WJ8888

14-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Welcome
Klik op de afbeelding om de link te volgen

Welcome to our site about the Watkins Johnson WJ8888/B2

This site is dedicated to our optocoupler interface which controls the WJ8888 by remote with Windows XP.


All electronics, designs, layouts, schematics and software codes remains property of Peter & Geert De Coninck.


the interface adds some new features to the radio receiver such as:
additional tuning with 100kHz, 1Mhz, 10MHz resolution
direct tuning with keypad
presets of frequencies
automatic up and downtuning of frequency with time interval
gain mode, if bw and detection mode fully controlable
extended memory to save radio settings
operating with RS232 or USB - RS232 converter

WJ8888 now also running with Windows Vista

last update February 2015



13-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.About us
Electronics and design: Peter De Coninck ONL4234

Living in Flanders, in the city of Antwerp, the Belgian major world port. Born in 1955, I got the radio bug as a kid from my granddad Jan De Coninck, who sailed in the 1930ies with the Belgian training tallship ‘ MERCATOR’ on a scientific expedition around the world, as a wireless operator.

http://www.premium-rx.org/photos.htm#onl4234

Software and electronics: Geert De Coninck

Bachelor in "bedrijfsmechanisatie @ VTIB Borgerhout 1994" and interested in technology, electronics and software, I started this adventure with my brother of designing the interface.

Special thanks and credits:

Byron Whartnaby (K3OY) - Escondido - California - USA
Mark Alberts - Almere Port - The Netherlands www.mcselec.com
Erik Salaj - Kosice - Slovac Republic
Dieter Suckale - Bad Vilbel - Germany
Alain Smolders - University of Antwerp - Belgium
Jan Hynneke - Demotech - Denmark
Our dad, for his unrelenting belief in the success of this project...
Peter's XYL, Yolande, for enduring our endeavours with PCB etching in her kitchen...

12-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Software
PC:

The entire Windows XP program is written in Borland C++ Enterprise 6.0.

Microcontroller:

The microcontroller firmware was written in BASCOM which is a Basic language based compiler for the Atmel microcontroller family. The machine code is programmed into the processor using the ABCEDIT software package.

http://www.mcselec.com/index.php?option=com_docman&task=cat_view&gid=99&Itemid=54

PCB Design and routing:

The PCB was entirely designed using the CAD software WinQCAD from Microcad.

11-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Hardware
The system consists of a synchronous communication board installed in the WJ8888/B2 receiver. This board is then connected by a special MIL connector to our optocoupler interface. Then it is connected by RS232 to the PC.

The hart of the interface is the ABC mini board with an Atmel AT90S8535 microcontroller mounted. The firmware in the microcontroller receives RS232 datapackages from PC and convert it to the 25kHz synchronous protocol used by the receiver. On command of the receiver the interface starts sending the datapackage.

Additional information about the Atmel family you can find here http://www.atmel.com/

10-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Radio Receiver
Klik op de afbeelding om de link te volgen Here we give some active links to sites with lot of information about the WJ8888.




http://www.radiomuseum.org/r/watkins_wj_8888_wj8888.html


http://www.premium-rx.org/wj8888.htm

http://watkins-johnson.terryo.org/

09-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Receiver interface
Klik op de afbeelding om de link te volgen The radio receiver is normally equiped with a 25kHz synchronous communication board.You can see a photograph of it right here.
The manufacturers part number of this board is 791200-1.

The synchronous communication is done by DS8820A and DS8830 IC's.

The DS7830 is a dual differential line driver that also performs the dual four-input NAND or dual four-input AND function.
TTL (Transistor-Transistor-Logic) multiple emitter inputs allow this line driver to interface with standard TTL systems. The differential outputs are balanced and are designed to drive long lengths of coaxial cable, strip line, or twisted pair transmission lines with characteristic impedances of 50Ohm to 500Ohm. The differential feature of the output eliminates troublesome ground-loop errors normally associated with single-wire transmissions.

The  DS8820A is a digital line receiver with two completely independent units fabricated on a single silicon chip. Intended for use with digital systems connected by twisted pair lines, they have a differential input designed to reject large common mode signals while responding to small differential signals. The output is directly compatible with TTL or LS integrated circuits.

08-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Making of : preparing the 40 DIL on the ABC miniboard
Klik op de afbeelding om de link te volgen Here we are preparing the ABC mini board on a 40 DIL socket.

07-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Making of 2 : preparing the photo-sensitive epoxy PCB
Klik op de afbeelding om de link te volgen

Ready for take off.
Here we are ready to fire some 300W UV ray's
onto a photo-sensitive epoxy PCB.


06-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Making of 3 : Peter etching the PCB
Klik op de afbeelding om de link te volgen Just counting the minutes for etching the PCB,
in the kitchen....
Wife standing by in background, wondering whether husband is beyond
salvation ...

05-09-2006
Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Making of 4 : placing the components
Klik op de afbeelding om de link te volgen Finally starting the real work.



Watkins Johnson WJ8888/B2 25kHz Optocoupler Interface
This site is not affiliated in any way with the Watkins Johnson company or DRS Technologies, the present owners of WJ Ga

Foto

Version 1.1 Alpha now fully operational!
Inhoud blog
  • Welcome
  • About us
  • Software
  • Hardware
  • Radio Receiver
  • Receiver interface
  • Making of : preparing the 40 DIL on the ABC miniboard
  • Making of 2 : preparing the photo-sensitive epoxy PCB
  • Making of 3 : Peter etching the PCB
  • Making of 4 : placing the components
  • Making of 5 : finally done
  • You Tube 1 : 25kHz signals
  • Screenshot 1 : PC software interface
  • Screenshot 2 : Start up screen
  • Screenshot 3 : LCD Mini Monitor Mode
  • Screenshot 4 : Maxi Monitor Mode
  • Screenshot 5 : TTL square wave analyzer
  • System overview
  • Optocoupler interface
  • Microcontroller
  • LCD
  • MIL Connector
  • Testing
  • Protocol
  • Watkins Johnson History
  • Lab
  • Links
  • Components
  • Open source
  • Schematics

    '73



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