[CQ-Contest] contest recording

[Jan Erik Holm]

Yes Dale, look below.

I would say that the consensus is that one would need 1 GB
to be on the safe side.
I was just after rough figures, i e if we are talking a few
hundred MB´s or 1 or 2 GB´s, 2 Gigs would be on the super
safe side I guess.

73 Jim SM2EKM
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Can you compile/summarize and share the responses you received with the rest of 
us, Jan?

:-)

73,
dale, kg5u
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You can try the Ogg Vorbis compression codec that is better than mp3.

http://en.wikipedia.org/wiki/Vorbis

http://plus24.com/mp3-howto/mp3-howto.html

And programs like SOX to record an compress in background, in linux it's
easy cake, just a script.

73, fede.
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Hi Jim -

I use Writelog to record the contests.  The setting I use is MPeg-3 32kbs/24000 
hz 3kb/sec.

This will record a 48 hour contest in less than 800Mb and can fit on a CD.

In Writelog, you can click on a QSO and it will play.  However, I seldom listen 
to the recordings at any length.  Mostly, people want to hear how they sound.

I use an 800Mhz machine, but not the one I use for logging/dvk/etc.

GL and 73,

Tom W2SC 8P1A
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 From Tips and tricks page:

· Recording is done at 11025 Hz, 8 bit, mono (30 seconds = 250 kB, maximum 30 
MB/hour).

Recording uses about 1 GB per 24 hours (40−50 MB per hour). There are programs 
which can compress these wav files to MP3 files but if this can be done at the 
same time when giving CQ depends a lot on the computer used. A clunker will 
surely not do it. There is of course the possibility to do this after the 
contest. Enough harddisk space during the contest is necessary.

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Using typical MP3 compression  Writelog uses about 350MB for a 48 hour 
contest... I can look up my settings if you need them..but you can easily store 
a full 48 hours on a CD...
The qualtiy is adequate to hear things you missed real time..which is very 
disturbing when you review your UBN file.

73 Chas K3WW
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Jim,

Maybe someone replied already, but if not, here with WL I recorded the whole
of last years CQWW PHONE and it used about 200 Mbit.

73

Steve
GW4BLE
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Hi Jim,
Depends on your compression routine.  Using mp3, it is 3 MB/hour and
the number of QSOs doesn't matter because recording is on all the
time.  Without compression it is BIG file.
73,
Barry W2UP
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Hi Jan,

I use about 15 meg per hour for stereo, good quality recording for 720 meg,
which fits on one CD-R.

73, Ken, K6LA / VY2TT
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I use a computer running linux.  I use sox and lame
to do the recording.  The lame setting I have been
using that gives me the quality that I like uses a little
under 21 Mb/hour.  I restart the recordings at the top
of each hour using a cron job.  I have found it is
much eaiser to deal with 24 or 36 or 48  21Mb files
than it is to mess with one big file.

I am not an expert with lame ... but here is what I have been
using most recently with very good results.

sox -t ossdsp -w -s -r 44100 -c 2 /dev/dsp -t cdr - | \
lame --verbose -r -b48 --scale 3.5 - contest.mp3


Here is the IARU contest first hour:
http://www.kkn.net/~k5tr/audio/contests/IARU/2005/2005-IARU-K5TR_2005-07-09-12:00.mp3


There are more contests here:
http://www.kkn.net/~k5tr/audio/contests/

If you poke around in there you will notice that there are some
smaller and maybe larger file sizes - this is because I have been
playing with the lame settings.  Some use VBR and one or two are
mono recordings because I did not notice that I was not recording
in stereo.  I use stereo most of the time since I want to record
the two radio audio.

-- George Fremin III - K5TR
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Ett par gigas: ca 8kHz, 8 bit.

48x3600x8000x8 = 11.059.200.000 bits per channel per contest.

Divide by 8 to get Bytes.
Some 1.4 G/ channel.


73,
Jukka OH6LI
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Actually it is just the time the recording is on not by the QSO.  The
program just runs in the background.

In Sweepstakes last year I used a program called Audacity.  I don't recall
exactly how much space it took up but it was not staggering.

You need to adjust the sampling rate and bits to a reasonable rate so the
file is not huge but readable.  I will try to find the file size and repost
the size but I want to say around 200mb.

Mike
W0MU
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Dale L Martin wrote:
> 
>>
>> Jan Erik Holm wrote:
>>
>>> I´m woundering about how much HD space that might
>>> be needed to record a 48 hour contest, N1MM or WL
>>> software.
>>> I know it depends on how many Q´s one makes but if
>>> someone with experience just could give some ball
>>> park figures.
>>>
>>> 73 Jim SM2EKM
>>>