Based on that PCB, I want to see an sweep to at least 1GHz. The reason is that experience have shown that the inductance (perhaps 10nH) in series with C2 and C6 would damage the stop-band rejection at UHF.
Used with an OXCO this would not matter, but the desire to make the ultimate filter is still there. Thomas. 2012/6/21 <li...@lazygranch.com> > If the output is buffered, there really shouldn't be a problem. > > Incidentally, I can crank out high order LCR filters all day just by > transforming prototypes out of Zverev. But it has been my experience at > even 10MHz the parasitics of the elements will throw off the design. > > > -----Original Message----- > From: Bob Camp <li...@rtty.us> > Sender: time-nuts-boun...@febo.com > Date: Wed, 20 Jun 2012 17:49:37 > To: Discussion of precise time and frequency measurement< > time-nuts@febo.com> > Reply-To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] 10 MHz low pass filter > > Hi > > That's a pretty high order filter. The output of most OCXO's already has a > filter on it. Combining two filters (especially high order ones) without > isolation between them is not a good idea. The resulting transfer function > will not be what you expect it to be…. > > Bob > > On Jun 20, 2012, at 4:54 PM, Joseph Gray wrote: > > > I came across this filter design recently and thought I'd build a few. > > > > http://www.jwmeng.com/AppNote/AppNote003.html > > > > I was about to place a Mouser order when I came across someone selling > > filters, based on the above design. > > > > http://www.ebay.com/itm/10-MHz-filter-kit-for-tcxo-gps-pll-/110893777470 > > > > The price with a board seemed low enough that I ordered a few. I'll > > let everyone know how they work out. > > > > Joe Gray > > W5JG > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Please avoid sending me Word or PowerPoint attachments. See <http://www.gnu.org/philosophy/no-word-attachments.html> PDF is an better alternative and there are always LaTeX! _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
