Topband: Hi Z amplifiers for 160m

[Richard (Rick) Karlquist]

On 3/13/2020 12:34 PM, Richard (Rick) Karlquist wrote:
> 
> 
> On 3/12/2020 4:29 PM, Mikek wrote:
>>    I'll stick my neck out and suggest Dallas Lankford's '2 FET amp'.
> 
>>   If anyone has an interest, I have some more files in my computer.
>>
>>
>>> https://www.okdxf.eu/lankford/Hi%20Z%20PPL%20Loop%20And%20Flag%20Arrays.pdf 
>>>
>>
>> I
>>                                                   Mikek KF4ITA
>> _________________
> 

I didn't look at this circuit carefully; Mikek pointed out that
the JFET's are complementary, not in parallel.  (Thanks Mikek
for correcting me).  I also see that Lankford writes that his circuit is 
derived from Trask's circuit. In any event, the following reference by 
Chris Trask, N7ZWY gives a bunch of different versions of this circuit.

http://home.earthlink.net/~christrask/Complementary Push-Pull Amplifiers.pdf

Chris points out that this idea goes back to at least 1982.

Rick N6RK