[Elecraft] K3:New APF what happened?

[Vic K2VCO]

It can be proven mathematically that the speed at which information can be sent decreases 
as the bandwidth of the channel decreases. One of the ways of increasing the signal/noise 
ratio of a channel is by narrowing it, but there's a trade-off -- you have to slow down 
the data rate. In our case, this means that the ringing will cause the dits to run 
together unless you ask the guy to QRS!

If the s/n ratio is good with a wider bandwidth, then you don't need the APF. Turning it 
on will reduce the top speed that can be used.

There's no free lunch!

On 11/17/2010 8:31 AM, K4IA at aol.com wrote:
> I am not too impressed as the hollow ringing sounds like a regenerative
> receiver going into oscillation.  It can help you distinguish the  dits but it
> isn't pretty listening.   I think the manuals need to  catch up with the
> betas so I can get more comfortable with the  adjustments.
>
> Buck
>
> k4ia
> k3#101

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/