KNZ48417Single Channel Family Radio Service Transmitter

To: Anthony Chan ITS/ES-HKG Cc: Ada WH Chan ITS/ES-HKG Subject: RE: DSI (HK) Limited FCC ID: KNZ48417 Dear Anthony: Thank you for the revised plot. I am concerned that it still does not display any effect of modulation limiting - that is, the modulation % flattens out, or stops increasing, as the input increases. Instead, this curve continued to increase rapidly as the input increases.above 137 dB - even though the actual frequency deviation at that level is well below the maximum allowed. I am going to request an FCC opinion on this situation, just to be sure. Regards, Roland -----Original Message----- From: Anthony Chan ITS/ES-HKG Sent: Tuesday, April 15, 2003 3:38 AM To: Roland Gubisch ITS/ES-Box Cc: Ada WH Chan ITS/ES-HKG Subject: RE: DSI (HK) Limited FCC ID: KNZ48417 Dear Roland, Pls find attached file as a revised plot. Due to our test equipment is during cal. and currently use equipment can't produce 144dB, So I use a approximation method for finding the frequency deviation. The approximate frequency deviation of 2500Hz at 144db is 0.05kHz << File: Mod-freq-temp-LPF6.xls >> Best Regards, Anthony Chan Lead Engineer Intertek Testing Services Hong Kong Ltd. ETL SEMKO Tel: 852-2173 8517 Fax:852-2742 9149 [email protected] www.etlsemko.com -----Original Message----- From: Roland Gubisch ITS/ES-Box Sent: Friday, April 11, 2003 6:27 AM To: Anthony Chan ITS/ES-HKG Cc: Ada WH Chan ITS/ES-HKG Subject: RE: DSI (HK) Limited FCC ID: KNZ48417 Dear Anthony: Thank you for the additional information, and please excuse the delay in responding. I have once again reviewed the test report, the exhibits and your reply to my original observations. There remain two issues: (1) the lack of agreement between the plot of modulation limiting characteristics and Table 3 of data; and (2) the lack of any evidence of modulation limiting. (1) Your exhibit "mlc.pdf" shows frequency deviation everywhere lower at 127 dB modulation input than at 117 dB. This does not correspond to the data in Table 3 of the test report. The data in Table 3, when plotted per the attached "ModLim.xls," continues to increase from 117 dB to 127 dB to 137 dB. This does not demonstrate modulation limiting. Please explain the discrepancy between the exhibit "mlc.pdf" and the data in Table 3; they should correspond exactly, and the plot should show the data points from Table 3 for 137 dB input. (2) You indicated that the occupied bandwidth was measured at an input of 144 dB, which should be with an input frequency of 2500 Hz, per 2.1049(a)(1). Please indicate the frequency deviation at that input level, so that the data point can be added to the correct modulation limiting curve. In order for this application to proceed to certification, modulation limiting must be clearly demonstrated. Thank you, Roland << File: ModLim.xls >> -----Original Message----- From: Anthony Chan ITS/ES-HKG Sent: Thursday, April 10, 2003 12:07 AM To: Roland Gubisch ITS/ES-Box Cc: Ada WH Chan ITS/ES-HKG Subject: RE: DSI (HK) Limited FCC ID: KNZ48417 Dear Roland, Is there any comments for my reply? Due to client need the Cert. urgently, and he also received RSS 210 Cert. If you have any other comments, pls kindly inform me. Thanks Best Regards, Anthony Chan Lead Engineer Intertek Testing Services Hong Kong Ltd. ETL SEMKO Tel: 852-2173 8517 Fax:852-2742 9149 [email protected] www.etlsemko.com -----Original Message----- From: Anthony Chan ITS/ES-HKG Sent: Monday, March 31, 2003 2:48 PM To: Roland Gubisch ITS/ES-Box Subject: RE: DSI (HK) Limited FCC ID: KNZ48417 Dear Roland, Thanks for your comments. The followings are my reply (1): No deviation data shown on the table at 137 dBSPL last time was due to no frequency deviation detecting during the measurement at these levels. (2),(3): The input sound level is 144 dBSPL which is the largest output from the sound source. Best Regards, Anthony Chan Lead Engineer Intertek Testing Services Hong Kong Ltd. ETL SEMKO Tel: 852-2173 8517 Fax:852-2742 9149 [email protected] www.etlsemko.com -----Original Message----- From: Wilbur Ng ITS/ES-HKG Sent: Thursday, March 27, 2003 9:09 AM To: Anthony Chan ITS/ES-HKG; Ivan Wong ITS/ES-HKG Subject: FW: DSI (HK) Limited FCC ID: KNZ48417 -----Original Message----- From: Roland Gubisch ITS/ES-Box Sent: Thursday, March 27, 2003 4:34 AM To: Wilbur Ng ITS/ES-HKG Cc: Danielle Gravelle ITS/ES-Box Subject: DSI (HK) Limited FCC ID: KNZ48417 Dear Wilbur: Review of this application is complete. Please respond to the following comments: 1) 2.1047(b) modulation limiting: The modulation limiting curve mlc.pdf does not extend to 137 dBSPL. The data in Table 3 have been re-plotted per the attachment to include 137 dBSPL, and modulation limiting is not demonstrated as required. << File: ModLim.xls >> 2) 2.1049 occupied bandwidth: What is the input signal level to achieve 16 dB above 50% modulation? It cannot be estimated from the modulating limiting chart, and appears to be much higher than 137 dBSPL. The occupied bandwidth is given as 1.15 kHz. This amount of deviation is not shown on the modulation limiting chart, and should be. 3) 2.1051 spurious emissions: What is the input signal level during spurious measurement? It does not appear in the test report. Thank you, Roland

