Ground Plane construction vs pre-printed "protoboards"
			 
			 
			
		
		
		
			
			For years I designed my boards in a time consuming way. I used 
Microsoft paint to draw the pattern. I printed this pattern on clear 
piece of 3M transparancy using my copy machine at work. Later I used my 
home laser printer. I cut and cleaned the board like Richard Hosking 
suggested. I then ironed the pattern on the PC board using a home 
cloths iron. I used doubled sided PC board. I have always surface 
mounted all my parts even leaded types. I used the lower side of the 
double sided board as a ground plane drilling holes only to attach 
ground leads below. I also placed as much ground plane on the surface 
of the board as possible. 
 
This method always worked well but I must qualify my building as being 
between 1.8 and 30MHz, nothing higher. In the last 7 or 8 years I have 
gone to Ugly construction. I read a quote attributed to W7EL Roy 
Lewellen about ugly construction years ago. The method I used was time 
consuming. I could save patterns for reuse and dupication but the whole 
classic PC board process is time consuming. I tried Roy's suggestion 
and never went back to my time consuming process. 
 
My first project years ago was updating a drifty 40M VFO. I measured 
the drift in the old VFO to 200 cycle/hr after 20min warmup. The new 
VFO using ugly construction measured at 20 per hour after warmup. Both 
used the exact same circuit, roughly the same component values but 
different manufacturer so the comparison is somewhat flawed. Recent 
projects using ugly construction: An new HB RF signal generator, 6W 
sideband transceiver, logarithmic RF detector and a 1.7 to 1.85MHz LO 
for a new sideband transceiver. This new VFO drifts 10 cycle/hr (47 
cycles over 24hr) but is still open to the environment on the 
workbench. 
 
I have used ugly construction in tube rigs, VFO's, high gain audio 
sections of DC receivers, test gear, etc. The one thing that makes it 
appealing is the ability to test a circuit or idea without going into 
the long process of PC board prep.  The ugly method is intuitive and my 
opinion...damn the appearance....does it work well! 
 
Don K5UOS 
 
PS John Miles' receiver is amazing! Wish he lived near me. 
 
		 
		
		
		
		
		
		
		
		
	
	 |