Several co-workers have researched this subject extensively and have published a number of interesting papers on the subject. The other question is what is the nature of seismic activity in general, and specifically in your area. If I am not mistaken the force vectors can vary greatly depending on the geology. http://tf.nist.gov/timefreq/general/pdf/2103.pdf http://tf.nist.gov/timefreq/general/pdf/2328.pdf Enjoy Thomas Knox
> To: time-nuts@febo.com > From: johncr...@aol.com > Date: Mon, 20 May 2013 06:39:52 -0400 > Subject: Re: [time-nuts] OCXO shock protection > > > > > > Re: [time-nuts] OCXO shock protection > > Water heaters must be bolted to the wall studs. Other wise they go over. > Several hundred pounds of water is a big mass. > > Lived there for 50 years. Generally earthquakes are pretty localized and not > a huge hazard with just a little thought. You do have to buy "earthquake > insurance". Costs me about $ 400 per year for a home I still have there. > > You can suspend the gear on as a pendulum from a single > line. That should provide some isolation and also a DIY seismograph. The > military shock mount racks are designed to > protect a specific load. So may not work. > > john k6iql - in KS. New place different hazards! > > > -----Original Message----- > From: time-nuts-request <time-nuts-requ...@febo.com> > To: time-nuts <time-nuts@febo.com> > Sent: Sun, May 19, 2013 10:13 pm > Subject: time-nuts Digest, Vol 106, Issue 94 > > > Send time-nuts mailing list submissions to > time-nuts@febo.com > > 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 > time-nuts-requ...@febo.com > > You can reach the person managing the list at > time-nuts-ow...@febo.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Re: Net4501's cheap.. (Tom Clifton) > 2. Re: Time Nut Pickens at the MIT Flea ? (Bob Bownes) > 3. OCXO shock protection (Perry Sandeen) > 4. Re: Time Nut Pickens at the MIT Flea ? (paul swed) > 5. Re: OCXO shock protection (Hal Murray) > 6. Re: OCXO shock protection (Frederick Bray) > 7. Re: OCXO shock protection (Chris Albertson) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 19 May 2013 19:10:22 -0700 (PDT) > From: Tom Clifton <kc0...@yahoo.com> > To: "time-nuts@febo.com" <time-nuts@febo.com> > Subject: Re: [time-nuts] Net4501's cheap.. > Message-ID: > <1369015822.8519.yahoomail...@web161602.mail.bf1.yahoo.com> > Content-Type: text/plain; charset=iso-8859-1 > > Seller obviously figured out that somebody feels they are of value and > adjusted > the selling price to see what he can squeeze out of them. ?I'd suggest making > a > $20 offer if you want to try to drive the price back down to what is > reasonable > > > Message: 6 > Date: Sun, 19 May 2013 18:07:51 -0500 > From: Didier Juges <shali...@gmail.com> > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Net4501's cheap... > I snatched one for $20 and they are now $59 or best offer. > > ------------------------------ > > Message: 2 > Date: Sun, 19 May 2013 22:09:06 -0400 > From: Bob Bownes <bow...@gmail.com> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Cc: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ? > Message-ID: <5b6c53a6-7b8c-47b2-8eb8-94a67f626...@gmail.com> > Content-Type: text/plain; charset=us-ascii > > We should plan a Time-Nuts BOF lunch after the next flea. > > Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a > few > 10811s of dubious quality for $50 ea. the dents put me off gambling on one > since > I was given or the afternoon before! ;) > > On May 19, 2013, at 21:50, paul swed <paulsw...@gmail.com> wrote: > > > Hello to the group. > > I did see the leitch video DA's. Was a good price if the DA's were in the > > case. The other thing to watch out for is that Leitch made all types of DAs > > digital also. You want the simple vide monitoring DA, Equalizing DAs are OK > > also delays are a pain. > > > > John it was good to see you and Jim. Great Wx. > > > > As for the pickens not much at all. I picked up to EGG RB oscillators and > > warming one up right now to see if it will work. At $20 each worth a try. > > Other then that parts and the real find a HPIB frame for Tek modules for > > $20. Been looking for one for quite a while. > > But really little time-nuttery stuff. > > > > Stan one day one way or another would be good to run into you. I also did > > not see Paul. (The other one who is also a slight time nut) > > Regards > > Paul > > > > > > On Sun, May 19, 2013 at 6:55 PM, Andy Bardagjy <a...@bardagjy.com> wrote: > > > >> I grabbed a real nice Leitech distribution amplifier - but I took it home > >> and it was empty! > >> > >> I walked back and returned it for a refund, but the seller said he had a > >> whole stack in his office. I was gonna post to the list when I sort it out > >> - it was a real bargin, and he said he might be willing to ship them > >> around. > >> > >> Andy Bardagjy > >> bardagjy.com > >> > >> > >> On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE <stanw...