Re: LF: Class d & E PAs

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hello Ken,

Recently i have discovered a very nice to read paper in the web. Current mode class D PAs are described. The basics are well explained as well as how to calculate the power from the supply voltage (ideal and real). I think this is a good choice for a class D PA on 137 and 500 kHz...
Hope this helps a bit.

73, Stefan/DK7FC

PS: http://sigma.ucsd.edu/research/articles/2001/2001_2.pdf
PPS: A class E PA is a nice circuit but needs a very accurate SWR and construction can be a bit tricky. However i built one for 1 kW on 137 kHz  at 80 VDC with 96% efficiency by using a single IRFP360...

Am 10.06.2012 22:28, schrieb Ken:

Dear All.

Thank you for your help on the DECCA info, so far I have not tried a Class D or E PA , my 500kHz TX having a power MOSFET in pseudso Class C, with Class D & E how is the PA output impedance calculated, for the output transformer, would it be permitted to use either a Pi or L-C_L (as I have done) to match the PA to the variometer and loading coil? .

 

73s

 

Ken

 

M0KHW