5000km+ TEP opening on the 432 MHz band in the Indian Ocean - 23rd Apr 2024

 Back on the 8th of April 2024, I reported on the very first Trans-Equatorial Propagation (TEP) opening on the 144 MHz band from UAE to Reunion Island in the Indian Ocean. Since then, this has been pretty much a daily occurence and I have been keep a record of the openings.

On the 23rd of April 2024, A65BR in the United Arab Emirates (UAE) reports that his 432 MHz signal was heard in Reunion by FR4OO via TEP. The distance was in the region of 5160kms.

Reports of TEP openings on the 70cms are incredibly rare and it's really interesting to hear about this new report. In this case, it was only a reception report but it shows the potential of the path at 432 MHz.

The composite image above shows reception of the Q65 signal at -17dB as heard by FR4OO.

TEP at 144 MHz is common enough for stations in the right location but stations using 432 MHz are really pushing the limits at what's possible. There are many different propagation modes on 70cms but surely one that allows 432 MHz signals to propagated by the ionosphere must be one of the more unusual ones.

It would be good to see more stations experimenting with TEP at 432 MHz and seeing what it possible.

Link...
1) For more examples of long distance openings on the 70cms band, see my 432 MHz page.

First TEP contact at 144 MHz made from Mauritius - 9th Apr 2024

On the 9th of April 2024, 3B8FA in Mauritius made the first Trans-Equatorial Propagation (TEP) contact on the 144 MHz band from that country when he completed a contact with A65BR in the UAE. As the screen grab shows above, there was also a path to A71XX in Qatar.

This screen capture below from Oleg, A65BR shows the contact on the Q65 mode.

FR4OO on Reunion Island also had the same TEP as the previous day to A65BR, A71XX and 9K2GS.

Just to keep the report as complete as possible, there was also a path from FR5DN to Qatar...

Looking at the maps, there is almost certainly a TEP path from Madagascar (5R) north to Kuwait but it just needs someone to be active from that country.

Links...

1) See my 144 MHz page for more examples of long distance contacts.

First ever TEP contacts made at 144 MHz in the Indian Ocean - 8th Apr 2024

On the 8th of April 2024, a little bit of amateur radio history was made with the first ever TEP contacts on the 144 MHz band in the Indian Ocean.

Over the last few decades, Trans-Equatorial Propagation (TEP) contacts on the 144 MHz (2m) band have been reported from South America to the Caribbean area, from the southern part of Africa to the Mediterranean area and from the north of Australia to Japan. This is as far as I know, a first for the Indian Ocean.

Inspired by the recent TEP contacts from Namibia to the south of Europe, other radio amateurs are trying other potential TEP paths. On the 7th of April 2024, A65BR in the UAE reported reception of the signal of FR4OO on Reunion Island... see previous post. On the 8th of April, three successful contacts were made as shown above.

The contacts are similar to other recent TEP contacts... made in the late evening, approx 5200km north-south path, equidistant from the Geomagnetic Equator and using Q65 to handle the distortion and weak signals.

The first contact was made by Oleg, A65BR around 16:30 UTC...

Oleg, A65BR writes... "Today TEP to FR on 2m was amazing. Q65 QSO with FR4OO done. Never try before, looks like we have permanent channel via TEP on 2m. Signals are huge, CW can be easy."

Oleg continues... "Today a QSO took place without any problems, the opening lasted 2.5 hours, the signal rose to -2 dB, FR4OO also worked 9K2GS and A71XX. Tomorrow 3B8FA will join their side, I hope it will grow together. It all started at 16.20 utc, (20.20 local Umm Al Quwain) and until 23 pm. It’s interesting to try at 70 cm.

According to the terrain - FR4OO sees the ocean, but I don’t - I have 1000 km to the ocean and the Omani hills on almost the entire route. However, it doesn't hurt!"

Alex, SV1NZX reports... "FR4OO completes with 9K2GS, A65BR and A71XX on 2m. FR5DN hears A71XX for one period. Congratulations to all stations!!"

As Alex mentions, the signal from a second Reunion Island station (FR5DN) was also heard in Qatar (A7).

These are the spots from the DX Cluster...

A71XX 144192.0 FR4OO 16:56 08 Apr FT8 LL55rw - LG79rc Reunion Island
9K2GS 144192.0 FR4OO 16:53 08 Apr  Reunion Island

Analysis... If the recent TEP openings to Europe are anything to go by, these openings in the Indian Ocean should be almost a daily occurrence for the few weeks around the equinox. This path is probably there year after year but it just takes someone at either end of the circuit to try it.

Links...

1) See my 144 MHz page for more examples of long distance contacts.

5160km TEP opening at 144 MHz in the Indian Ocean from Reunion to UAE - 7th Apr 2024

With the success of the now almost daily TEP openings on the 144 MHz band from Namibia to Europe, it has encouraged others to try similar possible TEP paths.

On the 7th of April, Olen A65BR in the United Arab Emirates reported reception of the 144 MHz signal  from FR4OO on Reunion Island. The distance is around 5,160kms.

The screen grab above from A65BR shows several decodes of the Q65 signal. As far as I know, it was a one way reception report and a two way contact did not take place.

This is as far as I know a new TEP path and hasn't been reported before. Hopefully, it might encourage others to try some tests on the 144 MHz band.

Links...

1) See my 144 MHz page for more examples of long distance contacts.