From: Pete Rawson <peterawson@earthlink.net> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Message-ID: <1027D446-FE23-45A7-88AD-1CFD339C4ABB@earthlink.net> Content-Type: text/plain; charset=us-ascii Clay, I would really like to have a copy of your test board for this effort. I'm sure it will be a challenging layout. But it could be a very handy piece of hardware. Supporting a PCA order would easy to do. Pete Rawson I always buy more than one PCB, 5 - 6 don't cost any more than 1.  Unfortunately, I don't think my favorite prototype shop (PCB123) will be suitable for a layout with voids in the ground plane (reduce parasitic C) under the opamp and R4003C on the top layer, so I will have to do a 'real' PCB.  I was also planning on using the leadless version of the part, which could be challenging for home assembly. Everything is leadless these days.  Gives me fits sometimes.  I just went through a nightmarish experience with a leadless ARM7 processor that needed some wires added.  I replaced it with a leaded part at a cost of 2 mm PCB area  . . .   but I digress. Clay

Clay, I'm not sure what the "leadless" package looks like, so I'll check it out. The only older leadless packages I can't deal with are BGA and the leadless ceramic chip carrier. Would you send me a complete P/N to be sure I'm looking at the right thing? This would still be a very useful accessory, even if the reverse isolation results were down to 60dB. Pete On Feb 20, 2010, at 12:46 PM, life speed wrote: > From: Pete Rawson <peterawson@earthlink.net> > Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Message-ID: <1027D446-FE23-45A7-88AD-1CFD339C4ABB@earthlink.net> > Content-Type: text/plain; charset=us-ascii > > Clay, > > I would really like to have a copy of your test board for this effort. > I'm sure it will be a challenging layout. But it could be a very handy > piece of hardware. Supporting a PCA order would easy to do. > > Pete Rawson > > I always buy more than one PCB, 5 - 6 don't cost any more than 1. Unfortunately, I don't think my favorite prototype shop (PCB123) will be suitable for a layout with voids in the ground plane (reduce parasitic C) under the opamp and R4003C on the top layer, so I will have to do a 'real' PCB. I was also planning on using the leadless version of the part, which could be challenging for home assembly. > > Everything is leadless these days. Gives me fits sometimes. I just went through a nightmarish experience with a leadless ARM7 processor that needed some wires added. I replaced it with a leaded part at a cost of 2 mm PCB area . . . but I digress. > > Clay > > > > > _______________________________________________ > 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.