From Graham, G0NBD:

First qso on 500 kHz using ros , G0NBD and G4WGT , initially using 500/16 and then eme , reducing tx power , the level that the eme mode started to fail was in technical terms ‘just silly’ reducing the tx to 3 watts carrier power then via a 20 dB attenuator down to 30 mW to a 35 ft top loaded Ae that needs round 50/75 watts to produce 100 mW erp , ie approx 500 : 1 reduction …….. reception 30 miles away by a similar Ae , then produced 100 % copy , depending on local noise level …

Later in the evening , M0BMU called G0NBD at 500/8 , a range of 200 miles , then follower at 100% qso over some 30 mins ending round 0010 local time , one final tx at 500/16 was also 100% decode , even in deep QSO , to the point of no audio from the speaker, the mode remained in lock and kept printing , each station running 100 watts.

Outstanding mode Jose !

73 – G ..

Congratulations for the experiments, Graham, although ROS EME was not designed for HF. ROS1/500 would be a better option in that case.

Which is the wideband avaiable for a 500Khz Band Rig? Would be possible use 2250 Hz in the 500Khz band?

6 Responses to “FIRST QSO ON 500kHz USING ROS 30 April”

  1. José Alberto Nieto Ros Says:

    Hi Dany (mit02),

    Thanks for the report. But it is better you report to Alex, the creator of OmniRig:

    I cannot modify OmniRig.

  2. José Alberto Nieto Ros Says:

    Hi Danny (781),

    In the future all is possible. But, primarily, ROS 1 baudio is also a software that enable communications keyboard to keyboard (in this case for Hams with many patient), not only for sending your callsign, locator and bye bye.

  3. Dany Says:

    Hello ,an erreur in OM-rig for FT990 :
    4800-8-N and one there are 2 bit stop
    Thank for the nice developpement
    In French:
    Bonjour ,il y aune erreur sur la configuration du port FT990 il faut deux bits de stop.
    Cordialement SWL-Dany

  4. Dan Says:

    Very nice !
    Congratulations, this is the true spirit of ROS, and it will be nice to see more QRP contacts being logged.
    Jose, have you thought of putting in a receiver with some software to give a WSPR kind of facility to a website. This would allow stations to do direct comparisons and would be very interesting, especially using the EME modes on HF.
    Tnx es 73s

  5. José Alberto Nieto Ros Says:

    Yes Graham, if your transceiver has more than 500 Hz of WideBand is better ROS1/500 for that propose.

  6. Graham Says:


    Interesting on your comment 500/1 v EME , would you expect better results over range with the 500/1 ?

    Mode bandwidth is dependant on the country , the UK allocation is 501 to 504 accessed by special research permit attached to an existing full licence and has no restriction other than voice and interference to other ‘users’ , looking back, this was actually quite an accomplishment for the RSGB/OFCOM mf working group as many allocations made since are far more constrictive.

    In a 3 kHz band , due consideration to other users tends to limit the bandwidth of modes used , not that its not possible as it is ‘an experimental’ allocation simultaneous, eg dual mode tx is possible. >–jt2-tests <

    Other EU allocations have a BW of 100 Hz max, originally intending to allow CW but due to a slight miss understanding of the word ‘telegraphy’ actually enabled narrow band data, other allocations range from CW only to wider band allocation and allowing voice. There are also permits for beacon operation, which forbid the establishment of direct communications, being essentially broadcast only, located in the USA and the EU.

    Tnx – G .

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