On Wed, Apr 12, 2017 at 11:18:00AM -0700, jimlux wrote:
> Yep. There's been a fair amount of work over the past decades on using
> modulated reflectors for measuring antenna patterns (e.g. on phased
> arrays). You can have a diode/dipole suspended by resistive leads (with
> an impedance of
On Fri, Nov 04, 2016 at 06:53:53PM -0500, David wrote:
> On Fri, 4 Nov 2016 18:43:03 -0400, you wrote:
>
> >...
> >
> > There HAVE been attempts to deliberately jam cable distribution
> >satellites... mostly the EIRPs used for distribution signal uplinks
> >make this a bit difficult, but it
On Fri, Nov 04, 2016 at 06:19:13PM -0400, David I. Emery wrote:
> Solar outages are not greatly worse on C band.
>
> It WAS true that EIRPs at C band were kept lower at one time (to
> protect the now mostly completely abandoned terrestrial C band microwave
> telephon
On Fri, Nov 04, 2016 at 03:19:20PM -0700, Hal Murray wrote:
>
> petervince1...@gmail.com said:
> > Sorry Don, I beg to differ. The effects are often not noticeable in these
> > days of digital television, but the noise-floor can definitely be seen to
> > rise dramatically on a spectrum analyser.
On Fri, Nov 04, 2016 at 09:58:50PM +, Mark Sims wrote:
> I was a local electronics parts store this afternoon and they were
> saying some of the satellite TV internet infrastructure was being
> DDoS'd... ah, the subtle wonders of a few hundred thousand hacked TV
> cameras yammering down your
On Fri, Nov 04, 2016 at 06:11:48PM -0400, David I. Emery wrote:
>
> The solar outage season (a loss of signal for about 10 minutes
> max when the sun is directly behind the satellite as seen from the dish)
> runs from very late Sept (deep south) to about Oct 15 or so (Canada).
On Fri, Nov 04, 2016 at 05:51:35PM -0400, Don Murray via time-nuts wrote:
> DirecTV and DishNetwork are on Ku-Band platforms.
> Ku-Band is not affected by sun outage.
I beg to differ !!!
The sun is still plenty energetic enough at 10-12 Ghz to
override weak satellite
On Fri, Nov 04, 2016 at 04:52:25PM -0400, paul swed wrote:
> U with respect to direct TV is it the noramal two time per year sun
> outage its about the right time.
> Regards
> Paul.
Nope way off...
The solar outage season (a loss of signal for about 10 minutes
max when
On Tue, Jul 05, 2016 at 10:20:14PM -0400, David I. Emery wrote:
>
> I might add I have been to Bletchly park myself but have been
> waiting for a return visit with my son (who will graduate with a CS degree
> in a year - and a biochem degree) rather than take my wife who really
I might add I have been to Bletchly park myself but have been
waiting for a return visit with my son (who will graduate with a CS degree
in a year - and a biochem degree) rather than take my wife who really
isn't all that into what it means...
On Tue, Jul 05, 2016 at 12:18:59PM -0400,
On Mon, May 18, 2015 at 09:52:03PM -0700, Jim Lux wrote:
Why iridium? Why not Sirius or XM or DBS. Unless you want something
world wide, as opposed to populated areas served by broadcast radio and
TV
Well it seems to me I remember Iridium is time domain duplex
around 1610 MHz or
On Wed, Dec 03, 2014 at 02:53:50PM -0500, Paul wrote:
On Wed, Dec 3, 2014 at 12:08 PM, Neil Schroeder gign...@gmail.com wrote:
I haven't really ever been able to talk to my
prs10 via serial
I took the easy way out and bought the interface board (directly from SRS).
Do you have
On Wed, Dec 03, 2014 at 08:46:58PM -0500, Bob Camp wrote:
But it seems that Morion rulez, noise-wise.
The OCXO in the TBolt beats the Morion parts by a wide margin.
That implies all Tbolts have the same OCXO... is that actually
true of most of the surplus ones ? Weren't there
On Sun, Sep 14, 2014 at 10:20:48AM -0400, paul swed wrote:
I still do not see why if I offset the LO to -150 hz I get a useful display
to judge timing. I am using the lissajous method.
