Hi Magnus
That is not what I said.
Bert
In a message dated 3/1/2014 10:39:30 A.M. Eastern Standard Time,
mag...@rubidium.dyndns.org writes:
Hi Bert,
On 14/02/14 17:55, ewkeh...@aol.com wrote:
Attached the innards of a FTS 2000A. The unit obviously does not have a
thermal fuse. Solder
that's right
In a message dated 3/1/2014 7:26:07 P.M. Eastern Standard Time,
mag...@rubidium.dyndns.org writes:
Hi Bert,
I guess you said something unprintable.
Cheers,
Magnus
On 01/03/14 23:05, ewkeh...@aol.com wrote:
Hi Magnus
That is not what I said.
Bert
In a message dated
You have not said any thing as to what you expect to get out of the DDS
and how important certain parameters are. We recently did a AD 9913 that Tom
tested extensively http://www.leapsecond.com/pages/ad9913/ using a single
supply for the DDS. Some may take exception but it works for us. The
Correction I did put pin 4 on the same regulator as the PIC. Had to have
one for the PIC so why not use it. Do not know if it made a difference.
Bert
In a message dated 3/16/2014 3:58:20 P.M. Eastern Daylight Time,
ewkeh...@aol.com writes:
You have not said any thing as to what you
Quite a few time nuts have Rb GPSDRb's running using Shera's controller. I
did mine in 1999 with the help of Brooks and Corby and my first FRK died on
Shrea's controller after 24 years of service. Bad lamp.
Have to measure C field sensitivity just like on an OCXO and increasing
sample time
Depends on what you call close. 1 E-14 steps are very doable. That does not
mean that that is the accuracy because once you go below 1 E-12 you have
to worry about barometric pressure and humidity assuming you already have
temperature control.
Bert
In a message dated 3/21/2014 2:58:32
Some use DAC's some use DDS' the FE 5680 uses a DDS.
Bert Kehren
In a message dated 3/21/2014 3:17:12 P.M. Eastern Daylight Time,
hmur...@megapathdsl.net writes:
albertson.ch...@gmail.com said:
There seem to be two different class of Rb. One takes an EFC just like
the
OCXO so the
Paul
Do not understand your question, what do you mean with tight?
Bert Kehren
In a message dated 3/21/2014 3:22:41 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Hal
Actually now that you mention it was the DDS chip.
Bert
I agree with your comments. How tight can it be.
Thanks
Hi
There are many issues when it comes to a GPSO. But what has to be first
discussed what is it one wants to accomplish. Last year when we worked on the
latest Shera GPSDO we always got better than 1E-11 with a unit lying on
the bench with no enclosure or thermal management.
Chasing
The lowest cost solution is a DS chip in combination with a PIC. How ever
has any one thought about a fix by going to the source of the problem. The
TCXO. Use a DDS with internal multiplier like the AD9851 or AD 9913 and use
the sawtooth message from the GRS receiver and change the
Yes if you want to use it only in a GPSDO and it is being done but if you
are a time nut you may want the 1 PPS..
Bert Kehren
In a message dated 3/25/2014 6:33:12 P.M. Eastern Daylight Time,
albertson.ch...@gmail.com writes:
On Tue, Mar 25, 2014 at 5:44 AM, ewkeh...@aol.com wrote:
The
All Rb's have XO's and with the exception of the HP5065C all Rb's influence
long term stability only the only exception is the HP which uses a TC
below 0.1.sec, and as Corbe demonstrated ADEV is controlled below 1 sec. by
the
cell. The same can not be said with other Rb's.
Bert Kehren
The QEX unit is a spin off of the Shera, how ever the DAC is only 12 bits
covering the full tuning range of the Rb. Shera does it better with 18 bits
and has additional features. I would not spend the money to get a copy.
Bert Kehren
In a message dated 3/28/2014 2:42:55 P.M. Eastern
Am experimenting with small low cost GPS antennas and am considering as an
alternative RTV/silicon. Any information on RF attenuation of RTV/silicon
at 1.6 GHz ?
