If any one wants pictures of the internal guts of a HP CBT I have two
decorating my window sill. One is the RF cavity of a high performance tube. I
can take some pictures and send them.
Bert
In a message dated 8/26/2011 9:00:31 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Hi
Jeff from your description it is not clear wether the noise is due to the
UPS or 5061B. The 5061 transformer most likely will complain with a crappy
signal input.I do not trust the output from UPS since many have a crappy
output which is ok if your PC does not have PFC on the input.
I
Ulrich,
thanks for the info. Very comprehensive should be translated.
Bert Kehren
In a message dated 9/8/2011 4:52:10 A.M. Eastern Daylight Time,
df...@ulrich-bangert.de writes:
Ilja,
since I guess you read German I would like to draw your attention to my
paper
Recent comments on dewier flasks bring me back to test I conducted last
year using a nice flask that I tested extensively using the guts of a 10811
as a constant heat source. What I found and reported was that the ambient
inside changed as much as .4 C with 8 C changes on the outside. The
temperature constant
ws
Bill Harris w7kxb at msn.com
Bert:
Something to be said about no moving parts.
Bill-w7kxb
*
From: EWKehren at aol.com
Date: Sat, 17 Sep 2011 21:22:30 -0400
To: time-nuts at febo.com
Subject: [time-nuts] temperature control
Recent
Peter
I would use a PLL like the ADF 4001 because of its low noise floor and
depending of which Tbolt, its phase noise is very good. The advantage is that
you can pick the filter response in such a way that you take advantage of
the individual Osc. parameters.
Bert Kehren
In a message
Peter, it will be difficult to degrade -138dBc/10kHz using a ADF 4001. I
have PLL's using selected $ 1.00 Xtals getting better than -153dBc/10kHz.
.Axtal has units with -174dBC but out of most price ranges but I thought
you were looking at below -150,very doable with ADF 4001.
Bert
In
I know I do it all the time. That's what I spend most my time on.
Bert
In a message dated 9/19/2011 9:08:25 P.M. Eastern Daylight Time,
saidj...@aol.com writes:
Bert,
one would typically limit the loop bandwidth to something much lower than
10KHz. Say 100Hz.
This way at 10KHz the
Fiber has to follow the curvature of the earth I do not think neutrinos
do. Bert
In a message dated 9/25/2011 4:08:42 A.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
On 25/09/11 08:35, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson
If you want low noise in a spectrum analyzer it all comes down to the
signal quality into the first mixer. Every thing else with today's technology
is down hill.
Bert Kehren
In a message dated 9/25/2011 5:32:31 A.M. Eastern Daylight Time,
rob...@delien.nl writes:
One other thing is
Roy,
for its time it was the best because of the spectral purity of its Osc. The
big problem with the unit today is its CRT. Limited life and no
replacements. As rare as Cs tubes. If you can live with 1.3 GHz an excellent
choice,
the 22 GHz version because of source does not have as good
Roy
I did have a HP 8566A before replacing it with the 7 series. Same size
and weight.
Bert Kehren
In a message dated 9/26/2011 6:27:59 A.M. Eastern Daylight Time,
phill...@btinternet.com writes:
Bert
What's your opinion of the old HP8568B with its max. frequency range of
1.3 Ghz
As I said before it is even by today's standards an excellent analyzer and
I am sure there are people out there for that reason willing to pay the
money for a LCD display.
Bert Kehren
In a message dated 9/26/2011 10:56:30 A.M. Eastern Daylight Time,
n...@verizon.net writes:
The kit
The clock chip is a NS MM5313N, if I recall right one of our list members
may have an extra one. I have MM5314's would work but would require
rewiring. Good luck.
