You cannot always believe spots via the internet…

JT65 HF with webSDR

It’s cheating I know. But considering I still had my thoughts about my 5W 40m signal being received in daylight by VP8DMH Mike in Antarctica. It came across my mind that Mike could have been testing with a webSDR located in Europe. Is that possible, as JT65 is time related and internet has a bit delay. So, I would like to test it and set up JT65 with a webSDR in the USA. At the middle of the day I reported some American JT65 calls to PSK reporter. So, you cannot always believe spots via the internet. Although received by radio, the reporting station can be everywere, propagation or not! With that in mind I mailed Mike down on Antarctica, I wished to solve the mystery. Did he use a webSDR in Europe or his own receiver?

Here our small conversation: 


On 23/Dec 04:15, BasLev wrote:


> Hello Mike,
> I hope you don’t mind writing you but I have something on my
> mind that I would like to solve.  I was received by your
> station at 20-12-2011 see my
> blogpost:?
> But since you were in daylight and far from the greyline this
> would be impossible in my opinion.  You also wrote??on
> equipment would not arrive before christmas.  It
> could be received by a SW receiver of course. But it could also
> be that you were listening/decoding via a webSDR?
> Can you help me out with this??
Hi Bas,


Thanks for the mail.  My main radio is indeed on the ship, and
won’t be with me for another week or so, but I do have my FT-817
with me, and I’ve been using that for WSPR and JT-65A in the


As for propagation, strange things happen down here!  We have a
suprisingly good nighttime path to the EU on 40m, even though
it’s 24-hour daylight here at the moment.  I recently did some
tests over a few days using WSPR, which I wrote about here:
You might be interested in the video linked at the bottom of the
4th paragraph, which shows propagation from here to Europe as
night falls.


I did make a couple of European JT65 QSOs on teh 20th as well as
just listening, so hopefully I’ll see you in the log at some




Mike, VP8DMH


P.S. my location given the pskreporter website is out of date; my
current QTH is HB64ok.

A very fast reply and amazing that I can just e-mail to someone in Antarctica. So he did receive me on his FT-817. And he even made a few QSOs to Europe. And most interesting of all he has his own blog and actually does something usefull with the WSPR data. I was really surprised and can recommend this video. It gives a nice insight in the Antarctic propagation. Anyway, e-mail still is the best way to verify if you want to be certain a station heard your signal, especially in suspicious situations. Internet can be usefull but also very misleading and that concerns not only amateurradio !!

A small JT65 cheat..
Bas, PE4BAS, is a regular contributor to and writes from Groningen, Netherlands. Contact him at [email protected].

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