NLHWCS20Digital Scale Transmitter

1 Marianne Bosley To: [email protected] Subject: Metrak #12889 Crystal Field Ltd. FCC ID: NLHWCS20 Hi Alice, Below are some admin issues I need to clear up before forwarding to technical review: 1. Confidentiality Request - I need a revised letter (see example that I have attached). I know that your customers very seldom request this, so you may not remember the few important things that need to happen with them. a. Reference 0.459 Rule section (this is from FCC Rules ). It must be referenced in the letter. b. FCC Identifier - You must indicate what the FCC ID is in the subject line of the letter. c. Exhibits to be witheld - you must be specific as to which you are requesting to be held confidential. The ones that the FCC usually allow without a problem are schematics and block diagrams. Anything else gets a bit tricky; for instance, if you were to state internal photos, you must state exactly what you have done to prevent the public from accessing the inside of the device and obtaining their own internal photos. Also, you must not list on the letter anything that we would not be sending to the FCC anyway (for Part 15 devices parts lists, PCB layouts, etc. are not required). The usual ones that are submitted for Part 15 are test report, photos (all), block diagrams, schematics, description, label and lcoation, and manual. You must also include in this letter why you are requesting it (for example, proprietary information that will never be in the hands of the public, etc. ) 2. Description - there wasn't one. 3. Test report - It looks like you have the wrong cover page (finderzkeeperz). Please submit correct report. Please respond and if you have any questions, let me know. Have a good day. Regards, Marianne Marianne T. Bosley EMC Administrator 410-354-3300 X 412 [email protected]

PHOTOGRAPH OF THE PRODUCT FRONT VIEW OF THE PRODUCT REAR VIEW OF THE PRODUCT

PHOTOGRAPH OF THE PRODUCT INNER CIRCUIT TOP VIEW INNER CIRCUIT BOTTOM VIEW INNER CIRCUIT TOP VIEW INNER CIRCUIT BOTTOM VIEW INNER CIRCUIT TOP VIEW INNER CIRCUIT BOTTOM VIEW INNER CIRCUIT TOP VIEW INNER CIRCUIT BOTTOM VIEW

FCC ID: NLHWCS20 Circuit Description The 914.7(304.9x3)MHz crystal oscillator drives the base of Q4 the final/buffer amplifier. The modulation provided by U1. The output of Q4 has the matching network consisting of C1 and L1 that limit the harmonic content and effect the proper coupling of the antenna to the output stage. Antenna, Ground and Power Source There is no external antenna. There is no external ground connection. The ground is only that of the printed circuit board. Electric current is supplied by a 9 Volt (“6F22” size battery x 1) primary battery