Bert Kehren
In a message dated 9/27/2011 3:37:04 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Had,
That is
Having only been on the list little over two years I may revisit a subject
covered extensively in the past. With all the know how and dead HP Cs
tubes, would it not make more sense to explore rejuvenating Cs tubes and look
at
ways to improve its performance. I have the innards of two tubes
I know people are not crazy about ebay but I use it for a source of
obsolete IC's and even transistors and there is a listing for MM 5313, try an
offer or if you want to adapt a 5314 which takes some jumpers but doable
contact me direct.
Bert Kehren
In a message dated 9/27/2011 3:41:00
It takes less than an hour to assemble I do one in twenty minutes,
programming the PICs takes me the longest, because I am not good at it.
Bert
In a message dated 9/28/2011 3:02:18 P.M. Eastern Daylight Time,
ke...@rosenberg.net writes:
On Sep 28, 2011, at 12:21 PM, ewkeh...@aol.com
The one you describe is the one I use with my 5313's, would be nice to see
how they do it, they must inject the 60 and 600 Hz further up. I do not see
how they can set the second digits at 60 Hz they would scroll awful fast.
I use a 555 but at 3 Hz, 60 Hz and about 1 KHz. My counter counts
I did purchase one of the New FE-5680A Rb's. Looking at packaging and
the housing it does look new. I have not powered it up because of +5 Volt on
pin 4. Does any one know its purpose and is there a power up sequence. Any
help will be appreciated.
Bert Kehren Miami
Thank you Bert
In a message dated 11/10/2011 1:19:13 P.M. Eastern Standard Time,
camar...@quantacorp.com writes:
I don't want to repost, but check
http://www.mail-archive.com/time-nuts@febo.com/msg37731.html. A timenuts
archive search or google will bring up that and many other
Thank you Peter
With Jose's and your input I will power it up in the morning. Mine has the
same part # and a date code 0330. Does yours respond to the trim pot, I
plan to bring out the tuning voltage to a modified Shera controller.
Bert
In a message dated 11/10/2011 5:03:07 P.M. Eastern
The FE 5680A's advertised as NEW are not NEW! A friend that made me
aware of the sale did notice clear signs of use, so I did a closer inspection
under a Microscope and found clear indications that the unit has been
bolted down in the past. Does work fine and I am looking at ways to go
I have done some more checking and identified the C field pins: one has
2.5163 V, the other 2.5294 V. Would be nice to know which one gets varied in
units with C coil adjustment. Xtal Osc. is 60 MHz on this unit. Also has an
AD 9832 in it, unit is specked at 25 MHz so it does not run off the
I did measure the Xtal and it is 60 MHz. That is the only thing I know for
sure. I did not probe the output of the DDS because with my 69 years old
hands I do not want to slip and destroy the unit, some one else may want to
test it. As a group we should be able to solve the problem since the
Pete
Thank you for your information. I agree with your findings and as I pointed
out previously it support the math that the AD 9832 is used for tuning.
That allows them to set the Rb at the optimum operating point based on their
gas mixture. What I like to know is how they control the C
Paul
it is listing # 250911887702 from ggg*fitting. I think we will see prices
dropping even more since there are only so many time-nuts.
Bert Kehren
In a message dated 11/12/2011 10:14:18 P.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Kind of joining in late.
Might this be the
Pete
That is exactly the same math I did, there is no other choice but it would
be nice if some one can help on the C field. I just finished mounting it on
a heat sink added a Toshiba 15 V 3 A power supply and a 7805 and will run
it for a month with out changing any thing. Will read it twice
The DDs is part of the Rb loop, the PLD divides by 3 and 2, the 10 MHz is a
direct function of the XTAL. I am sure the PLD also has other functions.
Older models had a 50.255 XTAL with a DDS on the output, I think the change
occurred some time between 2000 and 2002.
Bert Kehren
In a
Pete
Thank you for doing all the work. This is great info and will help all of
us that want to discipline the beast. One more question, since you have done
so much testing is there one pin on the connector that has nothing
connected to it?
