[time-nuts] Re: Tbolt

[Gerhard Hoffmann]

Am 22.07.21 um 16:11 schrieb ew via time-nuts:
> If some one has a bad one how about opening it and take some pictures. 
> Would be very informative. Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â Bert Kehren



I can only offer an opened Morion MV-89A.
The 10 MHz version is really 5 MHz + doubler.
It stopped oscillating with Vtune > 0.6V, so it was a natural candidate
for forensic medicine.

< 
https://www.flickr.com/photos/137684711@N07/49585174873/in/album-72157662535945536/Â Â Â Â  
 >

and some pictures following the RIGHT arrow.


These are the measured data of the crystal itself, in case someone needs
input for simulation of a 5 MHz SC crystal.
Measured with the Crystal utility of the DG8SAQ VNWA; I wonder why my 
R&S ZVB does not have that.

C0 strays a bit, probably the equation system was somewhat ill defined.
The HP4274A RLC bridge says 2.90 pF.



nominal frequency at room temp.

F = 4999868.18548896

Q = 2058123.87937723

L = 5.31149294399851

C = 1.90768447144417E-16

R = 81.074358418583

C0= 2.8136087840004E-12




B-Mode at room temperature / 27°C

F = 5456268.74855202

Q = 2070228.75819907

L = 5.60406600257822

C = 1.51825777903696E-16

R = 92.8026816958027

C0= 2.50200142407676E-12




fundamental at room temp.

F = 1706530.674

Q =12634

L = 2.882184522

C = 3.017798817E-15

R = 2446.1

C0= 3.400172339E-12


---------------------------------------------
The 88 °C were generated by a Steinelt heat gun that was fixed at the 
microscope boom
and an electronic thermometer in the air stream. Not ultra-precision.


Nominal frequency at 87.8°C

F = 4999977.73472294

Q = 2210624.24356611

L = 5.31056260615351 5310652606 nH

C = 1.90793506338953E-16 0.00019079350 pF

R = 75.4698598161708

C0= 2.67067707950378E-12


B-Mode at 88°C

F = 5445966.6930594

Q = 1559143.3579169

L = 4.56636349264629

C = 1.87033681366853E-16

R = 100.216511187362

C0= 3.02668789364201E-12


Fundamental @ 88°c

F = 1706366.18003318

Q = 7829.11559388434

L = 2.67725816365808

C = 3.24941770179082E-15

R = 3666.31393448872

C0= 3.28464263904697E-12


cheers, Gerhard