Hexagram LLB 7330Transmitting Unit (Electrical meter) has been shown to be capable of complying with those requirements of the Federal Communications Commission for a Part 90 transmitter that are covered by this report. EQUIPMENT UNDER TEST “Electric MTU” Transmitter, Model 7330 MANUFACTURER Hexagram, Inc. 23905 Mercantile Cleveland, OH 44122 TEST DATE December 19, 2002 MEASUREMENT EQUIPMENT Hewlett-Packard Spectrum Analyzer Type 8560A with 8560A RF Section 85650A Quasi-Peak Adapter ANTENNAS ½ WL Dipole Antenna MISCELLANEOUS 7.5 m RG-213/U coaxial cable Environmental Chamber, Model VersaTenn II Temp Range: -73C to +200C Radio Shack 63-1011 Digital Thermometer Lazar Feldman David Allen

SMITH ELECTRONICS, INC. ELECTROMAGNETIC COMPATIBILITY LABORATORIES RADIO-FREQUENCY STABILITY vs. AC-LINE VOLTAGE VARIATION TEST REPORT FOR HEXAGRAM, INC. ELECTRIC METER TRANSMITTING UNIT (MTU) Model 7330 FCC ID: LLB7330 November 22, 2002 Prepared by: Prepared for:Hexagram, Inc. 23905 Mercantile Road Cleveland, OH 44122 Smith Electronics, Inc. 8200 Snowville Road Brecksville, OH 44141 Phone: (440) 526-4386 Fax: (440) 526-9205 James R. Pollock FREQUENCY STABILITY vs. AC-LINE VOLTAGE (Supplied Voltage) The frequency stability was determined as a function of the power line input voltage. A variable transformer was used to set the voltage between about 85% and 115% of the nominal 220 VAC input. To cover the voltage range of 187 V to 253 V, measurements were made every 10 V between 180 V and 260 V. When the voltage was set to a measurement point, the transmitter was instructed to transmit and the signal captured by the spectrum analyzer and the frequency value determined. The data for these measurements are found in Table 1. It can be seen that all values obtained are within the 2.5 ppm allowed. TABLE 1 FREQUENCY STABILITY vs. SUPPLY VOLTAGE INPUT AC Volts Measured Frequency MHz Dev. Hz Dev. ppm Expected = 460.00000 260459.99905-950-2.07 250459.99925-750-1.63 240459.99955-450-0.98 230459.99935-650-1.41 220459.99950-500-1.09 210459.99965-350-0.76 200459.99895-1050-2.28 190459.99895-1050-2.28 180459.99975-250-0.54 TEST INFORMATION SUMMARY The Hexagram Electric Meter Transmitting Unit transmitter, has been shown to be capable of complying with those requirements of the Federal Communications Commission for a Part 90 transmitter that are covered by this report. EQUIPMENT UNDER TEST “Electric MTU” Transmitter, Model 7330 MANUFACTURER Hexagram, Inc. 23905 Mercantile Cleveland, OH 44122 TEST DATE October16, 2002 TEST LABORATORY Smith Electronics, Inc. 8200 Snowville Road Cleveland, OH 44141 (440)526-4386 MEASUREMENT EQUIPMENT Hewlett-Packard Spectrum Analyzer Type 8568B with 8560A RF Section S/N 2216A02120 85662A Display Section S/N 2152A03686 85650A Quasi-Peak Adapter S/N 2043A00350 Calibrated 6/02 Fluke digital voltmeter Model 23 ANTENNAS EMCO Model 3146 Log-Periodic antenna, Frequency range of 200 MHz - 1000 MHz MISCELLANEOUS 12.2 m RG-214/U coaxial cable Variable voltage source was a Superior Electric Co. Type 1226 Powerstat.

