Thx for the feedback, Stan. I'll add a "last update" date and time at the top. I'll only use eBay for the stuff that you guys don't want.
Dick Moore On Apr 26, 2010, at 11:12 AM, [email protected] wrote: > Send time-nuts mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Re: Closing the lab -- gear for sale (Stan, W1LE) > 2. Which voltage regulator chips offer good performance...? > (Michael Baker) > 3. Re: Closing the lab -- gear for sale (J. Forster) > 4. Re: Thunderbolt Power Supply Question (Ed Palmer) > 5. Thunderbolt Power Supply Question (Arthur Dent) > 6. Re: Which voltage regulator chips offer good performance...? > (Bob Camp) > 7. Re: Thunderbolt Power Supply Question (Bob Camp) > 8. Re: Thunderbolt Power Supply Question (Ed Palmer) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 26 Apr 2010 09:45:21 -0400 > From: "Stan, W1LE" <[email protected]> > Subject: Re: [time-nuts] Closing the lab -- gear for sale > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hello Dick, > > Your bidding system is workable. > > I like the web page with the listing and highest bid. > > Please time/date stamp the highest bid, so we know the dynamic. > Please advise when the bidding for each item is to close. > > Please send a reminder, with the web site, for a "every 2 day" update. > > I like this better than Ebay.. NO f***ing snipers are allowed. !!! > > I like your philosophy of getting the stuff into "hands" that will > appreciate and use it. > > Whenever I do a ham estate sale, My #1 objective is to get someone who > is interested in it and will move it off the property. > Many ham radio estates end up in the land fill. > > Stan, W1LE Cape Cod FN41sr > > > > > On 4/26/2010 12:37 AM, Dick Moore wrote: >> Dear time-nuts: >> I'm shutting down my shop-lab and want to sell my equipment. I've got some >> interesting stuff you can see at: >> www.moorepage.net/Testequip.html >> >> As the web page notes, I'll take bids and update them, and when interest >> runs out on something, high bidder gets it. >> >> Thanks for all your past help; good luck... >> >> Dick Moore >> _______________________________________________ >> 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. >> >> > > > > > ------------------------------ > > Message: 2 > Date: Mon, 26 Apr 2010 11:01:40 -0400 > From: Michael Baker <[email protected]> > Subject: [time-nuts] Which voltage regulator chips offer good > performance...? > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hello, Time-Nutters-- > > Bob Camp said: > >> snip >> ...stability is not the only issue. >> Crud on the power supply is an issue as well. >> Some of the ultra low drop out regulators >> are not real good crud blockers. > ----------------------------------------------- > > So... This would seem to bring up the question > of which 3-terminal regulators ARE good (if not > "good" then which are the "best"?) providing both > stability -AND- clean, crud free output? > > How about old standby regulators such as > the 723? Problem there is that the stand-alone > chip is only good for really low current. > > For years I have been using general purpose > 3-terminal regulators sometimes with carefully > selected low impedance capacitance on the output. > > In some cases I have found that a high-gain > transistor in the output configured as a > "capacitance multiplier" serves to handle > current load spikes but is only a nominal help > in cleaning up crud on the output. > > Comments? Suggestions? > > Mike Baker > ------------------------------------- > > > > ------------------------------ > > Message: 3 > Date: Mon, 26 Apr 2010 08:41:11 -0700 (PDT) > From: "J. Forster" <[email protected]> > Subject: Re: [time-nuts] Closing the lab -- gear for sale > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain;charset=iso-8859-1 > > He should also post the notice to: > > [email protected] > > -John > > =================== > > >> Hello Dick, >> >> Your bidding system is workable. >> >> I like the web page with the listing and highest bid. >> >> Please time/date stamp the highest bid, so we know the dynamic. >> Please advise when the bidding for each item is to close. >> >> Please send a reminder, with the web site, for a "every 2 day" update. >> >> I like this better than Ebay.. NO f***ing snipers are allowed. !!! >> >> I like your philosophy of getting the stuff into "hands" that will >> appreciate and use it. >> >> Whenever I do a ham estate sale, My #1 objective is to get someone who >> is interested in it and will move it off the property. >> Many ham radio estates end up in the land fill. >> >> Stan, W1LE Cape Cod FN41sr >> >> >> >> >> On 4/26/2010 12:37 AM, Dick Moore wrote: >>> Dear time-nuts: >>> I'm shutting down my shop-lab and want to sell my equipment. I've got >>> some interesting stuff you can see at: >>> www.moorepage.net/Testequip.html >>> >>> As the web page notes, I'll take bids