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I guess it depends on signal to noise ratio. With reciprocal counters, you
only need one period to measure as acurately as you need, but to have good
acuracy, you need very good S/N, as there is no filtering possible.
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Did mounting it on a block of foam help?
That is a rather bad solution. You want much softer material to react
to quicker things, such as silicon rubber. Also, that would only be a
12 dB/Oct solution. You would really like
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From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] FMT on October 13
Date: Tue, 25 Sep 2007 23:45:12 -0700
Message-ID: [EMAIL PROTECTED]
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I
propagation, fading and multipath.
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
Sent: Wednesday, September 26, 2007 1:45 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FMT on October 13
From: Didier Juges [EMAIL PROTECTED]
Subject: Re: [time-nuts] FMT on October 13
Date: Wed, 26 Sep 2007 05:57:14 -0500
Message-ID: [EMAIL PROTECTED]
Didier,
I just wanted to point out that with reciprocal counters, you can get
resolution much better than the 1Hz/s you would get
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Tom Van Baak said the following on 09/24/2007 08:57 PM:
I would think this is especially true for non-local frequencies,
such as one received over the air. I'll leave it to you FMT
guys to comment on the magnitude of
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Didier Juges said the following on 09/24/2007 09:40 PM:
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I guess it depends on signal to noise ratio. With reciprocal counters, you
only need one period
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While were at it, in the case mentioned above I'm a curious
about their FMT frequency standard -- if it's really accurate
to parts in 10^12, as they imply, over 10 minutes. I could
believe this if it were an Rb or Cs-based
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Make sure not to get near any of the equipment. Free-running
oscillators are sensitive to vibration or shock. You've probably heard
the story of my best Sulzer oscillator making small phase or jumps
which I eventually
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The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to
announce that the first annual MVUS Frequency Measuring Test will be
held on Saturday, October 13, 2007. There will be two transmission
periods: the first
Plans are to transmit two 10 minute test periods, and a third if the
transmitters aren't melting by that point.
Our goal is to transmit a signal known in frequency to parts in 10e-12
(i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar
level during the course of the
Plans are to transmit two 10 minute test periods, and a third if the
transmitters aren't melting by that point.
Our goal is to transmit a signal known in frequency to parts in 10e-12
(i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar
level during the course of the
measurement
Subject: Re: [time-nuts] FMT on October 13
Plans are to transmit two 10 minute test periods, and a
third if the
transmitters aren't melting by that point.
Our goal is to transmit a signal known in frequency to
parts in 10e-12
(i.e., less than 0.0001 Hz error at 10 MHz
Didier Juges wrote:
I guess it depends on signal to noise ratio. With reciprocal counters, you
only need one period to measure as acurately as you need, but to have good
acuracy, you need very good S/N, as there is no filtering possible.
For example, the HP 5370 can measure a single period
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