While I have not done this yet, there is supposedly software that allows
direct sampling down to DC.
Some of the devices have a hole in the coverage around 1200 MHz so watch
out. I think the RTL2832 is ok though.
Tom
- Original Message -
From: Bob Stewart b...@evoria.net
To:
You can double it very easily. Feed it into a full wave bridge and you will
get 10 MHz.
Amplify and filter as desired.
Regards,
Tom
- Original Message -
From: Euclides Chuma eucli...@w2c.com.br
To: time-nuts@febo.com
Sent: Friday, August 02, 2013 2:40 PM
Subject: Re: [time-nuts] 5MHz
You can't use efficient antenna and 100 kHz in the same sentence. Oh,
wait...
- Original Message -
From: J. Forster j...@quikus.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, July 28, 2013 3:06 PM
Subject: Re: [time-nuts] GPS Spoofing
That is why they use litz wire, sometimes three inches in diameter for the
coils and for the capacity hat.
The ground system includes miles of buried copper. Capacitors are larger
than trash cans and gas filled.
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of
You might generate a CW RF test signal at a level that allows easy detection
on the SA. Maybe into a simple dipole antenna. A second dipole test antenna
could establish a reference that you could relate the GPS antenna gain to.
Tom
- Original Message -
From: Mark C. Stephens
I have an old Keithley 602 meter that uses a single Hg cell for the ohm
meter function. There are not many alternatives that matched the stability
of the mercury cells.
I don't see why they could not just put a core charge on the cells that
would make it desirable to recycle them. Or require
I wonder if that would be possible? I bet the government paperwork would
make the watches costs far out of reach for most people.
Tom
WA3PZI
- Original Message -
From: Bob Stewart b...@evoria.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent:
I wonder what that is? How come the digits don't show the same burn that the
hands do? They certainly remained in the same position for longer than the
hands.
Hmmm?
Tom
- Original Message -
From: Chuck Harris cfhar...@erols.com
To: Discussion of precise time and frequency
It's probably a software bug in the NSA monitoring system that keeps
dropping some of the message content.
:)
- Original Message -
From: ed breya e...@telight.com
To: time-nuts@febo.com
Sent: Sunday, June 30, 2013 3:05 PM
Subject: Re: [time-nuts] wwvb 60 khz tuning fork crystals
Maybe it was a 2 mm pitch, a somewhat common size. Others that come to mind
are 0.125 and 0.156 inches.
Tom
- Original Message -
From: Bob Stewart b...@evoria.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, June 25, 2013 10:03 AM
I wonder what the actual distance is using current GPS survey processes?
Tom
- Original Message -
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Monday, June 24, 2013 9:02 PM
Subject: Re: [time-nuts] Measuring speed of light or reproducing a metre
On 6/24/13 4:16
2.54 mm is exactly 0.1 inch.
Tom
- Original Message -
From: Don Latham d...@montana.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and
frequency measurement time-nuts@febo.com
Sent: Tuesday, June 25, 2013 12:37 AM
Subject: Re: [time-nuts] OT Prototype Boards
2.54
MSE reports the two .exe files as unsafe and contains a virus. Does anyone
else see the same thing?
Regards
- Original Message -
From: Mark C. Stephens ma...@non-stop.com.au
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, June 22, 2013
Hey, it could take the place of WWVB. Put it on 600 kHz. Then all you need
is a simple divide by 10.
TIC,
Tom
- Original Message -
From: Magnus Danielson mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Friday, June 21, 2013 11:04 PM
Subject: Re: [time-nuts] Oscillator
Can you show some pictures of the oscillator? Is there a tunable inductor in
the oscillator circuit?
Who makes the unit?
The FCC specification for AM broadcast transmitters is +/- 20 Hz.
Regards,
Tom
- Original Message -
From: Joseph Gray jg...@zianet.com
To: Discussion of precise
That's criminal!
Tom
- Original Message -
From: J. Forster j...@quikus.com
To: n...@verizon.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Monday, June 17, 2013 12:43 PM
Subject: Re: [time-nuts] HP and other equipment failure
An Audiophool and his
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, June 02, 2013 3:16 PM
Subject: Re: [time-nuts] Cheap 9.8Mhz Sa.22c's
What are you planning to do with the 10MHz signal. In
It is now www.artekmanuals.com
But I fully agree. This is a great resource if you are in to the legacy test
equipment.
