I must admit one of the best things about the on-off keyed Opera beacon/qso mode , are all the reasons it will not work
but its actually immune to Doppler spread and has afc routines to enable 'normal' sound cards and ham kit to be used .
Did anyone realize , that if standard 45 baud 2 tone rtty is is reduced in baud rate to the same as wspr , then it is only 6 dB short of the wspr system and that uses 4 mfsk ?
For those who would like to try the qso version of the opera system, the last version with the qso mode, 120 second tx time , -20 dB s/n and 15 chrs , is located at :-https://dl.dropbox.com/u/15990181/Opera ... 20Beta.zip
Ignore the requests to up-grade ! and have fun - any am/fm pmr set that can be keyed will send the mode ! fsk can also be used , as long as the 'mark' tone is inside the decoder pass band .
Otherwise ,download the latest version , the ROS data mode is also suited to VHF work and can be seen to be used to good advantage on 50 Mhz , being a free running qso mode with no time locking or tx time limitations , the latest versions are quite refined , after 3 years of development .( yes its that long !) There are no 4 meter spots on the psk-reporter , but these are showing 31/5 for 6 meters , im sure similar results could be obtained on 4 , ideal for /P as no web time locking is required for Opera or Ros
EA5AWF 4X4-2175 6m ROS 3298 kms 18:41:58
EC5CFV 4X4-2175 6m ROS 3260 kms 18:57:52
RA3ZSE IV3LWZ 6m ROS 1892 kms 18:42:37
EA5AWF G4MDH 6m ROS 1526 kms 16:53:10
EA5HCJ DK6SQ 6m ROS 1479 kms 17:11:03
30LAJ19 DK6SQ 6m ROS 1479 kms 17:10:24
EA5AWF IT9HZC 6m ROS 1397 kms 17:18:49
F4EJW EA5HCJ 6m ROS 1217 kms 17:19:40
EA5HCJ F4EJW 6m ROS 1217 kms 17:19:28
EA5AWF F4EJW 6m ROS 1202 kms 18:17:39