SMITH ELECTRONICS, INC. ELECTROMAGNETIC COMPATIBILITY LABORATORIES RADIO-FREQUENCY CONDUCTED & RADIATED EMISSIONS TEST REPORT FOR HEXAGRAM, INC. ELECTRIC METER TRANSMITTING UNIT (MTU) (DIGITAL DEVICE) Model 7330 FCC ID: LLB7330 November 25, 2002 Prepared by: Prepared for:Hexagram, Inc. 23905 Mercantile Road Cleveland, OH 44122 Smith Electronics, Inc. 8200 Snowville Road Brecksville, OH 44141 Phone: (440) 526-4386 Fax: (440) 526-9205 James R. Pollock TEST REPORT INTRODUCTION The Hexagram Electric MTU transmitter is a line-powered transmitter designed to be installed in a typical electric meter. The transmitter will be mounted inside the glass cover of the meter and provide a very short, intermittent radio frequency transmission to provide a remote reading of the meter. A microprocessor provides timing, control and data processing functions. The built in antenna is inaccessible to the user and no provision is made for an external antenna. This report describes the tests performed on the digital device as support for verification of compliance to the FCC Rules. MEASUREMENTS PERFORMED The transmitter under test was examined for emissions from the microprocessor portion of the system with the transmitter portion inactive. Both conducted and radiated emissions were checked. Measurements were performed under the basic procedures of (ANSI) C63.4-1992. CONDUCTED EMISSIONS As the system is AC line-powered the conducted emissions on the AC line were measured. The electric meter housing the transmitter assembly was placed on a non-conducting table and positioned 40 cm from the shielded room wall with all other conducting surface at least 80 cm away. The AC power was provided through an LISN, which provides the standardized impedance required. This test was performed at 115 VAC although other voltages may be used to power the system. The frequency range of 450 kHz – 30 MHz was covered in two sweeps of the spectrum analyzer. The first was 0 – 3 MHz, while the second was 0 – 30 MHz. The results of the sweeps are shown in Fig. 1. Both sides of the AC line were examined and are shown on each sweep along with the limits for Class B digital devices. As can be seen in the figure, no emissions are observed above the noise floor of the test system that is at least 20 dB below the limit of 48 dBuV for consumer digital devices. RADIATED EMISSIONS The meter and transmitter were set up on a non-conducting table in the shielded room. With the system powered but not transmitting, scans were made of the radiated emissions between 30 and 1000 MHz. Using broadband antennas at a 1 m test distance, the required spectrum was scanned using two spans. The first, 0 – 200 MHz was for the 30 – 200 MHz range while the second, 0 – 1000 MHz was for the 200 – 1000 MHz range. Although the test sample was not rotated, the higher sensitivity capability of the test setup permits observation of any significant signals. The results of the frequency scans are seen in Fig. 2. Each plot shows the results of both horizontal and vertical polarized antennas as well as the limit for Class B digital devices as modified for gains and losses of the system. As can be seen in the plots, no emissions are observed above the noise floor and ambients of the system. Because no emissions were observed at this close range, no attempt was made to measure the emissions on the 3 m open field test site. It is obvious that the digital portion of the Electric MTU produces no emissions greater than, or even close to, the appropriate limit. CONCLUSION Based on the emissions measured and described in this report, the digital portion of the Electric MTU, Model 7330, are well within the emissions limits of the FCC as found in sections 15.107 and 15.109 of the Rules and Regulations. Fig. 1 CONDUCTED EMISSIONS HEXAGRAM ELECTRIC MTU 450 kHz – 30 MHz Red = Neutral Line Black = Hot Line FCC Class B Limit FCC Class B Limit Fig. 2 RADIATED EMISSIONS HEXAGRAM ELECTRIC MTU 30 MHz – 1000 MHz Red = Vertical Black = Horizontal FCC Class B Limit FM Signals FCC Class B Limit TEST INFORMATION SUMMARY The Hexagram Electric Meter Transmitting Unit transmitter, has been shown to be capable of complying with those requirements of the Federal Communications Commission for a Class B digital device under Parts 15.107 and 15.109. EQUIPMENT UNDER TEST “Electric MTU” Transmitter, Model 7330 MANUFACTURER Hexagram, Inc. 23905 Mercantile Cleveland, OH 44122 TEST DATE October 14-16, 2002 TEST LABORATORY Smith Electronics, Inc. 8200 Snowville Road Cleveland, OH 44141 (440)526-4386 MEASUREMENT EQUIPMENT Hewlett-Packard Spectrum Analyzer Type 8568B with 8560A RF Section S/N 2216A02120 85662A Display Section S/N 2152A03686 85650A Quasi-Peak Adapter S/N 2043A00350 Calibrated 6/02 ANTENNAS EMCO Model 3104 Bi-Conical Frequency Range 30 – 200 MHz EMCO Model 3146 Log-Periodic Frequency Range 200 – 1000 MHz MISCELLANEOUS 12.2 m RG-214/U coaxial cable 1.8 m RG-214/U coaxial cable LISN’s

