[time-nuts] OCXO shock protection

Tom Knox actast at hotmail.com
Mon May 20 16:20:56 UTC 2013 

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 at febo.com
> From: johncroos at 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-request at febo.com>
> To: time-nuts <time-nuts at febo.com>
> Sent: Sun, May 19, 2013 10:13 pm
> Subject: time-nuts Digest, Vol 106, Issue 94
> 
> 
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> 
> 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 <kc0vsj at yahoo.com>
> To: "time-nuts at febo.com" <time-nuts at febo.com>
> Subject: Re: [time-nuts] Net4501's cheap..
> Message-ID:
> 	<1369015822.8519.YahooMailNeo at 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 <shalimr9 at 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 <bownes at gmail.com>
> To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Cc: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ?
> Message-ID: <5B6C53A6-7B8C-47B2-8EB8-94A67F6261D8 at 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 <paulswedb at 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 <andy at 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 <stanw1le at 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 at 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 at 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 at 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 <sandeenpa at yahoo.com>
> To: "time-nuts at febo.com" <time-nuts at febo.com>
> Subject: [time-nuts] OCXO shock protection
> Message-ID:
> 	<1369016177.26485.YahooMailNeo at 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 <paulswedb at gmail.com>
> To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: Re: [time-nuts] Time Nut Pickens at the MIT Flea ?
> Message-ID:
> 	<CAD2JfAhTg_S+_++jhk2fhMgNz5s0dHeKXOMBOmjKfOC8UaC5Kg at 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 <bownes at 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 <paulswedb at 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 <andy at 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 <stanw1le at 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 at 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 at 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 at 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 at 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 <hmurray at megapathdsl.net>
> To: Perry Sandeen <sandeenpa at yahoo.com>,	Discussion of precise time
> 	and frequency measurement <time-nuts at febo.com>
> Subject: Re: [time-nuts] OCXO shock protection
> Message-ID:
> 	<20130520030335.D7797800071 at ip-64-139-1-69.sjc.megapath.net>
> Content-Type: text/plain; charset=iso-8859-1
> 
> 
> sandeenpa at 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 <fwbray at mminternet.com>
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] OCXO shock protection
> Message-ID: <51999442.90202 at 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.chris at gmail.com>
> To: Perry Sandeen <sandeenpa at yahoo.com>, 	Discussion of precise time
> 	and frequency measurement <time-nuts at febo.com>
> Subject: Re: [time-nuts] OCXO shock protection
> Message-ID:
> 	<CABbxVHseqWuJ=6Nie=BrP77d7v9qubFiFDGxHz_jj1HfK2h3mw at 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 <sandeenpa at 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 at 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 at febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> 
> End of time-nuts Digest, Vol 106, Issue 94
> ******************************************
> 
>  
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