and update them, and when interest >>> runs out on something, high bidder gets it. >>> >>> Thanks for all your past help; good luck... >>> >>> Dick Moore >>> _______________________________________________ >>> 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. >> >> > > > > > > ------------------------------ > > Message: 4 > Date: Mon, 26 Apr 2010 09:49:54 -0600 > From: Ed Palmer <[email protected]> > Subject: Re: [time-nuts] Thunderbolt Power Supply Question > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi Paul, > > Yes, I've read that page a couple of times, but it doesn't say whether > the Ault, Meanwell, or Acopian power supplies have a 'regulated' or a > 'close enough' +12 supply. I think that the two variable power supplies > would be well regulated. I can pretty well guarantee that the ATX power > supply has a 'close enough' 12V supply. But the two variable supplies > are most likely linear while the others are switchers. This muddies the > question of 'regulated' vs. 'close enough' with the idea of 'switching > supply' vs. 'linear supply'. > > Ed > > [email protected] wrote: >> On 26/04/2010 09:02, Ed Palmer wrote: >> >>> In the Thunderbolt the +12 runs the oscillator. Won't an unregulated, >>> but relatively steady, +12 supply degrade the performance of the >>> oscillator or does the Tbolt have a built-in regulator to deal with >>> this? >> >> There is some interesting reading on this here: >> >> http://www.leapsecond.com/pages/tbolt/noise.htm >> >> HTH >> > > > > ------------------------------ > > Message: 5 > Date: Mon, 26 Apr 2010 09:36:29 -0700 (PDT) > From: Arthur Dent <[email protected]> > Subject: [time-nuts] Thunderbolt Power Supply Question > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=iso-8859-1 > > The +12VDC supply (internal to the sealed oscillator) supplies both the oven > and the oscillator circuits. I think you'll find that internally this +12VDC > goes to the heater circuit as well as through a regulator to the oscillator > which is running on something like +7VDC. This is speculation at this point > but a number of similar type oscillators I've checked are set up this way and > even have a temperature compensated regulated reference voltage out of about > +7VDC to feed a pot or EFC circuit. For instance the HP 10811 has an internal > +5.7VDC regulated supply for the oscillator circuit > > One crude way to check is to take a removed 10Mhz oscillator Trimble > oscillator and power it from a bench supply at +12 and let it stabilize. Then > reduce the supply voltage slowly and see where the output level and/or > frequency start to change. If you see no change until you've reduced the > voltage a few volts then the oscillator has an > internal regulator for the oscillator circuit.? ? > > > > > > ------------------------------ > > Message: 6 > Date: Mon, 26 Apr 2010 12:51:34 -0400 > From: "Bob Camp" <[email protected]> > Subject: Re: [time-nuts] Which voltage regulator chips offer good > performance...? > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Hi > > Two examples: > > Linear LT1764 ($4 to $8 depending on qty): > > Low drop out, low self generated noise, lots of power, lots of current. > Needs help past ~ 8 KHz for crud rejection. > > Linear LT1963 ($3 to $5 depending on qty): > > Better crud rejection, higher dropout, lower power, lower current. Needs > help past ~ 100 KHz. > > Both are adjustable parts. You can tailor them to match the supply you have. > > My preference is the first part with a nice coil (or better two) in front of > it. There are a lot of parts designed for switchers that will do a fine job. > Since the regulator needs at least 10 uF in front of it, the coil(s) can be > in <= 2 mHy and do fine. I get my coils on the e place so I can't recommend > a specific part. You can also do just fine ripping them out of dead > switching supplies. > > One thing you could do if cost is no object - cascade several of the parts > with a bit under a volt across each one. +15 volts to +12 volts with three > stages of isolation. Provided ground loops don't get you, there won't be > much line related stuff at the output of that cascade. > > Bob > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Michael Baker > Sent: Monday, April 26, 2010 11:02 AM > To: [email protected] > Subject: [time-nuts] Which voltage regulator chips offer good > performance...? > > Hello, Time-Nutters-- > > Bob Camp said: > >> snip >> ...stability is not the only issue. >> Crud on the power supply is an issue as well. >> Some of the ultra low drop out regulators >> are not real good crud blockers. > ----------------------------------------------- > > So... This would seem to bring up the question > of which 3-terminal regulators ARE good (if not > "good" then which are the "best"?) providing both > stability -AND- clean, crud free output? > > How about old standby regulators such as > the 723? Problem there is that the stand-alone > chip is only good for really low current. > > For years I have been using general purpose > 3-terminal regulators sometimes with carefully > selected low impedance capacitance on the output. > > In some cases I have found that a high-gain > transistor in the output configured as a > "capacitance multiplier" serves to handle > current load spikes but is only a nominal help > in cleaning up crud on the output. > > Comments? Suggestions? > > Mike Baker > ------------------------------------- > > _______________________________________________ > 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. > > > > > > > ------------------------------ > > Message: 7 > Date: Mon, 26 Apr 2010 13:00:09 -0400 > From: "Bob Camp" <[email protected]> > Subject: Re: [time-nuts] Thunderbolt Power Supply Question > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi > > I'd say those are all pretty safe guesses with any modern OCXO. The drop out > on the internal regulator is likely to be well below anything we would put > on the +12 supply. > > The Trimble spec on the TBolt shows a +/- 10% tolerance on the +12V supply. >> From that I'd assume you could run the unit pretty much forever at 10.800 > volts on the input. > > Bob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Arthur Dent > Sent: Monday, April 26, 2010 12:36 PM > To: [email protected] > Subject: [time-nuts] Thunderbolt Power Supply Question > > The +12VDC supply (internal to the sealed oscillator) supplies both the oven > and the oscillator circuits. I think you'll find that internally this +12VDC > goes to the heater circuit as well as through a regulator to the oscillator > which is running on something like +7VDC. This is speculation at this point > but a number of similar type oscillators I've checked are set up this way > and even have a temperature compensated regulated reference voltage out of > about +7VDC to feed a pot or EFC circuit. For instance the HP 10811 has an > internal +5.7VDC regulated supply for the oscillator circuit > > One crude way to check is to take a removed 10Mhz oscillator Trimble > oscillator and power it from a bench supply at +12 and let it stabilize. > Then reduce the supply voltage slowly and see where the output level and/or > frequency start to change. If you see no change until you've reduced the > voltage a few volts then the oscillator has an > internal regulator for the oscillator circuit.? ? > > > > > _______________________________________________ > 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. > > > > > > > ------------------------------ > > Message: 8 > Date: Mon, 26 Apr 2010 12:11:59 -0600 > From: Ed Palmer <[email protected]> > Subject: Re: [time-nuts] Thunderbolt Power Supply Question > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi Bob, > > Where did you find that 10% spec? I looked in the Tbolt book and the > data sheet but didn't see it. > > Ed > > Bob Camp wrote: >> Hi >> >> I'd say those are all pretty safe guesses with any modern OCXO. The drop out >> on the internal regulator is likely to be well below anything we would put >> on the +12 supply. >> >> The Trimble spec on the TBolt shows a +/- 10% tolerance on the +12V supply. >> From that I'd assume you could run the unit pretty much forever at 10.800 >> volts on the input. >> >> Bob >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Arthur Dent >> Sent: Monday, April 26, 2010 12:36 PM >> To: [email protected] >> Subject: [time-nuts] Thunderbolt Power Supply Question >> >> The +12VDC supply (internal to the sealed oscillator) supplies both the oven >> and the oscillator circuits. I think you'll find that internally this +12VDC >> goes to the heater circuit as well as through a regulator to the oscillator >> which is running on something like +7VDC. This is speculation at this point >> but a number of similar type oscillators I've checked are set up this way >> and even have a temperature compensated regulated reference voltage out of >> about +7VDC to feed a pot or EFC circuit. For instance the HP 10811 has an >> internal +5.7VDC regulated supply for the oscillator circuit >> >> One crude way to check is to take a removed 10Mhz oscillator Trimble >> oscillator and power it from a bench supply at +12 and let it stabilize. >> Then reduce the supply voltage slowly and see where the output level and/or >> frequency start to change. If you see no change until you've reduced the >> voltage a few volts then the oscillator has an >> internal regulator for the oscillator circuit. >> >> >> >> >> _______________________________________________ >> 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] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 69, Issue 63 > ***************************************** _______________________________________________ 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.
