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 > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
