Don
lets see how much interest and which counter and in the 2 channel it is 3
PIC's and 1 G/A and the 4 channel 5 PIC's and 2 G/A. Easy to solder Juerg
and I are 70+ so soldering is a key consideration
Bert Kehren.
In a message dated 11/19/2012 2:48:39 P.M. Eastern Standard Time,
Allow me to put all this in perspective. Three years ago having just
joined time-nuts I started to be interested in Dual Mixers. Having CS and Rb
my
main interest was and still is low noise signal generators and I have all
the HP equipment for those measurements. Did my first Shera Rb
I have three 5071 10811's all have below 1 E-12 AV from 1 to 100 seconds.
Bert Kehren
In a message dated 11/5/2012 7:07:52 P.M. Eastern Standard Time,
rich...@karlquist.com writes:
Bob Camp wrote:
Hi
If you have one of the 10811's out of a Z3801, then it's EFC range is ~
10X
a
Does any one have the schematic of a FTS 1200 OCXO ?
Thanks Bert Kehren Miami
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Tom
I have two questions what should the range, resolution and stability of
the delay generator be and how much do you think a digital loop driven by a
Tbolt would degrade short and medium precision. What is your definition of
short and medium?
Bert Kehren
In a message dated 10/22/2012
Tom
A good place to start is with a manual of the Austron 2055 delay if there
is real interest. Does any one have it in PDF form?
As to the disciplining a Rb or specifically a HP5065A, the filter part is
the challenge. Having worked on it for the last ten years always using
Brooks loop and
Magnus
Are you changing or did you change and if you are how much time do you
have.
Bert
In a message dated 10/22/2012 6:24:06 P.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Bert,
On 10/22/2012 04:46 PM, ewkeh...@aol.com wrote:
Tom
A good place to start is with a
John
I agree with your observations. Before my time nuts time I did make the
mistake of getting rid of my 5065A since I did have a Shera disciplined FRK
and had gotten hold of quite a few HP5061A's and FTS 4000's. Big mistake.
Gave no attention to A/V. Phase noise yes but I went about it by
I did have an Austron, looked identical on the inside.
Bert Kehren
In a message dated 10/14/2012 4:51:51 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
The DOD bought a *lot* of 10811 equivalents as replacement parts for
various repair needs. I suspect everybody in the business
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low have you seen, I have the opportunity
to test 40+ units and hope to find a few even better ones. Any guidance will
be appreciated.
My best reference is 3 E-13 so any thing as
Doc
The units I mentioned have been done by Corby, but I let units run two
weeks before I do any test. In the future when I do the 40+ two a week running
parallel and the best rerun after 4 week soak.
Bert
In a message dated 9/30/2012 7:55:43 P.M. Eastern Daylight Time,
Not being a time nut but a frequency nut I lack some of the time test
equipment, but my partner on our joint development work makes up for it. So he
among other things recently looked at the 1 pps output of the Tbolt against
a Cesium. Using a HP 5352A with 500 samples over 50% are within +-
For a GPS receiver that is in my book acceptable but then I am not a
time-nut. I use that signal to discipline Rb's. Works for me.
Bert Kehren
In a message dated 9/8/2012 12:47:52 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
If you stretch out to 10,000 samples and watch over a
Sorry my mistake 5372A I will send you the data direct
Bert Kehren
In a message dated 9/8/2012 6:15:59 P.M. Eastern Daylight Time,
azelio.bori...@screen.it writes:
The HP5352A has a 2nS single shot resolution: how can you have 300pS or
1nS
measures?
On Sat, Sep 8, 2012 at 9:08 PM,
If 5 V will not do it use a OPA 227 with a gain of 2. That is what I use as
my test rig.
Bert Kehren
In a message dated 8/27/2012 10:54:02 P.M. Eastern Daylight Time,
mspencer12...@yahoo.ca writes:
Thanks.. That seems like a good next step.
(Just to add to this, all three of the units
Thank you. Will look for it here under thermal pad.
Bert
In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time,
azelio.bori...@screen.it writes:
Here in Europe Farnell has the 3M thermal pad in sheets (105x150mm)...
On Mon, Aug 27, 2012 at 12:48 PM, ew ewkeh...@aol.com wrote:
There are components and traces.
Bert
In a message dated 8/27/2012 10:10:45 A.M. Eastern Daylight Time,
jster...@att.net writes:
Are these thermal pads temp conductive or insulative? If you want heat
dissipation why not use the readily available thermal grease used for
semiconductor
without any EFC I would expect it to be 1 Hz low. If less than 5 Volt will
get it on frequency I would use a 78L12 from your main supply followed by a
TI REF02. Worked for me.