From: Diane Poole [[email protected]] Sent: Friday, May 02, 2003 10:58 AM To: [email protected] Cc: Raymond Laforge Subject: Re: FW: TCB Query: Part 95B modulation limiting Hello Mr. Roland Gubisch, Yes, It it shows compliance, it can be granted. Regards, > -----Original Message----- > From: Roland Gubisch ITS/ES-Box > Sent: Wednesday, April 16, 2003 3:10 PM > To: 'Raymond LaForge' > Subject: TCB Query: Part 95B modulation limiting > > Ray: > > We are reviewing a very low sensitivity FRS radio. The plots of > frequency deviation vs audio input continue to rise at 134 dBSPL, showing > no limiting. On the other hand, the frequency deviation at 134 dBSPL (the > highest input possible for the test equipment, as claimed by the lab) is > extremely low: > > 140 Hz at 500 Hz input > 73 Hz at 1000 Hz input > 6 Hz at 2500 Hz input > > It is unlikely that the frequency deviation limit in 95.637(a) of /- 2.5 > KHz can ever be exceeded. May we certify this? > > Thank you, > Roland Gubisch > ITS >

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FCC ID: KNZ48417 Technical Description : The brief circuit description is listed as follows : - Q5 and associated circuit act as Oscillator. - Q7 and associated circuit act as TX RF Power Amplifier. - Q1 and associated circuit act as RX RF Amplifier. - Q3 and associated circuit act as AF Amplifier. FCC ID: KNZ-48417 Technical Description : The brief circuit description is listed as follows : - Q5 and associated circuit act as Oscillator. - Q7 and associated circuit act as TX RF Power Amplifier. - Q1 and associated circuit act as RX RF Amplifier. - Q3 and associated circuit act as AF Amplifier.

RF Exposure Information Output power is 48 μW ERP. Equivalent field strength at 3m is given by: E(dBμV) = ERP(dBm) + 107 -20 log 10 (measurement distance, m) or E(dBμV) = 84.27 dBμV/m (16350 μV/m), or -13.2 dBm This is comparable to the allowed field strength of exempt Part 15 devices, and is the level of spurious emissions of cabinet radiation allowed for most licensed devices. Therefore there are no particular RF exposure considerations to be met.

