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ZL3AI > APRDIG 02.11.06 05:36l 154 Lines 4910 Bytes #999 (0) @ WW
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Message: 23
Date: Tue, 31 Oct 2006 08:24:41 -0800
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] *** TNC Test CD Update - Mirror Server Now
Available ***
It's misleading to call it an ISO if it has audio tracks, though. Will dd
copy audio tracks from /dev/cdrom?
Might be easier to have the .wav or .aiff files posted separately for
download.
Scott
N1VG
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Message: 24
Date: Tue, 31 Oct 2006 08:28:50 -0800
From: "Christopher T. Day" <CTDay_at_LBL.Gov>
Subject: RE: [aprssig] Re: *** APRS TNC Test CD Now Available ***
Updated Info
It turns out that the Nero version is working for me after all; I was
misunderstanding how the mixed mode CD would appear in the various playing
software. The CD Player does not appear in my Accessories/Entertainment
menu. [Windows XP Pro] I used the trick suggested on this list earlier of
using MediaPlayer to rip the disk, abort the rip, then go back and play the
tracks.
Chris - AE6VK
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Message: 25
Date: Tue, 31 Oct 2006 11:00:32 -0600
From: "Robbie, wa9inf" <mwrobertson_at_comcast.net>
Subject: Re: [aprssig] *** TNC Test CD Update - Mirror Server Now
Available ***
With the raw ISO images, most burners that I am familiar with, take right
off and you're there. Our problem, (mine), is not RTFM and I apologize.. I
had not see this method or heard of it, the dual CD I mean, so I learned
something again yesterday! Thanks...
Robbie
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Message: 26
Date: Tue, 31 Oct 2006 09:02:13 -0800
From: <scott_at_opentrac.org>
Subject: [aprssig] Service monitors
Can anyone recommend a good, affordable service monitor? I'm assuming just
about anything would be OK for setting deviation and such, but I also want a
spectrum analyzer and the ability to show recovered FM audio to examine
packet waveforms and analyze preemphasis. Operation up to 500 MHz would be
good, but I'd settle for 200 MHz.
The HP 8920A with appropriate options looks good - I just got outbid on
eBay, though. Guess I'll have to wait for another one to come around. I'm
hoping to find something under $2500. Might have got it this time if I'd
been about 10 seconds later on my bid.
Any suggestions?
Scott
N1VG
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Message: 27
Date: Tue, 31 Oct 2006 11:20:02 -0600
From: Gregg Wonderly <gregg_at_wonderly.org>
Subject: Re: [aprssig] *** TNC Test CD Update - Mirror Server Now
Available ***
scott_at_opentrac.org wrote:
>It's misleading to call it an ISO if it has audio tracks, though. Will dd
>copy audio tracks from /dev/cdrom?
>
>Might be easier to have the.wav or.aiff files posted separately for
>download.
I missed the dual mode part of the image discussion. I was thinking that
there would be mp3s on the disk to play as files. But, that would not make
it possible to hook up a simple CD player (older ones anyway) to play the
sounds into the TNC.
The cdrpack tools are still worth knowing about!
Gregg Wonderly
W5GGW
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Message: 28
Date: Tue, 31 Oct 2006 12:23:47 -0500
From: Steve Huston <huston_at_srhuston.net>
Subject: Re: [aprssig] *** TNC Test CD Update - Mirror Server Now
Available ***
On 10/31/2006 12:20 PM, Gregg Wonderly wrote:
>>Might be easier to have the.wav or.aiff files posted separately for
>>download.
>I missed the dual mode part of the image discussion. I was thinking
>that there would be mp3s on the disk to play as files.
I don't remember enough about the MP3 algorithm, except that it's
definitely a lossy compression - I don't know how that would work for an
audio data stream, might mess things up enough to skew the results.
Though, FLAC is lossless, but even less things can play that.
--
Steve Huston - W2SRH - Unix Sysadmin, Dept. of Astrophysical Sciences
Princeton University | ICBM Address: 40.346525 -74.651285
126 Peyton Hall |"On my ship, the Rocinante, wheeling through
Princeton, NJ 08544 | the galaxies; headed for the heart of Cygnus,
(609) 258-7375 | headlong into mystery." -Rush, 'Cygnus X-1'
------------------------------
Message: 29
Date: Tue, 31 Oct 2006 09:32:10 -0800
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] *** TNC Test CD Update - Mirror Server Now
Available ***
>thinking that there
>would be mp3s on the disk to play as files. But, that would
MP3s would be bad in this case. They get their compression by quantizing
the signal to fit in a given bitrate, using a psychoacoustic model to decide
which components can be discarded without being noticeable. It might SOUND
ok, but you're going to totally mangle AFSK. That's why it's got to be
..wav, .aiff, or some other lossless format.
Scott
N1VG
------------------------------
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End of aprssig Digest, Vol 28, Issue 31
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