Regards,
Tom
- Original Message -
From: J. Forster j...@quikus.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday,
It looks more like a HP serial number.
Tom
- Original Message -
From: Brooke Clarke bro...@pacific.net
To: time-nuts@febo.com
Sent: Thursday, April 18, 2013 5:41 PM
Subject: [time-nuts] Z3805A OCXO p/n 3505A09422?
Hi:
I'm trying to learn more about the HP Z3805A GPSDO.
You might take a look at these:
http://www.ebay.com/itm/360601919160?ssPageName=STRK:MEWNX:IT_trksid=p3984.m1497.l2649#ht_780wt_911
They have a fiber terminated Avalanche PD and built in HV supply from 5
volts. Cheap at $5 each.
Tom
- Original Message -
From: J. Forster
Exothermic welding (Cadweld) is the usual method for attaching the down lead
to the clad ground rod.
Regards.
Tom
- Original Message -
From: Don Latham d...@montana.com
To: mafl...@theflynn.org; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday,
Actually max power is around 30 ohms. Fifty ohms was a compromise.
Here is a good paper on coax design.
Just for another data point. I have a new LaCrosse digital clock that uses
the 60kHz WWVB signal to keep time. It is the model WT-8005U-B, shown here.
http://www.lacrossetechnology.com/8005b/index.php It has at least three
times in the last two months jumped time. Twice by an hour and once by
I picked up two of these units and they were a very good deal. Don, thanks
for finding and reporting them. I wish I had picked up a few more of them.
Inside, there is a four output switching supply with +/-12 and +/-5 volts.
If it were possible to cut away some of the main board that includes
You can buy it for $8 COTS.
You clean up the QRS waveform with a one-shot then integrate to get rate.
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, February 19, 2013 8:23 PM
Subject: Re:
It is possible to open the can if you are careful. A good vacuum desoldering
tool is a good start to remove as much of the solder as possible. Then one
would peal the can open a bit at a time. Then you need to find out where the
failure is.
But to answer your question, yes just buy one, it's
You'll never pull a crystal that far without grinding :).
Regards,
Tom
- Original Message -
From: Ed Breya e...@telight.com
To: time-nuts@febo.com
Sent: Thursday, January 17, 2013 6:38 PM
Subject: [time-nuts] How far can I push a crystal?
I've got to make a very clean 10.0594...
Isn't there a fast divide by N counter that you could set to 10? Maybe even
in ECL?
- Original Message -
From: David davidwh...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, January 03, 2013 8:49 PM
Subject: Re: [time-nuts] 10
Thanks David. That's good to know. It's an interesting display.
Regards,
Tom
- Original Message -
From: David Martin drmar...@ivietechnologies.com
To: time-nuts@febo.com
Sent: Friday, December 21, 2012 1:41 PM
Subject: [time-nuts] How it was Done - A Day in the Life of Five
Google baker clamp for more on this.
Tom
- Original Message -
From: Alan Melia alan.me...@btinternet.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, December 22, 2012 6:28 PM
Subject: Re: [time-nuts] Questions about TAC frontend, and
How did he set up the video? What camera?
Sorry, I lost the original message.
Regards,
Tom
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, December 20, 2012 9:55 AM
Subject: Re:
You might try doing a cold reset. I had the same issue and that got it back.
You need to use the trimble software.
Tom
- Original Message -
From: David Garnier dgarn...@wi.rr.com
To: time-nuts@febo.com
Sent: Tuesday, December 11, 2012 5:27 PM
Subject: [time-nuts] Thunderbolt
Hi Sarah,
The temperature you are seeing is that of a Dallas IC mounted on the main PC
board. You are seeing the ambient temp of the board, not inside the OCXO
oven.
Regards,
Tom
- Original Message -
From: Sarah White kuze...@gmail.com
To: Discussion of precise time and frequency
Some of the HP OCXOs (the one in the HP856x SA) have a oven ready signal.
That could be used to force the switch. Some Rubidium standards (FEI
FE-5680A for sure) have a locked indicator that could do this function.