Bert Kehren
In a message dated 8/27/2012 10:13:35 P.M. Eastern Daylight Time,
mspencer12...@yahoo.ca writes:
Having played with several solutions I found the best is a 12 V 1 A
switcher with the output voltage increased to 15 V, check the capacitors and if
necessary replace with 25 V. I laid out a PC board that has a TC7662A
inverter followed by a 79L12. Also on the board is a 7812 followed by a
Having played with most combinations I could think of including the 1764
there is a lot to be said about the stability of the 7812 and mounting every
thing on one plate since power dissipation of the OCXO decreases with
increase in ambient temperature and current fluctuation is minimal since
Edgardo
If you need a Shera board and parts I still have some extras. Contact me
off list.
Bert
In a message dated 8/24/2012 4:05:08 P.M. Eastern Daylight Time,
xe1...@amsat.org writes:
Dear Bert,
Thank you for your always expert advise. I am receiving an HP 105B next
week and for
You can discipline a HP 5065A easily using a Shera with the Tbolt 1 PPS
and a LTC 1655 DAC in stead of an AD 1861.
Bert Kehren.
In a message dated 8/22/2012 8:23:06 A.M. Eastern Daylight Time,
jlt...@att.net writes:
Edgardo,
Congrats on getting the 5065A up and operational. Make sure
In the commercial world a PRS10 is most likely the best but for time nuts
even at the surplus price in my opinion it is all hype and a waste of
money. Have you looked closely at the specification and the design. Frequency
accuracy can not be better than 1 E-12 since the OCXO is driven
Bjoern
Thank you for the link I am able to change the frequency 4 Hz from - 2Hz (
0V) to + 2 Hz (-12.2V) using pin 2. Reading the info that you got me
probably explains the slot next to the connector, but I experience a much wider
tuning range on pin 2 and John is right any positive
Ed
I did not see any current, but that is also due to the fact that there is
most likely at least 10 K between pin 2 and the varactor. Most likely if it
was biased for instance + 12 Volt, there would also be a resistor before
the diode. I suspect John is right that with my + voltage the
Ed
I think so too. I hope if it is a shorted capacitor it stays but looking at
for instance at the bias of a 10811. There would be no capacitor right at
the diode. I have the tuning network for a 1130 and it shows a 20 K to an
internal +12 V
Bert
In a message dated 8/10/2012 2:01:22 P.M.
I have a FTS 1200 that is off by about 2 Hz. Have decided to take a
closer look. Does any one have technical Information I should study before I
open it up.
Thanks
Bert Kehren
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Thank you will try
Bert
In a message dated 8/9/2012 5:54:46 P.M. Eastern Daylight Time,
mspencer12...@yahoo.ca writes:
Depending on how long your FTS 1200 has been running you may want to wait
for a few weeks or so. A new to me FTS 1050 had a similar problem that
went away after a few
Bjoern
No not able to tune it to 5 MHz.
Bert
In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time,
b...@lysator.liu.se writes:
Hi Bert,
I have a FTS 1200 that is off by about 2 Hz. Have decided to take a
closer look. Does any one have technical Information I should study
The unit starts high and over 20 minutes comes down to 4.975 with 0 V
on the EFC. Any voltage on pin 2 and it quits oscillating.
Bert
In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
As the unit warms up, you should be able to tell weaner it
Bjoern
No EFC. The moment I even put a small Voltage like 0.9 V through a 33 K
resistor on pin 2 it quits oscillating.
Bert
In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time,
b...@lysator.liu.se writes:
Hi Bert,
So the EFC does not work at all? (or did I miss something
Bill
Grounded pin, works and stays on frequency.
Bert
In a message dated 8/9/2012 8:29:08 P.M. Eastern Daylight Time,
wb6...@cox.net writes:
Hi Bert,
My guess would be a bad (shorted maybe?) Varicap. Does it go out of
oscillation
if you just ground the efc pin ?
BillWB6BNQ
John
Oven did reduce in current and I can not imagine that it would be that
close with an overheated oven. At 0 V it is within .5 Hz of what they normally
are. Ground has no effect but even 0.8 V on pin 2 stops oscillation
Once it stops it takes about 10 seconds to continue oscillation, about
John,
that did the trick I can tune it with a negative voltage, minus 13 gives
me plus 2 Hz but this unit came out of a FTS 5000 and it had a positive
tuning voltage.
