Radio Active

Radio Active

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This blog is an occasional 'diary' of my radio activity, what I have been up to, any interesting stations I have heard, experiments carried out and my thoughts on band conditions etc.


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ROS - latest QRG's etc

Digimode happeningsPosted by Sean Gilbert Tue, August 17, 2010 12:36:23
There has been an incredible amount of stuff written about ROS both good and bad. One thing that crops up time after time is the subject of which frequencies to use. Here is the latest list (as of today), taken from v5.0 of the ROS software. The first column denotes the suggested frequency and the second column is the mode or bandwidth to use. I would like to see options to use 500Hz on all bands, especially on 40 and 12m. The fact that there are now no less than 5 spot frequencies on 20m is likely to raise some eyebrows. Although ROS seems to work reasonably well, to my mind it is still not as good as some of the narrower band modes. The other thing that I find disconcerting is that there is an awful lot of pre-amble and 'aft-amble', when you hit the ptt button to stop the transmission a good 5-10 seconds pass before the tones stop and you are returned to receive (even if all the text in the box has been sent). I have just discovered that you can't change mode on some bands (like 15m, you are stuck on 2250Hz whether you like it or not, the only way out is to turn off CAT and change band to, say, 20m where certain frequencies allow 500Hz. Not a very flexible system and does not allow for easy experimentation. Using 2250Hz for all transmissions is not spectrum efficient! That said I am still using the mode and just adapting it to my own preferences as much as possible. Any way, here are the latest frequencies:


ROS QRG's (Aug 2010)

QRG Mode/BW

136kHz MF

502kHz MF

1838kHz 2250Hz

3598kHz 2250Hz

7055kHz 2250Hz

10144kHz 500Hz

14078kHz 500Hz

14091kHz 500Hz

14103kHz 2250Hz

14112kHz 2250Hz

18111kHz 2250Hz

21110kHz 2250Hz

24931kHz 2250Hz

28295kHz 2250Hz

50295kHz 2250Hz

144160kHz EME

144980kHz 2250Hz


15m (21110) has been quite busy, and I am seeing a lot of spots on the dxcluster (this is another area that is causing some bad press as it is generating a lot of spots because of it's autospotting routine).

You can download the latest version of ROS from the homepage: http://rosmodem.wordpress.com/



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