I think you could mute the 10 MHz where it is fed to the instrument and that
Hi Bob,
Can you give a good definition of retrace as it applies here?
Thanks,
Tom
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, December 09, 2012 7:24 PM
Subject: Re: [time-nuts] Switching
of thing.
Since none of this is tightly defined, you will see various specs looking at
the same issues a bit differently. Often those differences roll up to some
sort of system requirement.
Bob
On Dec 9, 2012, at 7:45 PM, Tom Miller tmil...@skylinenet.net wrote:
Hi Bob,
Can you give
.
Bob
On Dec 9, 2012, at 8:47 PM, Tom Miller tmil...@skylinenet.net wrote:
So if I understand it, you allow the OCXO several days of warm-up to set
the frequency. Then when turned off for a while, then restarted. After
some warm-up period, the retrace spec would give an indication of how
close
And then it becomes popular and guess what happens to the price?
Tom
- Original Message -
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Friday, December 07, 2012 12:15 PM
Subject: Re: [time-nuts] GPSDO Alternatives
Maybe a patent search is in order.
- Original Message -
From: Mike Garvey r3m...@verizon.net
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Friday, November 30, 2012 3:24 PM
Subject: Re: [time-nuts] Loran
Might be these guys; this abstract is
I made an offer of 14 pounds each for two of them that was accepted.
I wonder what the temperature it runs at is? maybe put it inside another
oven that uses a PTC heater.
Tom
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency
Oh my, that looks like a good deal. I'll have to order a few.
Regards,
Tom
- Original Message -
From: cdel...@juno.com
To: time-nuts@febo.com
Sent: Thursday, October 25, 2012 3:59 PM
Subject: [time-nuts] SR620 VCTCXO replacement
Hi,
Check this one out! I think it might work as
Hello Paul,
I guess you tested it at 57 kHz? Were you able to get it to work with your
simulator at the normal frequency?
Does anyone have details on the test mode?
I just picked up $3 worth.
Regards,
Tom
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, October 22, 2012 8:35 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
To switch
If you let the water boil, it takes even (much) less.
Tom
- Original Message -
From: J. Forster j...@quikus.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, October 03, 2012 8:14 PM
Subject: Re: [time-nuts] OT question about liquid
It also says output power +10 dBm.
3 hour Li battery life.
Only for legal use :)
Much does not make sense with this.
Forward a copy to the commission?
Regards
- Original Message -
From: J. Forster j...@quikus.com
To: Discussion of precise time and frequency measurement
We don't know that they modulate the jamming signal some what. I bet 10 mW
would do a good bit of harm to GPS systems even a block away.
- Original Message -
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Tuesday, October 02, 2012 10:45 PM
Subject: Re: [time-nuts]
Under other issues, I have one where GPS could not be used. It was at a UHF
TV station where the third harmonic fell right in the L1 band. A 220,000
watt UHF transmitter driving a gain antenna for 5 MW EIRP will always
produce some third harmonic near the antenna. There was no access to GPS
See:
http://www.nist.gov/calibrations/upload/1424.pdf
Re. GPS traceable to NIST.
- Original Message -
From: Burt I. Weiner b...@att.net
To: time-nuts@febo.com
Sent: Wednesday, September 26, 2012 11:49 AM
Subject: [time-nuts] New WWVB format...
I'm sure most of this group has seen
Class action suit anyone?
- Original Message -
From: J. Forster j...@quikus.com
To: time-nuts@febo.com
Sent: Wednesday, September 26, 2012 12:46 PM
Subject: [time-nuts] WWVB Now a Monopoly
I just received this in reply to a query ablot the availability of
receiver designs for the new
If the company that developed the format has a lead on tying up the IP for
marketing the new format so that others cannot play, then yes, there is a
problem. Really!
- Original Message -
From: Poul-Henning Kamp p...@phk.freebsd.dk
To: Discussion of precise time and frequency
With all due respect;
What I dislike is the pre-entry of a company that has direct knowledge of
the format, tying up the easy (and less expensive) methods of decoding the
time data using prior inside information and the patent system.
Let's say you find out what this PM modulation format is
That's because the signs are scanned/multiplexed displays. It is not 60/120
Hz flicker.