Thanks again Bert Kehren
In a message dated
Pete
Thank you, I will look at its some time in the future, right now I let it
cook for a couple of weeks undisturbed and than I may cut the trace that
seems not to do any thing. If you have a 100 MHz scope it will trigger on any
pulse in this unit unless your scope is defective. I think
Pete
reading your description of the C field circuit they are not doing any temp
compensation or adjustment to the C field like other manufacturers. Seems
like they have determined an optimum current and do all tuning with the
DDS. Makes sense. It would be nice to find out what the current
Pete
again thank you very much
Bert Kehren
In a message dated 11/18/2011 6:33:13 P.M. Eastern Standard Time,
bell.pe...@gmail.com writes:
Hi, Bert
1.110V - so presumably the c-field current is about 4.1mA.
Regards,
Pete
On Sat, Nov 19, 2011 at 6:16 AM, ewkeh...@aol.com wrote:
As part of testing the FE 5680A for aging over two weeks, all I can say
that the rate is low (2 E-12?), since temperature sensitivity masks aging.
Performing temperature tests, I get 4.3 E-12 per degree C. I plan to
temperature control the heatsink and perform additional tests and start
Searching on our favorite auction site for a not time or frequency related
project I ran across a Bluetooth adapter 190527209620 and 190508188703.
After checking with some of you, smarter than me, I am convinced this module
will work as a Tbolt interface, eliminating that pesky cable and
Murray
Thank you for the info. It would how ever tie up equipment which I want to
use for other projects. I am only looking at the FE5680A once a week and
since we have right now what we call Chamber of Commerce weather the AC is
most the time off. Temperature control will be a must any way,
Mark
10E-13 at 100 sec is a wide range. What about at 1 and 10 sec. and are
you talking about 3, 5, 9 E-13.
I personally have quite a few 10811's that brake the 1E-12 from 1 to 100
seconds my best OCXO is a Datum 1000 that is 3.5E-13 at 1 sec. and 4 at 10
and 7 at 100 sec. I control it
Mark
As to measurements below 100 sec. the Dual Mixer I have been working on is
out there beeing tested by six people with good results, what is missing is
the link between the counter and Ulrich's plotter. Some smarter than I
have made patches using other plotting software. Corby has been
I bought one just for the heck of it for $40 plus shipping. It was
advertised as new, (he has changed his listing) but it was not factory new, had
been installed at one time but no sign of usage. It had also not been
tunedsince leaving the factory and it was within 5 E-11 after a day. After
RS232 is used to set frequency. There is no control of the C field
Bert Kehren
In a message dated 12/8/2011 5:37:56 P.M. Eastern Standard Time,
albertson.ch...@gmail.com writes:
On Thu, Dec 8, 2011 at 2:10 PM, Bob Smither smit...@c-c-i.com wrote:
See attached. I have not verified
Pop the lid and look if it has the 60 MHz osc. or just connect the RS 232
and it will tell you the settings, all units with date code 2003 are of the
new design with the DDS, the ones with variable frequency output you will
not get for $40
Bert Kehren
In a message dated 12/8/2011 9:04:21
Paul
I was exactly where you are. The last thing I needed was an other Rb. But
an Rb at $ 40 I did bite the bullet and running the tests I do not regret
it.
Bert Kehren
In a message dated 12/9/2011 10:11:06 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Marco I understand
Sorry I ever started this. In the past the FE5680's started out with a
50.255 MHz XTAL, some time in the 2002 2003 timeframe they switched to 60 MHz
using a DDS in the loop. All of these units can only be stepped in 7 E-13
steps limited by the resolution of the DDS. Having followed all the
Connectors cut off so it can not be used in its original application?
Bert Kehren
In a message dated 12/19/2011 10:55:31 A.M. Eastern Standard Time,
ed_pal...@sasktel.net writes:
It's not paranoia if it's true! :-)
Take a look at the pictures for # 270725678037 . These boards don't
have
As soon as I have finished the aging test, I will use a Shera controller,
controlling the C field and the 1 pps output of the Tbolt. Having controlled
all my Rb's with GPS/Shera with good results I will continue in that
directions, unless some one can direct me in a direction with a better
Using the digital input will only give you 7 E-13 steps. I will use it for
preset.