Date: 2002-08-29 TEST REPORT Page 1 of 16 No.: HM107949 FCC PART 15 SUBPART C CERTIFICATION REPORT FOR LOW POWER TRANSMITTER TEST REPORT No.:HM107949 Equipment Under Test [EUT]:Digital Scale Model Number:WCS20 Applicant:Crystal Field Ltd. FCC ID :NLHWCS20 Date: 2002-08-29 TEST REPORT Page 2 of 16 No.: HM107949 CONTENT: Cover Page 1 of 16 Content Page 2-3 of 16 Conclusion Page 4 of 16 1.0General Details 1.1Test Laboratory Page 5 of 16 1.2Applicant Details Page 5 of 16 Applicant HKSTC Code Number for Applicant Manufacturer 1.3Equipment Under Test [EUT] Page 6 of 16 Description of EUT operation 1.4Date of Order Page 6 of 16 1.5Submitted Sample Page 6 of 16 1.6Test Duration Page 6 of 16 1.7Country of Origin Page 6 of 16 1.8 Additional Information of EUT Page 7 of 16 2.0Technical Details 2.1Investigations Requested Page 8 of 16 2.2Test Standards and Results Summary Page 8 of 16 3.0Test Results 3.1Emission Page 9-13 of 16 Date: 2002-08-29 TEST REPORT Page 3 of 16 No.: HM107949 Appendix A List of Measurement Equipment Page 14 of 16 Appendix B Photographs Page 15-16 of 16 Date: 2002-08-29 TEST REPORT Page 4 of 16 No.: HM107949 CONCLUSION The submitted product was deemed to have COMPLIED after modification by customer with the requirements of Federal Communications Commission [FCC] Rules and Regulations Part 15. The tests were performed in accordance with the standards described above and on Section 2.2 in this Test Report. Verify byPatrick Wong for Chief Executive Date: 2002-08-29 TEST REPORT Page 5 of 16 No.: HM107949 1.0General Details 1.1Test Laboratory The Hong Kong Standards and Testing Centre Ltd. EMC Laboratory 10 Dai Wang Street, Taipo Industrial Estate New Territories, Hong Kong Telephone:852 2666 1888 Fax:852 2664 4353 1.2Applicant Details Applicant CRYSTAL FIELD LTD. Unit 23, 16/F., Goldfield Ind. Ctr., 1 Sui Wo Road, Fotan, Shatin, N.T., Hong Kong. Telephone:852 2601 9282 Fax:852 2692 3197 HKSTC Code Number for ApplicantCRF001 Manufacturer CRYSTAL FIELD LTD. Unit 23, 16/F., Goldfield Ind. Ctr., 1 Sui Wo Road, Fotan, Shatin, N.T., Hong Kong. Telephone:852 2601 9282 Fax:852 2692 3197 Date: 2002-08-29 TEST REPORT Page 6 of 16 No.: HM107949 1.3Equipment Under Test [EUT] Description of Sample Product:Digital Scale Manufacturer:Crystal Field Ltd. Brand Name:CONTEK Model Number:WCS-20 Input Voltage:9Vd.c (“6F22” size battery x 1) 1.3.1Description of EUT Operation The Equipment Under Test (EUT) is a Crystal Field Ltd., Digital Scale. The EUT is to transmit RF signal while each button is being, Modulation by Data Code tape is pulses modulation. 1.4Date of Order 2002-05-31 1.5Submitted Sample(s): 2 Samples per model 1.6Test Duration 2002-08-29 1.7Country of Origin China Date: 2002-08-29 TEST REPORT Page 7 of 16 No.: HM107949 1.8Additional Information of EUT SubmittedNot Available User Manual Part List Circuit Diagram Printed Circuit Board [PCB] Layout Block diagram FCC ID Label Date: 2002-08-29 TEST REPORT Page 8 of 16 No.: HM107949 2.0Technical Details 2.1Investigations Requested Perform ElectroMagnetic Interference measurement in accordance with FCC 47CFR [Codes of Federal Regulations] Part 15 and ANSI C63.4:2000 for FCC Certification. 2.2Test Standards and Results Summary Tables EMISSION Results Summary Test ConditionTest RequirementTest MethodClass /Test Result SeverityPassFailedN/A Field Strength of Fundamental Emissions & Spurious Emissions FCC 47CFR 15.249ANSI C63.4:2000N/A Radiated Emissions, 30MHz to 1GHz FCC 47CFR 15.209ANSI C63.4:2000Class B Conducted Emissions on AC, 0.15MHz to 30MHz FCC 47CFR 15.207ANSI C63.4:2000Class B Note: N/A - Not Applicable Date: 2002-08-29 TEST REPORT Page 9 of 16 No.: HM107949 3.0Test Results 3.1Emission 3.1.1Radiated Emissions Test Requirement:FCC 47CFR 15.249 Test Method:ANSI C63.4:2000 Test Date:2002-08-29 Mode of Operation:On mode Test Method: The sample was placed 0.8m above the ground plane on the OATS *. Measurements in both horizontal and vertical polarities were performed. During the test, each emission was maximized by: having the EUT continuously working, investigate all operating modes, rotated about all 3 axis (X, Y & Z) to obtain worst position, manipulating interconnecting cables, rotating turntable, varying antenna height from 1m to 4m in both horizontal and vertical polarization. The emissions worst-case are shown in Test Results of the following pages. *:OATS [Open Area Test Site] located at HKSTC with a metal ground plane on filed with the FCC pursuant to section 2.948 of the FCC rules, with Registration Number: 90657. Test Setup: EUT distance = 3m Pre -Amplifier Receiver Turn Table Computer Ground plane Date: 2002-08-29 TEST REPORT Page 10 of 16 No.: HM107949 Limits for Field Strength of Fundamental Emissions [FCC 47CFR 15.249]: Frequency Range of Fundamental Field Strength of Fundamental Emission Field Strength of Harmonics Emission [MHz][millivolts/meter][microvolts/meter] 902-92850500 2400-2483.550500 5725-587550500 24000-225002502500 ** Linear interpolations Results: CorrectionLimit **Antenna Factor @3mPolarity dB μ V/m μ V/m 914.7032.729.962.61349.050,000.0Horizontal 1829.40<158.5<24.516.8500.0Horizontal 2744.10<157.5<23.615.1500.0Horizontal 3658.80<158.6<24.917.6500.0Horizontal 4573.50<159.7<25.619.1500.0Horizontal 5488.20<157.6<24.316.4500.0Horizontal 6402.90<158.3<25.118.0500.0Horizontal 7317.60<166.9<33.647.9500.0Horizontal 8232.30<167.9<34.150.7500.0Horizontal 9147.00<167.1<33.245.7500.0Horizontal MHzdB μ V/m Field Strength of Fundamental and 10th Harmonics Emissions Qusai-Peak Frequency Level @3m Field Strength Field Strength Measured dB μ V/m μ V/m Remarks: Correction Factor included Antenna Factor and Cable Attenuation. Calculated measurement uncertainty=30MHz to 300MHz±3.7dB 300MHz to 1GHz+3.0dB / -2.7dB Date: 2002-08-29 TEST REPORT Page 11 of 16 No.: HM107949 Limited for Radiated Emissions [FCC 47 CFR 15.209 Class B]: (30MHz to 1000MHz) Frequency RangeQuasi-Peak Limits [MHz][μV/m] 30-88100 88-216150 216-960200 Above96050…

