Test of  ROS   100 Mf Mode  tonight 

Thanks to  all  who  supplied  information of there respective 500 KHz   permitted transmission bandwidth.

After  some negotiation ,  Jose has  coded  a 100 Hz of his  ROS  data  software , this  now  gives the  system an    ‘MF’   mode operating  inside the  100 Hz  licence conditions

The 7 baud  mode is a  live  keyboard mode , being  fast enough to  maintain a  reasonable qso  speed , with  selectable  afc  range

The  1 baud  mode is perhaps  more  of  a  beacon mode , but  offers  enhanced performance  and is perhaps a  contender to the  conventional  QRS/S  modes

Transmission of the  mode  requires  the  traditional  audio  to  rf  translation , but as it’s a  single  carrier  system , non linear amplification systems may be deployed.

This is the  first  custom built data   mode  resulting  from the  interest and  participation of  monitoring and  active  stations ,  of a   transmission  system experiment  undertaken on 500Khz  facilitated by  the  OFCOM issued  UK experimental research  permit

The  software  may be  freely  downloaded from  http://rosmodem.wordpress.com/

TX / RX  set :::   502.000 KHz  USB 

Carrier centre frequency   will  be   503.000 KHz   +/-  49 Hz

Many thanks'  to all

Graham

G0NBD