On a visit to NIST Boulder (then known as NBS) many years ago (1978), I was
presented with a copy of NBS Monograph 155, "From Sundials to Atomic
Clocks" by one of the authors. I found it to be a fantastic read, it
answers all of those questions about Time & Frequency that you were afraid
to as
A couple of details that might help you avoid confusion in next weeks ARRL FMT;
1.) The CW ID transmissions will be on the carrier frequency.
2.) Tone transmissions will be on the Lower Side Band.
-Mike-
WA6ZTY
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The ARRL Summer FMT will be held on July 1.
See attachment for details.
-Mike-
WA6ZTY
FMT Announcement - 1 July 2009.pdf
Description: Adobe PDF document
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- Original Message ----- From: "Mike Fahmie"
To: "Discussion of precise time and frequency measurement"
Sent: Wednesday, May 06, 2009 3:12 PM
Subject: Re: [time-nu
The HP117 manual cautions you to keep the antenna far away from the
receiver for just that reason!
Take a good look at the electrolytics, even the tantalums in the shielded
box. I had to replace most of them.
-Mike-
WA6ZTY
At 07:36 PM 5/4/2009, you wrote:
When someone posted the message abo
At 03:27 PM 2/19/2008, you wrote:
>Mike Fahmie wrote:
> > Somewhere, I have a NASA pub that describes a technique using Gamma Rays
> > to
> > accelerate aging so that later aging is much reduced, can't seem to find
> > it
> > now. I would guess that th
Aging is a composite of phenomena sometimes resulting in a negative rate
and sometimes in a positive rate (most common). Some causes that haven't
been mentioned in this thread are the slow release of stress in the
crystalline structure created by shock or temperature excursion, and the
diffusio
The Wenzel article mentions that care was taken to minimize power supply
noise and HEATER NOISE. I had never considered the effect of the magnetic
field from the heater winding coupling into the oscillator circuitry.
Fortunately (aka luckily), I had always wound my heater coils with 2
conductor
At 06:02 AM 11/27/2007, you wrote:
>You will need a clock shaper to convert the sine to a digital signal, and
>a series of dividers.
>
>You can look at my page on clock shapers for ideas:
>
>http://www.ko4bb.com/Timing/ClockShaper.html
>
>If you look through the archives, I believe earlier this ye
My guess is that it is a converter that allows a fixed 10 MHz receiver to
receive a range of other frequencies. I can't quite read the tuning dial to
see just what range it covers.
-mike-
At 05:19 PM 4/3/2007, you wrote:
> > What is it?
> >
> http://www.gmat.unsw.edu.au/currentstudents/ug/proje
>
>When you get to the sub-100 ns level UTC is not GPS. And
>UTC(NIST) isn't UTC(USNO). Even the national labs don't
>agree down to the last ns.
>
>/tvb
Remember that no one lab has the true UTC clock. UTC is an offset to Atomic
Time (TAI), and TAI is the weighted average of hundreds of clocks i
At 07:05 AM 3/7/2007, you wrote:
>Mike Fahmie wrote:
> > 2006 FMT results have appeared at:
> >
> > http://www.arrl.org/w1aw/fmt/2006/2006-fmt-results.html
> >
>
>It is curious that none of us managed to be within 1 Hz on 3 bands. I
>missed out by 1.4 Hz on 40M
I think I traced the circuit out by hand many years ago. I'll see if I can
find it. Ping on me if you don't hear back in a few days. If 25 MHz is the
broken band, don't worry, they don't transmit there anymore. :-)
-Mike-
At 11:47 AM 3/6/2007, you wrote:
>Mike Fah
2006 FMT results have appeared at:
http://www.arrl.org/w1aw/fmt/2006/2006-fmt-results.html
-Mike-
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At 03:50 PM 2/21/2007, you wrote:
>At 02:57 PM 2/21/2007, you wrote:
> >I have an SR620 counter that I set up with a Z3801A as an external
> >reference. If I put a bnc T connector at the output of the Z3801A and use
> >two equal length bnc cables, one to the ext. ref input on the back and the
> >o
At 02:57 PM 2/21/2007, you wrote:
>I have an SR620 counter that I set up with a Z3801A as an external
>reference. If I put a bnc T connector at the output of the Z3801A and use
>two equal length bnc cables, one to the ext. ref input on the back and the
>other to channel A then do a frequency me
Hello to all, I just stumbled onto the group while "Googling" for FMT
stuff. My call is WA6ZTY and had my 15 minutes of fame as the west coast
outlet for this years FMT. I am an ENR (engineer nearing retirement) at the
Lawrence Berkeley National Lab. where I work with very big power supplies
an
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