Other SOTA sites: SOTAwatch | SOTA Home | Database | Video | Photos | Shop | Mapping | FAQs | Facebook | Contact SOTA

40m just died


#1

Hi, is it just me or did the 40m band just die?

EU sigs were ok earlier but now there is hardly a signal to be found anywhere.

73 Mike


#2

In reply to GW0DSP:

I can hear a few EU stations at about S7 to S8, but they would have been S9+ earlier

73, Dave.


#3

In reply to GW0DSP:
“Hi, is it just me or did the 40m band just die?”

Hi Mike ! No, no, you are not alone !
Here, it’s the same ! Now, I’don’t copy F6GCT/P.
Yesterday also: nothing from F6ENO/P.
I ask me: am I damned by the Ham’s Gods ??? :-))))))
73 QRO Mike,
Andy F5AKL


#4

40M is very QSB and QRM since 2 days here also, “don’t worry”…
Chris F8DZY


#5

In reply to F8DZY:

I think cndx not too good on 40m for 2 days but today at approx 13:30 the band just dropped out at my QTH, I think maybe a solar event?

73 Mike


#6

In reply to GW0DSP:

Hi Mike,

Global space WX looks normal

http://www.swpc.noaa.gov/ftpdir/latest/wwv.txt

http://www.swpc.noaa.gov/ftpdir/indices/DGD.txt

Probably at that UTC you should move up in frequency to 30 m or 20 m band.

73, Jaakko OH7BF/F5VGL


#7

In reply to F5VGL:

Thanks Jaakko, the band did seem to recover later in the afternoon, but Alain was not his usual big signal.
I think it was just a case of the skip length being much shorter than usual.

vy 73 Mike GW0DSP


#8

In reply to GW0DSP:

From ips.gov.au:

Last updated 04 Mar 2008 17:00 UT

SUBJ: IPS PRELIMINARY HF RADIO COMMUNICATIONS WARNING 08/07
ISSUED AT 03/0302Z MARCH 2008
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 03-04 MARCH 2008
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
A MORE DETAILED HF WARNING WILL FOLLOW IF DEPRESSIONS EVENTUATE.

Andy
MM0FMF


#9

In reply to MM0FMF:

Aha, interesting stuff Andy, the effect at my station was very unusual today to say the least. The majority of /p stations just disappeared in an instant, even the regular big sig chasers across the EU were inaudible, just as if somebody had thrown a switch, it was that pronounced.
All part of the fascinating subject of HF propagation. The lower frequencies were superb, ie 80/60m with most sigs at 59.
As I said earlier, 40m did make a slow recovery throughout the afternoon and I was able to chase Alain F6ENO/p on his 2nd summit.

73 Mike


#10

In reply to GW0DSP:

HF was definitely poor yesterday, I only managed to log 30 contacts on each of my 2 activations using 20/40/60/80m.

O.B.O. Steve G1INK.


#11

In reply to GW0DSP:
Check out www.spaceweather.com - there’s a big coronal hole coming into geo-effective position so expect a few days of choppy space weather!

Brian G8ADD


#12

Here is a nice poster on how the K-index is expected to influence the propagation

http://www.interalia.plus.com/SOLAR_HO.pdf

The change in propagation could be related to the unsettled conditions of last week.

Now the days are getting longer and that is influencing also the MUF values.

73, Jaakko OH7BF/F5VGL