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

12-09-2006

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

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

Radio Receiver

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

Receiver interface

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

Making of : preparing the 40 DIL on the ABC miniboard

Here we are preparing the ABC mini board on a 40 DIL socket.

07-09-2006

Making of 2 : preparing the photo-sensitive epoxy PCB

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

06-09-2006

Making of 3 : Peter etching the PCB

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

Making of 4 : placing the components

Finally starting the real work.

04-09-2006

Making of 5 : finally done

The complete PCB. Only find that last component.

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

Version 1.1 Alpha now fully operational!

Inhoud blog

	Welcome
	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
	About us

'73

Blog tegen de wet? Klik hier.
Gratis blog op https://www.bloggen.be - Meer blogs