Bert Kehren
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The Gerber Baby Food Jar at Wall Mart $ 0.49
In a message dated 4/15/2014 1:03:40 P.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 4/15/14, 8:13 AM, ewkeh...@aol.com wrote:
Working off list on a super high performance GPSDO but low cost thanks
to a
time nut (sorry forgot
Having five GPSDO's running and some for over 14 years I have a very
sophisticated and expensive antenna system. This is part of a project that with
the disappearance of Tbolts and other commercial GPSDO's to make available
to time nuts state of the art performance at an affordable price,
Washed all three down the sink
Bert Kehren
In a message dated 4/15/2014 3:18:34 P.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 4/15/14, 11:02 AM, ewkeh...@aol.com wrote:
The Gerber Baby Food Jar at Wall Mart $ 0.49
Is there a particular kind of food that works best?
Having done extensive testing on the ublox 6M that you can buy with antenna
for less than $ 23 new from DX.com I can say with certainty that the 1 Hz
pulse is better than 1 E-9 accurate, closer to E-10. Depending on the
counter it could be used to adjust a frequency counter to that accuracy.
Chris
I am not sure if you want to measure temperature or control a fan. To
measure there are many options depending on how much money you want to spend.
To control I suggest either a LM 335 or a NTC resistor. I have worked
extensively with both and for measuring I have now downsized to a
The thunderbolt is one of the best timing devices but not for frequency, if
you want high resolution. Over time it is ok but high resolution short
gate times and you see the frequency changes. They use the OCXO to correct for
timing error and if you have a Tracor 527E you can see it. Also
And quite a few companies use them.
In a message dated 4/26/2014 8:27:57 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
There are a number of timing receivers on the market. They still are a
very small percentage of the total units sold. A lot of people play with the
uBlox parts.
Welcome to the nuts Tony
You are not specifying exactly how accurate time has to be but in my book
and based on tests the most reasonable priced GPS with 1 pps is a Ublox 6M
that you can get with antenna for less than $ 22 antenna included from
_www.DX.com_ (http://www.DX.com) . They have
I am not advertising for DX but I have bought 4 with good results and their
units have a 5 V regulator on it. Some have even a TTL to RS converter on
board.
Bert Kehren
In a message dated 5/2/2014 11:40:47 P.M. Eastern Daylight Time,
tn...@toneh.demon.co.uk writes:
On 03/05/2014 00:59,
Tony
There seem to be many variables. Cost, power, how many, overall stability
etc. Most likely you will find that the GPS module is not the most expensive
part but the VCXO. It also makes a large difference if it is one off or a
larger volume is needed. You can always find a bargain, and
The original price of the STEL1173CL was $ 125 in quantity 10 so $ 65 is a
bargain. I have no idea as to how it is used in the 4065A but if it is
limited to 13 frequencies it may be worth wile to take a look at the AD 9913
it is capable to produce very precise frequencies exceeding its 32
Traced the problem of my FTS 1200 to the first BC109 Transistor on the
A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor
low noise is critical. This unit is at least 30 years old and my question is,
what transistor will have even lower noise than the than low noise
Thanks for all the help. I do have a couple of BC 109 but I thought with
all the work to carefully disassemble the unit that after 30 years there
would be a better transistor.
Thanks again
Bert Kehren
In a message dated 5/17/2014 6:47:55 P.M. Eastern Daylight Time,
csteinm...@yandex.com
Joe
I am German living in the US. The site does ship to the US and once the
product is available middle June If necessary I will be glad to help.
How ever we have time nuts living in Germany and some probably have bought
from this site. They can log in and find out what then payment options
I think there is confusion between where there is a negative delay. Yes the
M12 can have a negative value but in order to correct for the full range
of the saw tooth at zero the DS chip has to add 128 nsec delay plus the zero
value. Depending on the message it ads or subtracts from that
The question is what is the definition on time. Yes it will be always 140
nsec late to what the M12 calls zero. Good for a GPSDO. How ever if you want
it to relate to NIST time more hardware is needed unless you can
compensate that 140 nsec in antenna delay.
