[Elecraft] K3 Birdies

[Joe Planisky]

I'm not suggesting that it would be possible to calculate a solution,  
but rather provide audio feedback to a program so it could do what I  
do: listen for a tone, adjust the shift until it disappears, tune up  
(or down) to the next 100 Hz segment, adjust the shift, repeat until  
you hit a segment with just noise.  (I'm also not proposing that it  
scan the whole band looking for birdies.  I'll do that.  But when I  
find one, I'll hit a button that says 'take it out'.)

73
==
Joe KB8AP

On Feb 20, 2009, at 7:21 PM, David Gilbert wrote:

>
> Personally, I don't think that's going to be likely.  The birdies  
> don't all tune in the same direction, and they all aren't in the  
> same position relative to a 100 Hz boundary.  As a result, some  
> birdies are best removed by a shift in one direction,  and others by  
> a shift in the other direction.  Birdies near a 100 Hz boundary  
> (i.e., 14174.101) often require both ... a shift in one direction  
> for one 100Hz segment and in the opposite direction for the adjacent  
> segment, but even that generalization is not always optimum.
>
> Since the birdies are mixer products of UHF harmonics and their  
> strength varies from rig to rig depending upon cable placement, I  
> don't think it's going to be very practical for the software to try  
> to know what generated a birdie on any particular frequency in order  
> to decide how best to remove it.
> For me, I'm just glad to be able to remove them manually.
>
> 73,
> Dave   AB7E
>
>
> Joe Planisky wrote:
>> I agree, the "birdie-be-gone" feature seems to work quite well at   
>> removing fast tuning birdies within the limitations of its current   
>> implementation. I hope there will eventually be software commands  
>> to  allow the process of removing a birdie to be automated.  It's  
>> not  hard, just a little tedious.
>>
>> 73
>> --
>> Joe KB8AP
>>
>>
>>
>>