Tom
- Original Message -
From: Ryan Szekeres ryan.szeke...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, September 18, 2012 3:38 PM
Subject:
Will this be able to discipline a rubidium oscillator as well as a OCXO?
Maybe you could switch in a divider network to close in the trim range as
the oscillator precision improves.
Hope someone makes a PC board available. Count me in for some.
- Original Message -
From: Azelio
- Original Message -
From: li...@lazygranch.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, September 11, 2012 4:42 PM
Subject: Re: [time-nuts] Be aware of test equipment seller
orzel-enterprisesoneBay
Ebay fees don't reflect shipping
For me, the link does not work. About a month ago I received a 8566B with
both the handles broken off. So I feel your pain. It was packed in a box
filled with foam peanuts.
- Original Message -
From: David Kirkby david.kir...@onetel.net
To: Discussion of precise time and frequency
I also read the mishap book and remembered recently seeing this news
story.
http://news.yahoo.com/air-france-flight-447-crash-didnt-happen-expert-162449729--abc-news-topstories.html?bcmt_s=m#ugccmt-container
Seems some lessons are never learned.
- Original Message -
From: gary
I have one of the atomic clocks that sets itself via WWVB to keep time.
Yesterday, Tuesday, AM it was an hour fast. Today it went back an hour to
the correct time.
Strange.
Tom
- Original Message -
From: KD0GLS kd0...@mninter.net
To: Discussion of precise time and frequency
You can see it easily with any 50+ MHz analog scope that has a working DC
trigger function.
If it is a 1 us pulse width TTL output or close, set the H sweep to 1
us/div, The vertical to 1 volt/div, the triggering to normal, and the
trigger input to DC. Then adjust the trigger point to +1
No it is not.
VA * PF = W for VA = volt amps, PF = power factor, W = watts (or true power)
PF = the cos of the phase angle between the current and the voltage
(assuming both are sine waves)
+
Peak Volts * 0.707 = RMS volts, again for sine waves only.
+
- Original
Cosine of the phase angle is the power factor, a number between 0 and 1
But only for sine waves.
- Original Message -
From: jmfranke jmfra...@cox.net
To: Time-Nuts time-nuts@febo.com
Sent: Sunday, August 19, 2012 3:36 PM
Subject: Re: [time-nuts] Modern motherboard with RS232 port
Can you open them up and see how they are made and what they use for the
gain device?
Take lots of pictures :)
- Original Message -
From: Chuck Harris cfhar...@erols.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, July 30, 2012 4:07 PM
Put a capacitor across the diode. 0.01 uF should be fine.
- Original Message -
From: li...@lazygranch.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, July 30, 2012 7:58 PM
Subject: Re: [time-nuts] Active antennas for a Thunderbolt...
Hi Bob,
Did you look at his pictures of the oscillator? I think the base will need
to be secured and the top pulled off. This is different from most of the
OCXOs I have seen.
Regards,
Tom
- Original Message -
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and
@febo.com
Sent: Thursday, July 26, 2012 2:20 PM
Subject: Re: [time-nuts] 5MHz ocxo- Opening Solder sealed cans
On 26/07/12 17:49, Tom Miller wrote:
Hi Bob,
Did you look at his pictures of the oscillator? I think the base will
need to be secured and the top pulled off. This is different from most
and frequency measurement
Subject: Re: [time-nuts] 5MHz ocxo- Opening Solder sealed cans
On 26/07/12 20:49, Tom Miller wrote:
Pick up a few sticks of ChipQuik and mix it in with a good iron. Then,
you may do just what you say. It should melt below about 95°C.
A good hot air heat gun would most likely do
Can you post up a few pictures of the oscillator?
There have been people that have opened these up and repaired them. If you
feel not up to it, why not see if someone on this group can help.
Repairing it will eliminate a lot of searching.
Tom
- Original Message -
From: Paul
I have an original that I could send to Dave at Artek for scanning. I don't
see it on his site.
I don't know what he will charge but usually it's very reasonable.
Regards,
Tom
- Original Message -
From: Tom Miller tmil...@skylinenet.net
To: Discussion of precise time and frequency
Make up an adapter board with the divide by two under the Morion oscillator.