• The test results reported in this report shall refer only to the sample actually tested and shall not refer or be deemed a refer to bulk from which such a sample may be said to have been obtained. • This report shall not be reproduced except in full without prior authorization from Intertek Testing Services Hong Kong Limited • For Terms And Conditions of the services, it can be provided upon request. • The evaluation data of the report will be kept for 3 years from the date of issuance. Intertek Testing Services Hong Kong Ltd. 2/F., Garment Centre, 576 Castle Peak Road, Kowloon, Hong Kong. Tel: (852) 2173 8888 Fax: (852) 2785 5487 DSI (HK) Limited Application For Certification (FCC ID: KNZ48417) February 17, 2003 WO# 0301539 CKL/ February 18, 2003 INTERTEK TESTING SERVICES FCC ID: KNZ48417 i SUMMARY OF CONTENTS LIST OF EXHIBITS EXHIBIT 1:General Description EXHIBIT 2:System Test Configuration EXHIBIT 3:RF Power Output EXHIBIT 4:Modulation Characteristics EXHIBIT 5:Occupied Bandwidth EXHIBIT 6:Spurious Emission EXHIBIT 7:Frequency Stability EXHIBIT 8:Technical Specifications EXHIBIT 9:Product Labelling EXHIBIT 10:Photographs EXHIBIT 11:Instruction Manual EXHIBIT 12:Tune Up Procedure EXHIBIT 13:Part List EXHIBIT 14:Input Current EXHIBIT 15:RF Exposure Info INTERTEK TESTING SERVICES FCC ID: KNZ48417 ii MEASUREMENT/TECHNICAL REPORT Application:DSI (HK) Limited Trade Name/Model No:48417 Date:February 18, 2003 This report concerns (check one:)Original Grant X Class II Change Equipment Type: Family Radio Service, FRS Deferred grant requested per 47 CFR 0.457(d)(1)(ii)? Yes No X If yes, defer until: date Company Name agrees to notify the Commission by: date of the intended date of announcement of the product so that the grant can be issued on that date. Report prepared by:C. K. Lam Intertek Testing Services 2/F., Garment Centre, 576 Castle Peak Road, Kowloon, Hong Kong. Phone:852-2173-8502 Fax:852-2742-9149 INTERTEK TESTING SERVICES FCC ID: KNZ48417 iii Table of Contents 1.0 General Description................................................................................................................2 1.1 Product Description...........................................................................................................2 1.2 Related Submittal(s) Grants..............................................................................................3 1.3 Test Methodology..............................................................................................................3 1.4 Test Facility........................................................................................................................3 2.0 System Test Configuration....................................................................................................5 2.1 Justification.........................................................................................................................5 2.2 EUT Exercising Software...................................................................................................6 2.3 Special Accessories............................................................................................................6 2.4 Measurement Uncertainty.................................................................................................6 2.5 Equipment Modification.....................................................................................................6 3.0 RF Output Power (Section 95.639(d))..................................................................................8 4.0 Modulation Characteristics (Section 95.637(a))...............................................................12 4.1 Modulation Frequiency Response..................................................................................13 4.2 Modulation Limiting Characteristic.................................................................................15 4.3 Audio Low Pass Filter Response....................................................................................17 5.0 Occupied Bandwidth (Section 95.633(c)) .........................................................................19 6.0 Spurious Emission (Section 95.635(b)).............................................................................21 6.1 Field Strength of Spurious Radiation.............................................................................22 7.0 Frequency Stability (Section 95.627).................................................................................27 7.1 Frequency Tolerance........................................................................................................28 7.2 Temperature Extreme Condition.....................................................................................30 7.3 Voltage Extreme Condition.............................................................................................32 8.0 Technical Specifications.......................................................................................................35 9.0 Product Labelling.................................................................................................................39 10.0 Equipment Photographs....................................................................................................42 11.0 Instruction Manual.............................................................................................................44 12.0 Tune Up Procedure.............................................................................................................46 13.0 Part List................................................................................................................................48 14.0 Input Current......................................................................................................................50 15.0 RF Exposure Info...............................................................................................................…

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Modulation Limiting Characteristic 0.0000.1000.2000.3000.4000.500 47 57 67 77 87 97 107 117 127 Modulation Input (dB) Frequency Deviation (kHz) 500Hz1000Hz2500Hz3125Hz

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