Hi there,
Some time ago, I "hot rodded" the "tg" program that comes with the open
source "ntp" package and cleaned it up, making options for different
output formats, including IEEE 1344 extensions on the IRIG, and cleaned
up the WWV output for DST shifts, quality coding, etc.
When you posted you
First thing, clean the tin-plated board edge connectors and the
corresponding connectors on the motherboard. I always had to do that every
year or two to keep mine working. Squirt some cleaner on the spring
contacts and work the board up and down.
--
eric
On Tue, Feb 9, 2010 at 10:35 PM, Don Lat
I was told that there were a couple of adjustment pots that went bad; I
cannot remember which ones but they are in the feed from the receiver to the
digital control if that makes sense. I sold the one I had a year or so ago.
Don
- Original Message -
From: "Majdi S. Abbas"
To: "Discuss
On Tue, Feb 09, 2010 at 07:33:07PM -0800, Scott Burris wrote:
> Does anyone know if there are any > 5min recordings of WWV audio available?
> I'm trying to track down some problems with my Heathkit GC-1000 clock and
> it sure would be nice if I could inject some known good audio
> recording and see
> You're right, it's for a USRP. I just got annoyed with the
> constant frequency offset, so I'm rolling my own. Turns out there
> isn't much available for good off-the-shelf 64MHz VCXOs. The
> USRP2 has built-in support for 10MHz sync, but not having one,
> I'm left to what I do have. Can't injec
Suggestions:
1) Was it working before? If not you may need to follow the cell-flooding
correction procedure in the manual. Corby Dawson made an informative post
about that phenomenon a couple of years ago, if you can find it in the
archives.
2) If it was working but failed, check the +20V suppl
Feb 2010Circuit Cellar (now purchased by Elektor Magazine) has an article by Ed
Nisley on building a Totally Featureless Clock. Part 1 describes building a
WWVB Simulator. Guess I should build one to take to Dayton and leave as a
beacon? N0UU
___
t
You're right, it's for a USRP. I just got annoyed with the constant frequency
offset, so I'm rolling my own. Turns out there isn't much available for good
off-the-shelf 64MHz VCXOs. The USRP2 has built-in support for 10MHz sync, but
not having one, I'm left to what I do have. Can't injection lo
I have a 5065A that shows no PHOTO I or 2nd Harmonic. I am suspicious that
the Rubidium tube is the problem. There is voltage to the tube and I
measure no current from the tube directly. All other indications seem
normal. Does anyone have any experience trying to rejuvenate the Rubidium
tube fr
Hi Bob and all:
This is interesting, because I suspect this frequency source is for an
Ettus Research USRP. A little further downtimeline I will be faced with
this problem as well. The SDR is designed already and requires a 64 MHz
clock, especially as this clock is used for the microwave transmit a
Hello Raj,
using the trimble T'boltMON software:
Start with a "factory reset" in the control menu
follow previous guidance of enabling the "save position" capability,
Then to restart a survey
go to the control menu (on left),
select "restart self survey"
In lady Heather V3.0 beta of 21 Jan
Thanks Stan,
I did that but I can't where to "start the survey" in TBolt. In lady heather
there
is a key for it.
At 09-02-10, you wrote:
>Hello Raj,
>
>that location is probably where the coordinates were last saved. or there
>abouts
>Or those are the default factory settings from memory,
>
Thanks Bob,
I live in south India 13N 77E approx, self survey says 47N 172E .. this is way
off!
At 09-02-10, you wrote:
>Hi
>
>GPS altitude is a bit different than map altitude. There is a recent thread
>if you want all the details of why. Once you do the self survey, just accept
>what ever it c
Does anyone know if there are any > 5min recordings of WWV audio available?
I'm trying to track down some problems with my Heathkit GC-1000 clock and
it sure would be nice if I could inject some known good audio recording
and see if
the clock picks up the time from that.
I've found a couple rec
Hi
With most SDR's a spur on the clock creates a spur in the radio. No matter how
you do your multiply, you will wind up with some sub-harmonics running around.
Much better / easier / quicker to start at 64 or 65 MHz.
Bob
On Feb 9, 2010, at 8:32 PM, Bruce Griffiths wrote:
> Thats not very us
Thats not very useful when you want the 4th harmonic as its amplitude is
zero fro a 25% duty cycle.
