We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: Digital net on 27635 kHz - ROS mode on 27.635 MHz  (Read 2321 times)

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Digital net on 27635 kHz - ROS mode on 27.635 MHz
« on: June 04, 2017, 1430 UTC »
For a few years now, a digital network using ROS mode operates on 27635 kHz. Stations are mainly in Europe and use "Alfa-Tang" style callsings with numerical prefixes. Read more in this article ROS network on 27635 kHz on my blog.

« Last Edit: August 26, 2019, 1532 UTC by R4002 »

Offline R4002

  • Moderator
  • DX Legend
  • *****
  • Posts: 2524
    • View Profile
Re: ROS data mode Digital net on 27635 kHz
« Reply #1 on: June 04, 2017, 1923 UTC »
Interesting post, I've noticed digital nets on 27500 kHz USB / 27.500 MHz USB as well as what seems to be the most common European CB band ROS frequencies, 27235 kHz USB and 27245 kHz USB / 27.235 MHz USB and 27.245 MHz USB mode.

I've monitored PSK31 on 27500 kHz in the past, and have come across digital modes (nearly always ROS digital mode) on 27235 and 27245 while browsing through UK and mainland Europe based remote SDR receivers. 

Always glad to know there's digital activity on 11 meters, in the form of PSK31, ROS, or even digital SSTV.
U.S. East Coast, various HF/VHF/UHF radios/scanners/receivers

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #2 on: June 05, 2017, 0139 UTC »
27245 is also active with digital traffic. On this frequency they use SIM31, but traffic levels are low. 27700 is always busy with SSTV (analog) when the band is open.

Info about SIM31: http://www.sim.on2vhf.be/.


Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #3 on: July 22, 2018, 1409 UTC »
A nice Es opening today with European digital trafic on 27635 kHz, from Maidenhead squares JN and JO.

See here for a PSK-reporter map: Still active: ROS network on 27635 kHz.


 

Offline Josh

  • DX Legend
  • ******
  • Posts: 3274
    • View Profile
Re: Digital net on 27635 kHz
« Reply #4 on: July 22, 2018, 1731 UTC »
ROS mode is one of my favs. I was using it during the arrl fiasco when they deemed it spread spectrum and thus verboten for use by Americans. Works great! I should make an interface for the cb and see if I can get out. I'm DX122 an I'm back quiet!
Conveniently located near Vincennes Indiana.

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #5 on: April 27, 2019, 0706 UTC »
Today the frequency 27635 kHz is active with some statons from Europe, mainly France. In addition I received a weak ROS4 signal from station 153E222 in Rayong, Thailand at 0701 UTC.

« Last Edit: April 27, 2019, 0709 UTC by SV1XV »

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #6 on: May 26, 2019, 0945 UTC »
11m ROS frequency 27635 kHz is open today to Europe via Es (sporadic E) propagation:

RX8: 09:38 @ 7.8 Hz: Beacon de 14RC026 in JN03gh 14RC026@gmail.com (BRM) <CRC-OK> -5 dB  2032 km   27.635 Mhz
RX8: 09:42 @ 3.9 Hz: Beacon de 14RC026 in JN03gh 14RC026@gmail.com (BRM) <CRC-OK> -7 dB  2032 km   27.635 Mhz
RX8: 09:49 @ 89.8 Hz: CQ de 14OCF77  <CRC-OK> -16 dB  2042 km   27.635 Mhz

RX8: 10:05 @ -23.4 Hz: Beacon de 14RC026 in JN03gh 14RC026@gmail.com (BRM) <CRC-OK> -16 dB  2032 km   27.635 Mhz
RX8: 10:17 @ -19.5 Hz: CQ de 13LR225  <CRC-OK> +5 dB  1525 km   27.635 Mhz
RX8: 10:33 @ -78.1 Hz: CQ de 30RE107 IM76LL  <CRC-OK> -16 dB  2539 km   27.635 Mhz
RX4: 10:49 @ -2.0 Hz: CQ de 47DX101  <CRC-OK> -20 dB  2155 km   27.635 Mhz

« Last Edit: May 26, 2019, 1051 UTC by SV1XV »

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #7 on: May 26, 2019, 1713 UTC »

20190526-11m-ROS par SV1XV, on ipernity

Map on PSK reporter showing freebander signals I received today in ROS mode on 27635 kHz.

