Hi I don't believe most of that stuff is going to need a super standard as far as short term or phase noise is concerned. The only exception might be the 5370B. I haven't looked at it's clock setup / PLL in a while.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Pete Lancashire Sent: Wednesday, February 23, 2011 12:58 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] was there ever a "conclusion" on distribution amps ? Initial destinations are HP 8665A, 5345A, 3325B, 5370B, 5372A, etc. for the critical stuff and for some oldies like a GR 1161A and HP 5110A at 1 and 5 MHz. then at some point I'll want it for projects of my own but first want to get the "back of the benches" first.. -pete On Wed, Feb 23, 2011 at 8:51 AM, Bob Camp <[email protected]> wrote: > Hi > > How good a 10 MHz do you need noise wise? > > If the stuff is common lab gear, there are a bunch of ways to go. If you are > driving dual mixer setups then your choices narrow down a bit. Having stuff > on one bench (and ground) is easier than running cables hundreds of feet. > > Assuming it's normal lab gear on one bench: > > Sixteen port power splitters from a junk pile should have about 12 db of > loss. Run about 100 mw / 20 dbm into it and you will have plenty of signal > to run normal lab gear. An ACMOS hex (or octal) buffer based amp can give > you that sort of power. Having the logic levels also helps get to 1 and 5 > MHz. Not a lot of isolation, not real low noise, plenty good enough for 1 to > 2x10^-11 at one second. > > A few alternatives are also pretty easy. Use a single logic to sine amp per > output and drop the power splitter. Run video amp chips and forget about the > logic conversion. For better performance, run discrete 2N3904(6) based amps > for each channel. A lot depends on what you already have lying around. > > If it's not the garden variety stuff, then indeed you likely will need > something a bit more complex. I'd still consider a simple system to drive > the easy stuff and only go fancy for the one or two things that really need > something that's low noise / high isolation / what ever. > > If you also are trying to do RF work (like HF radio) consider the spray from > what ever you do. I have seen 10 MHz standard setups that put out massive > signals at 30 or 50 MHz. A bit of thought, a solid ground sheet, and some > cheap coils / caps can go a long way. > > Bob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Pete Lancashire > Sent: Wednesday, February 23, 2011 11:18 AM > To: Discussion of precise time and frequency measurement > Subject: [time-nuts] was there ever a "conclusion" on distribution amps ? > > I will soon have my 11 th piece of equipment that I want to feed 10 > MHz (and some oldies 5 and 1). > > What is the current though on making one's own distribution box ? > > -pete > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