Text truncated - open the document above for the full version.

1 Chris Harvey From: Chris Harvey Sent: Wednesday, October 23, 2002 9:31 AM To: 'Alice Wong'; [email protected] Cc: [email protected]; EED - Choy, Kitty; Greg Czumak Subject: METrak #12889 Crystal Field Review Alice, I have reviewed the application for Crystal Field FCC ID NLHWCS20 and found that the following items need to be cleared before issuance of the Grant: 1) Please submit a clear and legible copy of the schematic diagram (copy submitted is not legible). 2) Please submit another photograph of the PCBoard component and solder side with more of the PCBoard showing. The existing photographs are not clear and the PCBoard portion of the image is small and not good resolution. (I would suggest that you get closer to the PCBoard to take the photograph). 3) The Harmonics of the fundamental were apparently measured up to the 10th harmonics of 914.7MHz, but there is no indication of the frequency range of Spurious Emissions performed (the highest frequency listed is 205MHz). Please specify the frequency range of spurious measurements. These items must be cleared before the application can be completed. best regards, Chris Harvey MET Laboratories EMC [email protected] www.metlabs.com 800-638-6057 x-310 -----Original Message----- From:Alice Wong [SMTP:[email protected]] Sent:Wednesday, October 23, 2002 6:48 AM To:[email protected] Cc:[email protected]; EED - Choy, Kitty Subject:Check NLHWCS20 status Hi Marianne, Would you help me check the NLHWCS20 status, our client want to know the job status. Thanks. Best Regards Alice

