Some of the wider filters in that paper are pretty good. The narrowest filters are not so good. The flat part of the passband has constant group delay. The skirts are awful
For narrow filters it starts going weird. Larry Lopez [via Elecraft] wrote: > It turns out that the Elecraft 2.7 KHz 5 pole filter is the winner > according to: > > http://www.qsl.net/gm3woj/k3filtertestssn2203.pdf > > which makes me want to make my own filter. > Still, I'm going to keep the 400Hz 8 pole filter which > is coming with my S/N 27xx Elecraft Radio !!! > > > ------------------------------------------------------------------------ > If you reply to this email, your message will be added to the > discussion below: > http://elecraft.365791.n2.nabble.com/What-crystal-filters-for-the-K3-are-linear-phase-delay-constant-group-delay-tp7587633p7587774.html > > > To start a new topic under [K3], email > ml-node+s365791n365792...@n2.nabble.com > To unsubscribe from Elecraft, click here > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=365791&code=bGF3bG9wZXozQGdtYWlsLmNvbXwzNjU3OTF8MjU5MTAzNDE2>. > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > > -- View this message in context: http://elecraft.365791.n2.nabble.com/What-crystal-filters-for-the-K3-are-linear-phase-delay-constant-group-delay-tp7587633p7587779.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
