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

[Carl]

The best way to tell if your CW signal is objectionable is to look at it on 
a spectrum analyzer which is built in to many SDR rigs, find someone running 
one and ask him.

"just" cutoff is a twilight zone and true Class C is very dependent upon the 
bias being at least 2X the cutoff voltage plus grid drive requirements are 
much higher in order to overcome that bias.

These days ham band Class C is only good for AM or FM. I run linears in Deep 
B for AM so say if idle current is normally 200 ma I run about 40 for 
improved efficiency and less wasted heat which keeps some marginal 
transformers happy.

Carl
KM1H



----- Original Message ----- 
From: "Steve Flood" <kk7uv at bresnan.net>
To: <amps at contesting.com>
Sent: Sunday, January 17, 2016 8:36 AM
Subject: Re: [Amps] Need for bias switch (CW/SSB)


>I have an adjustable bias where I can run a little ZSAC for Class AB.  But 
>I
> can dial the bias until it *just* cuts off and I often use this setting 
> for
> CW.  What class am I running when I do so?  I've heard it informally 
> called
> class B/C.   Running CW at that setting, or even a little deeper bias into
> Class C territory does not create any reported key clicks here.
>
> Steve KK7UV
>
>
>
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