1 Marianne Bosley From: Chris Harvey Sent: Friday, October 25, 2002 3:34 PM To: 'Alice Wong' Cc: [email protected]; EED - Choy, Kitty; [email protected] Subject: RE: METrak #12889 Crystal Field Review Alice, thank you for the reply. The 2 attachments are much clearer and satisfy the request. However, for the frequency of test I must not have been very clear so I will try to be more descriptive in the need for completion of this application. I see that on page 10 of the report there is an indication that measurements were performed up to 9147MHz for the Harmonics of the fundamental. Page 11 of the report shows the other spurious emissions from the transmitter that are required to be either 50dB down from the fundamental or to the 15.209 limit. On this page there is no indication of the frequency range of measurements, and the highest frequency listed is 205MHz. Please provide the start and stop frequency (frequency range) for the measurements of the spurious emissions. I hope this clarifies the request. Best regards, Chris Harvey Chris Harvey MET Laboratories EMC [email protected] www.metlabs.com 800-638-6057 x-310 -----Original Message----- From:Alice Wong [SMTP:[email protected]] Sent:Friday, October 25, 2002 7:23 AM To:[email protected] Cc:[email protected]; EED - Choy, Kitty Subject:METrak #12889 Crystal Field Review Dear Chris, Thank you for your reply, please see attached file for clearly circuit diagram and PCB layout photo. The fundamental and the spurious emission is recorded on test report page 10 and 11. Thanks. Best Regards Alice ----- Original Message ----- From: <[email protected]> To: <[email protected]>; <[email protected]> Cc: <[email protected]>; <[email protected]>; <[email protected]> Sent: Wednesday, October 23, 2002 9:31 PM Subject: METrak #12889 Crystal Field Review > Alice, I have reviewed the application for Crystal Field FCC ID NLHWCS20 and > found that the following items need to be cleared before issuance of the > Grant: 2 > > 1) Please submit a clear and legible copy of the schematic diagram (copy > submitted is not legible). > 2) Please submit another photograph of the PCBoard component and solder side > with more of the PCBoard showing. The existing photographs are not clear > and the PCBoard portion of the image is small and not good resolution. (I > would suggest that you get closer to the PCBoard to take the photograph). > 3) The Harmonics of the fundamental were apparently measured up to the 10th > harmonics of 914.7MHz, but there is no indication of the frequency range of > Spurious Emissions performed (the highest frequency listed is 205MHz). > Please specify the frequency range of spurious measurements. > > These items must be cleared before the application can be completed. > > best regards, > > Chris Harvey > Chris Harvey > MET Laboratories EMC > [email protected] > www.metlabs.com > 800-638-6057 x-310 > > > > -----Original Message----- > > From: Alice Wong [SMTP:[email protected]] > > Sent: Wednesday, October 23, 2002 6:48 AM > > To: [email protected] > > Cc: [email protected]; EED - Choy, Kitty > > Subject: Check NLHWCS20 status > > > > Hi Marianne, > > > > Would you help me check the NLHWCS20 status, our client want to know the > > job status. > > Thanks. > > > > Best Regards > > Alice << File: circuit.PDF >> << File: In-photo2.PDF >>