A simple solution would be a
This may be off topic but I did check with Tom and many time nuts may have
HP E3610A power supplies on their bench and mine smoked a ublox GPS so that
makes it topic related..
The reference section has some 1 uF 50V capacitors and in my unit one
shorted. The reference section has fuses on
Brooke NO
Bert
In a message dated 5/22/2014 3:12:56 P.M. Eastern Daylight Time,
bro...@pacific.net writes:
Hi Bert:
My E3617A has a front panel adjustment screw for Over Voltage Protection.
Does the E3610 have that?
http://www.prc68.com/I/Capacitors.shtml#SupCMeas
Have Fun,
Brooke
Having used lately ublox 6M for GPSDO work I decided to buy a couple of MAX
7C's on ebay for $ 16.00 181293242043
Super results. We are going to do some saw tooth analysis but most likely
will not post them because the deterioration of the list has resulted in
many on the real time nuts
Don
I will continue to be part of the list but am frustrated with the loss of
some of the best we used to have and I do not consider my self one of them,
but I learned immensely from then. I am not the only one with that opinion
looking at the number of responses I am getting.
I do not know
There have been a couple of questions on and off list. as to the specific
listing. I did forget to mention one thing. The unit comes with a built in
antenna. For time application not exactly what we want Not easy to take
off since it is a block of ceramic with a pin through the center with
Paul we need to talk about 405 many things happening. I will be out from 11
till 3 otherwise at home.
Bert
In a message dated 6/18/2014 10:41:32 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Bert just finding out that google mail is treating your emails as spam!
Not sure if
Tom
I am not concerned having followed the discussions lets see what comes from
it. Based on the response, we will have our hands full.
Let me make clear I take credit for instigating it but it involved five
people that at this time have chosen not to be mentioned.
Bert.
In a message
It is a shock and a loss not just to time nuts but many others that where
touched and benefited from him.
Like in the case of Brooks I know what I will do and I urge those of you
that knew him through any type of contact make the old fashioned proper thing
by sending his wife a letter or
The response has been very positive such that a $ 45 kit is doable. Working
on getting at least two beta tests lined up.
However it is disappointing that no one has stepped up to tackle the
temperature problem. how many have looked at the temperature attachment and
clicked on the N5TNL link.
Again we are talking past each other I am talking about temperature
compensation with the DDS that ideally should be removed. Those steps upset
any
loop.
Bert
In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time,
hol...@hotmail.com writes:
Check out the temperature control
Lets be clear the 1 E-13 is a totally different project and does not relate
to the FE 5680 A. Yes most likely we will use the same universal
controller but with different code, same board. GPS crosses the 1 E-13 line at
10 seconds little more than a day. I whish it was just temperature
We use NTC 10K with the FRK. Precision is not important.We have to play
with the settings in order to have fan starting voltage over the full temp.
range.
Bert Kehren
In a message dated 6/24/2014 8:12:45 P.M. Eastern Daylight Time,
shali...@gmail.com writes:
After having tried just
I probably should have called it more correctly frequency control. Thanks
to the help from Scott N5TNL we clearly where able to watch the DDS as fan
cooling was added and removed from the Rb. Only a small change resulted in
the DDS tuning word changing by 89 which is a frequency change of 6
Because the 96K attachment needs moderator approval I am sending it again
without attachment. It is the one I posted before and shows clearly the
frequency jumps. So here is the rest of it.
Magnus
Sorry but I disagree with your statement. First and foremost we have to
accept that these
Thanks Bob for putting it in perspective, 0.05 C is very doable, looks like
it is also used in some OCXO's.
Bert Kehren
PS on a related subject I just pulled PROCEEDINGS OF THE ANNUAL SYMPOSIUM
ON FREQUENCY CONLTROL ATLANTIC CITY in the late 70's did attend a few
because of my involvement
I can only answer some of your questions. The tuning word is modified by
the temperature but if it came back to the same oven current it will again
have the same tuning word to the DDS.
