Wednesday, January 25, 2023

TEP opening on the 40 MHz band between the Caribbean and South America - 24th & 25th Jan 2023

While there have been plenty of reports of propagation on the 40 MHz (8m) band recently, there have been very few reports from South America.

Martin, PJ4MM on the island of Bonaire in the Caribbean reports the following...

"This evening (24th January), I turned my antenna to the South and I received 8 reports from Chile (CE), Argentina (LU) and Brazil (PY).

Date  - Time in UTC - Reports from - Locator Square - Signal / Notes
24/01/23    23:58:00    PT9FD    GG27OR    -20dB    
        23:58:00    PU2MBY    GG47GU    solid trace    No decode, TEP distortion

25/01/23    00:07:00    LU8YD    FF51XB    -15dB           
        00:10:00    CE3VRT   FF46PI    solid trace    No decode, TEP distortion
        00:03:00    LW2DAF    GF05RK    -8dB        (-18dB on 6m)
        00:37:00    LU7FTF   FF88WI    loud audio   
        00:38:00    CE3VRT   FF46PI    -16dB       
        00:48:00    CE3SOC   FF46RJ    -14dB "

Analysis... With TEP signals, they are generally at right angles to the Geomagnetic Equator and especially at the higher VHF bands. At frequencies about 100 MHz, the paths are usually from Chile to Colombia, Argentina to Bonaire, Curacao and Puerto Rico and from the south of Brazil to the eastern part of  the Caribbean... e.g. Guadeloupe and Martinique.

On a lower frequency like 40 MHz, signals can be quite a bit off from being at right angles and still get through. Hence you can see that PJ4MM could be heard in Chile, Argentina and Brazil.

As the map above shows, most of the reports came from stations in the region of 4000 to 5,500kms which is pretty normal for TEP paths. The time was around midnight UTC which is about 9pm. 8-9pm local time is usually the time for evening TEP openings.

There have been some reports of TEP openings in South America at 144 MHz so it should be no great surprise that it was open at 40 MHz as well. It just took someone to try some tests on the 8m band.

I think it is especially welcome to see so many reports from South American stations and it will hopefully generate more interest in that part of the world in the 40 MHz (8m) band.

It would be interesting to see if the South American stations could hear some of the experimental 40 MHz stations in the USA? I think it might be possible in April when the TEP and Sporadic-E seasons overlap.

USA... Martin did also mention that he thinks there are more radio amateurs in the USA now listening on the 40 MHz band as well. These were the US stations that heard his FT8 signal on the 40 MHz in a 24 hour period.

Link... For more information on the 8m band, see my 40 MHz page HERE

Addendum: 27th Jan 2023 - Martin ,PJ4MM reports... "Today again reports from LU/CE/PY and first time from Ecuador (HC). Also reports from the "Usual suspects" in the USA, and a first time report from WM2XCC in San Diego."

Reports from South America...
Rcvr Band Mode Distance Time (UTC)
HC2FG 8m FT8 2049 km 02:40:15
LU3HO 8m FT8 5302 km 02:39:29
CE3SX 8m FT8 5080 km 02:09:28
PU8YPL 8m FT8 2203 km 01:36:58
PP2RON 8m FT8 3833 km 01:24:29

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