Oh there are perhaps several ways to determine robustness...but in all cases, you need a stable test medium...in this case a simulator.
You can take text or binary file and send the transmitted signal through a simulator and measure the output. This can be the number of errors or simply counting the number or character errors in a text file (see http://www.johanforrer.net/SIMULR/index.html and http://www.johanforrer.net/hfpsk.htm ) With many simulators you can set the signal level and "band" conditions such as a Poor CCIR Channel and a SNR of -5 dB. The Poor CCIR Channel is a specified set of signal/band conditions and of course the SNR is the ratio of the signal to the noise. Thus for a Poor CCIR Channel (generally what you "expect on HF) and a signal that is 5 dB below the noise, you might not expect any signal recovery. However, there are several digital modes that can recover almost 100% of the transmitted data under those conditions. The whole idea (at least for amateur radio operators) would seem to be the use of a computer or new hardware digital modes in recovering as much data possible from very weak signals. Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 11, 2006 4:43 PM To: [email protected] Subject: RE: [digitalradio] Initiating QSO with ALE then PSK31 or Olivia T exting, Other Traffic I plead ignorance (much!). Can you tell me how one measures "Robustness" and assigns a discreet value to it? It seems to refer to communications reliability, but I don't see how that can be assigned a discrete value, with the inherent random factors that are present. Help Bill-W4BSG At 10:02 AM 7/11/2006 -0500, you wrote: >Hopefully someone can answer this question. > >What is the robustness (measured) and throughput for the newer digital modes >used for keyboard-to-keyboard operation. > >I know what it is for PSK31, PSK63, MFSK8/16, MT63...but what about all the >other modes? >Can someone provide a list? > >I would think that for any amateur radio communnications you would want to >use the most robust mode with good keyboard-to-keyboard as well as file >throughput. > >The two modes that come to my mind are MFSK16 and MT63. MT63 might not be a >good choice because of the latency. G4HPE has shown that MFSK16 is almost >as robust as MT63 (in some cases perhaps more robust) and certainly is >faster than most amateur radio operators can type. > >Thus to answer the instant question, it would seem that the mode to use for >Ham ALE standards for digi text keyboarding, when QSOs are started via ALE >selective calling would be one that is the most robust (very robust) and has >a throughput that is faster than most amateur radio operators can type. > >73, > >Walt/K5YFW > > >-----Original Message----- >From: [email protected] [mailto:[EMAIL PROTECTED] >Sent: Tuesday, July 11, 2006 1:52 AM >To: [email protected] >Subject: [digitalradio] Initiating QSO with ALE then PSK31 or Olivia >Texting, Other Traffic > > >There is discussion going now on the HFLINK GROUP about >using some convenient Ham ALE standards for digi text >keyboarding, when QSOs are started via ALE selective calling. > >For example: HF ALE initiates the contact, then the >operators switch over to BPSK31 at 1500Hz audio center >frequency for texting. > >Other digi are being discussed, such as Olivia. > >For more information about ALE (HF Automatic Link Establishment) >http://hflink.com > >HFLINK GROUP: >http://groups.yahoo.com/group/hflink > >73---Bonnie KQ6XA > > >. > > > > > > > >Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org > >Other areas of interest: > >The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ >DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy >discussion) > > >Yahoo! Groups Links > > > > > > > > >[Non-text portions of this message have been removed] > > > > >Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org > >Other areas of interest: > >The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ >DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) > > >Yahoo! Groups Links > > > > Bill Aycock - W4BSG Woodville, Alabama Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Check out the new improvements in Yahoo! Groups email. http://us.click.yahoo.com/6pRQfA/fOaOAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
