User Manual

COMMUNICATION CERTIFICATION LABORATORY TEST REPORT: 73-6560

FCC ID: NQE1005

allowed.

is contact closed

sleep

Yes

1ms wakeup

1 to 255ms

debounce

Inc event count

is event count

equal

to preset count

Yes

advance TX channel

Transmit accumulator

count 37ms

setup PLL

4ms

Detailed Description

The 4 MHz crystal (Y1) will provide a reference clock for the synthesizer IC (U2) and the micro-

controller (U1). U1 will program the dividers in U2 to values that will select the appropriate

frequency. The output of U2 (pin 4) will be filtered (C14, R11, C15, R24, C35, C46, R33, C47,

R32, and C46) and will provide the tune voltage for the Voltage Controlled Oscillator (VCO).

The VCO consists of D1, D2, Q1, Q3 and their associated resistors, capacitors, and inductors.

The output of the VCO (Q3) will provide the feedback (via C19 and R20) for U2 (pin 8) and will

also feed the Power Amplifier. The Power Amplifier consists of a low pass filter (C49, L8, C50,

L9, and C51), Q2, Q5 and their associated resistors, capacitors, and inductors. The output of the

Power Amplifier (Q5) is then filtered by C33, C56, L10, C55, C24, C25, C62, C26, and C37.

The output of C37 will then feed the antenna (the antenna is etched on the PCB). Serial data from

U1-2 passes through a variable resistor (R2) and is low pass filtered by C41, R28, C42, R29, and

C43. This signal then modulates the VCO using D1, C38, and C36. R2 sets the frequency

deviation of the output frequency. When in “sleep” mode, U1 (pins 3 & 6) powers down the VCO

and power amplifier by setting the base voltage on Q4 and Q6 to a high voltage (3.6 volts). Prior

to transmitting, U1 pulls these two signals to a low (0 volts), which will apply power to the VCO

and power amplifier. JP1 is used as an interface to do “on-board” programming of the micro-

controller (U1). JP2-2 & 3 allows the battery (3.6 Volts) to be disconnected until the unit is

installed out in the field. J2-4, 5, & 6 will provide an external interface to U1.