Consider that with the LO offset 150 Hz you will have a 100 Hz
beat note with the mark tone and a 200
On Tue, Aug 19, 2014 at 12:08:24PM -0400, Joe Leikhim wrote:
My understanding is that the BFO and BTO values are self reported from the
SDU (Terminal in the aircraft) and they represent adjustments made by the
SDU. If so the BFO value would be the AFC adjustment relative to the OCXO
On Mon, Aug 18, 2014 at 04:18:30PM -0400, Brian, WA1ZMS wrote:
I thought that Inmarsat terminals had AFC to the sat's down-link. Not
to the degree of true phase-lock like DSN has but enough so that the
sat's abillity to do doppler correction on the uplink is valid to help
with BER, etc...
On Fri, Aug 15, 2014 at 03:09:23PM -0400, paul swed wrote:
I had discounted it because of the lack of info and totally unclear how to
get rid of the FSK. MSK is FSK just with a very narrow shift. Also the
effects of the fsk on the carrier. Hmmm glad I am typing this.
It may be that the mark
On Fri, Aug 15, 2014 at 04:56:01PM -0400, paul swed wrote:
Yes I can see on page 2 of the pdf thats the trick. Its a non costas loop
trick.
The action of the MSK card doubles the phase shift.
So it is the classic double the frequency stateless carrier recovery. that
may drop phase due to
On Fri, Aug 15, 2014 at 04:56:01PM -0400, paul swed wrote:
Yes I can see on page 2 of the pdf thats the trick. Its a non costas loop
trick.
That PDF is returning a 404 for me at the moment...
--
Dave Emery N1PRE/AE, d...@dieconsulting.com DIE Consulting, Weston, Mass
02493
An
On Fri, Aug 15, 2014 at 03:39:07PM -0700, Pete Lancashire wrote:
URL ok from here
The text of the original post had *s in the URL... which
didn't work so well...
Partly pilot error here...
Works OK without the *s
-pete
--
Dave Emery N1PRE/AE,
Well the actual details of the WWVB modulation and time
codes are now published.
Was just leafing through some journals while doing some
boring system configuration here...
IEEE Communications Magazine May 2014 has a paper on page 210
by Yingsi Liang, Oren Eliezer, Dinesh
On Mon, Mar 24, 2014 at 06:15:57PM -0700, Chris Albertson wrote:
Yes, word is that they were able to determine the Doppler shift in the
plane's signal. I'm surprised this was even recorded but it must have been
in the satellite's telemetry downlink. Projecting radial velocity and
On Wed, Mar 19, 2014 at 09:28:38PM -0700, nuts wrote:
A lot of these satellites have footprints for each antenna. I don't
know if the footprints are narrow enough to track a plane.
I do believe there is an time offset for each aircraft sent on
the forward control channel from the ground
On Wed, Jan 08, 2014 at 08:09:04PM -0500, Charles Steinmetz wrote:
Nathaniel wrote:
Following from that, suppose a jammer parks nearby and doesn't leave
in a timely fashion. How long does it take for the FCC to swoop in
(do they swoop? in my mind they do) and find the source?
One of my
On Sun, Oct 06, 2013 at 09:59:50PM -0700, Hal Murray wrote:
Suppose I lived near a major highway. Could I build a receiver that would
count jammers driving by? Could I track them (at least somewhat) with a
directional antenna on a rotator?
I would think this would be a natural
On Mon, Oct 07, 2013 at 08:02:13AM -0700, Jim Lux wrote:
On 10/7/13 7:46 AM, Collins, Graham wrote:
The AMSAT Fun Cube Dongle is a very capable and interesting device.
Interestingly it uses the same Elonics E4000 front end chip that many
of the inexpensive DVB-T devices do. Apparently Elonics
On Mon, Oct 07, 2013 at 11:30:57PM -0500, Bill Hawkins wrote:
In general, we expect a jammer to be involved in criminal activity.
What about a wilderness guide whose reputation is built on finding
the best spots to view Nature's wonders. Should he or she be happy
to let people in the guided
On Fri, Aug 23, 2013 at 03:03:13PM -0700, John Miles wrote:
Don't you just love paying to access research that your taxes already paid
for? Gives you a warm, fuzzy feeling all over. :-P
Now, now, perhaps it is better to feed the (GOP) pigs
than let them ban the research altogether as
On Sun, Jan 27, 2013 at 06:47:07PM -0500, Peter Gottlieb wrote:
What I would really like in Windows is a way to lock the configuration and
make it more of an appliance which always worked the same way. That way a
small board talking to a Thunderbolt would always start up and just run. I
On Sun, Jul 28, 2013 at 07:54:47PM -0400, Bob Camp wrote:
Hi
….