Bert Kehren
In a message dated 12/22/2011 2:50:23 P.M. Eastern Standard Time,
albertson.ch...@gmail.com writes:
On Thu, Dec 22, 2011 at 9:52 AM, Chuck Forsberg WA7KGX N2469R
c...@omen.com wrote:
You
I just got back from running an other test on my 5680 and for 24 days now
it has been reading consistently 9.944 MHz! I average over 1000
seconds because feeding two Tbolts into a Tracor 527E I do see up to +_2 E-11
changes off and on, and one runs all my instruments. I am waiting
Over the last two years along with two list members that may want to pipe
in, I have spend a large amount of time on D/A's and we went as far as
developing a test board using the LTC 2440 and testing numerous D/A's taking in
to consideration performance, solderability, cost, availability
In my opinion you have to look at it from the point of application.
Hopefully I will be able to share the test results soon. For us DNL is key, INL
is specked over the full range and since we use it in a filter application,
based on the data that I have, can be ignored.
In a Rb application
The test I have been conducting for the last 6 weeks uses a 15V 3A Toshiba
switcher feeding the 5680A through a filter and a 78M05 for the five volts.
For the last 5 weeks I have temperature control and I still se no aging.
As I mentioned before I read 1E-12 over 1000 seconds since Tbolt
I do not care for this test but later on I will use a LDO and a clean up
OCXO.
Bert
In a message dated 1/6/2012 12:37:46 P.M. Eastern Standard Time,
li...@rtty.us writes:
Hi
What are you using the Rb for?
A switcher is going to put even more hash on an already dirty 10 MHz output
on
I do not understand why this is even discussed. Running at lower
temperature will extend life and using a fan with temperature control will cost
no
more than $ 12 and I challenge any of you how I can get for so little money
more than one order of magnitude improvement. As I reported before
In some cases they have been cough having some one bid up the price.
Bert Kehren
In a message dated 1/9/2012 11:05:01 A.M. Eastern Standard Time,
ed_pal...@sasktel.net writes:
On 1/9/2012 7:21 AM, gandal...@aol.com wrote:
Hi Roy
There's some very good stuff coming out of China via
I am in week 7 and still se no aging at 1 E-12. Look forward doing other
tests like voltage sensitivity and bringing out the C field for external
adjustment. Right now hands off. Frustrating but I am determined to get some
aging data first. I do not know if keeping it nice and cool helps
with the good long term performance of Rb's and the presently available
5680A for $ 40 a Shera Type controller will make available to any one on the
list a reference better than a Tbolt for less money than a Tbolt. Repeating
my self I would also add a clean up OCXO in order to get the very
Bringing out the C field in my estimation does not effect long or short
term. External magnetic field I think is a joke. An other option is a loop
that generates a tuning word for the DDS but that means your steps are 7 E-13.
Bert Kehren
In a message dated 1/12/2012 10:34:10 A.M. Eastern
I have experimented with it find that to take advantage of the OCXO you
should use its full potential which means long time constant and I was not
able to get good results. It would have saved a loop but I would not interfere
with the 5680 internal loop because we do not know how it
Paul at least you are on subject.
Bert Kehren
In a message dated 1/12/2012 11:21:19 A.M. Eastern Standard Time,
p...@sehorne.org writes:
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am
I hear all these ideas from paper tigers. How about building something and
report on it. I can do a Shera for $ 40 and add a $ 20 GPS. And it works.
I did fail to mention that I also have retrace data. Over the test period I
had at least 10 power outages from seconds to a couple of hours.
Nigel
I did not program it, it had its original setting and it is 9.944
which is -5.6 E-11, within 10 MHz which is within spec. Once I have some
aging I will look at Voltage sensetivity.
