On Mon, Feb 4, 2013 at 9:17 PM, Hal Murray hmur...@megapathdsl.net wrote:
Can you re-transmit on a nearby frequency without blasting the receiver off
the air?
No not if it is in the same band, filters are never that good. I
thought the OP had several bands available.
So if this all needs to
Think OP has the Choice of 3 bands
Sent from my iPhone
On Feb 5, 2013, at 12:32 PM, Chris Albertson albertson.ch...@gmail.com wrote:
On Mon, Feb 4, 2013 at 9:17 PM, Hal Murray hmur...@megapathdsl.net wrote:
Can you re-transmit on a nearby frequency without blasting the receiver off
the
About this subject, are you concerned with multipath? The signal from two
of the basestations might arrive over a line-of-sight path whereas for the
third basestation the signal might bounce around before arriving...
JP
-
To time experts/EE's.
I would like to
Yes, we would need to address that as best we can. I thought of using two
different frequencies to combat that to provide additional data.
There is also the aspect that the mobile device is not expected to move too
fast so if we see a big change we look at it with suspicion.
Most likely one
I think for best timing rather then use a ping Where the device gets
a signal, waits then sends a reply it would be better to re-transmit
the signal in real time. So the base station send some waveform like
carrier that is modulated by a saw tooth wave. The remote device
simply re-transmits
albertson.ch...@gmail.com said:
I think for best timing rather then use a ping Where the device gets a
signal, waits then sends a reply it would be better to re-transmit the
signal in real time. So the base station send some waveform like carrier
that is modulated by a saw tooth wave. The
rickhar...@gmail.com said:
I would like to triangulate a position of a device which moves using 3 fixed
positions devices of known location. The idea is to have these operate on
915mhz or 434mhz or 2.4ghz or appropriate frequency.
I'd like a range of 150 feet or better and accuracy of 3
and even a more crazy idea: use a phasing array for the directional antenna.
On Fri, Feb 1, 2013 at 10:45 AM, Hal Murray hmur...@megapathdsl.net wrote:
rickhar...@gmail.com said:
I would like to triangulate a position of a device which moves using 3
fixed
positions devices of known
Also the fixed stations can not have OCXO?
On Fri, Feb 1, 2013 at 5:37 AM, Rick Harold rickhar...@gmail.com wrote:
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed positions devices of known location.
The idea is to have these operate on
Hi Rick,
You would do better putting a small GPS receiver in the mobile and transmit with
a 2.4 GHz Blue tooth transmitter. The GPS devices can be gotten very small
(your
thumb would just about cover it up). They are also very light and draw very
little power. That would save you two
Hi Rick,
You would do better putting a small GPS receiver in the mobile and
transmit with
a 2.4 GHz Blue tooth transmitter. The GPS devices can be gotten very
small (your
thumb would just about cover it up). They are also very light and draw
very
little power. That would save you two
Can the base stations be interconnected via cable?
In that case, wouldn't it suffice to have the mobile device send an
unmodulated carrier of low enough frequency, and compare the phase
between the receiving base stations, taking the (known) cable delays
into account?
Cheers
Stefan
Rick
On 1/31/13 8:37 PM, Rick Harold wrote:
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed positions devices of known location.
The idea is to have these operate on 915mhz or 434mhz or 2.4ghz or
appropriate frequency.
These two type of devices
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Rick Harold
Sent: Thursday, January 31, 2013 10:37 PM
To: time-nuts@febo.com
Subject: [time-nuts] question for expert time guys
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3 fixed
positions devices
On 2/1/2013 3:45 AM, Hal Murray wrote:
rickhar...@gmail.com said:
I would like to triangulate a position of a device which moves using 3 fixed
positions devices of known location. The idea is to have these operate on
915mhz or 434mhz or 2.4ghz or appropriate frequency.
I'd like a range of
To: time-nuts@febo.com
Subject: [time-nuts] question for expert time guys
Message-ID:
CAODR2TDuMSpOr8JYvjMm-QRnRhM8sxYGkY=vrn6yttk5t3t...@mail.gmail.com
Content-Type: text/plain; charset=ISO-8859-1
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed
Subject: Re: [time-nuts] question for expert time guys (Hal Murray)
Hello Hal -
I spent a lot of my RF engineering career in related areas, including radar,
EW, and spread spectrum timing
systems. Since the distance is short and the cost is an issue you may wish
to consider an analog
system
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed positions devices of known location.
The idea is to have these operate on 915mhz or 434mhz or 2.4ghz or
appropriate frequency.
These two type of devices (fixed and mobile) are all under my control
18 matches
Mail list logo