Bert
In a message dated 8/9/2012 9:13:29 P.M. Eastern Daylight Time,
jmi...@pop.net writes:
John
Oven did reduce in
John
Thanks again I am calling it a night. Will let it soak over night and
continue tests in the morning. Does any one have the oscillator circuit. With
the connector on the bottom left to the right id something that looks like
an adjustment screw,flat round flush with the surface and a
The cheapest is a 74HC90 with a 74HC14 one as input the other five as
output. Can also be LS.
The best with all bells and whistles is a Altera MAX 3000 gate array with
two selectable outputs paralleling four outputs with resisters,
transformer input with Wenzeland sync input. No SMD's
In a message dated 6/11/2012 11:52:00 A.M. Eastern Daylight Time,
albertson.ch...@gmail.com writes:
On Mon, Jun 11, 2012 at 3:28 AM, Bob Camp li...@rtty.us wrote:
Hi
I was concerned about the appearance before I did the first one. After
putting several up, they all look pretty good.
I know I repeat my self. I have done so far four sewer vents using a 4 way
PVC splitter, sanding the side stubs down and glue a white GPS antenna
flush on the top. 4 way so air comes in or out on the sidesRun the coax down
the inside of the pipe, fish it out at the best location, seal the
Most Rb's can be improved when it comes to phase noise even a FRK-H, some
by replacing the internal oscillators, some by adding an external analog
loop. How ever multiplying to 10 GHz and you have to contend with the 60 db
deterioration. One way around is higher frequency XTAL or SAW
I would not use a Thunderbolt. It dithers the OCXO frequency to correct
the second pulse and that frequency change will be multiplied particularly in
U wave applications.. I have never checked, but if LH has a hold function
you could use it, but in that case I would also bring out the
I also located a couple of units in my inventory. But U 7 is not critical,
it was at the time an elegant way to perform two functions. Now that it is
not readily available the fix is to use a 6 MHz resonator between pin 9 and
10 on the PIC. 6 MHz is not critical for the over all function
It is the Xtal with 1/4
Bert Kehren
In a message dated 5/13/2012 10:52:47 A.M. Eastern Daylight Time,
albertson.ch...@gmail.com writes:
Maybe you can remind us what U7 is. Someplace I have a schematic but
not handy right now.
On Sun, May 13, 2012 at 5:24 AM, Kevin Staley
Jerry
If you want to contact me off list I will share with you our low cost M12+
saw tooth correction circuit.
Bert
In a message dated 5/9/2012 5:28:16 A.M. Eastern Daylight Time,
jmulc...@cox.net writes:
OK, so before I commit to my Sawtooth correction design, I had a thought
about
Time nuts has turned in to a chat room to people that have diarrhea of
their fingers. The result is that many of us converse off list and do not
contribute to meaningful dialog.
Are there not rules and if yes, should they not be respected and adhered
to?
Bert Kehren
Roberto
you and I have already dialog off list that I value and we will continue.
Some legitimate questions get drowned out by off subject postings but in my
opinion there is room for techno elitism on subjects that are time and
frequency related I have learned a lot, and for
Doc contact me off list
Bert Kehren
In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time,
docdai...@gmail.com writes:
Does anyone have any knowledge of a simple (just soldering a few
connections and maybe programming a hz/volt rate) PCB for synchronizing a
precision
OCXO to
Tried, no interest, some one has offered to in the future do a gate array
version, you may want to wait for that I am in the mean time using am analog
loop for less than 100 seconds between Rb and OCXO and a very modified
Shera for GPS/Rb. Works for me.
Contact me off list and we can talk.
I am patiently waiting for the code to drive the DAC.
Bert Kehren
In a message dated 5/7/2012 12:54:54 P.M. Eastern Daylight Time,
att...@kinali.ch writes:
On Mon, 7 May 2012 10:30:56 -0500
Bill Dailey docdai...@gmail.com wrote:
Does anyone have any knowledge of a simple (just soldering
is not impression it is personal experience ebay does not care. Specially
when it comes to volume sellers, a seller that time nuts use promised to
pay shipping to return crap, gave me a choice give 5 star rating or no
refund. Contacted ebay with the evidence, they did nothing and I did not
The Altera Max 3000A as I mentioned before will do all TTL devices, it has
an extensive library easy to use and very cheap. All That at 200 MHz. I
became a believer and others I introduced to it love it to. In an hour from
downloading the free software you can have your first design. If I
Contact me off list and I will be glad to work with you. Test board etc.