1 Marianne Bosley From: Marianne Bosley Sent: Tuesday, October 29, 2002 12:16 AM To: Marianne Bosley Subject: FW: METrak #12889 Crystal Field Review revised test report 2.PDF -----Original Message----- From: Alice Wong To: [email protected] Cc: [email protected]; EED - Choy, Kitty; [email protected] Sent: 10/28/2002 5:36 AM Subject: METrak #12889 Crystal Field Review Hi Marianne / Mr. Knight, Page 10 is shown fundamental and 10th harmonics emission. Page 11 is shown radiated emission from 30MHz to 1000MHz. Thanks. Best Regards Alice ----- Original Message ----- From: <[email protected]> To: <[email protected]> Cc: <[email protected]>; <[email protected]>; <[email protected]> Sent: Saturday, October 26, 2002 3:34 AM Subject: RE: METrak #12889 Crystal Field Review > Alice, thank you for the reply. The 2 attachments are much clearer and > satisfy the request. However, for the frequency of test I must not have > been very clear so I will try to be more descriptive in the need for > completion of this application. I see that on page 10 of the report there > is an indication that measurements were performed up to 9147MHz for the > Harmonics of the fundamental. Page 11 of the report shows the other > spurious emissions from the transmitter that are required to be either 50dB > down from the fundamental or to the 15.209 limit. On this page there is no > indication of the frequency range of measurements, and the highest frequency > listed is 205MHz. Please provide the start and stop frequency (frequency > range) for the measurements of the spurious emissions. > > I hope this clarifies the request. 2 > > Best regards, > > Chris Harvey > > Chris Harvey > MET Laboratories EMC > [email protected] > www.metlabs.com > 800-638-6057 x-310 > > > > -----Original Message----- > > From: Alice Wong [SMTP:[email protected]] > > Sent: Friday, October 25, 2002 7:23 AM > > To: [email protected] > > Cc: [email protected]; EED - Choy, Kitty > > Subject: METrak #12889 Crystal Field Review > > > > Dear Chris, > > > > Thank you for your reply, please see attached file for clearly circuit > > diagram and PCB layout photo. > > The fundamental and the spurious emission is recorded on test report page > > 10 > > and 11. > > > > Thanks. > > > > Best Regards > > Alice > > > > > > ----- Original Message ----- > > From: <[email protected]> > > To: <[email protected]>; <[email protected]> > > Cc: <[email protected]>; <[email protected]>; <[email protected]> > > Sent: Wednesday, October 23, 2002 9:31 PM > > Subject: METrak #12889 Crystal Field Review > > > > > > > Alice, I have reviewed the application for Crystal Field FCC ID NLHWCS20 > > and > > > found that the following items need to be cleared before issuance of the > > > Grant: > > > > > > 1) Please submit a clear and legible copy of the schematic diagram > > (copy > > > submitted is not legible). > > > 2) Please submit another photograph of the PCBoard component and solder > > side > > > with more of the PCBoard showing. The existing photographs are not > > clear 3 > > > and the PCBoard portion of the image is small and not good resolution. > > (I > > > would suggest that you get closer to the PCBoard to take the > > photograph). > > > 3) The Harmonics of the fundamental were apparently measured up to the > > 10th > > > harmonics of 914.7MHz, but there is no indication of the frequency range > > of > > > Spurious Emissions performed (the highest frequency listed is 205MHz). > > > Please specify the frequency range of spurious measurements. > > > > > > These items must be cleared before the application can be completed. > > > > > > best regards, > > > > > > Chris Harvey > > > Chris Harvey > > > MET Laboratories EMC > > > [email protected] > > > www.metlabs.com > > > 800-638-6057 x-310 > > > > > > > > > > -----Original Message----- > > > > From: Alice Wong [SMTP:[email protected]] > > > > Sent: Wednesday, October 23, 2002 6:48 AM > > > > To: [email protected] > > > > Cc: [email protected]; EED - Choy, Kitty > > > > Subject: Check NLHWCS20 status > > > > > > > > Hi Marianne, > > > > > > > > Would you help me check the NLHWCS20 status, our client want to know > > the > > > > job status. > > > > Thanks. > > > > > > > > Best Regards > > > > Alice << File: circuit.PDF >> << File: In-photo2.PDF >> <<revised test report 2.PDF>>

To: [email protected] Cc: [email protected] Subject: FW: METrak #12889 Crystal Field Review Just in case - I wanted to red flag this. -----Original Message----- From: Alice Wong To: [email protected] Cc: EED - Choy, Kitty; [email protected] Sent: 10/30/2002 10:17 PM Subject: Re: METrak #12889 Crystal Field Review Hi Chris, Please see attached file for revised test report. It have renew data and reduce pre-amplifier of correction factor (Gain). Thanks. Best Regards Page 1 of 1Compose Message 10/31/2002https://www.metlabs.com/exchange/forms/IPM/NOTE/cmpMsg.asp?obj=66689&call...

TEST SET UP PHOTOGRAPH OF THE PRODUCT MEASUREMENT OF RADIATED EMISSION TEST SET UP