Message: 3 Date: Thu, 11 Feb 2010 23:02:30 -0500 From: Bob Camp <lists@cq.nu> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution     (Clay) Hi I suspect your noise spike can be cured by a series R-C to ground from the junction of Q1 base, Q7 base and all the other stuff. Something is going to have to set a high frequency roll off. With no coils some combo of R and C is going to have to do it. You might also try returning all of the upper emitter resistor bypasses to ground rather than B+. Another alternative would be emitter to emitter bypass as shown on the JPL schematic. I'm guessing both would improve isolation in a real world circuit. Bob Hi Bob, Please provide a link to the JPL schematic. Clay

Hi It's the one that Bruce posted earlier. Actually it showed up as a double post for some odd reason. I opened the whole "hybrid" thing by referring to it. Bob On Feb 12, 2010, at 11:32 AM, life speed wrote: > Message: 3 > Date: Thu, 11 Feb 2010 23:02:30 -0500 > From: Bob Camp <lists@cq.nu> > Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution > (Clay) > > Hi > > I suspect your noise spike can be cured by a series R-C to ground from the junction of Q1 base, Q7 base and all the other stuff. Something is going to have to set a high frequency roll off. With no coils some combo of R and C is going to have to do it. > > You might also try returning all of the upper emitter resistor bypasses to ground rather than B+. Another alternative would be emitter to emitter bypass as shown on the JPL schematic. I'm guessing both would improve isolation in a real world circuit. > > Bob > > Hi Bob, > > Please provide a link to the JPL schematic. > > 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. >