[Lowfer] Class E vs. Class C what's your opinion ?

[Ed Phillips]

 Hello Chris: thanks for your reply. Yes I would
appreciate your article very much. " You never get too
old to learn. " I've been a class " C " A.M. man for
Boo-Koo's of years, now might be a good time to
experiment. emailme at: ku4xr at yahoo.com
73, OM and have a great day. Andy - KU4XR

--- Chris Trask <christrask at earthlink.net> wrote:


>>     For overall efficiency you can't beat Class E. 
>> I wrote a paper for an
>> IEEE conference years ago for calculating the
>> inductor and capacitor values,
>> and if it would be of any help I can send you a PDF
>> copy.
>> 
>> Chris"
>  
>
    There is also a good Class E design program [and a lot of other 
useful stuff] here:

    http://www.tonnesoftware.com/index.html

       At the moment Dave Curry, WD4PLI [can't remember his Part 5 
call], has a simple Class E CW beacon transmitter running about 120 
watts using a pair of TO-220 FETS.  It's a very simple gadget and runs 
without external cooling. 

    One problem with Class E amplifiers is the high harmonic content of 
the output so adequate filtering is essential if you're going to put 
something on the air.

    I haven't seen any specific mention of Class E AM transmitters but 
suppose it would be a simple matter to modulate the drain circuit as one 
woult with a Class C amplifier.  In such application it would be 
particularly important not to exceed the FET breakdown voltage.

Ed