Hello!
Years ago, I sometimes played the transmitter hunting game, probably known to
most of the members of this list.
A friend of mine recently suffered a theft so I thought about the opportunity
to embed little marker transmitters in some object usually left in the yard
(like bicycles for
From:
http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-outages
MSF signal off-air
Please note that the MSF signal has had to be taken off-air from Saturday
evening, 24 May, until late Tuesday, 27 May, at the earliest, due to a
technical fault.
Further
There has been some controversy over the Phase noise of CMOS logic devices.
Perhaps the apparently anomalously low PN measures are due to the use of cross
correlation in the phase noise measurement equipment and the occurrence of
phenomena detailed in the recent NIST papers:
Hello Andrea,
The angle could be found with a directional antenna or inerferometry, but about
the distance?
About the only reliable way to locate hidden transmitters is by field
strength. The problem in built-up areas is reflections.
At one time Doppler DF systems were popular, but anybody
My question is this: Under what conditions can the
1 PPS signal be relied on to meet its period uncertainty
spec? The UT+ emits 1 PPS regardless of whether
satellites are visible or not
Look under the TRAIM settings. You should have several choices:
1PPS disabled
1PPS always on
1PPS when
Hi Andrea:
There are a number of object location schemes. I got interested after seeing the blue dot in the movie The Da Vinci
Code.
It is a totally fictional device.
A lot of new products like a blue dot are coming on the market based on
Bluetooth and the use of smart phones.
But there are
Hi:
Classical tide gauges measure the height of the water relative to the gauge. But since the gauge is attached to a
tectonic plate it's elevation is changing.
This is one of the problems I have with the claim that sea level is rising at 2mm per year. i.e. how well can they back
out the
Have a look at Bluetooth low energy. I am working with some nice Modules
from Bluegiga (BLE112), they just announced a long-range version.
Although they are already very conservative with power and will run for
a while even with a button cell, a mercury switch (sorry) could trigger
them upon
You don't need much power because the device in the toy only needs to
transmit for a few milliseconds then shut off. Some transmuter you
have pings the device in the toy that acts like a transponder. It
only transmits in response to a ping. So limey it can be powered
by a button battery.
Hi Chris:
The trouble with a transponder is the receiver is a power hog.
One way to mitigate that is to have the receiver operate on a low duty cycle and use a transmit signal that's longer
than the receive period.
The military PRC-68 squad radio used this method and the squelch opened so fast
I should mention that the circuit that I attached in the previous post does not
output at 49.152 MHz The output is the third (or fifth?) harmonic of the
crystal frequency...
___
time-nuts mailing list --
I'm using 74HC series for the divider/gate.
I appreciate all the troubleshooting help, however, I still don't know under
what conditions the 1 PPS output should be relied on (with zero satellites
acquired? one? four? all eight?, and what can be expected of the 1 PPS output
interval if there
At 06:40 AM 5/27/2014, Graeme Zimmer wrote:
A simple beam or dipole is useful, but only when out in the open country
I have seen some of the equipment used by FCC field agents when DFing
deliberate interference to aircraft communications. They used three
transportable fixed mountaintop
Andrea;
I am a professional in this industry and I can tell you there is no need to
invent this; there are literally dozens of these products out there. There
are (as you figured out already) 2 parts to the product; the GPS this is
where I am component and the reporting component. While GPS
On Tuesday, May 27, 2014, Mark Sims hol...@hotmail.com wrote:
I should mention that the circuit that I attached in the previous post
does not output at 49.152 MHz The output is the third (or fifth?)
harmonic of the crystal frequency...
I have had very good luck with these 433 MHz TX
This type of artifact isn't unheard-of, but it's usually not hard to spot
because the divots in the PN trace don't look much like a real property of
the DUT. At least with direct-to-ADC digital analyzers, the effect of
spectral collapse on the noise plot seems to be time variant in many
I built some RF beacons for my friend's high power (TRIPOLI) rocketry
projects. We use a TELEVILT UHF wildlife tracking receiver from Sweden
(pricey) that operates in the 434 MHz ISM band. The transmitters are
LINX TXM-LR series transmitter chips with an 8 pin PICAXE processor. The
modulation
On 5/27/14, 10:24 AM, Brooke Clarke wrote:
Hi:
Classical tide gauges measure the height of the water relative to the
gauge. But since the gauge is attached to a tectonic plate it's
elevation is changing.
This is one of the problems I have with the claim that sea level is
rising at 2mm per
Hello to the time experts,
I own a nice HP-58503A and I would be happy
to find a pdf version of the complete service manual
for it. Is somebody in the position to help me
or to give me a hint where I could find it?
Thank you very much,
regards,
John
On 5/27/14, 10:24 AM, Brooke Clarke wrote:
This is one of the problems I have with the claim that sea level is
rising at 2mm per year. i.e. how well can they back out the plate
movement in historical tide gauge records?
Let's assume they are NOT good at this and are working with factor of
On Tue, May 27, 2014 at 11:32 AM, Brooke Clarke bro...@pacific.net wrote:
Hi Chris:
The trouble with a transponder is the receiver is a power hog.
Why does a receiver have to be a power hog? I remember building a
receiver once that did not use any power other then the energy coming
in from
21 matches
Mail list logo
