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T-238 Assembly Manual 

Rev. 1 February 2001 

Page 2 of 11 

Contributed files can be found at 
ftp://ftp.tapr.org/wxsig/software/.  Files can be 
anonymously uploaded to ftp://ftp.tapr.org/wxsig/upload/. 

 

T238 is discussed on the Weather Special Interest Group 
(WXSIG).  You can join WXSIG via the web at 
http://www.tapr.org/cgi-bin/lyris.pl?join=wxsig. 
 

Acknowledgments 

The Tucson Amateur Packet Radio T238 Kit was made 
possible by the efforts of (in alphabetical order): 
 
William Beals, N0XGA - Conceptual Designer 
Steve Bible, N7HPR - Project Manager 
Joe Borovetz, WA5VMS - Parts Liaison 
Russ Chadwick, KB0TVJ - Conceptual Designer 
Greg Jones, WD5IVD - Asst. Project Manager 
John Koster, W9DDD - PCB Design 
 
And Beta Testers: 

 

Rex Blaine, KI0BJ 

Jim Blair, WA5MYI 

Steve Dimse, K4HG 

Joe B. Dorn, W5VEX 

Russ Hummel, WB4PGT 

Doug McKinney, KC3RL 

Gerald Marchant, WB5NZV 

Aaron Morrison, AE4KO 

Brian Riley, KA2BQE 

Guy Story, KC5GOI 

 

PARTS LIST 

The parts list is organized by quantity and part type.  Verify 
that all parts are present by checking in the [  ] as you 
locate the part in the list. You may wish to take this 
opportunity to sort the parts into a compartmented 
container such as an egg carton or muffin tin as you 
inventory them. This will aid you in kit building. 
 

Resistors 1/4 w, 5% Carbon Film:

 

[  ] (1) 10 

Ω

 (brown-black-black)  

R14 

[  ] (1) 470 

Ω

 (yellow-violet-brown-gold)  

R12 

[  ] (1) 2.2K 

Ω

 (red-red-red-gold)  

R1 

[  ] (1) 1.5K 

Ω

 (brown-green-red-gold)  

R11 

[  ] (9) 10K 

Ω

 (brown-black-orange-gold)  

R2-R10 

 

Resistor 1/2 w, 5% Carbon Film:

 

[  ] (1) 4.7 

Ω

 (yellow-violet-gold) 

R13

 

 

Resistor, Trimpot 

[  ] (1) 10K 

Ω

 Trimpot (103)  

V1 

 

Capacitors 

Capacitors may be marked in various ways. The typical 
markings are listed but may vary. Find all that match and 
the remaining ones, if any, should become apparent by 
elimination. 
 

Mylar or Monolithic 

[  ] (5) 0.1 uf (104)  

C3-C7  

 

Electrolytic or Tantalum 

[  ] (5) 1uF (105 or 1+35) 

C8-C12 

[  ] (2) 10 uf  

C1, C2 

 

Diodes 

[  ] (2) 1N4148 Silicon Diode  

D2, D3 

[  ] (1) 1N5817 Schottky Diode  

D1 

 

Light Emitting Diode 

[  ] (1) Red T1  

DS2 

 

Inductors 

[  ] (8) Ferrite Beads  

L1-L8 

 

Integrated Circuits 

NOTE: Do not handle the ICs at this time!  Carefully 
remove the black foam carrier with ICs from the bag and 
verify the ICs against this list.  Do not touch the ICs! Leave 
them in the protective foam. 
 
[  ] (1) MC68HC908GP32CP  

U3 

[  ] (1) MAX232 or HIN232  

U4 

 

Voltage Regulators 

[  ] (1) 7805 TO-220 case  

U5 

 

Crystal Oscillators 

[  ] (1) 32 MHz  

U1 

[  ] (1) 9.8304 MHz  

U2 

 

IC Sockets 

[  ] (1) 16-pin DIP Socket  

U4 

[  ] (1) 40-pin DIP Socket  

U3 

 

Switches 

[  ] (4) SPST Momentary push buttons 

SW1-SW4 

[  ] (1) DPDT Momentary push button 

SW5 

 

LCD Display 

[  ] (1) 4 line by 20 character LCD module 
 

Connectors 

[  ] (1) 2-pin Molex polarized male header  

J8 

[  ] (1) 2-pin Molex polarized plug housing 
[  ] (2) Molex crimp pins 
[  ] (2) 1x3-pin male header  

