Isn¹t Inmarsat in a Clarke Orbit? If the propagation path for the solar
eclipse shadow experiment runs through the eclipse with the path from Clarke
orbit to you, then there's tons of signals available to look at.
On 6/28/09 10:48 PM, Lester Veenstra m0...@veenstras.com wrote:
INMARSATS
My solution is to lock a 1GHZ Crystek resonator
to 10MHz, and then use this to drive a DDS AD9912.
Recent generations of DDS are quite impressive.
http://www.qslnet.de/member/on4iy/9912.html
Xtof.
Murray Greenman wrote:
Here's an idea which actually works (I tried it). Rather than lock at
Both for locking with a 10MHz or 1pps you have a
single chip solution using one of my reflock designs.
http://w3ref.cfn.ist.utl.pt/cupido/reflock.html
For a 1pps lock of fractional 1/3 frequencies you have
already a code. (check the list of files for reflock 1)
For locking a 66.666(6) VCXO to
Hi Luis,
Are kits available again for your design?
73's
Nic
VK2KXN / VK5ZAT
Subject: Re: [time-nuts] GPSDO project - 66.667MHz from 10MHz
Both for locking with a 10MHz or 1pps you have a
single chip solution using one of my reflock designs.
http://w3ref.cfn.ist.utl.pt/cupido/reflock.html
For
Nic,
I think yes but I'm not sure, please check
Darrel's VE1ALQ and NTMS(Kent Britain) for
reflock I pcb's and/or kits (as I've not heard
from them recently).
I believe TAPR is no longer offering the
reflock II kit :-(
Luis Cupido
ct1dmk.
Nic McLean wrote:
Hi Luis,
Are kits available again
Hi Mark,
I should have red the instructions better, it does work as wanted -
great, thank you!
Hello Arnold,
That feature is already in the current release (v 2.0). You can use the 'w'
keyboard command to write the data to a file. You can select either the
complete buffer or just the time
Hello.
I have received a Patek Phillipe's Telequartz master clock . This device can
distribute 1 minute 24 V pulses to control several clocks. It also can
receive a radio signal to synchronise the local time scale.
Unfortunately I did not receive a copy of the manual. I will appreciate if
any of
Many thanks to all who responded to my request for help on this project.
The SDR-IQ (http://www.rfspace.com/SDR-IQ.html) already has a built-in
66.6667 MHz osc, I just want to make it more stable and reasonably
accurate, as I use it as a general coverage HF receiver with a one-
Hertz
Consider a 2nd hand low phase noise source like a
PTS-160.
Best regards,
Xtof.
Brad Dye wrote:
Many thanks to all who responded to my request for help on this project.
The SDR-IQ (http://www.rfspace.com/SDR-IQ.html) already has a built-in
66.6667 MHz osc, I just want to make it more stable
Hi Brad.
Just catching up with this, after a hot weekend, and doing White Van
Man impressions on (an even hotter) M1 this morning...
Personally, I wouldn't bother with any high accuracy clock/oscillator
for the SDR, unless you can also synch the AD sampling clock in the
soundcard. As that will
James:
I am afraid you lost me; can you illuminate (NPI) us on what the
experiment is. Is this a leo satellite with an L-Band downlink?
Les
Lester B Veenstra MØYCM K1YCM
les...@veenstras.com
m0...@veenstras.com
k1...@veenstras.com
-Original Message-
From: Lux, James P
-Original Message-
From: Lester Veenstra [mailto:m0...@veenstras.com]
Sent: Monday, June 29, 2009 11:22 AM
To: Lux, James P; les...@veenstras.com; 'Discussion of
precise timeand frequency measurement'
Subject: RE: [time-nuts] Orbiting crystals
James:
I am afraid you lost me;
Now this begins to make some sense;
Of course the geosync satellites do go into eclipse season trice a year,
during which each day the satellite is passing through the Earth's shadow
for a variable period.
To pass though the shadow of a solar lunar eclipse, the eclipse would have
to be
Lester Veenstra wrote:
Now this begins to make some sense;
Of course the geosync satellites do go into eclipse season trice a year,
during which each day the satellite is passing through the Earth's shadow
for a variable period.
To pass though the shadow of a solar lunar eclipse, the
Sorry, but no such luck on the commercial satcoms.
Lester B Veenstra MØYCM K1YCM
les...@veenstras.com
m0...@veenstras.com
k1...@veenstras.com
-Original Message-
It was assumed that the crystals was locked to Cesium or Rubidium, and
hence it would chase up the
Lester Veenstra wrote:
Sorry, but no such luck on the commercial satcoms.
It was a mear assumption, not a requirement. A pure crystal solution
would do fine, as the goal was really to measure if the effect is real.
The IGS network have already done this, and published the results, and
they
Does anyone have a Reflock that they would sell me?
Best regards,
Brad Dye
K9IQYom
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Dave Baxter wrote:
Personally, I wouldn't bother with any high accuracy clock/oscillator
for the SDR, unless you can also synch the AD sampling clock in the
soundcard.
The SDR-IQ, SDR-14, Qs1r, Perseus and the HPSDR project do not rely on a sound
card ADC to sample any signals.
The RF
Hello Brad,
VE1ALQ has them. He will also make VCXO's. Do a google search for his
webpages.
He sells the kits as well as the assembled units.
By far easier to get a PTS or Fluke sysnthesizer.
Stan, W1LE
Brad Dye wrote:
Does anyone have a Reflock that they would sell me?
Best regards,
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