UZ7HO Soundmodem Updated Again - QPSK Modes Added

Jeff King jeff at aerodata.net
Tue Apr 21 07:15:05 PDT 2015


Wow... back to the future.  We were doing 4800/9600 QPSK/16 level PSK 25
years ago using audio fax modems.  See page 3:

http://www.tapr.org/psr/psr040.pdf



On Sat, Apr 18, 2015 at 10:10 AM, Bill <wa7nwp at gmail.com> wrote:

>
> Ok.  That does it.   I'm going to have the new QPSK modes running by the
> end of the weekend.
>
> Hopefully DireWolf does the same so we can do this on the RPI.
>
>
>
>
>
> Begin forwarded message:
>
> *From:* "'Stephen H. Smith' wa8lmf at aol.com [ui-view]" <
> ui-view at yahoogroups.com>
> *Date:* April 18, 2015 at 6:19:06 AM PDT
> *To:* UIview List <ui-view at yahoogroups.com>
> *Subject:* *[UI-View] UZ7HO Soundmodem Updated Again - QPSK Modes Added*
> *Reply-To:* ui-view at yahoogroups.com
>
> [18 April 2015]
>
> Another update to the UZ7HO Soundmodem soundcard software TNC was released
> today.    The latest version .81 has added QPSK modes at 2400, 3600 and
> 4800 baud.
>
> These modes use audio subcarriers just like the conventional 300 and 1200
> baud
> packet.  As a result, these faster modes can be used through the usual
> sound-card-interface & mic jack or dataport connection.  (Unlike the G3RUH
> 9600
> baud mode that requires direct DC connections to the transmitter modulator
> and
> receiver discriminator.)   Note that these new faster modes will work with
> most
> FM radios, but may be problematic with HF/SSB transceivers due to the
> limited
> bandwidth of the typical SSB transmit filter (only about 2.2-2.4 KHz).
>
> With these latest versions, the Soundmodem can now transmit and receive
> AX.25
> packet on:
>
> -  Classic 300, 600 or 1200 Hz baud FSK
>
> -  300, 600, 1200 and 2400 baud BPSK
>
> -  2400, 3600 and 4800 baud QPSK
>
> This makes the Soundmodem an exceptionally versatile "soft TNC" directly
> usable
> by UIview, APRSis32, APRSpoint, APRSplus or any other client that can
> provide
> an AGWpe-type interface to a soundcard TNC.   Looks like plenty of food
> for
> experimentation comparing the relative performance of these different
> modes.
>
> As usual,  I have repacked UZ7HO's original zip file distribution into a
> full
> Windows "wizard"-type  .EXE  installer.   Download it from my website at:
>
> .   <http://wa8lmf.net/miscinfo/#UZ7HO>
>
> =========== CHANGE LOG ===============
>
> SoundModem v0.81b changes:
> - Added QPSK 2400, 3600 and 4800 baud modes.
>
> SoundModem v0.80b changes:
> - Added new BPSK 2400 baud modem.
> - Little code optimization.
> - Fixed some minor bugs.
>
> SCM v0.78b changes:
> - Added new BPSK 300-1200 baud modes.
> - Reduced CPU load.
>
> SCM v0.72b changes:
> - Added the KISS ACKMODE support.
>
> SCM v0.71b changes:
> - Fixed "Frame Collector" operation with MAXFRAME greater than 4 and IPOLL
>   frames. By default it supports up to 6 frames into collector's buffer
> now.
> - Added "TXFrmMode" option (that was available in 9k6/19k2 version). It
> allows
>   to select the transmission mode of the frames.
>
>   If set "TXFrmMode=1" then it will repeat only one frame on each of REJ
> acks.
>   It can be useful in poor condition jointly with MAXFRAME up to 4. If
> another
>   station uses a TNC which can operate with "Frame Collector" this option
> can
>   improve a performance, especially on HF.
>
>   If set "TXFrmMode=0" then it will always repeat the block of the frames,
> of
>   which the number is limited by MAXFRAME. It can improve the efficiency in
>   good condition. Especially with TNCs without "Frame Collector" function.
>
>   By default this value is "1".
>
> SCM v0.69b changes:
> - Improved DCD reaction on the AX.25 flags and zeros stream.
> - Changed default filters settings for the modems.
> - Added KISS TCP-Server
> - Added KISS Optimization
> - Added transcription of NETROM and IP traffic in the monitor window.
> - Added some changes in L2 protocol.
> - Added IPOLL frames.
> - Fixed RNR frames processing.
> - Fixed waterfall bug under Linux (WINE).
> - Fixed some inessential errors.
>
> G3RUH SCM v0.16b changes:
> - Reduced CPU load.
> - Changed samplerate to 48000 by default.
> - Added 19200 baud G3RUH modem.
> - Added some features from latest SCM version.
> - Added "Non-AX25 filter" option. It blocks non-AX25 traffic through AGW
> interface
>
> SCM v0.57b changes:
> - Reduced CPU load.
> - Added option that disable waterfall in minimized state.
> - Added option of the application priority that improves the work of the
> modem
>   during peaks of CPU load (decreased gaps and stuttering sound during
> transmission).
>
> SCM v0.52b changes:
> - Improved MEM-recovery feature. That tries to recover corrupted frame from
>   the last frames buffer. It may help if the frames are often repeated,
> e.g.
>   supervisory frames. You can change the number of last packets in the INI
> file
>   (by default is "MEMRecovery=100"). Higher value may help on a very noisy
> path.
>
>   If you don't need to receive the short non-AX25 frames you can limit
> minimal
>   length of frame to 17 ("RawPktMinLen=17"). It will reduce the
> accumulation of
>   unnecessary frames in the buffer.
>
> SCM v0.51b changes:
> - Limited the number of bits for bit recovery operation (only for undefined
>   state at three different levels of threshold comparator).
>   WARNING! Test showed this option may cause additional erroneous CRC
> collisions,
>   so use it at your own risk. By default is OFF
>
> SCM v0.50b changes:
> - Added single bit recovery feature
> - Fixed transmission non-AX.25 frames to application (see option
> "NonAX25Frm"
>   in the INI file)
> ___________________________________________________
>
> Stephen H. Smith    wa8lmf (at) aol.com
> Skype:        WA8LMF
> EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
> Home Page:          http://wa8lmf.net
>
> Live Off-The-Air APRS Activity Maps
>    <http://wa8lmf.net/map>
>
> Long-Range APRS on 30 Meters HF
>    <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
> Posted by: "Stephen H. Smith" <wa8lmf at aol.com>
> ------------------------------------
>
> Please do not top post, and trim quoted text as much as possible.
>
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>
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>
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> download URL to... aprs2.net/APRServe2.txt
>
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> with PMapServer 9 can provide street level mapping for all of North
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> PMapServer is available for download on the UI-View website.
> However, Undertow Software is no longer selling new copies of
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> can get it registered.
>
> Users of Windows Vista, 7 or 8 should not install UI-View below
> Program Files. Instead, create a folder elsewhere. To view UI-View's
> built-in context sensitive help file, download and install WinHlp32.exe.
> http://www.microsoft.com/en-us/search/DownloadResults.aspx?q=WinHlp32.exe
>
> Useful hints and tips about setting up and using UI-View are
> available on Stephen WA8LMF's website.
> http://www.wa8lmf.net/aprs/UI-View_Notes.htm
> ------------------------------------
>
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