Juan, ZP9HTL in Paraguay sent on some interesting information to me about his experience with Trans-Equatorial Propagation (TEP) on 144 MHz.
With TEP propagation, signals on the 144 MHz band usually cross the Geomagnetic Equator close to 90 degrees i.e. a right angle. This means that openings tend to happen to the exact same area when the band is open.
This can be seen as the TEP pipeline from Buenos Aires in Argentina to Bonaire, Curacao, Aruba & the Dominican Republic in the Caribbean. Likewise, stations in the south of Brazil have a pipeline to Puerto Rico & Guadeloupe.
For ZP9HTL, his pipeline from Paraguay is to Puerto Rico where he is often heard on SSB on 144.300 MHz.
Video... The following clip was sent to me by Juan.
It shows that what a TEP signal on SSB can sound like. Note the distortion and the very rapid flutter.
Remember, this is a signal on 144 MHz over a 5000km path!
Antenna... On 144 MHz, Juan is using an 11-element LFA Yagi.
DX-Cluster Spots... I have included below the DX Cluster spots for ZP9HTL from the Caribbean. As you can see, they are all from Puerto Rico and they range from the start of the TEP season in September 2021 to now, mid January 2022.
It's interesting to see that the TEP openings happen at pretty much the same time i.e. 00:00 UTC which is about 8pm local time in the evening for the stations concerned.
From these spots, the earliest time is 23:45 UTC and the latest time is 00:39 UTC, a window of about one hour.
Spotter Freq. DX Time Info Country
NP4BM-@ 144300 ZP9HTL 23:54 21 Jan 22 59 tnks tep qso Juan Paraguay
NP4BM-@ 144300 ZP9HTL 00:06 14 Jan 22 59 tks qso Juan Paraguay
WP4G 144300 ZP9HTL 00:39 13 Jan 22 55 in FK68 Paraguay
NP4BM-@ 144300 ZP9HTL 00:30 13 Jan 22 still 59 Paraguay
WP4KJJ-@ 144300 ZP9HTL 00:19 13 Jan 22 Paraguay
KP4EIT-@ 144300 ZP9HTL 00:10 13 Jan 22 5/2 swl Paraguay
NP4BM-@ 144300 ZP9HTL 00:05 13 Jan 22 58 tks tep qso Paraguay