On Tue, Apr 21, 2015 at 1:23 PM, Bob Camp kb...@n1k.org wrote:
Hi
inevitably on these devices, there is a marketing brochure that hits the high
points
in the specification. That information is public and intended to get “buzz”
going on
the product. Once an OEM gets serious about the
A week is somewhat optimistic since the thunderbolt consumes around 1.68
kilowatt hours of energy. With a 12V battery a capacity of around 84 ampere
hours (for an efficiency of 100%) which is somewhat larger than that provided
for most UPS particularly those sold for use with personal
during the last days i ran a few tests with different high stability
options.
setup:
channel 1: thunderbolt 10 mhz divided down to 1 pps
channel 2: trimble 73090 DOCXO 10 MHz divided down to 1 pps. frequency
offset about 7e-9
internal time bases: no additional time base; morion mv89a; trimble
Hi
Backing up a bit to “getting a TBolt running”.
1) instal Lady Heather and get it connected to the TBolt
2) does it fire up and find any sats?
3) are the power supplies holding regulation?
4) nail down the antenna in the best fixed location you can find
5) run the auto-calibration feature in
On Wed, Apr 22, 2015 at 1:47 PM, Bob Camp kb...@n1k.org wrote:
Hi
Backing up a bit to “getting a TBolt running”.
1) instal Lady Heather and get it connected to the TBolt
2) does it fire up and find any sats?
Yes. It had been working consistently for several days prior to my
first message.
Hi All,
I'm searching for the less expensive signal analyzer to perform phase noise
measurements on OCXO's. There is no need to go above 400 MHz - 1 GHz. I'm
particularly interested on low frequency offset and good close in phase noise
specs. Any recommendations?
Best regards,
Vasco
Hi,
In all reality, achieving these results without decades of experience is
probably unlikely. That said, are the specific plans available or
published anywhere? Is is possible that someone willing to build and
tinker could make a 'functional' copy of this unit?
I would guess that not all
On Tue, Apr 21, 2015 at 1:30 AM, Pete Stephenson p...@heypete.com wrote:
On Tue, Apr 21, 2015 at 4:25 AM, Charles Steinmetz
Indeed. I'm running a 48-hour survey with Lady Heather now to see if
that can improve things a bit more.
You can let the GPS receiver do a self-survey but you can also
On a Thunderbolt, you can only manually enter your position with using
single-precision floating point numbers... not really accurate enough for a
time-nut. When Lady Heather does a precision survey, it stores the
high-prescision results of the 48-hour survey by doing repeated single-point
Hi Pete,
I am a little confused. In your screen shot the overdetermined clock
says you are at precisely 46.00 North by 7.0 East at 547
Meters. However, Google Earth shows that location at over 10 thousnad
feet (3100 meters) elevation in a remote part of the Switzerland
mountains.
A couple of thinks to note:
Before running the auto-calibration feature, first set the antenna elevation
mask angle to a low value and let it run for a few (say 12) hours. This will
collect data on the received signal strength vs satellite elevation angle. The
auto-calibration routine sets
You might like the SignalHound:
http://signalhound.com/
Don
Vasco Soares
Hi All,
I'm searching for the less expensive signal analyzer to perform phase noise
measurements on OCXO's. There is no need to go above 400 MHz - 1 GHz. I'm
particularly interested on low frequency offset and good
Hi
Is this for a business or for a basement?
Are you looking for new self contained gear or combinations of used gear?
Is a cross comparison device ok or do you need a stand alone device?
How low do you need to go how fast? Is -190 dbc/ Hz low enough? Is a 24 hour
run to long?
Lots of
I'm searching for the less expensive signal analyzer to perform phase noise
measurements on OCXO's. There is no need to go above 400 MHz - 1 GHz. I'm
particularly interested on low frequency offset and good close in phase noise
specs. Any recommendations?
Tough to say without a budget range.
Hi
I suspect that the “more alarming” signatures on the stable sources are a
function of them
“holding still” (in phase) longer. With the less stable sources, the junk is
still there, it
just is smeared out more.
Bob
On Apr 22, 2015, at 6:17 AM, Hans Holzach hans.holz...@gmail.com wrote:
Hi
Looking at that screen shot, something is *very* wrong with your GPS reception.
Your GPS
is 10X worse than it should be.
On Apr 22, 2015, at 9:37 AM, Pete Stephenson p...@heypete.com wrote:
On Wed, Apr 22, 2015 at 1:47 PM, Bob Camp kb...@n1k.org wrote:
Hi
Backing up a bit to
I've been away for a long time. So, I guess that makes me the new guy, all
over again.
I have long coveted a choke ring GPS antenna. Oh, I have several so called
timing grade ones but I have always wanted a choke ring. After watching
them on eBay for a long time and seeing them in the $600 range,
Hi
Gee… I wonder who got the other one ….:)
They are big beasts and are both heavy and a wind load. Both need to be
taken into account when mounting them. They most certainly do have preamps
in them. Often the preamps do not work down at the 5V that a 3801 puts out.
The gain of the antenna may
Hi
In some ways this is like:
I can buy tubes of paint and some brushes down at Hobby Lobby.
That’s what I need to paint the next Mona Lisa.
While that’s all quite true, it’s not the whole story :)
There’s an enormous amount of training and experience that goes into fitting
this
sort of
wb6bnq wrote:
“I am a little confused. In your screen shot the overdetermined clock
says you are at precisely 46.00 North by 7.0 East at 547
Meters.”
I think I have the answer. I know when I was selling Tbolts I would
PhotoShop out every digit after the decimal point so the displayed
Pete wrote:
It'd be nice if there was some way to keep the crystal going
through power interruptions, even if the oven itself cooled off. I
suspect Trimble (correctly) assumed that the vast majority of these
units were to be installed in cell sites with reliable power so that
wouldn't be an
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