Bert Kehren
In a message dated 1/12/2012 6:22:02 P.M. Eastern Standard Time,
How are you going to measure and adjust and to what level. What error can
you live with?
Bert Kehren
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and follow the
What we know is that you can set the Rb in 7 E-13. Dithering would allow
even closer setting, the question is what rate will the Rb accept with out
loosing lock or deterioration of the performance. Some one should explore
that. I am still waiting to se some aging. Taking the 10 MHz output
did a preliminary layout and priced it with expressPCB and in 30 quantity
the board would cost $ 5 !!! Any expert willing to volunteer.to do the
loop?
Bert Kehren
In a message dated 1/13/2012 6:20:25 A.M. Eastern Standard Time,
ewkeh...@aol.com writes:
What we know is that you can set
I am looking at using a Austron 1150 in a Tbolt has any one done it or is
there any one out there that has experience with the EFC. I want to proceed
carefully before playing with the EFC.
Also one of the 1150's says power 12-28 Volt, does any one have experience
with that.
Thanks Bert
I recommend we talk. I am flexible, using 24 bit A/D will blow the budget
and there is no way to do it for the cost goal.
Bert
In a message dated 1/13/2012 11:16:38 A.M. Eastern Standard Time,
albertson.ch...@gmail.com writes:
On Fri, Jan 13, 2012 at 3:19 AM, ewkeh...@aol.com wrote:
we would be talking +- one step and using different rate but reading the
frequency over 1000 seconds would be my answer. Start at 1 1 Hz rate and
observe the lock indicator. At the same time measure frequency.
Bert Kehren
In a message dated 1/13/2012 12:52:16 P.M. Eastern Standard Time,
If dither is a consideration it will be the most critical test.
Bert Kehren
In a message dated 1/13/2012 12:52:16 P.M. Eastern Standard Time,
li...@rtty.us writes:
Hi
Another thing that would need to be investigated - How fast (and how
uniformly) does it respond to a frequency set command.
I think the dither issue should be explored separately. Its finding should
be included in the Controller. During development I understand the need for
on the board programming, but unlike OCXO's which there are many of, I
envision this controller dedicated to the FEI 5680A using 10 MHz and a
Can some one tell me which RS232 chip is used in the 5680.
Thank you.
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wrong there is no DAC involved, it is a DDS
In a message dated 1/13/2012 3:36:33 P.M. Eastern Standard Time,
charles_steinm...@lavabit.com writes:
Bert wrote:
we would be talking +- one step and using different rate but reading the
frequency over 1000 seconds would be my answer.
Rather
Thank you. That takes care of it.
In a message dated 1/13/2012 3:58:47 P.M. Eastern Standard Time,
jmfra...@cox.net writes:
Mine reads:
MAX3232EWE
0332
and has a 16 SOIC(W);16 pin package.
John WA4WDL
--
From: ewkeh...@aol.com
Sent:
Dither is only an issue when using a control loop. The difference is that
with dithering you eliminate the D/A portion which doubles the cost from $
15 to $ 30. I personally prefer the analog approach. The same design can
have both options. Part of the program.
Bert Kehren
In a message
Can you do the programming?
Bert Kehren
In a message dated 1/13/2012 3:56:47 P.M. Eastern Standard Time,
d...@montana.com writes:
I would just use a picaxe, has a simple to use IDE and several different
sizes. No need for assembly, cheap enough for quasi-production.
Don
Chris Albertson
Are we not overdoing it. 7E-13 for $15 KISS, and if you want to go beyond
that use a $ 30 analog version.
Looking right now at 1 E -14, I do se temperature influences, with my heat
sink stable to .1 C. Mainly due to the fact that is only one side of the
unit and it is clearly designed to use
The controller looks at the 10 MHz from the Rb and a 1 Hz signal from
either a GPS or a tbolt. Over the years I have been very happy with the Shera,
except for the DAC. I control my Rb,s to .1 C.