Since we have not fount a temperature sensor they most likely use oven
current that Bob mentioned.
If you
Will someone beside us use heat pipe. Would love to have an impendent
input. What does it take to get a test going. Scott has done a lot of work, how
about some one else step up to the plate. There are a lot of time nuts out
there with the 5680A,many for the first time will have a very good
After talking with Hartmut off list and finding out that no family lives
close by I decided to send this letter shown below in German, hand written
on German condolence stationary to his neighbor and friend. The English
translation is below.
Sehr geehrte Herr Hackfeld,
Als Erstes möchte
First let me thank again Scott Newell for all the work he has done. The
links included in this post where made possible by Scott. All three exceed
the limit of time nuts but will give you a better understanding as to what is
going on. First removing the 10 K resistor changes the Rb frequency
Some how a dot snuck in at the end of the second link after the s you can
use the old link and delete the dot or use this one
http://n5tnl.com/time/fe-5680a/gpsdo/JK5680A_Test35c.xls
Sorry about that
Bert Kehren
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time-nuts mailing list --
Good Morning Angus
Let me start out by saying the FE5680A project was intended for time nuts
and the unit will not be part of our bench, so the work on it is limited. As
far as Rb's are concerned our focus is on FRK and HP5065. Looking back I
would most likely not suggested it, had I known
In the seventies I did for some friends that had FCC First class licenses a
counter that on the input had three J/K F/F's to subtract the IF from the
LO. They modified receivers including running the IF in to saturation and
they certified stations without going there.. I think measurements
As part of the FE 405 B project a separate output circuit is in the works.
The universal controller and auxiliary board are the same as used in the
FE5680A GPSDO but because of the very low ADEV a separate circuit board that
divides by three and has also two ground isolated transformer
The development phase of the FE 5680A disciplined controller is nearing
its completion in no small part thanks to Scott's work on frequency/
temperature control. As I have pointed out in the past we have no plans to use
the
5680 so Juerg is considering selling his FE5680A along with
Thank you Alex I have that info I am concerned about rise time
Bert Kehren
Sent from Samsung tabletAlexander Pummer alex...@ieee.org wrote:
look Charles Wenzel's waveform conversion:
http://www.wenzel.com/documents/waveform.html
73
Alex
On 7/10/2014 11:40 AM, br...@ko4bb.com wrote:
On July
Magnus
Thank you for your recommendation I use Wenzel extensively as a matter of
fact I just completed in the last three days two boards that have Wenzel on
it and in my projects I can count 14 boards. Rise and fall time is my
concern but I am open to suggestions that is why I turned to the
Will the added stage negatively effect ADEV?
Bert
In a message dated 7/10/2014 3:48:44 P.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Bert,
OK, good that you are familiar with it, it was not obvious in that message.
If you consider it as the first stage, and that you
Bruce,
please make those tests it will help me to how to proceed and probably many
other time nuts.
Bert Kehren
In a message dated 7/11/2014 3:50:36 A.M. Eastern Daylight Time,
br...@ko4bb.com writes:
The Achilles heel of that biasing technique is that the emitter currents
of the
pair
What I am missing in all these discussions is what do we want to archive
or is this an other paper only discussion. I am used to starting out with a
goal, and tackle the challenge from there.
We have a saying in German Papier ist geduldig. Translate You can write
any thing on paper.
Bert
Hi Tom
I agre the educational aspect of time nuts is great and I have learned a
lot but it would be even more useful if discussions include what can be
attained and what may be in the reach of time nuts. I used to have a HP 2804A
with matched probe prom only used it once when developing a
Slow is not a problem in our applications the loop takes care of that. Will
look in to PT 100.
Bert Kehren
In a message dated 7/21/2014 8:19:48 A.M. Eastern Daylight Time,
alex...@ieee.org writes:
NTC are not that very stable, they are amorphous material winch could
recrystallize
Thank you Charles
. As a first step I will fill one of my Tbolt boxes with small foam
particles. Sounds like a good idea. I have one unit where I have given
particular
attention to low power from the power supply.