Bert Kehren
In a message dated 4/27/2012 2:36:45 P.M. Eastern Daylight Time,
davidwh...@gmail.com writes:
I have been looking at CPLD and FPGA designs for aggregating the logic
required but keep running up against
correct
Bert Kehren
In a message dated 4/27/2012 6:58:32 P.M. Eastern Daylight Time,
azelio.bori...@screen.it writes:
FPGA with internal flash memory to boot from, yes, but I think that small
CPLD haven't to boot anything: they should have the interconnection array
associated with the
Has any one considered asking Richard. As far as logic is concerned a 200
MHz Altera MAX 3000A makes a perfect substitute at a cost of $ 2.50 that
includes a very solderable socket. Works
Bert Kehren
In a message dated 4/25/2012 3:16:51 P.M. Eastern Daylight Time,
It is a circuit that they for instance use in the 2110 where they take the
reference input in case of 10 MHz divide by 2 and also divide the 5 MHz
down to 500 Hz use an exor and out comes 5.000500 MHz filtered and divided by
5. The result is 1.000100 MHz which is mixed with the unknown
I have and use a Tracor 527E how ever the Austron circuit including counter
is a PCB board 2.2 X 2.5 inches and I have not seen a Tracor for $ 50. I
think I paid $ 800 fifteen years ago.
Bert Kehren
In a message dated 4/20/2012 11:37:16 A.M. Eastern Daylight Time,
e...@telight.com
Ed
at one time I used two 9 GHz multiplier chains out of FTS 4000's mixed
them, if you are interested contact me off list I may still have them. Have
thrown out many things because I am downsizing in preparation for a move.
Bert
In a message dated 4/20/2012 11:37:16 A.M. Eastern Daylight
Wolfgang
It would help if you would let us know what equipment other than a scope
you have. Also what resolution you would want to achieve. One time set up or
want to use repeatedly.
Bert Kehren
In a message dated 4/19/2012 4:53:40 P.M. Eastern Daylight Time,
saidj...@aol.com writes:
Wolfgang
I have quite a collection of equipment and have build Dual Mixer, PICTIC
and what I think is best for you a circuit I call the Austron circuit. For
less than $ 50 you can have a standalone system that gives you a RS 232
output with 1 E 12 resolution in 1 second, the PIC has 0.1, 1,
True if you do not include the cost of the burned down house which is a
possibility.
Bert Kehren
In a message dated 4/12/2012 9:59:08 A.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 4/12/12 6:22 AM, Michael Baker wrote:
Time-nutters--
Around here (N. Central Flori-DUH) it
Chris
do you or any one else have a micro controller and code for such an 8 pin
solution? The rest I would know how to do.
Bert Kehren
In a message dated 4/7/2012 12:12:40 P.M. Eastern Daylight Time,
albertson.ch...@gmail.com writes:
The simplest way to do this is to use a standard
Ed
Thank you for your interest. I have checked many of the circuits which is
made easy in some cases because it is a duplication of the M100 in some
areas and the FRS in others. I have both for comparison. Do to the very high
densely packaging is it not easy to probe since some of the
Magnus
RC oscillator and demodulator along with the 1 uF and integrator are all
standard Efratom, use different pins and the oscillator is 2.72 KHz the
problem is the signal path from the detector to the demodulator. That is what
I
am looking for. Will get there. will take time.
Thanks
In the past I have asked if some one has any info of the Efratom M3100. I
have carefully dissected the unit and checked functionality. It sweeps but
does not lock. Lamp signal is strong 60 MHz and 5.xx all work properly and
can be seen on a spectrum analyzer The problem is in the loop and
Paul thank you.
I tried google and only got links to advertise other parts. Makes sense,
unit has a summary bit output, probably checks 4 levels and gives a lock
output. Different from M100 and other Efratom products. Still hunting for the
85 Hz, 127 Hz on the M100 is 5V pp into the phase
Thanks Mike
In a message dated 4/1/2012 4:33:51 P.M. Eastern Daylight Time,
mbla...@satx.rr.com writes:
The JM38510/11201BCA crosses to a LM139 which is the Mil-Spec version of
the LM339.
Mike
On 4/1/2012 2:39 PM, ewkeh...@aol.com wrote:
Paul thank you.
I tried google and only
Magnus
I am systematically checking every thing. Power is every where, get a very
strong 60 MHz with the 5.3125 clearly visible on the spectrum analyzer also
counted both with a counter, checked the 85 Hz modulation on the tuning
diode, is a small signal but the same on my working M 100.
