Gerald and Paul,
I don't have the DUBUS article around. How exactly is the compression
done in SDR-1000? According to my understanding the compression will
increase the INBAND intermodulation distortion, unless the audio
spectrum is sliced to narrow "subbands" that are individually compressed
and then combined. Naturally, after the processing the final brick wall
filter is compulsory.
By the way, I miss the multichannel TX equalizer!
73,
Ahti OH2RZ
----- Original Message -----
From: "Gerald Youngblood" <[EMAIL PROTECTED]>
To: "'Paul Wade W1GHZ'" <[EMAIL PROTECTED]>; <FlexRadio@flex-radio.biz>
Sent: Thursday, February 09, 2006 4:40 PM
Subject: Re: [Flexradio] Fwd: PowerSDR Beta Preview 13 has been
Released.
One thing that is very different in the SDR-1000/PowerSDR from Leiff's
excellent article is that our final brick wall filter is AFTER all
speech
processing, including ALC. This means that it filters out most of the
splatter before it ever gets amplified. I verified this on a spectrum
analyzer yesterday at very high levels of processing and ALC
compression.
73,
Gerald
Gerald Youngblood, K5SDR
President
FlexRadio Systems
8900 Marybank Drive
Austin, TX 78750
Ph: 512-250-8595
Email: [EMAIL PROTECTED]
Web: www.flex-radio.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Paul Wade
W1GHZ
Sent: Wednesday, February 08, 2006 10:46 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Fwd: PowerSDR Beta Preview 13 has been Released.
anyone thinking about ALC or speech processing should read
"Speech Processing for SSB Transmitters" by Leif Asbrink,
SM5BSZ in the 4/2005 issue of DUBUS
73
paul
>Date: Wed, 08 Feb 2006 16:10:41 -0600
>From: "Eric Wachsmann - FlexRadio" <[EMAIL PROTECTED]>
>Subject: [Flexradio] PowerSDR Beta Preview 13 has been Released.
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>PowerSDR Beta Preview 13 has been Released.
>
>This release fixes the ALC problem. Please read the release notes
>carefully. Also, several good articles are linked below
about peak to
>average power ratio for the average male voice.
>
>Thanks to those of you that responded to Gerald's request
for bugs. We
>have a good list to work from now and will be working on
those issues
>before releasing v1.6.0. Please do not duplicate your
reports unless
>something about your original report has significantly
changed in this
>release (Preview 13).
>
>
>Eric Wachsmann
>FlexRadio Systems
>
>
>Download Installer:
>http://www.flex-radio.com/download_files/PowerSDR/Install/Pow
erSDR_Beta
>_
>v1.4.5_Preview_13.zip
>
>Source:
>http://www.flex-radio.com/download_files/PowerSDR/Source/Powe
rSDR_Beta_
>v
>1.4.5_Preview_13_Source.zip
>
>Release Notes:
>http://flex-radio.com/forums/viewtopic.php?t=1948
>
>SSB Power Article:
>http://flex-radio.com/forums/viewtopic.php?p=6376#6376
>
>
>
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