HFU HF Underground
Loggings => 10/11 meters => Topic started by: SV1XV on June 04, 2017, 1430 UTC
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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 (http://sv1xv.blogspot.gr/2017/06/ros-network-on-27635-khz.html) on my blog.
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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.
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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/ (http://www.sim.on2vhf.be/).
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A nice Es opening today with European digital trafic on 27635 kHz, from Maidenhead squares JN and JO.
See here for a PSK-reporter (https://pskreporter.info/) map: Still active: ROS network on 27635 kHz (http://sv1xv.blogspot.com/2018/07/still-active-ros-network-on-27635-khz.html).
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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!
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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.
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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
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(http://cdn.ipernity.com/200/84/52/48668452.1269c1f7.640.jpg) (http://www.ipernity.com/doc/777361/48668452)
20190526-11m-ROS (http://www.ipernity.com/doc/777361/48668452) par SV1XV (http://www.ipernity.com/home/777361), on ipernity
Map on PSK reporter (https://pskreporter.info/pskmap.html) showing freebander signals I received today in ROS mode on 27635 kHz.
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Here in Europe there was plenty of activity on 26/27 Mhz, Sounded mostly German and possibly French and Italian.
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(http://cdn.ipernity.com/200/22/72/48682272.9584c0f6.640.jpg) (http://www.ipernity.com/doc/777361/48682272)
20190528-11m-ROS (http://www.ipernity.com/doc/777361/48682272) par SV1XV (http://www.ipernity.com/home/777361), on ipernity
Map on PSK reporter (https://pskreporter.info/pskmap.html) showing freebander (https://en.wikipedia.org/wiki/Freebanding) signals I received today in ROS mode on 27635 kHz.
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(http://cdn.ipernity.com/200/94/46/49049446.534615ca.640.jpg) (http://www.ipernity.com/doc/777361/49049446)
Map on PSK reporter (https://pskreporter.info/pskmap.html) showing freebander signals I received today, August 25, 2019, in ROS mode on 27635 kHz. Most traffic is from Germany and France.
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
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I am actually noticing some ROS on 27635 around 1500 UTC 12 Jul 2020. First time I have seen it, I think.