OJ1, OJ2 

[  ] (1) 2x5-pin male header 

J9 

[  ] (1) 2x8-pin male header 

J6 

[  ] (2) 1x17-pin male header  

J10 

[  ] (2) 2-pin Jumper, Push-On 
[  ] (2) DE9 Female PCB right angle mount 
[  ] (1) DE9 Male PCB right angle mount 
[  ] (1) 2.1 mm Coaxial Jack  

J1 

[  ] (1) 2.1 mm Coaxial Plug  

P1 

[  ] (1) RJ-11 6-6 connector PCB mount  

J2 

 

Miscellaneous 

[  ] (1) Printed Circuit Board (Rev 3) 
[  ] (1) Assembly Manual (this document) 
[  ] (1) Flat Ribbon Cable Assembly 
[  ] (1) TO-220 heat sink  
[  ] (1) 4-40 x ¼” screw 
[  ] (6) 4-40 x 3/8” screws 
[  ] (7) 4x40 nuts 

Содержание T-238

Страница 1: ...tended for use with the Dallas Semiconductor 1 Wire bus and any device that needs a serial connection Four push button switches and a Liquid Crystal Display LCD provide the user interface The initial application for the T 238 is a controller that accepts data from a Dallas Semiconductor weather sensor unit processes it and formats it for sending either directly to a Terminal Node Controller TNC fo...

Страница 2: ...tor 1 2 w 5 Carbon Film 1 4 7 Ω yellow violet gold R13 Resistor Trimpot 1 10K Ω Trimpot 103 V1 Capacitors Capacitors may be marked in various ways The typical markings are listed but may vary Find all that match and the remaining ones if any should become apparent by elimination Mylar or Monolithic 5 0 1 uf 104 C3 C7 Electrolytic or Tantalum 5 1uF 105 or 1 35 C8 C12 2 10 uf C1 C2 Diodes 2 1N4148 S...

Страница 3: ...ayout diagram for clarification of parts placement All references to up down left and right assume that you are looking at the PCB with the text right side up that is the four switches are at the bottom and the five big connectors are at the top Resistors Resistors have a lead spacing of 0 4 and should lie flat on the PC board You may wish to use a lead former to pre form the resistor leads for ne...

Страница 4: ...oldered connections or cold gray and or grainy looking solder connections OK so far This completes the IC socket installation Capacitors All capacitors should be mounted as nearly flush to the board surface as practical without stressing the leads Install the following capacitors C3 0 1 uF 104 C4 0 1 uF 104 C5 0 1 uF 104 C6 0 1 uF 104 C7 0 1 uF 104 Solder and clip the leads 10 total Electrolytic a...

Страница 5: ...arked on the PCB with a square pad Pin 1 on the crystal oscillator is marked with a black dot and or an edge of the can that is square instead of rounded CAUTION Make certain that the U1 metal housing does not short to nearby R10 or R12 U1 32 000 MHz U2 9 8304 MHz Solder and clip the leads 8 total Connectors Gently rock the RJ 11 connector until it snaps into place and solder the leads J2 RJ 11 co...

Страница 6: ...x16 pin male header with pins facing to the rear of the LCD module and in holes 1 through 16 NOTE J8 on the PCB is an alternate connection for powering the LED backlight on the LCD There will be a red and black wire a polarized Molex plug housing and two pins remaining These are for LCD displays that do not have a 16 pin header but rather a 14 pin header Pins 15 and 16 supply power to the LED back...

Страница 7: ...as components heating up smoke or smell Remove power immediately if anything unusual appears Place the ground lead of your voltmeter on pin 2 of U3 This will be the ground reference for the rest of the measurements Measure the voltage on the voltage regulator U5 on the pin furthest from the power jack It should be between 8 and 14V If it is 0V then L1 is likely missing or damaged If it is low the ...

Страница 8: ...t U4 Pin 2 Greater than 8V Check IC socket C8 C9 C10 C11 U4 Pin 6 Less than 8V Check IC socket C8 C9 C10 C11 Remove power from the T238 Locate the flat ribbon cable Notice that one of the leads nearest one of the edges is a bluish color compared to the rest This lead denotes pin 1 You may wish to place another indication of pin 1 such as a sticker on the connectors WARNING Polarity of the flat rib...

Страница 9: ... not cause any damage but the unit will not work Some telephone cables reverse the wires and some do not In addition some telephone cord couplers reverse the wires Find a telephone cable that does not reverse the wiring Hold the connectors side by side and oriented the same direction for example the clip tab down on both connectors Observing the red and green wires inside If for example red is on ...

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