Mickel drawings

2 m transmitter for ARDF

This page contains drawings for a 2 m AM transmitter intended forARDF. This transmitter is designed to give 1 Watt output to a 50 ohm antenna.
The transmitter was designed for the 1994 World Championship inStockholm and has been used at most 2m competions since then. The transmitteris intended for 12 V supply.
Use the right mouse button to save the drawings, all drawings havesufficient resolution although they might look bad on the screen. You canprint them in correct size if you open the drawing in a image processingprogram.

 

Circuit diagram
 
The transmitter is made on a double side printed circuit board.Component side is covered by a a ground plane.
Circuit board layout on solder side
seen from component side.
On the component side most holes have to be countersink.
But at 39 points the components should be soldered at both sides,they are here marked by a big dot.
 
 
All holes should be 0.9 mm except for the one marked below.
Component placing
 
Components that should be soldered to ground plane on both sidesare morked with a large dot.
 
 
If you have comments or questions, email the designer  SM5CJW