Ulrich
can you tell us more about your pre filter?
Thank you
Bert Kehren
In a message dated 3/31/2012 6:23:49 A.M. Eastern Daylight Time,
df...@ulrich-bangert.de writes:
Thomas,
Has anyone compared the M12M to the M12+?
I have done some measurements on the M12+ with typical results as
Cleaning house I ran across a Motorola GCPRP12102. Does any one have specs
pin out or any information.
Thank you
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Don
Thank you bought 2
Bert
In a message dated 2/29/2012 4:45:08 P.M. Eastern Standard Time,
d...@montana.com writes:
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
with pins, for about $8 free shipping from the
Roberto
It is called tens of years of experience
Bert Kehren
In a message dated 2/27/2012 5:16:28 A.M. Eastern Standard Time,
rbarri...@msn.com writes:
Hi Bob,
I wonder what the other oscillators that others are receiving look like in
the SA. Replacing all the capacitors would take a
Pete
Thanks for the link. Now it explains where they come from and what
condition they are in. Again I like to warn against ggg*fitting that sell
Morion
as NEW and did sell FE 5680A as NEW. I did mail my very used sold as NEW
back to them so someone will get it if you continue to buy from
Magnus
My beef is that if you advertise NEW it should be NEW. I caught him once
before and ebay made him change the listing. This time he had two listings
one new and one used. I checked with him and paid extra for NEW and got the
most banged up unit ever. All from the same stack. Finally
Just shipped my NEW FE5680A back to ggg*fitting,as you can se
below they are in a hurry to resell it. It was very used with very high
aging rate. Their NEW Morion MV89 is also not new. Be careful
Bert Kehren
HI
Friend!
Pls You as soon as possible shipping!
hank you very
All I can say this guy is a crook he knows what he is doing, selling the
same units as used and new. There are other choices. Beware
Bert Kehren.
In a message dated 2/21/2012 12:27:00 P.M. Eastern Standard Time,
li...@rtty.us writes:
Hi
I just got a couple of FE's in from the same guy.
These guys do not know what they sell. This was a marketing ploy, I did
catch him once before and made him change his listing. All a sudden he had
used and new. Checked with him, claimed he ha d gotten some new ones bought
one, looked very used took the back off, strong discoloration a give
I know this is off subject but I had such a good experience with
rdr-electronics and they list items like Rb’s and GPS receivers. I bid and won
a GPS
receiver for my FE 5680A, but based on previous questions they noticed I
had bid on the wrong one, they informed me and asked which one I
Use a MV89 or something like it and lock it to the 5680A with a 10 to 100
Hz analog filter. You will like the results at 10 GHz.
Bert Kehrenn
In a message dated 2/7/2012 12:48:57 P.M. Eastern Standard Time,
tur...@ussc.com writes:
Hello,
As has been mentioned here before, the output of
Maybe his are new. But I bought one from ggg*fitting that was listed as new
turned out very used, and in conversation with them they had to admit they
do not know what they have. If it still has its original factory setting,
measuring the frequency will tell you if it had extensive running
John
Thank you for your effort. It would be nice if you could confirm the 4 to 5
Hz dither that seems to be the loop time constant and long term aging that
will influence the GPS/Rb control loop time constant setting. I did see 1
E-12 per month which may be unique to that unit.
Bert Kehren
ggg*fitting has two listings NEW and USED. Bought a NEW hoping to get a
better unit. Based on tests unit has run at least three years. Also has dent
on case.Recommend we stay away from this one. Is a marketing ploy. Will
ship it back to day. There are other choices out there. Do not need to
My frustration is that there is very little information or discussion as to
the performance of the device, ultimately some may want to use it in their
shop as thee reference, and to make that possible more performance data
would be nice. It may be the best they have.
Bert Kehren
In a
That is also what I like to understand, and when combined with a FE 5680A
the time will be long and should be averaged over 100 if not 1000 samples,
what is the advantage? Look at the error budget.
Bert Kehren
In a message dated 2/1/2012 2:04:04 P.M. Eastern Standard Time,
Being divorced and no children writing a large check is neither a problem
nor a challenge. To me the challenge is to find solutions that are
affordable and work for every body. Sadly there is very little interest or
emphasis
in this group on this. An example the $ 10 Loran C simulator
What do you think you would gain from that. Does the LEA-6T have a TCXO?