@verizon.net> wrote: > >> > >>> Anyone got any Time Nut quality items at the MIT fleamarket today ? > >>> > >>> Stan, W1LE Cape Cod > >>> ______________________________**_________________ > >>> time-nuts mailing list -- time-nuts@febo.com > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** > >>> mailman/listinfo/time-nuts< > >> 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. > > > ------------------------------ > > Message: 3 > Date: Sun, 19 May 2013 19:16:17 -0700 (PDT) > From: Perry Sandeen <sandee...@yahoo.com> > To: "time-nuts@febo.com" <time-nuts@febo.com> > Subject: [time-nuts] OCXO shock protection > Message-ID: > <1369016177.26485.yahoomail...@web120501.mail.ne1.yahoo.com> > Content-Type: text/plain; charset=utf-8 > > > > All, > ? > We will be moving to southern California in the > near future. > ? > My question if for people who live in that area is > do you need to do additional shock mounting for OCXO?s because of the ongoing, > usually minor, ?earth tremors that take > place? > ? > I will be running two of the Lucent units and two HP > 10811 series which are in my 5370B TIC?s. > ? > The condo is built on a concrete slab and the only > available space will be in the garage. > ? > In the Absolute Audio magazine they have had > reviews on equipment stands that had spiked legs that went in a complimentary > cup on the floor.? The idea was to turn > any vibration into heat with the spiked points. > ? > Comments appreciated. > ? > Regards, > ? > Perrier > > > ________________________________ > > ------------------------------ > > Message: 4 > Date: Sun, 19 May 2013 22:22:59 -0400 > From: paul swed <paulsw...@gmail.com> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ? > Message-ID: > <cad2jfahtg_s+_++jhk2fhmgnz5s0dhekxombomjkfoc8uac...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Good news at least the first EGG RB fired up and after adjusting the > synthesizer is locked very nicely. Letting it bake and figuring out the dip > switches. They were wrong or purposely offset. Hard to say. Lamp voltage is > 12 VDC I suspect thats quite a good number if compared to the old FRS and > FRCs I have down in the 5-6V range. The FRS/C run 12 new. > Can't really find any documentation, but expected that. > Regards > Paul > WB8TSL > > > On Sun, May 19, 2013 at 10:09 PM, Bob Bownes <bow...@gmail.com> wrote: > > > We should plan a Time-Nuts BOF lunch after the next flea. > > > > Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a > > few 10811s of dubious quality for $50 ea. the dents put me off gambling on > > one since I was given or the afternoon before! ;) > > > > On May 19, 2013, at 21:50, paul swed <paulsw...@gmail.com> wrote: > > > > > Hello to the group. > > > I did see the leitch video DA's. Was a good price if the DA's were in the > > > case. The other thing to watch out for is that Leitch made all types of > > DAs > > > digital also. You want the simple vide monitoring DA, Equalizing DAs are > > OK > > > also delays are a pain. > > > > > > John it was good to see you and Jim. Great Wx. > > > > > > As for the pickens not much at all. I picked up to EGG RB oscillators and > > > warming one up right now to see if it will work. At $20 each worth a try. > > > Other then that parts and the real find a HPIB frame for Tek modules for > > > $20. Been looking for one for quite a while. > > > But really little time-nuttery stuff. > > > > > > Stan one day one way or another would be good to run into you. I also did > > > not see Paul. (The other one who is also a slight time nut) > > > Regards > > > Paul > > > > > > > > > On Sun, May 19, 2013 at 6:55 PM, Andy Bardagjy <a...@bardagjy.com> > > wrote: > > > > > >> I grabbed a real nice Leitech distribution amplifier - but I took it > > home > > >> and it was empty! > > >> > > >> I walked back and returned it for a refund, but the seller said he had a > > >> whole stack in his office. I was gonna post to the list when I sort it > > out > > >> - it was a real bargin, and he said he might be willing to ship them > > >> around. > > >> > > >> Andy Bardagjy > > >> bardagjy.com > > >> > > >> > > >> On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE <stanw...@verizon.net> > > wrote: > > >> > > >>> Anyone got any Time Nut quality items at the MIT fleamarket today ? > > >>> > > >>> Stan, W1LE Cape Cod > > >>> ______________________________**_________________ > > >>> time-nuts mailing list -- time-nuts@febo.com > > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** > > >>> mailman/listinfo/time-nuts< > > >> 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. > > > > > ------------------------------ > > Message: 5 > Date: Sun, 19 May 2013 20:03:35 -0700 > From: Hal Murray <hmur...