LL4ET-803

Ecen Electronics Co Ltd

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Application Details

Equipment Class: TBT - Licensed Broadcast Transmitter Worn on Body
Date of Grant: Oct 12, 1999
Application Purpose: Original Equipment
Date of Application: Aug 31, 1998
Frequency Range: 174.00000000 - 216.00000000
Company: Ecen Electronics Co Ltd
Country: Taiwan

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Document Text

Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.

Attestation Statements

(1) The subject device is a part 74 transmitter with pilot tone function and a intermodulation device (Please refer to the block diagram and circuit diagram). The frequency of the pilot tone (as shown in the circuit diagram) is 32.768KHz. (2) There are steps when do the occupied bandwidth measurement with 13KHz modulating frequency: (I) 132KHz intermodulation with pilot tone: Because the subject device is a “ narrow band modulation ” device, then according to the formula, we can get: (a) two fundamental frequencies: F1=32.768KHz, F2=13KHz (b) harmonics: F1-F2, F1+F2, F1-2F2, F1+2F2, 2F1-F2, 2F1+F2,........... (19.768KHz, 45.7689KHz, 6.768KHz, 58.768KHz,.......) (II) Transmitted: The formula of the Narrowband FM Modulation: e(t) = A·cosωct + (M·A)/2·cos(ωc+ωm)t + (M-A)/2·cos(ωc-ωm)t ωc = 192.231MHz = Carrier Frequency ωm = 32.768KHz, 13 KHz, 19.768 KHz, 45.768 KHz, 6.768 KHz, 58.768 KHz,...... = two fundamental frequencies + harmonic frequencies = modulating frequencies A·cosωct (M-A)/2·cos(ωc-ωm)t (M·A)/2·cos(ωc+ωm)t 192.231MHz