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U1 C1, C2 S1 S2 STAMP 2 (original) 0.01- F 35-V capacitor Power switch, SPST toggle Normally open pushbutton switch
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5-V 30-mA minirelay (RadioShack) 9-pin RS-232 female connector Radio microphone connector STAMP 2 carrier board, PC board, headers, wire, chassis box, etc.
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RADIO MAILBOX
CONTENTS AT A GLANCE Basic Components
PROGRAMMING CONNECTIONS POWER SUPPLY
Operating the Radio Mailbox Radio Mailbox Parts List
Radio Mailbox Construction
The radio mailbox is the radio amateur s dream project. This fun and useful project is
one you ll want to build. The radio mailbox is much like a cell phone with a voice messaging feature. As an amateur radio enthusiast, you will immediately see the benefit of this project. As with your phone, you can t always be standing by, waiting for a call. The radio mailbox connects to your VHF/UHF ham radio transceiver s speaker or headphone jack and acts as a voice mailbox for incoming voice messages while you are away from your radio; see Fig. 14-1. This personal radio mailbox is simple to operate and will work with any radio transceiver or receiver. The radio mailbox sits in the background and looks for a touch-tone sequence to come across your radio s speaker. When the proper touch-tone sequence is generated, the radio mailbox immediately begins recording a voice message. After a message has been left, the radio operator leaving the message simply presses the digits #9 (pound-nine) to reset the radio mailbox for the next mesCopyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 181
182 RADIO MAILBOX
sage. The radio mailbox will take a number of messages up to 90 seconds long. The radio mailbox is ideal for leaving short messages to inform your friends of an upcoming meeting or event.
Basic Components
The radio mailbox centers around three major components: the touch-tone decoder chip, the ISD2590 voice message chip, and of course the BASIC STAMP 2 microprocessor (see Fig. 14-2). We use the original STAMP 2, but you can easily substitute the alternative STAMP 2. The first component we see in the project is the touch-tone decoder. The decoder chip is connected to your amateur radio transceiver s speaker or headphone jack, via capacitor C1 and resistors R1 and R2. The CM8880 touch-tone encoder/decoder is shown in the block diagram in Fig. 14-3. The CM8880 touch-tone decoder looks for a combination of tones for each numerical digit, as seen in Table 14-1. The touch-tone decoder receives and decodes the tone pairs and produces a binary value based on the valid digit received; the binary value is then fed to the STAMP 2. The CM8880 touch-tone IC decodes the incoming touch tones and produces a binary code, as shown in Table 14-2. If the number 4 is pressed on a remote touch-tone keypad, a binary value of 0100 will show up at the outputs D0 through D3 on pins 14, 15, 16, and 17 on the CM8880. This binary value is next sent to the BASIC STAMP 2 at U2. The touch-tone decoder IC is clocked by a 3.579-MHz color burst crystal at pins 6 and 7. The resistor and capacitor at C2 and R3 form a guard/time network that controls the incoming tone duration time limits. The CM8880 must be powered from a 5-Vdc power
Figure 14-1 Radio mailbox.
5V C1 Radio speaker or headphone R1 5V R2
1 2 3 4 5 6 20 19 18 17 16 15 14 13 12 11
Female DB-9
7 6 5 4 3 2
S1 J1
1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13
U1 CM 8880
C2 R3
P1 C3
U2 STAMP 2
7 8 9 10
5V R5
C7 R6 C4
1 2 3 4
28 16
C8 R7 5V
C9 C10 C11
12 13 14 15 20 21
U3 ISD 2590
U5 TLC 2471I
8 7 6 5
C12 C5 Sp O 5V C15 U6 C16 I 12V C6 R8 R9 C13 R10 C14
R12 17
1 2 3 4 5 6 7 8 9 10 23 27 24 25 26
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