Bert
In a message dated 1/31/2012 10:53:22 A.M. Eastern Standard Time,
att...@kinali.ch writes:
On Mon, 30 Jan 2012 17:47:54 +
Mark Sims hol...@hotmail.com wrote:
The Tbolt does not have any sawtooth error
Where can you get a LEA-6T for $ 65?
Bert Kehren
In a message dated 1/30/2012 5:34:56 A.M. Eastern Standard Time,
bruce.griffi...@xtra.co.nz writes:
The 100PPS output from Motorola receivers is phase jerked every second
in the same fashion.
Bruce
Azelio Boriani wrote:
OK, now I know
Having been on the list for only three years somehow tow-time 2009 had
escaped me. Thank you Tom and Rick for putting together such an informative
document. Probably one of the best contributions. Every member of the list
should have a copy and I strongly urge those having joined more
Maybe we should consider a group buy. With all the FE 5680A purchases it
would make sense to combine them with a good GPS receiver and a digital loop.
Since there a uP's out there that have timing functions that will be a low
cost simple solution with only a few external components. A $ 2
I take 2
Bert Kehren
In a message dated 1/30/2012 11:52:07 A.M. Eastern Standard Time,
att...@kinali.ch writes:
On Mon, 30 Jan 2012 07:37:41 -0500 (EST)
ewkeh...@aol.com wrote:
Maybe we should consider a group buy. With all the FE 5680A purchases it
would make sense to combine them
With a Rb we are talking loop time in excess of 20 minutes. Any thing other
than digital is out of reach. To day I should get my second Rb and I will
put it on aging test. The present one is better than 2 E-12 per month! I am
still hoping some one else will do an independent test. Key is
Using a $ 2 G/A (socket included) and a $ 2 PIC, four will fit on a mini
board and there are 3 boards to the order that is $ 5.17 per board. Board
is laid out, waiting for uP pin assignment and will be able to deliver in a
week board and G/A.
Bert Kehren
In a message dated 1/30/2012
What they do does not make any difference to us, what is important how
often we have to change the tuning word to meet our requirements, and if we
dither it will be an addition or subtraction from the center value. With out
dither it would be 4 times a month on my unit. That will allow a
Magnus
I fully agree, regardless of the subject if it comes from you I read it and
save it.. How ever we have clearly some new bees and this one write up is
a nice introduction.
Covers a lot of basic territory.
Bert Kehren
In a message dated 1/30/2012 4:18:27 P.M. Eastern Standard Time,
considering how important temperature is to the frequency accuracy I would
only consider fan cooling. For less than $ 10 you can have a system that
will hold the temperature at 43 C. The fan is very quit. To get best
performance I would cover all sides except the bottom plate with foam. I
Maybe there is a way to vary the C field through a digital command, in
one of their specifications I noticed a spec that stated that the frequency
can be set in 1 E-13 steps. Is there a DAC on the board?
Bert Kehren
In a message dated 1/20/2012 12:52:48 A.M. Eastern Standard Time,
Starting Sunday I will do some voltage tests, giving up on aging test, nine
weeks is long enough. I will se if the next one is as good, how ever I do
not understand all the talk about running it at a lower voltage. Loosing
regulation will definitely impact performance. I have not analysed my
In the past when I had that problem I used copper pipes as feed through the
wall and bend the pipes with a pipe bender one on each side. Never had a
problem, do not know if I would have other wise.
Bert Kehren
In a message dated 1/20/2012 1:46:32 P.M. Eastern Standard Time,
MV89 may not be the best, I have better, but specs say 2 E-12 for 1 second
and tests have shown they consistently brake the 1 E-12 barrier at 1
second. The reason I mention it is it's cost. With unlimited funds many things
are possible but my challenge is lowest cost. That is why I started
Pete
Thank you this is valuable info. I noticed that an effort is underway to
centralize info on the 5680. Would be nice if some one with time and software
expertize would combine all the information. I cut and paste what ever I
find on the list and will be glad to forward it to a volunteer.
With the # of units in the hands of list members it makes sense to
coordinate tests, characterizing the unit.
The PICTIC is probably the only other device having that kind of
penetration.
Bert Kehren
In a message dated 1/18/2012 8:17:29 P.M. Eastern Standard Time,
li...@rtty.us writes:
As soon as my next unit comes in I will run some controlled tests. This one
refuses to show aging with week 9 up in two days. I will use it for other
tests before I take it appart.
Bert
In a message dated 1/19/2012 8:18:10 P.M. Eastern Standard Time,
ed_pal...@sasktel.net writes:
I
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