[Elecraft] K3 Filter Plots

[Joe Subich, W4TV]

Note: when using Mike's software, AUTOINF must be set to NOR. 
Anyone who normally has AUTOINF=1 (e.g. for a SteppIR antenna) 
will need to manually reset it before using the software in 
order to get usable data. 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jack Smith
> Sent: Wednesday, January 14, 2009 2:09 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 Filter Plots
> 
> 
> I recommend Mike's program to anyone interested in their K3's filter 
> response. It's relatively simple to use and will give you a 
> good view of 
> the first 60 to 70 dB of the filter response.
> 
> For a variety of reasons, measuring the K3's filter skirt 
> selectivity at 
> frequencies where the filter's attenuation exceeds 60 or 70 dB using 
> simple equipment and procedures is difficult.
> 
> Jack K8ZOA
> 
> Verizon Mail wrote:
> > Bill W4ZV wrote:
> >   
> >> Someone else asked about the filter plots on the Elecraft 
> and Inrad 
> >> websites.  I believe all of these were made by George W2VJN before
> >> he sold
> >> Inrad to N5KO and AG9A.  I hope Elecraft or Inrad might 
> ask George  
> >> to graph
> >> the missing filters (all 5-pole and some 8-pole) eventually  
> >> (including the
> >> yet to be introduced variable bandwidth filters).  If 
> George cannot  
> >> do it
> >> perhaps Jack K8ZOA could do this.
> >>
> >> 73,  Bill  W4ZV
> >>
> >> I asked the question about the filter plots. I have written a
> >> program, with Jack's considerable help, that will allow a 
> K3 to self- 
> >> characterize it's filters. As each filter is characterized 
> the data  
> >> set can be saved by the user and a simple plot drawn by 
> the program.  
> >> All the user needs is a stable, clean signal source to 
> inject into  
> >> the K3 antenna port. An advantage of this approach over the INRAD/ 
> >> Elecraft plots is they are generated while the crystal filter is  
> >> installed in the user's K3, not in a test jig in a laboratory.
> >>     
> >
> > The program is called K3 Filter Tools and can be downloaded 
> free from: http://mysite.verizon.net/ks7d
> >
> > Mike, KS7D
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