Re: APF For K3

Posted by Bob-270 on Oct 24, 2010; 6:59pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5668412.html

I found the "AF Tune"  peaking function in the old Kenwood TS930 to be
quite useful.

Is that similar to the desired implementation or was it something
different?

73,
Bob
K2TK


On 10/24/2010 2:47 PM, Paul Christensen wrote:

>> I found the APF in my Icom 7800 worthless.
>>      
> Same here.  Icom's implementation of APF in the '7700/'7800 is really an
> "Audio Passband Filter" with low Q.  It's really no different than narrowing
> a DSP passband filter.
>
> What's unique about the FT-1000D's APF is that the Q is very high, although
> its affected with APF tuning.  The high Q of the circuit forms a very narrow
> filter with fixed gain, and variable peaking frequency.
>
> Paul, W9AC
>
>
>    

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