Ed wrote:
Are there any communications engineers in this group that can
give us some idea whether a useable quality digitized voice can be
sent over a 2.5 KHz wide HF channel with SNR comparable to or less than
what is required for analog voice?
I was thinking about this today Ed. I'd
Title: Message
When you
set the slider for the mic (or line) input, you have to be sure you're in the
"recording" area and not the "playback". When you open the volume control from
the taskbar, click on "Options", then "Properties", and check the box that says
"Recording". This opens a
nope, I got a Kam about $10 last year conversion from UK money to dollars, nobody wants packet radio tnc's but the other multimode tnc's like the pk232 mbx are still trying to be sold at high prices...I think the Kam etc are great, I had thought of hooking a couple up on 466 Mhz and leave
I was copying Gerhard OE3GBB on Sunday when he switched from MELP to
another codec to help a person that could not use MELP. The non-MELP
codec was no where near as good as MELP but still quite good. I did
not notice if it took less SNR but will play around today with the
different codecs.
Yep, that I knew, as I have used this for other types of interfacing
with voice and it worked fine. I did expect some bits and pieces coming
through once in a while from the speakers, but never did hear anything
even though it would light up all the states and even do an MSC lock
for brief
Even though I am not an engineer, we know from P-25 that digital voice
transmissions drop out before analog completely goes into the noise and
it is my understanding that the narrowest BW they use is 6.25 KHz. And
that is primarily for VHF/UHF frequencies that do not have the problems
we have
Tony wrote:
Ed wrote:
Are there any communications engineers in this group that can give
us some idea whether a useable quality digitized voice can be sent
over a 2.5 KHz wide HF channel with SNR comparable to or less
than what is required for analog voice?
I was thinking about
Even though I am not an engineer, we know from P-25 that digital voice
transmissions drop out before analog completely goes into the noise and
it is my understanding that the narrowest BW they use is 6.25 KHz. And
that is primarily for VHF/UHF frequencies that do not have the problems
we
kd4e wrote:
I am puzzled as to why one digital signal works well under poor
signal conditions and another does not.
You have to define poor conditions somehow.
It may be noise, multipath, ionospheric doppler, fading, etc. Each one
produces a different impairment, depending on the modulation
Roger Andy...
I intend to do the same. I'm QRV on 14236.0 at 1445z
Tony KT2Q
- Original Message -
From: Andrew O'Brien [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Monday, October 09, 2006 8:08 AM
Subject: [digitalradio] Digital voice CODECS
I was copying Gerhard OE3GBB
ian parkinson wrote:
I think the Kam etc are great, I had thought of hooking a couple up on
466 Mhz and leave messages in a neighbours M.box for playing chess.
Do you mean PMR446?
If so, don't let the authorities catch you, as it's not legal to use
anything other than voice on PMR446...
-Original Message-
From: digitalradio@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of expeditionradio
Sent: Sunday, October 01, 2006 7:39 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] BPL-Busting Modes/Techniques
BPL-Busting Modes/Techniques
The Digital
--- In digitalradio@yahoogroups.com, Tony [EMAIL PROTECTED] wrote:
Roger Andy...
I intend to do the same. I'm QRV on 14236.0 at 1445z
Tony KT2Q
Tony and I had a great QSO today using digital voice in WinDRM on
7228 during local morning, approximately 300 miles apart, both using
--- In digitalradio@yahoogroups.com, Tony [EMAIL PROTECTED] wrote:
Ed wrote:
Are there any communications engineers in this group that can
give us some idea whether a useable quality digitized voice can
be
sent over a 2.5 KHz wide HF channel with SNR comparable to or
less than
what
Hi Rick,
Respectfully, since I already had this dialogue with Mr. Hare, there
is no sense in him repeating it through you, especially when he isn't
around here to discuss it himself.
But let me point out, that I personally have designed DSP-based
products that do precisely what we are talking
I found the specifications. The spec used for broadcast DRM can be
found here:
http://webapp.etsi.org/exchangefolder/es_201980v020101p.pdf
The WinDRM spec can be found here:
http://www.qslnet.de/member/hb9tlk/drm_h.html
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
--- In digitalradio@yahoogroups.com, Tony [EMAIL PROTECTED] wrote:
All:
I'll be QRV on Digital Voice tonight starting at 2330z (Monday Oct,
9). If
anyone would like to sked, I'll be in-and-out of the shack till
0600z.
73 Tony KT2Q
I'll wander between 7296 , 7291 kHz USB
7286 kHz
I think Ed made my argument much more succintly than I did. The only
thing he forgot was how any whitespace/holes in frequency or time
would be synchronized at both ends of a conversation.
It does no good to sync your transmissions to these whitespace/holes
in your end when the person on the
It is not so much that the package is different between voice and text
modes, but rather, the amount of data flowing through the link in a
given amount of time. In order to have voice transmissions with good
intelligibility and no breaks in the signal, you need a VERY robust
data link. The
Jim
I just copied KT2Q calling CQ about 2128Z on 14236 USB. When I did receive
DRM voice I was hearing a mixture of the voice and the noise input to the
sound card.
You need to mute the MIC audio on your sound card. That will stop the WinDRM
digital signal from making it to your PC speakers
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the digitalradio
group.
File: /Digital Voice/kt2q.mp3
Uploaded by : obrienaj [EMAIL PROTECTED]
Description : KT2Q Digital Voice QSO (WinDRM)
You can access this file
Andy,
You should upload your audio -- I think it's darn good!
Tony KT2Q
- Original Message -
From: Andrew O'Brien [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Monday, October 09, 2006 9:33 PM
Subject: [digitalradio] Re: New file uploaded to digitalradio
AFter having a
What???
- Original Message -
From: kd4e [EMAIL PROTECTED]
One could observe the same paradox about virtually
every religion on earth at certain moments in history
and/or in certain geo-political locales.
The goal of the statement about peaceful Islam is
to empower
I assure you it is possible to make BPL-Busting Modes for ham radio.
Whether or not Mr. Hare and his ARRL buddies want hams to do it, and
are creating a smoke screen to discourage it, is technically moot.
Bonnie KQ6XA
Some of this is strategic posturing, same as saying
that Islam is a
Sorry, Andy. KD4E is an experimental AI application I've been
developing. The recent HP spying scandal combined with a tract on
religious freedom combined to expose a defect in its deduction
module. Its fixed in the next release...
73,
Dave, AA6YQ
--- In
I have to agree with Andy. It has the mellower sound due to the wider
frequency response, but it has the odd digital sound at times.
For those of you who are active with D-Star, do you find this to be the
case, even with the high data rates? I have heard some comments
(complaints?) about the 2
Think outside the technological box.
There are few unique patterns of human behavior.
Bonnie accused the ARRL technical folks of being
deceptive about the possibilities of BPL-busting
technology, she gave no reason for their behavior.
I was drawing a current events parallel as to
why sometimes
Looks like its working better now...
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, kd4e [EMAIL PROTECTED] wrote:
Think outside the technological box.
There are few unique patterns of human behavior.
Bonnie accused the ARRL technical folks of being
deceptive about the
Looks like its working better now...
73,Dave, AA6YQ
I'm like the old cheap 60's Japanese AM portable
radios.
When they didn't work quite right you gave them a
sharp rap to shake the excess wax out of a pot or
variable cap!
Time for my recharge cycle, e, beauty rest.
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