There was a suitcase Rb that was used to sync up Have Quick's on the ground.
It was a Magnavox product rather than Collins. The idea was to get the radios
netted up without *anything* going over the air. Since the radios
On Wed, Jul 10, 2013 at 08:10:45PM +0200, Magnus Danielson wrote:
On 07/09/2013 04:25 AM, Joseph Gwinn wrote:
Yes, of course, but I don't think I explained very well. The issue was
more economic than technical.
There isn't much spare space, weight, or power in the birds, technology
moves
On Wed, Jul 10, 2013 at 02:42:19PM -0700, J. Forster wrote:
David,
While I can easily see how you can do closed loop correctioin for Dopplar
from the transmission point for a 'bent pipe' repeater, at any other
location that correction would not be valid, because the paths are not
parallel.
On Wed, Jul 10, 2013 at 07:45:39PM -0400, Bob Camp wrote:
Hi
If the WAAS birds are run in a fashion that gives a true GPS payload
performance, why not assign them a SN 32 or below and use them?
If the WAAS birds are not in the right numbers, why bother to set them up
and spend the
On Wed, Jul 10, 2013 at 07:40:50PM -0400, David I. Emery wrote:
But if the satellite radiates what a local GPS package would and
transmits ephmerides defining its position and motion it could be
included in a GPS solution and could be used for timing and frequency
purposes the same
On Mon, Jun 17, 2013 at 02:41:13PM -0700, Burt I. Weiner wrote:
Chris,
The 8170 was originally intended to be a frequency reference source
tied to the USFS (United Stated Frequency Standard). It also gave
the time of day, but I believe that wasn't it's primary purpose. As
I recall,
is quite linear over enough of a range
one could perhaps just remodulate without AGC and create a replica of
both the modulation and fades on the local 60 KHz carrier.
Bob
On Jun 17, 2013, at 5:57 PM, David I. Emery d...@dieconsulting.com wrote:
On Mon, Jun 17, 2013 at 02:41:13PM -0700, Burt
On Mon, Jun 17, 2013 at 09:35:51PM -0400, paul swed wrote:
We as they say. I am most likely going to use a simple phase flipper.
That preserves all of the Nist stuff and traceability and such. A flipper
is simply a invert or non inverted signal and a switch. It is subject to
propagation.
On Mon, Apr 22, 2013 at 06:13:43AM -0700, J. Forster wrote:
Hi,
I recieved a very odd communication, apparently from eBay, this morning.
It is a request to contact Congress about sales taxes on internet sales.
It APPEARS to be genuine, but I'm unconvinced.
Has anybody else received this
On Sun, Apr 14, 2013 at 03:23:50PM +0200, Luciano Paramithiotti wrote:
I have a 9390-53120. The 16.368 reference for the GPS is coming from a
4 pin (14 pin size ) oscillator on the GPS interface board.
The other internal oscillator board mount a 1 MHz TCXO I never had
seen locked to GPS.
On Fri, Apr 12, 2013 at 11:48:47AM -0700, Burt I. Weiner wrote:
Sorry for the delay in posting this update. Things have been hectic,
and then there was NAB.
Here's what I've discovered: The receiver started working after
about 6 hours of just sitting. However, the 9390's internal
On Tue, Mar 26, 2013 at 07:39:51PM +0100, Alberto di Bene wrote:
On 3/26/2013 7:21 PM, Dan Kemppainen wrote:
Keep in mind, we are after all, taking about windows. An operating
system that IS NOT real time operating system. (You think it is, try
move a continuous stream of a few 6+ MBytes/Sec
On Tue, Mar 19, 2013 at 01:29:44PM -0400, paul swed wrote:
Peter you are in boston, I am in franklin. We must be 25-30 miles apart
Regards
Paul
Peter lives about 3 miles from my house in Weston... in
a corner of Natick abutting Weston. So three of us are quite close.
John Forster
On Fri, Nov 30, 2012 at 04:24:38PM -0600, shali...@gmail.com wrote:
I am not sure that a precision clock will help if the cpu is busy and skips
clock cycles. I believe this is one of the problems with general purpose OSes
like Windows.
