Hello John I was realy waiting for this possibility. Ik will find some stations overhere to do the testing. HR-PE2KFA/HC1AKP 73 Karel 2012/3/20 John Douyere <vk2eta@xxxxxxxxx> > Hello Pskmail operators, > > I am ready to send, off list, a few copies of a special alpha Fldigi with > new modes for testing. > > This first batch of new modes is targeted specifically at the fast FM > (normally VHF/UHF) links as they require a clean bandwidth of up to 2400Hz > and will suffer badly in the standard SSB passband. So please do not use > the wider ones on HF. > > Also note that their baud rate is above the Amateur HF bands Baud limit in > the USA for all but two of the PSK modes. > > Note that I am separately preparing a USA HF Amateur version with only > modes below 300Baud and one for HF outside of the USA with faster Baud > rates. > > In this version, the top speed provides 3200 words per minute or 19200 > characters per minute (using the Fldigi definition). In tests I got a 17124 > characters text file to be downloaded in just under one minute in > compressed format, including repeats and ARQ overheads, so I think this > could be interesting. > > Unfortunately as this point I have not been able to get my existing > version of the Windows cross-compile to work, so it is for Linux only until > I get this to work. > > Instead of creating new mode designations I have simply re-mapped the > existing list of modes we use for Pskmail into a new set. > > That has the advantage of making the tests simple by just using the > temporary Fldigi program on both sides without any change in Pskmail. All > features will be the same including the configurable mode list. The only > drawback is that the timeouts are still related to slower modes so will be > in some cases way too long (like 30 seconds for the PSK63 -> PSK1000R > mode). But the objective is to review the modes not the Pskmail performance > itself. > > Of course these modes are usable with FLARQ of the NBEMS suite. > > I expect to have about 5 to 6 new modes from the list below retained in > the final "FM implementation". They will then get their new designation and > RSIDs. > > All these final modes will also be integrated in the Pskmail V2 > (integrated Java modems) and in the Android version of Pskmail (they > already run on my HTC Desire). > > I have arranged these test modes in a similar order of robustness as the > ones they replace. > > Here is the mapping: > > Original mode New Temporary Mode > Speed Bandwidth (-3dB) > > PSK63 1 Carrier PSK1000R > 880WPM 1000Hz > > PSK125 1 Carrier PSK1000 > 1600WPM 1000Hz > > PSK250 6 Carriers PSK250 > 2400WPM 2000Hz > > PSK500 2 Carriers PSK1000 > 3200WPM 2400Hz > > PSK125R 2 Carriers PSK500 > 1600WPM 1200Hz > > PSK250R 2 Carriers PSK1000R > 1760WPM 2400Hz > > PSK500R 14 Carriers PSK125 > 1540WPM 2400Hz > > I have also re-mapped the MFSK and THOR modes the following way: > > Original mode New Temporary Mode > Speed Bandwidth (-3dB) > > MFSK16 MFSK64 > 240WPM 960Hz > > MFSK32 MFSK128 > 480WPM 1920Hz > > THOR8 THOR44-Double spaced > 156WPM 1600Hz > > THOR11 THOR44 > 156WPM 800Hz > > THOR22 THOR88 > 312WPM 1600Hz > > The MFSK64 mode is the same as the current one but that way we get to have > an RSID associated with it for our tests (the MFSK16 RSID). > > The double spaced THOR44 is targeted mostly at NVIS conditions (4 dBs > better than the single spaced one) so I don't think it will provide a > benefit for FM paths. > > The MFSK/THOR modes should be of most interest for poor FM links (where > the noise is high). > > In some Pskmail tests I did over VHF, the THOR modes were virtually as > sensitive in FM as in SSB (I think Skip Teller - KH6TY - has an article > in QST about this). > > Due to the required bandwidth I would suggest a waterfall audio centre > frequency of 1750 or 1800Hz for FM transmissions. > > These preliminary modes specifications are published in the Pskmail wiki > to respect the regulation. See http://pskmail.wikispaces.com/newmodes > > I have not made the source code available yet as it is preliminary but of > course it will be released under GPL in due course and I hope integrated in > the mainstream Fldigi. > > Could you please feedback the following information which is of most > interest to me: > > 1. Any issue with the software itself. > > 2. CPU load of the different modes on your computer (approximate average > and peak value - use the "top" command in a terminal). > > 3. The modes that Pskmail mostly settle on, the ones it has problems with > and what were the conditions of the test (signal strength, quieting etc...). > > 4. More advanced: when frames are damaged, does it tend to be in > the beginning, the middle or at the end? > > From my Pathsim tests and initial field trials I would bet on the > following set: PSK1000R, 2 x PSK1000R and 2 x PSK1000 as a useful mode list > for FM transmissions, plus a couple of FSK modes, but let's see what you > find out in the field. > > To get a copy, email me off list at <my callsign> at gmail dot com > > Have fun, > > All the best, > > 73, John >