Using a duty cycle of 1/8, 3/8 or 5/8 will maximise the amplitude of the
4th harmonic.
see:
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf
Bruce
Max Robinson wrote:
If you start with a square
A full wave rectified sinewave has only even harmonics present.
Bruce
Max Robinson wrote:
If you start with a square wave odd order is all you can get but if
you start with a pulse with a 25% duty cycle you can get even order.
It's best to optimize the pulse width for the harmonic you want.
If you start with a square wave odd order is all you can get but if you
start with a pulse with a 25% duty cycle you can get even order. It's best
to optimize the pulse width for the harmonic you want.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwi
If you must roll you own 64MHz crystal oscillator you can eliminate the
problems associated with parasitic oscillation in the sustaining
amplifier by using a low phase noise unconditionally stable MMIC (eg
ERA-5SM) as the sustaining stage.
A diode limiter in the feedback path that includes the
Murray Greenman wrote:
Now I realize I'm known as an injection locking fan, but here's my 2
cents worth:
Divide 10MHz by 5 to 2MHz using a Johnson ring counter (74HC4017). Use
that to injection lock a 64MHz XO. A low noise solution and no PLLs
required.
I'd not be surprised if you could injecti
IMHO it'd be best not to roll your own crystal oscillator unless you have
the equipment to measure its noise and other performance parameters, and the
time/skills/interest to optimize it. That's a tunnel in the rabbit hole
that will just take you away from the one you're headed down now. For a
on
Nick Foster wrote:
From: b...@iaxs.net
To: time-nuts@febo.com
Date: Tue, 9 Feb 2010 18:24:39 -0600
Subject: Re: [time-nuts] Low phase noise VCO
Which leads me to ask a novice question:
Why not pull a 16 MHz crystal and multiply to 64 MHz?
If you count down from 64 to 10 MHz, isn't the mult
Hi all;
Just an aside, after hearing dual rated Lorsta Dana for the last 25 years, it
is interesting to now hear a single rated chain. Rather than the syncopated
clatter of Dana, now just a smooth pitter! The east coast Canadian chain is
much weaker here in northern Indiana than Dana (about 125
Hi
Would 65 MHz work as well as 64? It certainly would be easier to come up with.
Bob
On Feb 9, 2010, at 6:41 PM, Nick Foster wrote:
>
> Gentlemen,
>
> Not being an oscillator guru, I thought I'd ask here. I'm building up a
> fixed-frequency 64MHz PLL oscillator which uses a 10MHz reference
Now I realize I'm known as an injection locking fan, but here's my 2
cents worth:
Divide 10MHz by 5 to 2MHz using a Johnson ring counter (74HC4017). Use
that to injection lock a 64MHz XO. A low noise solution and no PLLs
required.
I'd not be surprised if you could injection lock directly with 10M
> From: b...@iaxs.net
> To: time-nuts@febo.com
> Date: Tue, 9 Feb 2010 18:24:39 -0600
> Subject: Re: [time-nuts] Low phase noise VCO
>
> Which leads me to ask a novice question:
>
> Why not pull a 16 MHz crystal and multiply to 64 MHz?
>
> If you count down from 64 to 10 MHz, isn't the multipli
Hi
At 64 MHz you can go with a 3rd overtone crystal. If your temperature range is
modest, you can pull it further than you would ever need to.
You should be able to get good enough phase noise on the VCXO that you can use
a pretty narrow loop. That's good news, it lets you use an IC phase dete
> Does it need to be phase coherent with your 10MHz reference, or just
> frequency locked?
Doesn't need to be coherent right now, but I can think of several reasons why
having it phase coherent would be helpful in the future.
> Also, If you are using it in a software defined radio, you don'
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Nick Foster
> Sent: Tuesday, February 09, 2010 3:41 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] Low phase noise VCO
>
>
> Gentlemen,
>
> Not being an oscillator guru, I tho
Which leads me to ask a novice question:
Why not pull a 16 MHz crystal and multiply to 64 MHz?
If you count down from 64 to 10 MHz, isn't the multiplication inside the
PLL?
Perhaps the noise is multiplied by 4, but would it work for the intended
purpose?
