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G0SYR > EME 23.03.06 20:10l 107 Lines 4822 Bytes #999 (0) @ WW
BID : 2086G0SYR
Read: GUEST DF1RB
Subj: Re: A little help
Path: DB0FHN<DB0MRW<DK0WUE<7M3TJZ<PY1AYH<CX2SA<GB7CIP<GB7CIP<GB7CIP
Sent: 060323/1800Z @:GB7CIP.#32.GBR.EU $:2086G0SYR
T:From: g0syr <g0syr@gb7cip.ampr.org>
T:Newsgroups: ampr.prop.eme
T:Message-Id: <161wwvnxdy9yy$.r3x2hv2cxfyn$.dlg@40tude.net>
Hi Mario and all
On Wed, 22 Mar 2006 23:30:00 +0000,
ti2mab%ti0paq.sjo.cri.ceam@gb7cip.ampr.org wrote:
> From: TI2MAB@TI0PAQ.SJO.CRI.CEAM
> To : EME@WW
>
>
> Hello EMErs
>
> I need some help about something that happened and I do not
> believe it, when I saw it on the screen of the WSJT 498 by K1JT
> program.
>
> Well, the thing that happened was that I was trying to setting
> the program up because I would like to see if it was possible to
> receive some signals from EME activity.
>
> The big surprise was when I see on the screen of the program
> several lines from a station WA4VWR, EM55mm and one of the
> station YO3JW, KN34ck calling to me, or something like that.
>
> Until here, everybody could say "well that is nothing extrange",
> but the surprise was that I was not using a directional antenna,
> or a big gun, I was only with a homebrew vertical 19+ (1/4 wave
> lenght in 2m band and 3/4 in 70cm.) that I use for LEO satellites.
>
> The question is... Is it possible? Many times when I heard some
> people talking about moonbounce activity, I understood that they
> have to use big gain antennas, big dishes for tx and rx signals.
>
> Why I received this lines? Are they from a moonbounce? Or maybe
> some propagation in the atmospheric layers helped me? I think
> that the only way to prove that is asking for the operators of
> that stations. What do You think about it?
>
> I think this happened when I send some tones or messages like
> "CQ TI2MAB EJ79" when I was trying to set the program up, but I
> supposed that with my 0 dB antenna gain was not possible that
> somebody hear me. I run 50 w on a 706 mkllg in 144.140 Mhz.
>
> The full line that I received in WSJT 498 by K1JT program between
> 14:00 to 16:00 UTC with a moon elevation angle between 24 and 26
> degrees, 3-22-06, was:
>
> File ID Sync dB DT DF W JT65A MODE
>
> 071101 1 -29 4.6 -470 24 * TI2MAB WA4VWR EM55 ? 0 1
> 152001 1 -27 -0.9 93 5 # TI2MAB YO3JW KN34 0 ? 0 1
>
> (Is this info correctly? I ask for it because I really was not
> specting anything, that is my doubt.)
>
> Where could I take some info about EME? In this phase of my
> understanding of the topic I do not know anything about it, I
> began to translate the WSJT User's Guide in text format for use
> and understand how is the program doing the job.
>
> I would like to know if some of You fellows, know to this people
> and like I do not have the callbook, I could not looks for them,
> maybe You can send to me the address for answer them with the
> QSL card. If someone know to this Hams please, could You speak
> them about this report?
>
> A Ham dream...
>
> Many times I dream with the posibility to make a contact someday
> throug the moon, also I am sometimes thinking an idea and ask
> myself why the amateurs does not plan with NASA, and now maybe
> with ARISS, the posibility of instaling some repeater or maybe a
> transponder in the moon? Now with the next trip to Moon maybe it
> could be possible. There is the idea, could We do that?
snip
I have recently had a similar experience Mario. Our local beacon
GB3VHF has recently been rebuilt and now radiates its callsign
and locator in JT65B mode on 144.430 Mhz.
I ran up the WSJT software to monitor it and connected up just a
few cm of wire to my transceiver to monitor the JT65B signals.
After a few minutes like you I was surprised to see an American
callsign 'calling' me :-) it was followed by several other
interesting callsigns apparently calling me.
When you have translated the help files for the software you will find
it includes a database of known active EME stations. When it is
decoding signals in the noise, because it knows exactly when a call
would be made and exactly what is contained in that call, as the
messages are of a known format, it matches what it 'hears' to callsigns
in its database and if it finds a sufficiently close match it fills
in the other bits of the message and displays what it imagines it
has heard as a perfect message.
I don't know how much it needs to copy to make a match but it seems it
regularly manages to 'hear' non existent calls when it is just receiving
noise so you need to be aware of this and ignore them.
I haven't read any more in the software whether you can turn this
facility off but I think there is a flag that indicates that the
validity of the message is suspect.
Sorry to disappoint you but I suspect this is what you have seen.
--
73 de Bryan g0syr.ampr.org [ 44.131.244.60 ]
Amprnet mail g0syr@gb7cip.ampr.org
AX25 mail G0SYR@GB7CIP.#32.GBR.EU
Internet Mail g0syr@beeb.net
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