Tag Archives: beacons

OK0ER via Aircraft Scatter on 13 cm

October 22nd, 2018

As OK0EA was audible this morning on 23 and 13 cm I had a look for other, more distant beacons in OK. After noticing a very short and weak signal on 2320.9085 MHz, I monitored the frequency over a couple of hours and saw many doppler shifted traces, typical for aircraft scatter. Very soon I copied “…9DP…”, when a B777 crossed the path and was sure to see OK0ER in JN99DP in the waterfall diagram. At least 4 Airbuses A380 crossed the path one after the other, giving nice reflections.

OK0ER transmits 1.5 W into a slot antenna in 675 m asl. The distance is 722 km.


Queqiao S-Band Beacon received over 450000 km

August 23rd, 2018

Designed as a relay for the planned chinese Chang’e 4 misson to explore the far side of the Moon with a lander and a rover, the Queqiao probe has reached it´s final destination 60000 km behind the Moon. There it is in a halo orbit around  the Langrangian L2 point of the Earth-Moon-system. So it won´t be covered by the Moon, seen from Earth.

The signal of the S-band beacon is audible at about 2275.225 MHz. The used equipment is HDSDR software with an RTL-SDR-Stick with a 13 cm ATV Converter (LO=916 MHz), 13 cm LNA (Kuhne) at a 23/13cm and a dualband ringfeed in a 3 m dish.

Queqiao also carries a radio astronomy experiment for low frequency exploration in collaboration with dutch ASTRON. During the fly-by at the Moon two microsatellites Longjiang-1 (DSLWP-A) and Longjiang-2 (DSLWP-B) were released, to enter orbits around the moon. These satellites carry a radio astronomy experiment as well as amateur radio payloads. While Longjiang-1 went lost, Longjiang-2 is operating and can be monitored in the 70 cm band.

New Beacon SR1KOL in JO74SE

July 30th, 2018

After I noticed some spots for SR1KOL in JO74SE on 1296.960 MHz, I monitored the frequency using WSJT-X Wide Graph. About 400 Hz below the nominal frequency traces of a F1 signal can be seen, when airplanes cross the path to the beacon. The signal is not audible, but I am pretty sure, it is SR1KOL.

Traces of SR1KOL in JO74SE, “1000” = 1296.960 MHz. The strong signal at the very left is a birdie.

Some information can be found on the website of Polski Klub UKF: It is located on a high rise building in Kołobrzeg, 40 m above ground. The power is 3 W into a slot antenna. Beacon keeper is Andrzej, SQ1GU.

The video shows an A380 crossing the path between DJ5AR and SR1KOL. At minute 2:00 the plane crosses the first time and at minute 4:00 after a turn it crosses a second time. Mind the traces at 580 Hz in the waterfall diagram. The 1000 Hz mark corresponds to 1296.960 MHz.

Irek, SP5MX, who was involved in building the beacon and who repaired it recently, told me, the beacons reference is an OCXO withtout any GPS-lock. So possibly the beacon may transmit 400 Hz lower than defined.

At least in the morning of July 31st audible reflections could be heard via an Airbus A330. This time the 1000 Hz mark correspondents to 1296.9596 MHz.

After 10 seconds the noise becomes a kind of ‘musical’. Another 10 seconds later experienced ears can hear the tone.


New Beacon DB0MFI on 23 and 13 cm

June 18th, 2018

This morning I had a look for DB0MFI, a new beacon on 1296.940 MHz in JN58HW. It is audible with 529 constantly via tropo and peaking 579 via aircraft scatter. The power is 5 W into a 4 times stacked big wheel antenna.


In the afternoon I went for it on 2320.940 MHz. Faint reflections on some airplanes were audible and traces could be seen in the waterfall of WSJT-X Wide Graph:

New Beacon DB0WML on 13 cm

May 7th, 2018

The other day I noticed some cluster spots about a new beacon DB0WML in JO31MU on 2320.910 MHz. So I had a look for it today. Nothing via tropo, but nice reflections on airplanes.

At least I was bearing to an A380 in a distance of about 30 km at a height of 12 km with 33° elevation, to record this clip.

Also I was lucky to get a snapshot of this particular bird!

The beacon is runnung 1.5 W into a 10 dB slot antenna according the information in beaconspot.eu
The beacon is operated by DARC local chapter N40, keeper is Rudolf, DK8QU.

The screenshot shows DB0UX on 2320.900 MHz, DB0MJ on .904 and DB0WML on .910 in good Neighbourhood.

F5ZBM on Air again!

April 20th, 2018

The french beacon F5ZBM is on air again. I found it accidentally, when looking for other french beacons. It is at a new location in JN18MN near Paris transmitting on 1,296.8475 MHz. Nice to monitor it in Mainz via aircraft scatter over a distance of 406 km!

The keying is in F1 with a very narrow spacing. Power is 10 W ERP into a slot antenna, as can be seeen at BEACONSPOT.eu

Another view on F5ZBM in WSJT-X Wide Graph


OZ7IGY and friends

December 22nd, 2017

Tonight I monitored OZ7IGY on 2,320.930 MHz via aircraft scatter. It was nice to see other beacons appearing shortly in the waterfall diagram.

OZ7IGY and friends in time lapse

From left to right:
2.320.900: DB0UX, JN48FX, 105 km, tropo
2,320.910: DB0XY, JN51EU, 263 km, aircraft scatter
2.320.920: DB0VC, JN54IF, 509 km, aircraft scatter
2,320.930: OZ7IGY, JN55WM, 670 km, aircraft scatter

The dish was bearing 20° to OZ7IGY. The -3 dB beamwidth is just 3.2° on 13 cm.


G8MBU – JT65c Beacon via Aircraft Scatter

July 5th, 2017

After installation of new transverters for 23 and 13 cm with stabilized LOs a couple of months ago. I gathered some experience in using JT65C mode on EME. So I undertook a new attempt to receive and decode G8MBU via aircraft scatter today. As antenna I use a 3 m dish with a dual band ringfeed.

Path DJ5AR to G8MBU

The beacon is located at Cowes on the Isle of Wight, IO91IR37, 683 km from Mainz, JN49CV. It runs 2 W power into an omnidirectional dual alford slot antenna. The mode used is JT65c. Nominal frequency is 1296.800 MHz. To successfully decode the signal, the SSB dial should be set to 1296.7986 MHz, to get a tuning tone of 1400 Hz in WSJT.

There is a small window between the Isle of Wight and Mainz, where high flying aircraft can be “seen” from either places. But only a few airplanes cross the path within and fewer fly along the path. Reflections of G8MBU could be seen from time to time, but mostly too weak and too short to provide decodes. It took nearly 3 hours until the first decode happened at -22 dB and just some minutes later a second one appeared on the display at -21 dB:

1158 -22  4.0 1282 #* G8MBU IO90IR
1206 -21  3.9 1268 #* G8MBU IO90IR

In total I monitored G8MBU for 5 hours. The propagation conditions were normal today, no tropo at all.

Nice Tropo this Afternoon

December 20th, 2016

There is some nice troposheric propagation this afternoon. It looks promising for the NAC, IAC and UKAC this evening on 23 cm. When looking for DB0XY I saw this situation:

2016-12-20-14_00-23-cmHopefully it will last for some hours!