Bill Hawkins
-Original Message---
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Nick Foster
> Sent: Tuesday, February 09, 2010 3:41 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] Low phase noise VCO
>
>
> Gentlemen,
>
> Not being an oscillator guru, I thou
Gentlemen,
Not being an oscillator guru, I thought I'd ask here. I'm building up a
fixed-frequency 64MHz PLL oscillator which uses a 10MHz reference. The
reference is a homebrew HP 10544A-based GPSDO which seems to work OK. I've
built a phase comparator based on a CoolRunner-II CPLD which impl
Hi
Was that an actual product or is it a one off?
We had similar stuff at Motorola when I started out. They were old even
then. The HP box seems to be one step past where the evolution of the
Motorola boxes died out.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-
found the thread :
"
[time-nuts] Lady Heather, heavy load for PC?
From: Mark Sims Add to Contacts
To: time-nuts@febo.com
With the later beta versions you can specify a /TW=# parameter on the command
line to force a periodic # milllisecond sleep. Try values
Was a thread about this a few months back, but I'm unable to find it. Program
was first written for dos and converted to windows this results in polled type
behavior vs interrupt / event behavior. A option to increase sleep time exist
but it does effect the mouse. Guess you could also lower it's
Mike wrote:
I note that Lady Heather keeps my CPU usage up at
around 40%-45% as long as it is running. When I close
LH my CPU usage falls to around 1% to 3%.
What are other LH users on the List seeing...?
Running LH3b on a 299 MHz PII with XP Pro, Control
Panels/Administrative Tools/Perform
Hi,
I just listed a HP K04 59991A frequency multiplier comparator on ebay
320486215475
Details in the listing but any questions welcome.
Corby Dawson
Small Business Tools
Compete with the big boys. Click here to find products to benef
Hi
GPS altitude is a bit different than map altitude. There is a recent thread
if you want all the details of why. Once you do the self survey, just accept
what ever it comes up with for altitude. If it's off by 100 meters, just
accept it and move on.
Bob
-Original Message-
From: time-nu
Thanks Stan,
Will do in first thing in the morning.
At 09-02-10, you wrote:
>Hello Raj,
>
>that location is probably where the coordinates were last saved. or there
>abouts
>Or those are the default factory settings from memory,
>and new coordinates were never saved.
>
>redo the survey and s
??? I double checked the email I sent and it seems part of it did not end
up in the time-nuts archive.
Perhaps it did pass on in the emails to subscribers. Personally I find the
traffic on this list a bit much and disabled the email/digest. Because of
my moving around I use some webmail thingy. So
Hello Raj,
that location is probably where the coordinates were last saved. or
there abouts
Or those are the default factory settings from memory,
and new coordinates were never saved.
redo the survey and save the results.
using T'boltMON V2.60 on a PC:
go to menu "set up", then "self s
Can someone point me to info that would clarify why my Tbolt's self
survey puts my house (AFAIK ~920M ASL, 13N 77.35E) in the Pacific ocean, south
of Vancouver and west of Seattle and about 10 meters under water. I am doing
something wrong for sure!
My sons iPhone gives me righ
Same with me, high usage on CPU and lower on the other. Average 50%. I cannot
resize the window. It either a small unreadable size or full screen.
Make it full screen, then do a ctrl-alt-del (bring up the task manager) then it
will minimize with low usage !!!
Raj
At 09-02-10, you wrote:
>Fell
Fellow Time-Nutters--
I note that Lady Heather keeps my CPU usage up at
around 40%-45% as long as it is running. When I close
LH my CPU usage falls to around 1% to 3%.
What are other LH users on the List seeing...?
Thanks!
Mike Baker
--
___
Hi
Efratom became part of Datum a while ago. They changed the marking on the
LPRO's after the ownership change.
Same product, just a new name on the door.
Bob
On Feb 9, 2010, at 7:28 AM, Joop wrote:
>> It is best to leave your stable quartz and Rubidium oscillators
>> running continuously,
>It is best to leave your stable quartz and Rubidium oscillators
>running continuously, preferably on a UPS in case of power failure,
>for best results.
>
>Best regards,
>
>Charles
>
I can understand. But I will not need that high accuracy very often.
So I just wanted to examine what can be exp
Hi
I suppose you could pull down weather data off of the internet. It might be
easier than it sounds. My guess is that it's actually more difficult than it
sounds
Bob
On Feb 8, 2010, at 10:44 PM, WarrenS wrote:
>
> Concerning WWVB from someone that used it way back to check my reference
47 matches
Mail list logo
