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ZL3AI > APRDIG 24.10.06 10:31l 67 Lines 2112 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 28 #1, 2/2
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Message: 11
Date: Sat, 30 Sep 2006 23:19:22 -0400
From: "Richard Amirault" <ramirault_at_verizon.net>
Subject: Re: [aprssig] Dumb tracker question
No, it has nothing to do with an internal magnetic compass. It has to do
with a GPS assuming that if it is traveling then it is traveling with the
"top" towards the direction of travel (and face up) so that the arrow
displayed on the screen is pointing toward the desired waypoint.
You would not, normally, hold a GPS in your hand with the display facing the
ground. You would not, normally, hold a GPS in your hand with the "top"
towards your stomach ("upside down")
If you setup a waypoint and the arrown screen and start moving forward the
GPS will indicate, using the arrow and a degree listing, a direction toward
the waypoint. If you stop and then do nothing but walk (or drive)
backwards, still facing the same direction as before, the arrow will switch
direction 180 degrees.
I've only seen this with GPS units that are handheld units, not 'hockey
puck' types. And it may not happen using a handheld with an external
antenna.
Richard Amirault N1JDU Boston,
MA, USA
n1jdu.org "Go Fly A Kite"
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Message: 12
Date: Sun, 1 Oct 2006 13:24:49 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] Software Defined Radios
Gudday
I am hoping I might hit the right people.
I have an need to look at the video signals coming out of my 1090 MHz
aviation receiver.
I tried using the sound card but it is only 44kHz sampling rate.
Are anoy of these software defined radios etc suitable for looking at and
decoding at a rate of at least 10 MS/s,
Cheers Andy
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
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End of aprssig Digest, Vol 28, Issue 1
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