 

Offline Brian

  • Sr. Member
  • ****
  • Posts: 290
  • Ireland
    • View Profile
    • Email
Re: Digital net on 27635 kHz
« Reply #8 on: May 26, 2019, 1922 UTC »
Here in Europe there was plenty of activity on 26/27 Mhz, Sounded mostly German and possibly French and Italian.

Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #9 on: May 28, 2019, 1801 UTC »

20190528-11m-ROS par SV1XV, on ipernity

Map on PSK reporter showing freebander signals I received today in ROS mode on 27635 kHz.


Offline SV1XV

  • Full Member
  • ***
  • Posts: 192
  • Athens, Greece
    • View Profile
    • SV1XV blog
Re: Digital net on 27635 kHz
« Reply #10 on: August 25, 2019, 0800 UTC »


Map on PSK reporter showing freebander signals I received today, August 25, 2019, in ROS mode on 27635 kHz. Most traffic is from Germany and France.

Quote
RX8: 07:42 @ 43.0 Hz: CQ de 14FRS3002  <CRC-OK> -16 dB  2010 km   27.635 Mhz
RX8: 07:50 @ -46.9 Hz: CQ de 13AT162  <CRC-OK> -12 dB  1937 km   27.635 Mhz
RX16: 07:50 @ 23.4 Hz: CQ de 14DA049  <CRC-OK> -4 dB  2203 km   27.635 Mhz
RX8: 07:59 @ -39.1 Hz: CQ de 13AT162  <CRC-OK> -13 dB  1937 km   27.635 Mhz
RX16: 08:16 @ 23.4 Hz: CQ de 14DA049  <CRC-OK> -16 dB  2203 km   27.635 Mhz
RX8: 08:17 @ 27.3 Hz: CQ de 13OP020  <CRC-OK> +4 dB  1774 km   27.635 Mhz
RX8: 08:19 @ -93.8 Hz: CQ de 13SE555  <CRC-OK> -7 dB  1685 km   27.635 Mhz
RX8: 08:20 @ -82.0 Hz: CQ de 13SE555  <CRC-OK> -7 dB  1685 km   27.635 Mhz
RX8: 08:22 @ -62.5 Hz: CQ de 13SE555  <CRC-OK> -12 dB  1685 km   27.635 Mhz
RX8: 08:23 @ -125.0 Hz: CQ de 13OP020  <CRC-OK> +5 dB  1774 km   27.635 Mhz
RX4: 08:24 @ 31.3 Hz:  <CRC-OK> -24 dB  27.635 Mhz
RX16: 08:26 @ 31.3 Hz: vuv OFπzπlt <BAD-CRC> -18 dB  27.635 Mhz
RX8: 08:27 @ 54.7 Hz: CQ de 13OP020  <CRC-OK> -8 dB  1774 km   27.635 Mhz
RX8: 08:31 @ 62.5 Hz: CQ de 13OP020  <CRC-OK> +3 dB  1774 km   27.635 Mhz
RX16: 08:39 @ -46.9 Hz: CQ de 13SE555  <CRC-OK> -2 dB  27.635 Mhz
RX8: 08:43 @ -15.6 Hz: CQ de 13AT162  <CRC-OK> -8 dB  1937 km   27.635 Mhz
RX4: 09:12 @ 29.3 Hz: CQ de 19'6cdLN <CANCEL> -24 dB  27.635 Mhz
RX8: 09:21 @ 82.0 Hz: CQ de 13OP020  <CRC-OK> -12 dB  1774 km   27.635 Mhz
RX16: 10:07 @ -39.1 Hz: CQ de 13SE555  <CRC-OK> -10 dB  1685 km   27.635 Mhz
RX8: 10:08 @ -19.5 Hz: CQ de 1 mp <BAD-CRC> -18 dB  27.635 Mhz
RX8: 10:11 @ -35.2 Hz: CQ de 13SE555  <CRC-OK> -5 dB  1685 km   27.635 Mhz
RX8: 10:17 @ -43.0 Hz: CQ de 13SE555  <CRC-OK> -4 dB  1685 km   27.635 Mhz
RX8: 10:17 @ 15.6 Hz: lkn˛ Xtnl ® tnet!14F5901  S/Nΐ uieϊsnuib  n lφs et u <CANCEL> -20 dB  27.635 Mhz
RX8: 10:37 @ 15.6 Hz: CQ de 14F5901  <CRC-OK> -15 dB  2064 km   27.635 Mhz
RX16: 10:40 @ -70.3 Hz: CQ de 13SE555  <CRC-OK> -8 dB  1685 km   27.635 Mhz

« Last Edit: August 25, 2019, 1048 UTC by SV1XV »