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Re: LF: Re: Experimental software for WSPR-8 and -32

To: <[email protected]>
Subject: Re: LF: Re: Experimental software for WSPR-8 and -32
From: "Graham" <[email protected]>
Date: Sat, 22 Sep 2012 21:46:22 +0100
Importance: Normal
In-reply-to: <[email protected]>
References: <7F2208077DA448F78F384AF5B55DECA0@White> <[email protected]> <[email protected]> <829FB31FADAD4D4682EC509D2416C9F4@AGB> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Yes , Marco
 
 The  user  interface  is  indeed simple  , and the  equipment/system  over  heads  are  minimal , also  can add,  the  system was  designed to  allow access  to  data  for  the  many   CW  and  QRSS    transmitters on 136/500  .... however   the DSP  engine  is where  the  real   work is  carried out  , (under wraps of  course)  , the  low level  of false  decodes  and  s/n   levels , gives  a  insight  to the  development  in this  area ,
 
No  time  locking
No  sound  card  calibration
Lax  frequency  stability  requirements
OOK or  FSK   may  be  used 
 
The  On/Off keying  has benefits  other   than allowing  access via simple  Tx systems , it  gives  immunity  to  Doppler  spread  and  allows  the  averaging of the  data to be  used for  detection  , whilst  embodying   non-liner  routines  to eliminate static crash  problems .  it not being possible to  'loose'  lock  , due to the  coding scheme .  performance  on vhf  is  also significant  and the  system has been  included  in the  next  generation  of  vhf smart beacons.   
 
I think  the difference  between   data  demodulation  and carrier detection  are often  blurred , Markus   correlation  process  is  notable , with a  10 dB gain, however , the  Tx  pattern  is  detected  / compared  against 'known  reference'   , the  same  during the  testing  of  the  OP4 Hr , 8k audio  mode ,  at   -50 dB  was  10 dB sort  of the  spec-lab   detection  level  , but  again that  was a   data / carrier comparison , 8K has yet to  be  seriously   air-tested , its  quite  possible  , Stefan  will  achieve considerable  range , if he transmits  at the  previous  test  levels  ,  due to  the  long tx pulses , the  Op4 Hr   signal , also  shows  on spec-lab , so  test  data  is not  lost  if  decode  fails.
 
 
As to  what is  better , that  remains  to  be seen under  operational  conditions , Jose  is  quite  confident  the  OP on/off  system is  fit  for  purpose and  predicts a  practical  gain  of  only   -3 dB   from a  change  to  the  modem to  mfsk  or  psk , ( theoretical   levels  are  -6 ) but  these  do  not  take realistic path variations  into  account ,  exchanges have  taken place  on this  subject , a psk  version  could  be some  -5/6 dB better , but then  access  by  all  but very  few   MF/LF  stations  would  be  possible ,
 
The  benefits  of the  combined  data processing  and modulation  scheme   can  be  demonstrated to  off  set the  dB losses 
 
73 -G..
 
 
 
 
 

Sent: Saturday, September 22, 2012 8:38 PM
Subject: Re: LF: Re: Experimental software for WSPR-8 and -32

hi,

"simple" =
- modulation ON-OFF , no needs for linear P.A.
- no precise timing (= little beacons stand_alone. no PC.)
- TX only 50% on. (to take in mind when compare whith other "continous" mode at parity of output power.)
- the coding scheme is more robust than WSPR.

73 de Mauro IK1WVQ


At 17.36 22/09/12, you wrote:
Interesting  ...
 
Define  'simple'  ?
 
G..

From: IK1WVQ Mauro
Sent: Saturday, September 22, 2012 4:21 PM
To: [email protected]
Subject: Re: LF: Re: Experimental software for WSPR-8 and -32

Hi to all,

only a question to the experts:

is the SLOW WSPR better than the simple OPERA-32 ???

73 de Mauro K1WVQ




At 16.57 22/09/12, you wrote:
Hi Markus, LF,

It works! First reception of DF6NM in WSPR-8 here.

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2012-09-22 14:40   DF6NM   0.137538   0   0   JN59nj   0.5   DK7FC/8   JN49ik   175   272 
 2012-09-22 14:30   DK7FC   0.137499   +13   0   JN49ik   1   DK7FC/8   JN49ik   0   0

I have used a virtual audio cable, with success.


For those who still try without success, here is my description in simple words.

If your RX is a HF TRX at 136 kHz dial setting, then the tone of DF6NM appears at 1440 Hz, the tone of DK7FC appears at 1430 Hz.

The microphone input is used and it must be defined as the standard audio input device. This is important since the SounInput program related always to the default input.

Then soundinput generates the audio file and replays it in SoundOutput.

SoundOutput replays it to the standard audio output device, which is the virtual audio cable 1 for me. So VAC1 must be defined as the standard output device!

The sound input of the WSPR software must be set to VAC1 too.

The file wspr-8_rx.bat must be edited. If the BFO frequency in the WSPR software is 1500 Hz, then this value must be inserted for fc in the row for the soundoutput settings.

Set the value for fc for soundinput (the row below) to 1450 Hz and save the file.

Then double click wspr-8_rx.bat and wait some minutes. You may watch the small souninput and soundoutput windows...

Hope it works for others as well now.

73, Stefan7DK7FC


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