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transmitter and receiver are on two different frequencies; i.e., on the 2-m amateur band, the receiver and transmitter are separated by 600 kHz, so as not to interfere with each other. Repeaters are usually coordinated with a governing body to assure that other repeaters do not interfere with each other and to control overlap between repeaters. Once again, the BASIC STAMP 2 comes to our rescue in designing a ham radio repeater controller. The amateur radio repeater in this chapter can perform a number of repeater functions. The repeater controller contains a touch-tone decoder that can be used to remotely control the system. The repeater also can act as a beacon and send out an ID signal to identify itself every 5 minutes. The system also has a time-out timer, roger-beep, and burglar alarm feature, and an optional continuous tone coded squelch system (CTCSS) control feature with the optional TS-64 board from Communications Specialists.
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The ham radio repeater controller is shown in Figs. 16-3 and 16-4. The diagram in Fig. 16-4 shows the brain of the repeater controller, i.e., the original BASIC STAMP 2 microprocessor. Fifteen data I/Os are used in the ham radio repeater project. The receiver audio output is connected to pin 4 of J3. The audio input from receiver section is fed to both the analog switch at U1 via R1, C1, and C4 and then to then touch-tone decoder chip input at U2. The audio to both U1 and U2 is controlled via two 20-k potentiometers. The Mitel 8870 touch-tone decoder chip is a complete DTMF receiver combining both a band-split filter and digital decoder, as shown in Fig. 16-5. The filter section uses switched capacitor techniques for the high and low filter groups. The 18-pin decoder chip uses a digital
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Figure 16-3 Radio repeater circuit board.
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S1 D1 PWR CTCSS, in active low R13 R14 5V R17
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1 2 3 4 5 6 7 8 9 10 11 12 TX RX ATN GND P0 P1 P2 P3 P4 P5 P6 P7
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C2 R2 R1
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2 4 5 10 18 9 6 5
8 7 17
C12 S2 C11
5V C4 J2
16 15 14 13 12 11
R15 R16 5V COR/CAS Q2 5V
3 4 5 6 7 8 9 10
14 7 13
U3 STAMP 2
R6 PTT
4 7 U4 LM386 5 3
C6 R7 C9 R9
VCC GND RS 5 P15 P14 P13 P12 P11 P10 P9 P8
24 23 22 21 20 19 18 17 16 15 14 13
R18 R19 Q3 AUX2
AUX1
R10 R11 5V R22
C8 5V
Active low alarm input
Figure 16-4 Ham repeater schematic.
BASIC COMPONENTS 211
code converter and latch, in concert with a digital detection algorithm to detect and decode all 16 DTMF tone pairs into a 4-bit code; see Table 16-1. The M8870 touch-tone decoder requires only a few components, and the chip pinouts are shown in Table 16-2. The touch-tone decoder receives audio control information from the receiver and processes it, through the STAMP 2. The binary digital outputs from the touch-tone decoder, i.e., Q1 through Q4, are fed directly to the STAMP 2 controller on pins 11, 12, 13, and 14. The 8870 touch-tone decoder also outputs a delayed steering output signal (StD) on pin 15. The delayed steering logic output presents a logic high signal when a received tone pair has been registered and the output latch updated. This output returns to logic low when the voltage on St/GT falls. Note the StGT is the steering input/guard time; see data sheets for the 8870 decoder in App. 1 on the CD-ROM. The audio output to the repeater s transmitter is coupled to J3 on pin 3. The output from the STAMP 2 on pin P7 is fed to the network of R9, R10, R11, and C11, and the output from the analog switch on U1 is sent to the LM386 along with the attenuable signal from the STAMP 2. The output of the LM386 is then input to J3-3. The STAMP 2 controls the transmitter via the PTT control transistor at Q1. Table 16-3 lists input and output connections at the J3 pins. The COR/CAS or carried operated relay output from the repeater receiver is connected to J3-10. The COR/CAS input is also tied to the STAMP 2 on P6. The PTT (push to talk) line to the repeater transmitter is controlled by the output of the STAMP 2 at P7, which controls the transistor at Q3. The repeater controller also has two auxiliary control functions handled by AUX1 and AUX2.
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