SMITH ELECTRONICS, INC. ELECTROMAGNETIC COMPATIBILITY LABORATORIES RADIO-FREQUENCY EMISSIONS TEST REPORT FOR HEXAGRAM, INC. ELECTRIC METER TRANSMITTING UNIT (MTU) Model 7330 FCC ID: LLB7330 January 10, 2003 Prepared by: Prepared for: Hexagram, Inc. 23905 Mercantile Road Cleveland, OH 44122 Smith Electronics, Inc. 8200 Snowville Road Brecksville, OH 44141 Phone: (440) 526-4386 Fax: (440) 526-9205 James R. Pollock TEST REPORT INTRODUCTION The Hexagram Electric MTU transmitter is a line-powered transmitter designed to be installed in a typical electric meter. The transmitter will be mounted inside the glass cover of the meter and provide a very short, intermittent radio frequency transmission to provide a remote reading of the meter. A microprocessor provides timing, control and data processing functions. The built in antenna is inaccessible to the user and no provision is made for an external antenna. This report describes the tests performed on the transmitter for output power and spurious emissions. MEASUREMENTS PERFORMED Measurements were made to determine the equivalent output power and the level of harmonic emissions in relation to the fundamental frequency using the substitution test method of TIA-603. POWER OUTPUT AND SPURIOUS EMISSIONS A series of measurements of the operating frequency and any harmonic emissions was made on the Smith Electronics, open field test site located at 8200 Snowville Road, Brecksville, OH. Data pertinent to this site is on file with the FCC. A scan of the transmitter emissions made in the shielded room showed no significant emissions other than the fundamental and its harmonics. Measurements below 1000 MHz were made at a three-meter test distance with frequencies above 1000 MHz being measured at one meter. A receiver and a tuned dipole were used for receiving below 1000 MHz and a spectrum analyzer and a wave guide antenna were used above 1000 MHz. The transmitter, installed in a typical meter, was placed on a remotely rotatable, non- conducting test stand. This general set up is shown in Pictorial 1. Because of the intermittent nature of the normally operating transmitter and its mode of operation while AC powered, an external battery pack was connected directly to the transmitter and the transmitter was forced to continually transmit for the measurements. With the test receiver tuned to the unmodulated signal, the transmitter under test was rotated to the position of maximum signal. The receiving antenna was then varied between 1 and 4 meters in height to again maximize the signal. Measurements were made with the antennas positioned both vertically and horizontally and the maximum signal recorded. No differences were observed with different signal detectors, so a quasi-peak detector was used for the signals below 1000 MHz and average detection above 1000 MHz. After the maximum received meter readings were obtained for each frequency and polarity, the meter under test was removed from the area and replaced by a signal generator and transmitting antenna. With the transmit antenna placed as close as possible to the position of the test unit, the signal generator was activated at a test frequency. With the signal detected, the transmit antenna was rotated slightly to maximize the reading. The receive antenna was also positioned for maximum reception. The signal generator output was then adjusted until the received signal was equal to the received signal from the unit under test. These measurements were repeated for each frequency and antenna orientation and the maximum values obtained are noted in Table 1. Antenna gain and coax loss figures are also included in Table 1 In order to convert the signal generator output value to equivalent radiated power from a dipole, the following equation is used: P d = P g – cable loss(dB) + antenna gain(dB d ) where: P d is the dipole equivalent power, P g is the generator output into the substitution antenna and “antenna gain” is the gain of the substitution antenna with respect to a dipole. According to 90.210(d)(3) all emissions greater than 12.5 kHz from the center of the authorized band shall be attenuated below the unmodulated carrier by 50 + 10log(P). Using P = 0.0126 W, the required attenuation is 31.0 dB. An examination of Table 1 shows that all emissions are 35.3 dB or more below the carrier power level. TABLE 1 HEXAGRAM EMU TRANSMITTER SUBSTITUTION METHOD per TIA-603 3 meter measurement using LPA antenna Frequency (MHz) Gen. Output (dB) Coax Loss (dB) Ant. Gain (dBd) Dipole Eq. Power (dBm) Difference (dB) 460 +8.5 0.3 2.8 11.0 -- 920 -33.5 0.5 3.8 -30.2 -41.2 1 meter measurement using horn antenna Frequency (MHz) Gen. Output (dBm) Coax Loss (dB) Ant. Gain (dBd) Dipole Eq. Power (dBm) Difference (dB) 1380 -36.0 0.7 3.1 -33.6 -44.6 1840 -42.3 0.8 4.9 -38.2 -49.2 2300 -40.7 0.9 5.6 -36.0 -47.0 2760 -29.4 1.1 6.2 -24.3 -35.3 3220 -33.8 1.2 6.7 -28.3 -39.3 3680 -40.1 1.3 6.6 -34.8 -45.8 4140 -39.3 1.4 6.5 -34.2 -45.2 4600 -42.3 1.5 7.2 -36.6 -47.6 11 dBm = 12.6 mW or 0.0126 W Required attenuation for harmonics is 50 + log (.0126) = 31.0 dB PICTORIAL 