@megapathdsl.net> > To: Perry Sandeen <sandee...@yahoo.com>, Discussion of precise time > and frequency measurement <time-nuts@febo.com> > Subject: Re: [time-nuts] OCXO shock protection > Message-ID: > <20130520030335.d7797800...@ip-64-139-1-69.sjc.megapath.net> > Content-Type: text/plain; charset=iso-8859-1 > > > sandee...@yahoo.com said: > > My question if for people who live in that area is do you need to do > > additional shock mounting for OCXO???s because of the ongoing, usually > > minor, > > ?earth tremors that take place? > > I wouldn't worry about it. If you have gear you are concerned about, a bit > of foam between the gear and shelf might help. > > What you do need to pay attention to is that stuff doesn't fall over. You > bolt things like bookcases to the wall. > > The USGS and various local government organizations put together a good > booklet: > Putting Down Roots in Earthquake Country > http://earthquake.usgs.gov/prepare/ > > > > > -- > These are my opinions. I hate spam. > > > > > > ------------------------------ > > Message: 6 > Date: Sun, 19 May 2013 20:10:58 -0700 > From: Frederick Bray <fwb...@mminternet.com> > To: time-nuts@febo.com > Subject: Re: [time-nuts] OCXO shock protection > Message-ID: <51999442.90...@mminternet.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > That is an interesting question. I am in the greater LA area and have > several pieces of test gear with OCXO's. I have never taken any > precautions other than making sure that the gear can't fall off the > shelf or bench. Then again, I may not be doing things to time-nuts > standards. > > There are a couple of fairly simple shock mount options that I can think > of if you want to pursue this. One is to pick up a couple of military > surplus Hardigg cases that have the 19 inch shock mount racks in them. > You could mount the gear in the case or remove the rack and mount it > elsewhere. If you just want to do shock mounting for a a single piece > of gear, you might take a look at surplussales.com as they have a number > of shock mounts. > > As one other person mentioned, the big thing is to secure shelves and > racks to the wall. If you have ever seen any of the earthquake > simulations where they put full-size room models on shake tables, you > will notice that one of the issues is that the walls will slap against > book shelves, knocking them over. > > Fred > > > On 5/19/2013 7:16 PM, Perry Sandeen wrote: > > > > All, > > > > We will be moving to southern California in the > > near future. > > > > My question if for people who live in that area is > > do you need to do additional shock mounting for OCXO?s because of the > > ongoing, > > usually minor, earth tremors that take > > place? > > > > > > ------------------------------ > > Message: 7 > Date: Sun, 19 May 2013 20:12:43 -0700 > From: Chris Albertson <albertson.ch...@gmail.com> > To: Perry Sandeen <sandee...@yahoo.com>, Discussion of precise time > and frequency measurement <time-nuts@febo.com> > Subject: Re: [time-nuts] OCXO shock protection > Message-ID: > <CABbxVHseqWuJ=6Nie=brp77d7v9qubfifdgxhz_jj1hfk2h...@mail.gmail.com> > Content-Type: text/plain; charset=windows-1252 > > Even in an active fault area the unit will see more mechanical vibration > comming fomr the building cause by walking around and the wind then by > Earthquakes. OK, every few years there might be a few seconds of ground > movement. But most of the constant stuff is very local, within the > building. > > > On Sun, May 19, 2013 at 7:16 PM, Perry Sandeen <sandee...@yahoo.com> wrote: > > > > > > > All, > > > > We will be moving to southern California in the > > near future. > > > > My question if for people who live in that area is > > do you need to do additional shock mounting for OCXO?s because of the > > ongoing, > > usually minor, earth tremors that take > > place? > > > > I will be running two of the Lucent units and two HP > > 10811 series which are in my 5370B TIC?s. > > > > The condo is built on a concrete slab and the only > > available space will be in the garage. > > > > In the Absolute Audio magazine they have had > > reviews on equipment stands that had spiked legs that went in a > > complimentary > > cup on the floor. The idea was to turn > > any vibration into heat with the spiked points. > > > > Comments appreciated. > > > > Regards, > > > > Perrier > > > > > > ________________________________ > > _______________________________________________ > > 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. > > > > > -- > > Chris Albertson > Redondo Beach, California > > > ------------------------------ > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 106, Issue 94 > ****************************************** > > > _______________________________________________ > 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.
