Model 805 DTMF Microphone Operation and Maintenance Manual 01100750 Revision B2 CES WIRELESS TECHNOLOGIES 931-218 South Semoran Blvd.
Page 1 INTRODUCTION Your new CES Model 805 Universal DTMF Encoder Microphone is designed to provide superior and trouble free service. The 805 microphone can be used to dial DTMF telephone numbers from a mobile radio, in conjunction with a base station equipped with a telephone interconnect system.
Page 2 INSTALLATION The 805 Microphone requires 9VDC to 18VDC as a power source. If your 805 was shipped with a factory installed connector, then refer to the Application Note that is included, if any, for further instructions on modification of the radio to route this power source to the radio microphone connector jack. Some radio models have this power source already available and no modification is necessary. If your 805 was shipped with no connector installed, refer to Table 1.
Page 3 INSTALLATION - continued Continuous Tone Coded Squelch The 805 provides CTCSS or other tone decoder monitor or disable as a logical function that goes low or to ground whenever the microphone is placed on a grounded hang up clip. For applications that require a logical low or ground when the microphone is removed from the grounded hang up clip, contact the CES Sales Department.
Page 4 INSTALLATION - continued DTMF TONE OUTPUT LEVEL With the service monitor set up as in the previous test: press a DTMF key on the 805 and adjust potentiometer RV1 (accessible through the upper opening) for 2/3 of the level that modulation limiting occurs as observed on the service monitor. For instance, if modulation limiting occurs at 5.0 KHZ, then set RV1 for a DTMF tone modulation of 3.3 KHz.
Page 5 ADJUSTING TWIST The microphone generates two tones when any key on the keypad is depressed. The following table illustrates the row and column tones generated: Column Tones (Hz) Row Tones (Hz) 1209 1336 1477 697 1 2 3 770 4 5 6 852 7 8 9 941 * 0 # The actual frequencies generated are: Keypad Location Reference Tone (Hz) Actual Tone Output (Hz) Percent Deviation Row Tone 1 697 699.1 +0.30 Row Tone 2 770 766.2 -0.49 Row Tone 3 852 847.4 -0.54 Row Tone 4 941 948.
Page 6 JPR1 C6 C7 R25 JPR4 R12 Q3 CR5 U1 C15 CR6 C19 CR2 R16 CR3 C3 R1 R21 U4 C22 JPR2 P2 R23 R14 Q1 S1 L1 R22 R9 R20 J3 R10 È U5 C8 C18 R27 R28 Q4 Q2 U6 C14 È R19 R3 C9 C5 R8 R24 U2 C2 CR1 C16 C4 C20 R17 C10 U3 C13 C23 R29 R4 R5 È Q5 R7 C11 C17 R11 JPR3 R2 R18 R6 JPR5 R13 C21 R30 È CR4 C12 R26 RV2 RV1 Y1 < P1 R15
Page 7 DTMF BURST TONE MODE Model 805 microphones are shipped with the "Continuous Tone" mode enabled. To change to a "Burst Tone" mode, remove jumper JPR4 on the 805 printed circuit board. Refer to the Component Layout illustration for location of this jumper. When the 805 is in the Burst Tone mode, each time a key is depressed a burst of the applicable DTMF tone is generated for a period of 150 milliseconds, independent of how long the user holds the key depressed.
Page 8 Model 805 Parts List Reference Description CES Part # Reference Description CES Part # C1 C2 C3 C8 C9 C17 C21 C4 C5 C6 C7 C13 C10 C11 C12 C15 C14 C19 C16 C18 C20 C22 C23* Capacitor 10 uf CE106 Capacitor .1 uf 50V Capacitor 470 pf Capacitor .01 uf Capacitor 220 pf Capacitor 2.2 uf NP Capacitor 22 pf Capacitor 1 uf Capacitor 10 pf Capacitor 1500 pf Capacitor 100 uf Capacitor 2700 pf Capacitor .047 uf Capacitor .001 uf CM.1 CM471 CM.01 CM221 CE2.2NP CM220 CT1 CT10 CM152 CE107 CM272 CM.047 CM.
Limited Warranty CES WIRELESS TECHNOLOGIES (CES) warrants this product to be free of defect in material and workmanship and extends this warranty under intended use and normal service conditions to the original owner for a period of one year from the date of purchase.