1 HEXAGRAM ELECTRIC METER UNIT TEST SET UP PICTORIAL 2 HEXAGRAM SUBSTITUTION METHOD TEST SET UP Above 1000 MHz Below 1000 MHz TEST INFORMATION SUMMARY The Hexagram Electric Meter Transmitting Unit transmitter, has been shown to be capable of complying with those requirements of the Federal Communications Commission for a Part 90 transmitter regarding output power and spurious emissions. EQUIPMENT UNDER TEST “Electric MTU” Transmitter, Model 7330 MANUFACTURER Hexagram, Inc. 23905 Mercantile Cleveland, OH 44122 TEST DATE October 14 - 16, 2002 & January 8, 2003 TEST LABORATORY Smith Electronics, Inc. 8200 Snowville Road Cleveland, OH 44141 (440)526-4386 TEST EQUIPMENT USED RECEIVERS Singer-Stoddart EMI Field Intensity Meter Model NM 37/57 S/N 0366-06168 Calibrated 6/02 Hewlett-Packard Spectrum Analyzer Model 8593EM S/N 3536A00147 Calibrated 6/00 SIGNAL GENERATORS Marconi Mode…

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Transient Frequency Behavior LLB7330 June 14/02Page 1 of 10 November 11, 2002 FCC ID: LLB7330 TRANSIENT FREQUENCY BEHAVIOR Test Setup The LLB7330 transmitter was tested for transient frequency behavior using the test method TIA/EIA-603. The test setup is shown in Fig. 1. The 5373-LZ test receiver with audio bandwidth set to16kHz (low pass) was used. The receiver is furnished with 14.4 MHz high-stability reference generator. The storage oscilloscope was triggered in a presence of an RF radiation from the transmitter which was delayed using a variable digital delay build into the oscilloscope. The 1 kHz test signal was provided by the Marconi Signal Generator. The 1 kHz signal was attenuated by a build into Marconi attenuator to insure 50 dB down from the received signal of LLB7330. Figure 1 Test Setup Transient Frequency Behavior LLB7330 June 14/02Page 2 of 10 Test Requirements The test requirements per 90.214 are: 1. Frequency deviation during t 1 (10ms duration after t on ) may be greater than +/-12.5 kHz because output power is less than 6 watts. 2. Frequency deviation during t 2 (25 ms duration after t 1 ) must be less than +/-6.25 kHz. 3. Frequency deviation after t 2 must be less than +/-2.5ppm x 460MHz = +/-1.15 kHz. 4. Frequency deviation during t 3 (10ms duration after transmitter is turned off) may exceed +/-12.5 kHz because output power is less than 6watts. Test Data Figures 2 through 8 show the measured LLB6717 Transient Frequency characteristics. The limit masks are shown overlaid on figures 3 through 6. Time scale used on Fig.2 is 1 ms, Figures 4, 5, and Fig.8 is 5ms per division, Fig.6 is 10 ms per division, Fig.3 and 7 is 2.5 ms/div. Deviation scales of 4 kHz per division and 0.8 kHz per division were used in order to better resolve details of the waveforms. Measured waveforms include the following. Figure 2: 1kHz Test Signal +/-12.5kHz Deviation – 4kHz per Division Figure 3: LLB7330 Turn On – Test Signal Modulated – 4kHz per Division Figure 4: LLB7330 Turn On – Test Signal Unmodulated – 0.8kHz per Division Figure 5: LLB7330 Turn On – Test Signal Modulated – 0.8kHz per division Figure 6: LLB7330 Turn On – Test Signal Unmodulated – 0.8kHz per Division Figure 7: LLB7330 Turn Off – Test Signal Modulated – 4kHz per division Figure 8: LLB7330 Turn Off – Test Signal Modulated – 0.8kHz per division Transient Frequency Behavior LLB7330 June 14/02Page 3 of 10 Test Results Transient Frequency Behavior LLB7330 June 14/02Page 4 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 5 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 6 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 7 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 8 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 9 of 10 Transient Frequency Behavior LLB7330 June 14/02Page 10 of 10 Figure 2 shows the receiver response to the 1kHz test signal. Figure 4 shows the turn on response with the test signal unmodulated in order to identify the T on point. Figure 3 shows the LLB7330 turn on response is well within the required +/-6.25kHz during interval T 2 . Interval T 2 starts 10ms after T on and continues for duration of 25ms. There is no transient frequency limit specified during interval t1 since the output power does not exceed 6watt. Figure 6 show that the LLB7330 frequency accuracy is well within the requirement of +/- 1.15 kHz from the end of T 2. Figure 7 and 8 show the LLB7330 turn off response. There is no transient frequency limit during interval T3 since the output power does not exceed 6watt. Conclusion The Hexagram LLB7330 transmitter has been shown to be capable of complying with the requirements of the FCC Part 90 transmitter that is covered by this report. Measurements made and recorded on November 11, 2002 by: Lazar Feldman David Allen, Measurement Equipment Hewlett Packard Spectrum Analyzer model 8560A Option 003 high stability reference Marconi Instruments Radio Communications Test Set model 2955A Tektronix Digital Storage Oscilloscope model TDS350 Hexagram Test receiver 5373-LZ with high stability reference oscillator.