I wonder if you could be talked into laying out the board for 5th or 7th order filters and those that want just a wide filter can jumper past the undeeded sections?
And while I am making requests, how about laying it out so that it has pads to support elliptics? The 160m Softrock could be helped by an elliptic to reduce interference from powerful AM stations at the top of the MW band. In other words, I'd love a general purpose passive filter proto board. Chuck >From: "David Brainerd" <[EMAIL PROTECTED]> >Reply-To: [email protected] >To: [email protected] >Subject: [soft_radio] Re: SDXCVR Board Production >Date: Tue, 06 Jun 2006 00:56:25 -0000 > >Chuck: > > The Bandpass Filters are 3 pole Chebychev. They were designed >and simulated using RFSIM99. They are fairly wide since the filters >were designed for a general coverage receiver rather than ham band >only. They are laid out for SMD caps and inductors. The layout is >posted at ><http://users.wildblue.net/wb6dhw> > > The layout will be changing slightly because I need to add biasing >on the switches( done on the schematic), I am going to separate the RF >ground from the supply ground, and I am going to include provision for >a 1 to 1 transformer on the input. > >Dave - WB6DHW >--- In [email protected], "chutton12000" <[EMAIL PROTECTED]> wrote: > > > > David: > > > > Can you tell us a little bit about the bandpass filter? > > Butterworhth, Chebychev or Elliptic? How many orders? > > > > I'd be interested in acquiring a few of them if they are being laid > > out in a way that makes filter prototyping easy: pads for both the > > common Toko tunable inductors and inductors with leads and small > > toroids. > > > > Chuck > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get to your groups with one click. Know instantly when new email arrives http://us.click.yahoo.com/.7bhrC/MGxNAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
