[amsat-bb] Re: FO-29 QSO Below the Horizon
domenico.i8cvs at tin.it
Mon Mar 26 10:59:32 PDT 2012
When AO40 was alive and well I had many QSO's
with the East coast of USA in Mode L/S with the
satellite down up to - 2.5 degrees belove the horizon
for me and for the station in contact with me.
The keplerian elements were the same for me and for
the stations in contact with me using both the same
tracking program InstantTrack.
We supposed that in particular situations of temperature
and humidity a duct is created over the surface of the see
permitting the contact belove the horizon
We can't investigate more deeply into the above
phenomenon because AO40 died.
I do not remember the call letter of many stations in
USA in contact with me under such circumstances
but if someone from the Est coast read this letter and
----- Original Message -----
From: "John Papay" <john at papays.com>
To: <amsat-bb at amsat.org>
Sent: Monday, March 26, 2012 4:45 PM
Subject: [amsat-bb] FO-29 QSO Below the Horizon
> Every now and then someone asks about the possibility
> of making a satellite QSO when the bird is below the
> horizon. Once in while it happens as it did with Adrian,
> AA5UK/KH6, on FO-29 this morning at 0849utc.
> Adrian has been operating from KH6 and trying to give out
> WAS to the deserving. Many have made their first Hawaii
> QSO thanks to his efforts. I had a 0.8 degree pass this
> morning on FO-29 but when Adrian was at 3 degrees, I was
> at 0.0 degrees. There was a short window of opportunity
> after that point.
> As I was waiting for FO-29 to come up over the horizon I started
> hearing Adrian at -0.9 degrees. At -0.5 I called him and we had
> a qso that ended about 2 seconds after my AOS. My recorder is
> configured to start recording at AOS and it only captured a few
> seconds of my last transmission. Doug KD8CAO had his recorder
> running so you can hear my qso that took place below the horizon.
> I have my ground elevation in the setup so the calculations should be
> The best opportunity for a below the horizon contact occurs when
> the satellite is skimming the horizon rather than going away from
> you. If it is skimming there is much more time at the critical
> -1.5 to 0.0 degree elevation and that is what happened this morning.
> Recordings are on my website. http://www.papays.com/sat/general.html
> A big thank you to Adrian for making the effort to work the difficult
> passes and stretch the limits. If it were easy, everyone would be
> doing it.
> John K8YSE
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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