Re: [time-nuts] Rakon HSO-14

Here's a link to data on an 8607-008. You may recognize the bottom plot from a recent posting. :-) But the ADEV and PN data at the top of the page is from the factory test data. The ADEV doesn't explicitly say so, but I strongly believe it's based on comparison with a "gold standard" 8607.

Re: [time-nuts] Rakon HSO-14

Hi Obviously you need two more 8607’s ….. :) I suspect you are correct and the OCXO is doing better than the close in data suggests. Bob > On Feb 4, 2018, at 8:33 AM, Tom Van Baak wrote: > > FYI: here's an old plot where I evaluated an Oscilloquartz 8607 BVA against a

Re: [time-nuts] Rakon HSO-14

Hi > On Feb 4, 2018, at 7:13 AM, Poul-Henning Kamp wrote: > > > In message <480971424.644410.1517715556...@webmail.xtra.co.nz>, Bruce > Griffiths > writes: > >> It has been used to machine/polish crystal quartz waveplates and >> to machine/polish the surface of

Re: [time-nuts] Rakon HSO-14

FYI: here's an old plot where I evaluated an Oscilloquartz 8607 BVA against a H-maser. It gets down to 8e-14 but is likely a bit better. On this plot, I suspect the short-term numbers were not the BVA oscillator or the TSC 5110A analyzer, but the H-maser. /tvb

Re: [time-nuts] Rakon HSO-14

In message , Bob kb8tq writes: >If you try “normal” machining techniques on a resonator, you are very >likely to create micro cracks in the material. Those are *really* bad for >aging and a few other issues ….. So that brings me to another

Re: [time-nuts] Rakon HSO-14

In message <480971424.644410.1517715556...@webmail.xtra.co.nz>, Bruce Griffiths writes: >It has been used to machine/polish crystal quartz waveplates and >to machine/polish the surface of silicon wafers before uses for >MEMS fabrication. Its even been used to carve channels in silicon

Re: [time-nuts] Rakon HSO-14

There is abrasive entrained in the fluid stream. Operation is in the ductile grinding regime so fluid pressures are around 6 bar or so, way below that used in abrasive water jet cutting. It has been used to machine/polish crystal quartz waveplates and to machine/polish the surface of silicon

Re: [time-nuts] Rakon HSO-14

Hi Anything like a laser that generates heat to do the “work” will twin the quartz. Once you do that, it’s pretty much useless as a resonator. The same issue gets you in trouble trying to wire bond to a resonator. Bob > On Feb 3, 2018, at 9:46 PM, Hal Murray wrote:

Re: [time-nuts] Rakon HSO-14

kb...@n1k.org said: > Unfortunately ( at the rates you must use) the “blast it with a fire hose” > approach is not very fast….. How fast to laser blasters work and/or how much do they damage the crystal? -- These are my opinions. I hate spam.

Re: [time-nuts] Rakon HSO-14

Hi Unfortunately ( at the rates you must use) the “blast it with a fire hose” approach is not very fast….. Bob > On Feb 3, 2018, at 8:15 PM, Bruce Griffiths > wrote: > > Fluid jet polishing perhaps? > > At least on fused quartz and optical glass there is no

Re: [time-nuts] Rakon HSO-14

Fluid jet polishing perhaps? At least on fused quartz and optical glass there is no associated subsurface damage. Bruce > > On 04 February 2018 at 14:05 Bob kb8tq wrote: > > Hi > > If you try “normal” machining techniques on a resonator, you are very > likely

Re: [time-nuts] Rakon HSO-14

Hi If you try “normal” machining techniques on a resonator, you are very likely to create micro cracks in the material. Those are *really* bad for aging and a few other issues ….. Much of the normal production flow of the quartz is designed to keep the processes like sawing far enough away from

Re: [time-nuts] Rakon HSO-14

In message <0f9a9acc-4cdf-780f-e633-616262264...@earthlink.net>, jimlux writes: >> [1] Surprising to me is that modern dentists are highly kitted for >> CNC-ing very hard ceramic materials at high precision. > >But, small "tooth sized" pieces - how big is your crystal. Well, they

Re: [time-nuts] Rakon HSO-14

On 2/3/18 3:31 PM, Poul-Henning Kamp wrote: In message <31183984-ed9d-60e1-6528-76dfde5f3...@rubidium.dyndns.org>, Magnus D anielson writes: The slots and thus the remaining bridges seems to have been a relatively simple stage of the process. Orientation of the blank seems to have

Re: [time-nuts] Rakon HSO-14

Hi Back when the BVA was up for sale, by far the biggest issue was the machining involved in making those slots. They don’t just have to be slots. They have to be very precise. Etching will not do the trick. Neither will most machining processes. Electrode shape changes have been part of

Re: [time-nuts] Rakon HSO-14

In message <31183984-ed9d-60e1-6528-76dfde5f3...@rubidium.dyndns.org>, Magnus D anielson writes: >The slots and thus the remaining bridges seems to have been a relatively >simple stage of the process. Orientation of the blank seems to have been >simple. The shapes for the electrodes

Re: [time-nuts] Rakon HSO-14

Hi, The slots and thus the remaining bridges seems to have been a relatively simple stage of the process. Orientation of the blank seems to have been simple. The shapes for the electrodes seems to have been worse. Cheers, Magnus On 02/03/2018 11:34 PM, Bob kb8tq wrote: > Hi > > The “BVA” part

Re: [time-nuts] Rakon HSO-14

Hi The “BVA” part of the name refers to the slots machined into the crystal blank to manage the mounting stress on the resonator. Both the “plated on the blank” and the “electrodes off blank” versions are legit BVA approaches. Indeed the electrode off the blank version is the more expensive

Re: [time-nuts] Rakon HSO-14

On Fri, 2 Feb 2018 11:02:27 -0800 wrote: > Anyone priced a Rakon HSO-14 option 8. > > It's the Oscilloquartz 8607 option 8 replacement. > > I'm almost afraid to ask! I do not know the HSO-14, but when I asked what the 8607 costs new, I got ~5000 CHF for the "lowest" grade