Make the correct pin out on the board.
Those units are very nice for the money. You might get a bad one though.
They have an issue with a SMT capacitor on many of them. But again, many
have opened them up for repair.
You might try to use some chip-quik alloy. It greatly lowers the melting
point of the solder.
http://www.chipquikinc.com/
Their flux is very good also.
- Original Message -
From: Richard W. Solomon w1...@earthlink.net
To: Discussion of precise time and frequency measurement
I think you need a space before the /2.
C:\Program Files\Heather\heather.exe /2
But I could be wrong.
Tom
- Original Message -
From: Bud Patten bud.pat...@frontiernet.net
To: time-nuts@febo.com
Sent: Monday, July 23, 2012 6:00 PM
Subject: [time-nuts] Heather Problem..
I'm having
at the bottom. 24kHz is VLF.
Didier KO4BB
Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 07/16/2012 03:28 AM, Tom Miller wrote:
I believe they called that system a bell ringer. It let the sub
know
that it had to come close to the surface to receive new information.
I'll need
at the bottom. 24kHz is VLF.
Didier KO4BB
Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 07/16/2012 03:28 AM, Tom Miller wrote:
I believe they called that system a bell ringer. It let the sub
know
that it had to come close to the surface to receive new information.
I'll need to google around
I believe many of the GWEN sites were converted to VLF beacons transmitting
differential GPS reference data.
I know of one site in Crownsville, Maryland that does just that.
I don't know the up to data status of these sites now.
Regards,
Tom
- Original Message -
From: jmfranke
I believe they called that system a bell ringer. It let the sub know that
it had to come close to the surface to receive new information. I'll need to
google around to find more about it.
We had a ELF transmitter (NSS) in Annapolis that transmitted about 1 MW at
about 24 kHz. Anyone ever seen
They lie anyway.
Hope you get your power back and not lose it again tonight.
Regards,
Tom
- Original Message -
From: Brian, WA1ZMS wa1...@att.net
To: Time-Nuts time-nuts@febo.com
Sent: Sunday, July 08, 2012 4:50 PM
Subject: [time-nuts] [OT]: HP-5061A and a dust bunny.
BTW….All
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, July 07, 2012 11:30 AM
Subject: Re: [time-nuts] HP 117/10509a...
Pretty sure NIST will not do anything. Just to set expectations.
We
I read somewhere that NiMH batteries do not like float charging. You might
do some research on that.
What I do is disable the charge circuit and install a Tadiran Li 3.6 volt
cell. You keep the diode to isolate the Li cell from the normal 5 volts.
These things will last 20 years and they
You should be able to get the power for a OCXO way down with some very good
insulation. Think Dewar container for the XTAL and heater. They just need a
lot of power to get warmed up and you could do that prior to installation.
As to using a choke ring antenna, just use a steep peaked radome.
Where are you located? Maybe someone else could share the trip cost.
Regards,
Tom
- Original Message -
From: Peter Gottlieb n...@verizon.net
To: time-nuts@febo.com
Sent: Wednesday, April 18, 2012 11:41 AM
Subject: Re: [time-nuts] time-nuts Digest, Vol 93, Issue 96
I've found it
- Original Message -
From: gary li...@lazygranch.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, April 16, 2012 7:43 PM
Subject: Re: [time-nuts] Chinese Scopes
That simply is not the case with the Rigol scope. I was able to use it
--
Message: 2
Date: Wed, 08 Feb 2012 22:15:41 -0600
From: Scott Newell newell+timen...@n5tnl.com
To: time-nuts@febo.com
Subject: [time-nuts] Morion MV89 output level?
Message-ID: mailman.980.1328767168.1783.time-n...@febo.com
Content-Type: text/plain;
There is no particular advantage in one or the other, at least not
for most applications. It's tradition that measurement and (most) RF
gear uses 50R, while TV and radio uses 75R. (there was once a reason
for this, but i don't know it).
FYI,
The reason there are two primary impedance's in
Hello Group,
I have been lurking for a while to get a feel for the group and hope to give
back
something in return for all the good information found so far.
I have two of the FE-5680A units from the usual source. They both worked and
were much less than 1 Hz off compared to a Trak Microwave
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