[Amps] Need for bias switch (CW/SSB)

[Paul Christensen]

A class C amp will preserve the CW waveform in a linear region of operation, provided there's a means to sequence it out of class C during the T/R cycle and when the amp key line is active.  Typically two and three stage bias is used but other clever methods have been designed over the years.  

Paul, W9AC

Sent from my iPhone6

>> On Jan 13, 2016, at 3:41 PM, Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
>> 
>> I don't think this is true. Class C will generate terrible key clicks because it won't preserve the keying envelope.
>> 
>> Kim N5OP
>> 
>> "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
>> 
>>> On Jan 12, 2016, at 09:24, Mike Feher <n4fs at eozinc.com> wrote:
>>> 
>>> In CW it can run Class C, but for SSB it has to be linear. 73 - Mike 
>>> 
>>> Mike B. Feher, N4FS
>>> 89 Arnold Blvd.
>>> Howell, NJ, 07731
>>> 732-886-5960 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Charlie
>>> Sent: Monday, January 11, 2016 1:17 PM
>>> To: amps at contesting.com
>>> Subject: [Amps] Need for bias switch (CW/SSB)
>>> 
>>> Folks-
>>> 
>>> I am putting a 8877 amp together. I was wondering why  some amps have a
>>> "CW/SSB" switch.
>>> Assuming the power supply can handle cw key down, other than higher
>>> efficiency, what other reason could there be for this switch?
>>> 
>>> Thanks!
>>> 
>>> Charlie N6CFH
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>> 
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps