Have a look at http://g4hup.com/DA/DA.htm These are still available!
73, Dave, G4HUP ________________________________ From: Bob Camp <li...@rtty.us> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Wednesday, 23 February, 2011 18:11:16 Subject: Re: [time-nuts] was there ever a "conclusion" on distribution amps ? Hi Since it's in the "no longer available" category, it may not be much of a solution. Not much need to upgrade for most of what you will be running. Another question would be weather you local standard is good to 1x10^-11 at 1 second. If it's not, then that might be the place to put your money. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Wednesday, February 23, 2011 1:07 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] was there ever a "conclusion" on distribution amps ? just to get going until can 'upgrade' to something better. The TAPR was pretty cheap, but quite well though out like most of their stuff. -pete On Wed, Feb 23, 2011 at 10:03 AM, Bob Camp <li...@rtty.us> wrote: > Hi > > That would be the "video amp" alternative. Works fine at some level. I don't > have one so I'm only guessing that it's in the 2x10^-11 at 1 second range. I > would be very surprised if it's not though. > > Is that good enough for the gear you have? I certainly have not seen much > stuff that would be unhappy with a standard at that level. This being Time > Nuts, you do have to ask.... > > One other area that would limit you - if you are trying to multiply directly > up to microwave off of the 10 MHz, then that's a special case as well. > > Bob > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Pete Lancashire > Sent: Wednesday, February 23, 2011 12:52 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] was there ever a "conclusion" on distribution amps > ? > > was thinking along the lines of this (now discontinued) > > http://www.tapr.org/kits_tadd-1.html > > > > On Wed, Feb 23, 2011 at 8:51 AM, Bob Camp <li...@rtty.us> 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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 -- 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. > > > _______________________________________________ > 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. _______________________________________________ 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.