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PA2AGA > HDDIG 11.04.00 10:01l 215 Lines 7686 Bytes #-9514 (0) @ EU
BID : HD_2000_98C
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Subj: HamDigitalDigest 2000/98C
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DGPS would be the same, except the circle would be only about 60 feet
in diameter.
73 de N3HGB
------------------------------
Date: Thu, 6 Apr 2000 10:16:05 -0700
From: "Jim Donohue" <jim_donohue@computer.org>
Subject: Will a GPS provide continuous, accurate altitude measurements?
You can easily average out the SA which have a 1 hour average close to zero.
Some of the propogation sfutt will average but there are some things that
may not. You can probably get under 10 meters, maybe better in 24 hours.
Jim KO6MH
Joe Della Barba <joedb@spambegone.earthlink.net> wrote in message
news:38eca20b.1097931522@news.earthlink.net...
> On 6 Apr 2000 13:46:41 GMT, bill@cs.uofs.edu (Bill Gunshannon) wrote:
>
> >In article <8cgm18$m5v$1@bob.news.rcn.net>, "Bob Lewis" <aa4pb@erols.com>
writes:
> >|> > GPS seems to be fairly good for tracking the location of
> >|> > moving objects, but almost useless for staionary ones
> >|>
> >|> The accuracy is the same moving or stationary - you just don't notice
> >|> the error so much when you're moving. GPS with a differential receiver
> >|> and sitting at a fixed location for a period of time is often used by
> >|> surveyors to fix a point within millimeters.
> >
> >Interesting point. How consistent is the error?? If one were to
collect,
> >say 24 hours worth of position data and then plot the whole thing would
it
> >be likely (possible?) that the center of the plot wold actually reflect
your
> >true and accurate location??
> >
> >bill
> >
> >--
> >Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three
wolves
> >bill@cs.uofs.edu | and a sheep voting on what's for dinner.
> >University of Scranton |
> >Scranton, Pennsylvania | #include <std.disclaimer.h>
> I have done this. I put a GPS in plot mode on my back deck overnight.
> You get a circle about 600 feet in diameter with you in the middle.
> DGPS would be the same, except the circle would be only about 60 feet
> in diameter.
> 73 de N3HGB
>
------------------------------
Date: Thu, 06 Apr 2000 17:54:30 GMT
From: Scott <W5EMT@arrl.net>
Subject: Will a GPS provide continuous, accurate altitude measurements?
The GPS satellites broadcast another signal, encrypted, that accounts
for the SA degradation. Only the military GPS receivers are capable of
receiving and decrypting this signal, hence their accuracy is better.
The gov't need not make the civilian system more accurate (or less
degraded) when the military is preparing to act... the system is
accurate ALL the time, we petty civilians just don't have the means to
"understand" it.
- Scott
------------------------------
Date: Thu, 6 Apr 2000 19:53:50 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: Will a GPS provide continuous, accurate altitude measurements?
Scott <W5EMT@arrl.net> wrote:
>The GPS satellites broadcast another signal, encrypted, that accounts
>for the SA degradation. Only the military GPS receivers are capable of
>receiving and decrypting this signal, hence their accuracy is better.
It is not really like that. The satellites broadcast two different
signals. The commercial units use one signal, which is further worsened by
SA. The military units use both signals, i.e. a different modulation of the
same signal used by the commercial units, plus a second signal. This
mode is better than the commercial mode even without SA, for some different
reasons (one of them: the two different frequencies allow compensation of
certain propagation effects).
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Thu, 6 Apr 2000 16:50:34 -0400
From: "Bob Lewis" <aa4pb@erols.com>
Subject: Will a GPS provide continuous, accurate altitude measurements?
Yes, but the military signal is encrypted and you have to have the key
to use it.
Rob Janssen <nomail@rob.knoware.nl> wrote in message
news:slrn8epqqe.614.nomail@linux.pe1chl.ampr.org...
> Scott <W5EMT@arrl.net> wrote:
> >The GPS satellites broadcast another signal, encrypted, that
accounts
> >for the SA degradation. Only the military GPS receivers are
capable of
> >receiving and decrypting this signal, hence their accuracy is
better.
>
> It is not really like that. The satellites broadcast two different
> signals. The commercial units use one signal, which is further
worsened by
> SA. The military units use both signals, i.e. a different
modulation of the
> same signal used by the commercial units, plus a second signal.
This
> mode is better than the commercial mode even without SA, for some
different
> reasons (one of them: the two different frequencies allow
compensation of
> certain propagation effects).
>
> Rob
> --
>
+----------------------------------+----------------------------------
----+
> | Rob Janssen pe1chl@amsat.org | WWW:
http://www.knoware.nl/users/rob |
> | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS:
PE1CHL@PI8WNO.#UTR.NLD.EU |
>
+----------------------------------+----------------------------------
----+
------------------------------
Date: (null)
From: (null)
--
Rick Ruhl
President, Creative Services Software
http://www.cssincorp.com
"Cathryn Mataga" <cathryn@junglevision.com> wrote in message
news:d_7H4.4017$ZE4.79813@ord-read.news.verio.net...
>
> "Jerry Flanders" <jflanders2@home.com> wrote in message
news:38ecf989.349607033@news...
> > I am brand new to VHF packet, and am trying to check out a used KAM+ I
> > just purchased. I have it connected to my FT-847.
> >
> > I hear a lot of packet activity here (near Augusta, GA) on 145.75, but
> > cannot print a single character of it! I assume it is 1200 baud, but I
> > don't know that for sure. Is it likely to be 9600, which would explain
> > my lack of copy? If so, where can I find 1200 to copy?
> >
> > The receive LED on the KAM+ lights when I unsquelch the radio (and
> > when the 145.74 packet "noise" breaks the squelch, also). Also, when I
> > do a "connect" command to a fictitious station, the FT-847 seems to
> > transmit OK, so I probably have my KAM+ to FT-847 cable wired up AOK.
> >
> > Any tips? I just want to make sure everything is working OK.
>
>
> Well, if it sounds like a 'hisss' -- almost like an unsquelched
> FM radio, then it's 9600. If you hear tones
> it's 1200. I'm not familiar with the
> KAM+, but I run my KPC9612 unsquelched. That is with the
> squelch open all the way. Even if the KAM+ can't run unsquelched
> opening up the squelch shouldn't affect your receive. There's
> a setting for this on the 9612.
>
> (It's possible, but not really certain, that your squelch is
> slow, and is cutting off the beginning of packets -- but it's
> something to check.)
>
> I agree, that it sounds like it's wired up right, if you see the
> 'receive LED' light up when you unsquelch. Hmm.
>
>
>
>
------------------------------
End of Ham-Digital Digest V2000 #98
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