Dear all
I am an amateur astronomer working in the field of minor planet occultation.
To arrange a precise reference time I am looking for a 1/100 sec LED dispaly
clock GPS based. (LED is usefull for night vision)
My idea is to use a ebay used master clock such as ThunderBolt GPS
Dear all
I am an amateur astronomer working in the field of minor planet
occultation.
To arrange a precise reference time I am looking for a 1/100 sec LED
dispaly clock GPS based. (LED is usefull for night vision)
My idea is to use a ebay used master clock such as ThunderBolt GPS
Hi Paolo!
On 03/11/2011, at 10:44, paolo.mart...@alice.it paolo.mart...@alice.it
wrote:
Dear all
I am an amateur astronomer working in the field of minor planet occultation.
To arrange a precise reference time I am looking for a 1/100 sec LED dispaly
clock GPS based. (LED is usefull for
I've noticed a few GPS antennas give a gain in units of dBic.
http://www.maxtena.com/datasheets/m1227hct-a-sma.pdf
Does anyone know what this means? I've come across dBi and dBd, but
never dBic.
Dave
___
time-nuts mailing list -- time-nuts@febo.com
Hi,
Obviously you cannot read a 100Hz display. I assume you have some kind of
signal that you want to use to generate a timestamp, like a stopwatch but for
absolute time rather than relative. Some timing GPS receivers have a trigger
(event capture) input that generates a time stamp. Trimble's
Here, try this link:
http://lmgtfy.com/?q=dbic+gain+definition
-Chuck Harris
David Kirkby wrote:
I've noticed a few GPS antennas give a gain in units of dBic.
http://www.maxtena.com/datasheets/m1227hct-a-sma.pdf
Does anyone know what this means? I've come across dBi and dBd, but
never
So its just 'dB' relative to a circular polarised isotropic radiator -
never knew that before!
On 03/11/2011 13:18, Chuck Harris wrote:
Here, try this link:
http://lmgtfy.com/?q=dbic+gain+definition
-Chuck Harris
David Kirkby wrote:
I've noticed a few GPS antennas give a gain in units of
At 15:13 03-11-11, you wrote:
So its just 'dB' relative to a circular polarised isotropic radiator
- never knew that before!
Correct. It is the standard way to declare the gain of a circularly
polarized antenna when receiving or transmitting circularly polarized
waves, as dBi is valid only
Hi Paolo:
Is there some reason for not using the Kiwi Video Time Inserter, it was made
for occultation timing.?
http://www.pfdsystems.com/kiwiosd.html
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
paolo.mart...@alice.it wrote:
Dear all
I am an
I also have had need of a high resolution display clock for
photographic time stamping.
For those of you working on this make sure not to use a
LCD or VFD display. The response time is too slow. Also
you can rule out any sort of TV display.
If using LED make sure not to multiplex the digits.
Hi Paolo:
Is there some reason for not using the Kiwi Video Time Inserter, it was
made for occultation timing.?
http://www.pfdsystems.com/kiwiosd.html
Have Fun,
Brooke Clarke
Production of the KIWI-OSD has ended - perhaps?
Cheers,
David
--
SatSignal software - quality software written to
Hi Tom,
How about using Binary for the last couple of digits? 4 LEDs for a digit in
BCD. Saves on pins and wiring.
Robert G8RPI.
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday,
Hi,
Hi Tom,
How about using Binary for the last couple of digits? 4 LEDs for a digit
in BCD. Saves on pins and wiring.
I had the same idea, although my idea was to just make it completely
binary and use OCR on the photograph to find the time.
Maybe adding 2 surrounding always-on other colored
It would be easy to serial shift through an SPI interface. At 1MHz, which is
conservative for SPI, you would be done in a few uS, which would be more than
adequate even for a mS clock.
Since my Thunderbolt Monitor already decodes the Trimble TSIP protocol, it
would be easy to modify the
How about using Binary for the last couple of digits? 4 LEDs
for a digit in BCD. Saves on pins and wiring.
The pin savings is minor (10 bits of binary is 12 bits of BCD) and
the inconvenience to the user viewing the photograph is great. So
I rejected binary. Remember even 1950's frequency
Hi David,
Ah, I didn't realize this was based on the Trimble board - I was
having a mental seizure and thinking it was using a Motorola OnCore,
as so many of the others did. Are you really sure it is an SV6?
Trimble also made an SV8 timing that was in the same form factor and
if it was
I assume you are taking video of the occultation and want to time tag each
frame? If so then there is a better way. All current video standard allow
a place in the video stream for time tags. This works much the same way as
with still cameras that recordthe date in the image files. You would
Tom,
I checked the spec for the VFD display I am using with my GPS Monitor, but
there is no spec for how fast the segments are updated. I know that the
external interface is much faster than that of the LCD, even though the
commands are the same and the two are generally compatible. Visually,
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