As I begin to experiment with component layout on an amp ("playing
chassis-chess"), the biggest hurdle is trying to maintain the requisite space
around the pi and L coils. I wound them 3" diameter 10 AWG. My reading has
informed me to keep the coils 'half the coil diameter' away from the RF
compartment walls and tuning/loading capacitors. This really eats up some
space in the RF compartment! When I look at photos of commercial amps or even
other homebrew amps, I notice this spacing is not adhered to. I could save
sapce by using just a pi tank, but again my reading indicates that the pi-L is
better engineering pracitce. So now my questions...
1. How critical is this spacing guideline? How close can you actually place
the coils before Q is affected or other bad things happen? How do the
commercial amps get away with it?
2. It seems most of the homebrew and Handbook amps I see are Pi tanks. Is the
Pi-L really necessary?
Thanks,
Steve KK7UV
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|