In a message dated 1/13/2012 6:06:05 P.M. Eastern Standard Time,
albertson.ch...@gmail.com
I have no expertise when it comes to filter design or programming PIC's or
other micro controllers. But I know what works for me. For 11 years I have
been using Shera controllers with very good results. (I still have some new
assembled extra AA boards, if any one is interested, please
I am staying out of that discussion due to lack of knowledge, My question
is wether the input circuit is acceptable or if some one has a different
solution. We have integrated the Shera input including the interrupt counter
on the chip, so there are only three interface pins, interrupt,
Magnus I agree,
I can not se how any one can simplify this approach. A $2 gate array in a
0.5 $ socket that is solderable, a $ 2 14 pin DIP uP what ever brand, a
clock generator, a RS232 interface, a 3.3 V regulator and two single gate 14's
what more do you want. If communication is
Thank you Paul.
By the way the GA programmer cost $ 10 and the software is free and
relatively easy to use. Has most TTL functions in its library!
Bert Kehren
In a message dated 1/15/2012 11:27:50 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
I have been watching for a bit now.
I recommend bluetooth
Bert Kehren
In a message dated 1/15/2012 1:32:37 P.M. Eastern Standard Time,
hmur...@megapathdsl.net writes:
albertson.ch...@gmail.com said:
So I want to be able to connect a desktop computer and a USB cable is to
short.
You can get USB cable extenders. They are
One 14 pin uP along with a MAX3000A will do it hands down.
Bert
In a message dated 1/15/2012 2:43:54 P.M. Eastern Standard Time,
davidwh...@gmail.com writes:
I would just use a PIC, AVR, or ARM even if I had to use more than one
with some discrete logic on the side but I like solder,
The MAX3000A and the PIC can be bought any place in the EU.
Bert Kehren
In a message dated 1/15/2012 2:09:24 P.M. Eastern Standard Time,
xne...@luna.kyed.com writes:
On Sun, 15 Jan 2012 16:45:56 +0100, Magnus Danielson wrote:
I could also roll my own CPU, as I have already done before,
Why do it easy when you can do it difficult. With my Lab setup the
frequency out of the Tbolt changes once in a while to correct the 1 PPS. That
is
how I explain what I se on my Tracor 527E. Maybe I am wrong.
Bert
In a message dated 1/15/2012 5:12:18 P.M. Eastern Standard Time,
After eight weeks of monitoring to 1 E-12, I still se no aging. Waiting for
a change so I can do other tests. One thing I clearly se is a 4 Hz filter
response changing the output by +- 3 E-11. It may be more, will have to
find a way to check it more accurately, because of limited response
I am using a fan that holds it within .1 C Its been month since I measured
it but I did report it here and I think it is 42.7C.
Bert Kehren
In a message dated 1/17/2012 11:30:07 A.M. Eastern Standard Time,
n4ua...@gmail.com writes:
Bert,
Since you have been running your unit for a long
There is already to much clutter on the list if you want more info contact
me off list.
Bert Kehren
In a message dated 1/17/2012 11:42:23 A.M. Eastern Standard Time,
n4ua...@gmail.com writes:
OK, I remember the fan controller discussion; don't know why I didn't find
it just now when I
I am, as I reported previously using a SMD LM335 away from the fan and held
down with a screw and a small bracket and I get consistent .1 C. I do not
think that I would get 1 E-12 over weeks when my lab has seen more than 5
C temperature changes if my temperature readings are not correct.
*
albertson.chris at gmail.com writes:
On Tue, Jan 17, 2012 at 8:38 AM, EWKehren at aol.com wrote:
I am using a fan that holds it within .1 C Its been month since I
measured it but I did report it here and I think it is 42.7C.
0.1C is very good for just using a fan. What
Looking at the unit I think a lot of thought went into the total design and
cost may have been the main driver, but overall performance is
impressive.. It would be nice to have some one tackle that approach, the
ribbon cable
will make it easier but still some other elements will have to
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
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,
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
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
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