I believe the better boards like the Soekis use
On Fri, Nov 30, 2012 at 09:58:29PM -0500, Bob Camp wrote:
Hi
The problem just the clock it's also the operating system. If it's not
designed with timing in mind (= it's an RTOS at some level) then you
will have sloppy timing. Counters can help, but they are not the entire
solution. If your
On Sat, Nov 24, 2012 at 08:35:44PM -0600, J. L. Trantham wrote:
Pete,
In the US, Galco sells a DDK product that works well. The connector and
shell are a DMS3106A18-22S.
http://www.galco.com/buy/DDK/DMS3106A18-22S
You will also need a clamp and strain relief. I use a DMS3057-10A.
On Mon, Oct 22, 2012 at 02:16:19AM -0400, johncr...@aol.com wrote:
Dale -
To your question re BPSK and DPSK. In both modes the phase shift is 180
degrees.
Straight PSK has the issue of determining the 1's from the 0's, at the
receiver as there is
no phase reference.
To avoid this DPSK
On Thu, Oct 18, 2012 at 12:47:30AM -0500, Edgardo Molina wrote:
Dear David,
Yes, I bought the same unit as you. I will come back to you tomorrow
with some serial number information.
I found mine is a DTE with TXD on pin 2... RXD on pin 3.
Seems to like 9600,8,n,1
On Sun, Oct 14, 2012 at 03:15:53PM -0700, Said Jackson wrote:
I believe Edgardo bought the reprogrammed 58503A unit (was a Z3805A
before) from Ebay.
I have the same units recently purchased from yinxhu(sp?) on Ebay and
Edgardo just confirmed these are indeed 16 channel units with true
In a mad moment at the NEARFest flea this weekend I grabbed
a 5061A for $250. Poor thing was getting wet in the rain and needed
a home. Really really heavy to carry to the car, however...
It has a high performance option 004 CBT in it (late SN
3112A02887 dated 05/93). And a
On Mon, Oct 15, 2012 at 06:15:15PM -0400, paul swed wrote:
David
Yes indeed I picked mine up for $125. Many hours of fun though the tube
really was bad. But sure learned a lot and as mentioned here on time nuts
actually have it working with a 5060 tube. John mentioned your location and
we are
On Mon, Oct 15, 2012 at 09:28:59PM -0400, David I. Emery wrote:
I live right near the business center of Weston on Boston Post
Road... (west of the center). If you know the area you might have
noticed a house with some discreet satellite dishes in the back yard...
and antennas
On Thu, Sep 27, 2012 at 11:16:45AM -0700, J. Forster wrote:
The bandwidth is secondary. The time-domain response of the filter is the
issue.
Seems clear that you need a reasonably wide preselection filter
to avoid this problem, maybe as someone suggests several hundred or more
hz to
On Sat, Aug 25, 2012 at 11:41:21AM -0700, J. Forster wrote:
Hi,
I recently picked up the Rb module from a Datum PRR-10 Precision Reference
Receiver.
The Rb connections are pretty obvious, but does anybody have any info on
the rest of the module? Even a schematic would help.
I'm trying
On Fri, Jul 27, 2012 at 09:42:49PM -0400, Brian, WA1ZMS wrote:
Does anyone know if there is ANY recent active Lightsquared testing taking
place in the SFO area of the US?
I'm dealing with a day-job issue with GPS clocks in the Bay Area showing
GPS unlocked errors from 3rd party
On Fri, Jul 20, 2012 at 02:51:33PM -0500, Peter Gottlieb wrote:
Hmmm!
Subpart H--Rules Applicable to All Broadcast StationsSec. 73.1545 Carrier
frequ
ency departure tolerances.(a) AM stations. The departure of the carrier
frequenc
y formonophonic transmissions or center frequency for
On Sat, Jul 14, 2012 at 06:15:14AM -0700, J. Forster wrote:
I don't see why school crossing signs, water sprinklers, street or outdoor
lighting need 1 second timing. Ten minutes, or a photocell, would be more
than adequate.
While there are many many other applications, the issue for
On Wed, Jul 11, 2012 at 03:48:52PM -0400, paul swed wrote:
David
Read your comments and have been traveling. So finally a chance to email.
I read the document also and walked away with what I shared.