Bert Kehren
In a message dated 7/21/2014 7:43:49 P.M. Eastern Daylight
Having had more than ten FRK's and M100's on my bench and once locked none
where as low as any thing in E-9. What you should buy is a ubox for $ 16
shipping included and you will with your counter be able to get better than
1 E-9 for testing.
Bert Kehren
In a message dated 8/10/2014
I am presently downsizing and that has also resulted in shrinking my HP 70
000 series spectrum analyzer. Out with the 70310A OCXO reference. The unit
has a McCoy OSC92-13B OCXO. The original price was $ 5000 and the option
with out OCXO was a $ 2500 saving. Some OCXO. Does any one have any
There is no question that direct fan control in combination with a heat
sink is the best solution and we use it on FRK and M 100 with proper thermal
insulation we get 0.01 C on the back plate and better than 0.1 C on the
front. For us the FE 5680 A is not in that class so we looked for a
Knowing a litle bit about semiconductor production it is safe to assume
that all 7M series divvices have the same chip and during production at ublox
some features are disabled or enabled. The result is one mask set one chip
run and one inventory.
I did see a recent announcement where a 7M
I recall when the LEA-M8F was announced that they mentioned a VCTCXO and
maybe I wrongly assumed that they used it for sawtooth correction they also
mention ability to control in addition an external OCXO. I previously
suggested using saw tooth correction information to tune a TCXO but that
Be patient as soon as we have finished rollout of the FE 5680A and FE 405 B
GPSDO I will be off the list.
Bert Kehren
In a message dated 8/19/2014 9:31:50 P.M. Eastern Daylight Time,
csteinm...@yandex.com writes:
Bert wrote:
I guess time nuts like to talk about it but not fix it.
Sorry but I disagree. Having done extensive work with the M7 and M6 in
connection with the with GPSDO work we are doing we have characterized the
units extensively. First from what we can see the difference between a SSR-6T
and a $ 16 M6 is that one has a TCXO and outputs sawtooth
Ed
We may be talking past each other I had problems with the statement that
the basic M6 and M7 are not suitable for GPSDO's. They are not GPSDO's in
them self but great GPS engines even without saw tooth correction which is an
impossibility since the data is not available. But as you
Hal there is not one straight answer, as mentioned before these units are
intended for commercial applications with large temperature ranges. Most
have added frequency compensation using heater current sensing for C field
adjustment or in the case of the FE 5680A DDS control. Looking close
Charles
I agree with every thing you wrote and I am implementing many of your
recommendations. Forty years ago I bought a 15 foot Alu channel to make small
frequency counter housings, always small, and at the time I did have access
to a machine shop so I made end plates. Still have five
Bob which Efratom are you talking about?
Bert
In a message dated 8/24/2014 6:33:12 P.M. Eastern Daylight Time,
kb...@n1k.org writes:
Hi
It is not what is done in the Efratom Rb’s. Their pps input is set up to
get things on frequency / on time quickly. The assumption is that you plug
it
Charles
I use double bobble pack inside the Alu channel and I always start out by
monitoring the OCXO and make sure it is at least 10 C below the spec range.
The tbolt is center located and I use a combination of rubber mounts but
suspended that they sell for hard drives and squares of
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
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
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
Does any one have the schematic of a FTS 1200 OCXO ?
Thanks Bert Kehren Miami
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and follow the instructions there.
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
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
Dave
Thank you for your offer. I think I have the documentation solved. Brian,
who helped in the past has offered to help and has some of the previous work
to build on.
As to PIC programming I will ask Juerg to get with you off list.
Bert
In a message dated 11/19/2012 8:47:25 P.M. Eastern
I have checked my inventory and I have boards and parts for a couple of
dual mixers and counters. I will work with some ones that are willing to build
and test them right away and have a good quality OCXO for offset like a
10811 or Morion and a second high performance OCXO for measuring
be able to handle 56 K RS232 and use AV software, to me that is not
trivial, and Juerg is to busy to hold hands beside me.
