Sporadic-E (Es)

 In the late spring and early summer we get sporadic-E in the northern hemisphere. Bands it most impacts are 10m-4m with occasional openings on Band 2 FM and rarely on 2m.

When Es is good there are widespread, strong openings and, QRM allowing, only really low power is needed. Indeed last year I was spotted across Europe on many occasions on 6m FT8 with less than 10mW ERP.

It usually starts in early May and disappears around early August, with the best months being May and June. Occasionally multi-hop or chordal hop Es can cover astounding distances, which is one reason 6m is called "the magic band".  Many years ago I recall working the USA with QRP one summer on 6m CW

Es can occur at any time of year but is best in late spring and early summer.

European Es

In the last few days, I have found this site extremely useful. In a few seconds, I can get a "snapshot" picture of Es conditions in Europe. It gives me a good idea of what bands may prove useful. Of course, Es can change very quickly so this is not perfect, but it is a useful guide.

See https://www.tvcomm.co.uk/g7izu/radio-propagation-maps/europe-sporadic-e/ .

Sporadic E (Es)

We are just entering the Es season in the northern hemisphere. DX out to about 1500km with low power is common on the lower VHF bands. The photo shows my V2000 omni in 2020. On 6m even QRP SSB is enough to work DX. 

Winter Es

Don't ask me why, as I do not know, but there is a small uptick in Es propagation in mid-winter. Do not be too surprised to copy Europeans on 10m and 6m, and possibly 4m too. I think Es can remain good until the end of January (ish). Remember that Es can occur at any time of year but is most common in the northern hemisphere in May, June and July. 

FT8 can be good for this as even very short openings are caught and FT8 is well monitored. As you know, Es signals can be very strong.

Es on 10m and 6m WSPR

I noticed Es propagation on 10m and on 6m WSPR today as well as single-hop F2 to EA8BVP (2986km) on 10m.  Conditions otherwise on 10m have not been good.

UPDATE 2015z:   EA8BVP (2986km) has spotted me (single hop F2) no less than 77 times so far today. Getting further is proving impossible, but this path seems to be open daily.

6m WSPR and the transatlantic path by Es

6m spots - note the drift

 There seem to be more people trying WSPR on 6m than in previous years. Prompted by Nick G4IKZ this evening I have moved from 10m to 6m and have spotted CN8LI (2113km) and been spotted myself by a few G stations. On 6m the Doppler shift on signals can be quite fierce and setting the FT817 accurately on frequency is a little more tricky: I have to set the FT817 to 50.29260 rather than 50.2930kHz to get the correct frequency spots. I assume my 12 year old reference oscillator in the rig is a bit off. On inter-G signals I suspect that the Doppler is a result of aircraft reflection. On more distant DX stations I assume it is as a result of E layer clouds moving around.

Doppler on transatlantic 6m multi-hop Es signals might be a killer - I can imagine reflection points moving around in the E layer  - but if not, then WSPR would be a great way to check for transatlantic openings.

I'll leave the 2W WSPR to the co-linear vertical running overnight tonight and on a few further nights through June and July. We just need LOTS more USA and Canadian stations both monitoring and RXing on 6m WSPR.