In your reading would you believe the following.
Its an absolute phase and that when it
On Sat, Jul 14, 2012 at 02:38:34AM +0200, Magnus Danielson wrote:
I think the PTTI article isn't as much documentation as presentation of
general principle, showing details more as to present how it can be
done, but not necessarily guarantee it will be done that way. Knowing
the
On Fri, Jul 13, 2012 at 09:47:12PM -0700, Brooke Clarke wrote:
Hi:
The key thing GPS is lacking is Daylight Savings Time.
WWV WWVB have the DST bits that allow a clock to show the local time.
And that is important for most routine civil human use.
Nor something that could
On Sun, Jul 08, 2012 at 09:02:53PM -0400, Bob Camp wrote:
Hi
The gotcha is that they may change the sync word based on test data.
They may also tweak other vague points in the spec based on the troubles
they run into in their tests or with their silicon.
I finally read the
On Thu, Jul 05, 2012 at 04:19:25PM -0700, J. Forster wrote:
If propagation goes south, you loose track of the carrier phase, the basis
of the system. If your local standard is stable and close to right, that's
not a big deal. If not, you can easily go down the garden path.
If I read
On Sun, Jun 03, 2012 at 09:20:59AM -0700, J. Forster wrote:
Is there any indication the carriers of WWVB and MSF are locked together?
-John
=
Given it's only 60 KHz and certainly somewhere north of parts in
10^13 and probably down to 10^14 or 10^15 the distinction
On Mon, May 07, 2012 at 08:28:41AM -0700, J. Forster wrote:
A crummy crystal oscillator zero beated to WWV is good to 1 in 10E6, a Rb
disciplined to GPS maybe 1 in 10E11.
Do you seriously think you, or anybody, can hear a pitch difference of
0.001 Hz in the audio range?
A quartz crystal
On Mon, May 07, 2012 at 06:13:56PM -0700, J. Forster wrote:
A movie may be 7000 seconds, and you may need a fairly stable timebase,
but every movie I've watched is made up of short (300 second) scenes that
are placed sequentially on the framework.
5-10 seconds a cut is quite common,
On Sun, Apr 15, 2012 at 05:54:31PM -0400, paul swed wrote:
Yet another time nut that makes at least 4 at MIT! Thats a very dense
population.
I sometimes go myself, making at least 5... wasn't there this morning
though...
--
Dave Emery N1PRE/AE, d...@dieconsulting.com DIE
On Mon, Jan 02, 2012 at 11:57:55AM -0500, w...@aol.com wrote:
FYI... NBC advances their video feed, so that it arrives out of the
station receiver on time.
Several nets do this - of course useless when real time events
are being televised... as the delays are still there, all this
On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
To me the ball drop/fireworks was different from the on-screen time on FOX
by a few secnds.
I was watching the media pool HD satellite feed on AMC-1 and
through a broadcast grade IRD (ex PBS Bitlink ) it appeared to be about
2
On Sun, Jan 01, 2012 at 09:14:03PM -0800, J. Forster wrote:
I was referencing anything to an external, local reference. My comment was
the time difference between the FOX on screen timing and the ball dropping
fireworks. Presumably, the on-screen timing was inserted at their local
control
On Wed, Oct 12, 2011 at 07:33:29AM -0400, Peter Gottlieb wrote:
I would like to get better than 100 uSec so I can get a couple of degrees
resolution on a synchrophasor project.
Once one gets into that region with OSes one gets into a kind of
relativity...
It all
On Sun, Jul 10, 2011 at 08:48:07AM +0530, Raj wrote:
Analog generation *know* the time from the position of the
clock hands. By the position of the hands you know how many minutes left
to an appointment etc. IF you ask them the time then it will take a
moment to convert it to words!
On Fri, Jul 08, 2011 at 11:11:34AM -0700, Burt I. Weiner wrote:
Being in broadcast I need to know what time it is. I wear a wrist
watch with real hands on it so I can tell what time it is. For a
wrist watch, I personally don't care for a digital readout. I grew
up with a wrist watch that
On Fri, Jul 08, 2011 at 08:12:42PM -0400, brent evers wrote:
I've actually found the separate mechanical and digital displays quite
useful. I spent a lot of time on science vessels and would set one to
science time (GMT) and the other to what ever timezone we happened
to be adhering to for
On Thu, Jun 30, 2011 at 03:29:49PM -0700, J. Forster wrote:
If over-the-air TV were abolished, that would leave all broadcast media in
the hands of Comcast and Verizon and their $100+ charges.