Bert
In a message dated 11/20/2012 11:33:44 A.M. Eastern Standard Time, croma6
4...@yahoo.it writes:
Hi, Bert,
no problem for the OCXO's (10811, Morion, ALtra CPLD)
Yes Bruce I have the paper. I am not suggesting to copy it verbatim but if
there is a way to reach reasonable priced 1 E-14 members of the list should
pipe in. I am willing to do an other board. the rest of the systems well
on its way. Einally after three years.
Bert Kehren
In a message
There is no schematic, it is beside the Wenzel all in the MAX 3000 a string
of dividers and depending on what we want selected outputs and all outputs
have synchronizers to the input to reduce jitter.
Bert
In a message dated 11/20/2012 5:22:50 P.M. Eastern Standard Time,
We are working on a documentation package and it will the thanks to Didier
on his site. At this time three items are available and tested. A basic
dual mixer based on the original NBS paper with modifications, a 2 channel
counter and a 4 channel counter. Juerg is working on a LCD display
Paul
Frankly I do not think I will live long enough to see a time nut build a
fountain Rb. Over the four years I have watched many smoke and mirror
projects with nothing coming out of is. In German we have a saying: paper is
patient. We should walk before we run.
Many members did buy a FE
In a message dated 12/4/2012 6:10:36 P.M. Eastern Standard Time,
docdai...@gmail.com writes:
I will build one right away.. but I didnt see your request. My problem is
surface mount components (the multipin or no leads)... I am not confident
in that. but I would certainly try. I am
Chris
There is a low cost solution and I have the input circuit perfect for GPS
on a $1 gate array I have boards and am presently using Shera original
version. Would like to buy his version 402NE but have not been able to get a
response from him. Have repeatedly asked for help on this list
How about quit talking and build something and show us some results!
Bert Kehren
In a message dated 12/6/2012 2:09:38 P.M. Eastern Standard Time,
d...@nap-us.com writes:
Bob,
Did Atmel (AVR) kill your dog or something?
They have some pretty powerful MCU's. Are you flatly stating that none
Paul
I agree. That is my main frustration, lot of talk no results. The good part
of time nuts is that I have made some very good contacts that share my
interest of actually building some things and results are great.
Remember the Loran simulator?
Bert Kehren
In a message dated 12/6/2012
We have a choice of two dual mixers, my copy of the original NBS with minor
changes and Bill Riley's unit. Comparison tests are ongoing to pick the
best. If Bill's shows better results I plan on laying one out using leaded
components. 2 channel and 4 channel counters are completed and are
Rex, let me check status and I will get back with you by Thursday. I am
presently finalizing a detailed outline of the total package.
Bert
In a message dated 12/10/2012 7:23:43 A.M. Eastern Standard Time,
r...@sonic.net writes:
Bert,
I have been waiting for more details to become
As Corby said oven control
Bert Kehren
In a message dated 12/11/2012 2:47:03 P.M. Eastern Standard Time,
p...@petelancashire.com writes:
Thanks
This weekend I'll stick a microphone inside a piece of tubing and go
looking.
The singing only occurs when the unit is in LOOP OPEN or OPER
Maybe some one with good Synergy connections can convince them that an
overseas time-nut can buy and pay but use an US time-nut for shipping that in
turn will forward it. I understand the cost involved for a Synergy because
of the paperwork, but I ship regularly oversees with USPS as some of
Brooks Shera has been a major contributor with his GPSDO. Before Tbolts
where affordable his QST article for the first time opened the door for many
amateurs to precision frequency at an affordable price. Over the years I
build many units. For a year I have tried to buy his latest version
Some how time nuts combined two lines it is
Karen Stoll46 Crazy Rabbit Rd Santa Fee, NM 87508
In a message dated 12/19/2012 3:55:33 P.M. Eastern Standard Time,
ewkeh...@aol.com writes:
Brooks Shera has been a major contributor with his GPSDO. Before Tbolts
where
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