Broadcast TV will never go away... far too important to the
political class as a place for
On Sat, Apr 02, 2011 at 04:13:55PM -0400, Chuck Harris wrote:
Unlike simply stabilizing the BFO crystal as you propose.
Has anyone given any thought to an alternative - phase locking
the original BFO Xtals with a very narrow bandwidth loop to something
derived from the 10 Mhz standard
On Mon, Apr 04, 2011 at 02:00:14AM -0400, David I. Emery wrote:
On Sat, Apr 02, 2011 at 04:13:55PM -0400, Chuck Harris wrote:
Unlike simply stabilizing the BFO crystal as you propose.
Has anyone given any thought to an alternative - phase locking
the original BFO Xtals with a very
On Mon, Apr 04, 2011 at 07:19:38AM -0400, Chuck Harris wrote:
Basically, the higher the division ratio in a PLL synthesizer,
which is what you are describing, the greater the phase noise.
No question about that, indeed.
But I am talking about a very low bandwidth loop
On Sat, Mar 12, 2011 at 01:29:55PM -0800, J. Forster wrote:
2) For this company to have high bandwidth they're going to need a
precision time source at each transmitter. Will it be gps??? :-)
A sheet of aluminum as a ground plane below their GPS antennas will kill
a lot of QRM if the
On Wed, Mar 09, 2011 at 08:01:31AM +, Poul-Henning Kamp wrote:
Well, how can you argue with closing a system that was aiding terrorists ?
The reason LORAN-C got killed was that DoD/DHS couldn't jam it if a
terrorist with a suitcase-nuke was trying to find his way to Congress.
Is
On Mon, Nov 15, 2010 at 06:20:55AM -0800, jimlux wrote:
Mike Feher wrote:
10 MHz locked LNBs do not use a separate connector. Everything goes down/up
the single main coax. The typical L-band down-converted frequency and the
10
MHz are easily separated, as is the DC. These are definitely not
On Sat, Nov 13, 2010 at 07:01:26AM -0800, jimlux wrote:
To the Ku-band downconverters.. They're pretty crummy (but have a
decent SNR to work with).. however, I've seen that there are two kinds..
a vanilla LNB and ones described as crystal locked... both are cheap
($20-30 for the former,
On Sun, Oct 31, 2010 at 12:25:22PM -0700, J. Forster wrote:
Two comments:
I have a lot of Tek 7xxx stuff and almost none of it cost anything like
$0.50 on the dollar. Virtually everything cost well under $0.10 /dollar.
I would agree... I have rarely seen 80s/90s used TE sell for
more
On Sat, Oct 23, 2010 at 02:44:51PM -0700, J. Forster wrote:
Very true, except it's more like 5-10 years.
These days John is absolutely right... likely none of the
developers, none of the equipment, perhaps not even the corporate
shell of the division or department that designed the
On Fri, Jan 29, 2010 at 05:15:51PM -0800, J. Forster wrote:
To my aging eyes, the flashlight looks distinctly blue-white. I don't know
how these particular LEDs are built, but the unit is less than a year old.
My understanding is that a lot of high brightness white LEDs
are internally
On Sun, Dec 13, 2009 at 07:39:05AM +, Poul-Henning Kamp wrote:
In message 2157.12.6.201.67.1260689371.squir...@popaccts.quik.com, J.
Forste
r writes:
I'm not so sure about the Nova 1200. I think all the Novas had the RTC was
on a standard I/O board, [...]
No, it was an option, but
On Sun, Nov 29, 2009 at 12:25:06PM -0800, Mark Spencer wrote:
The main difference is that receiving lf signals is challenging in
many areas built up areas and the doppler shift of hf via sky wave
reduces the accuracy considerably, while there are already a large
number of exisiting high power
On Sun, Nov 15, 2009 at 08:22:50PM -0600, Didier Juges wrote:
I think the problem with the Monterey Bay jammer was that he was jamming the
DGPS correction signal, not the GPS signal itself. The DGPS correction
signal is sent over the UHF band. Most marine GPS are DGPS because they need
the
On Sun, Nov 15, 2009 at 08:56:36PM -0600, Didier Juges wrote:
I don't disagree that it would be fairly easy to disrupt the consumer
devices, but other than a few missed appointments and frustrated gadget
freaks, and the occasional emergency vehicle not finding its way to the
scene of an
On Sun, Nov 15, 2009 at 07:17:37PM -0800, J. Forster wrote:
There were, of course, no map or chart displays. Imagine what 20+ years of
development would have brought.
E Loran could supply the same basic position information as input
to charting and mapping software as GPS does... most
On Fri, Nov 13, 2009 at 09:51:11AM -0800, J. Forster wrote:
WWVB not WWV.
IMO, WWVB is MUCH fussier than LORAN. It's just utter stupidity that LORAN
is being shut down.
I have emailed my brother in law who is a rear admiral (I think
now called a vice admiral) and currently CFO of the
On Fri, Oct 30, 2009 at 11:39:37PM -0400, Glenn Little WB4UIV wrote:
Keep in mind that anything much newer than the 141T will have custom
parts and processors.
This makes the instrument smaller and more versatile, but, less repairable.
The 141T is a workhorse.
I would not trade mine for
On Sat, Oct 17, 2009 at 09:44:12PM -0400, Tim Cwik wrote:
I would like to use gpsd to provide time information from the Tbolt to
ntpd on one of my servers but I would also like to be able to monitor
Tbolt operations with Lady Heather. I am planning to make a splitter for
the rs-232 from
On Tue, Oct 13, 2009 at 10:14:56PM +0100, David Kirkby wrote:
2009/10/13 Poul-Henning Kamp p...@phk.freebsd.dk:
In message 286f7bad0910130703v6680affbx95905a440...@mail.gmail.com,
David
Kirkby writes:
I've asked this on comp.unix.shell, but never got a 100% satsifactory
answer.
On Mon, Oct 05, 2009 at 12:35:17PM -0700, J. Forster wrote:
My main gripe w/ Rb and especially Cs is they have very limited lives.
IMO, it's just not worth paying extra money for stability I don't need. If
I ever do need their capabilities, there are several on the shelf, but
until then they
On Sun, Oct 04, 2009 at 12:20:26AM -0700, Hal Murray wrote:
Why the ban on AM/FM receivers?
I assume it's EMI from the local oscillator.
Is anybody shipping an AM/FM radio that isn't superhet?
FWIW, I have read and been told that there was an era when some
cheap AM/FM radios put
On Sun, Oct 04, 2009 at 09:14:29AM +, Robert Atkinson wrote:
Hi,
This is correct. There was also an issue with harmonics from the local
oscillator in the aircraft's own VHF nav/comm receivers blocking the
GPS. The answer is a 1575MHz notch filter, e.g.
On Sun, Oct 04, 2009 at 03:06:12PM -0500, Bill Hawkins wrote:
See Joe Mehaffey's list of airlines at
http://gpsinformation.net/airgps/airgps.htm
The list of airlines that allow GPS have the caveat that the Captain has the
final decision.
It is interesting that American is listed as
On Thu, Oct 01, 2009 at 08:21:28AM -0500, Bill Hawkins wrote:
Group,
I'll be flying around the world from Minnesota, USA, to Kuala Lumpur,
Malaysia, to give a talk on industrial process control.
Bought a Garmin 60CSx handheld GPS so I could tell precisely when I
crossed the date line (a
On Thu, Oct 01, 2009 at 08:11:42PM -0600, Greg Burnett wrote:
How do US TV stations disseminate time to DTV converter boxes? ...And is
this time derived from GPS data, or???
There is a time of date message stream (TDT) defined for MPEG
transport streams and that and a slightly
On Sat, Aug 15, 2009 at 03:34:29PM -0700, Lux, Jim (337C) wrote:
Haven't all of the VHF weather satellites been decommissioned?
Could be. I suspect that those antennas have been up on those boats for
decades.
Hardly, there are still the old analog APT satellites in operation
plus
On Fri, Aug 14, 2009 at 08:03:58PM -0700, Hal Murray wrote:
My Panasonic VIC100 antenna had a few screws to hold the bottom to the
plastic cone top. The bottom had an o-ring seal that stuck a little
but was still pretty easy to slide the bottom from the top half.
Inside was a patch
1 - 100 of 144 matches
Mail list logo
