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Re: AO-51 in mode L/S over Europe



Hi all

I just had oportunity to try AO51 L/S mode on 2230-2245z pass.
The bird was strong (up to 59+), and I worked OZ1MY and 2E1EUB!
However it was a tough work to keep both doppler shifts correct at same.
The first half of the pass I let Trakbox do the job for me, but this looks
like one of those things, that if you want it done right, you have to do it
yourself, hi! The result was very poor, and I barely heard my own downlink.
So, as soon as I heard Ib calling, I disconnected the CAT cable from tx
and took care of doppler. It worked much better, as soon as I start tuning
each VFO on the right direction :o)
Bottom line: this is a very "exclusive" mode, but requires a lot of work,
hi.

My equipment: TS790A + 1.2G module
Uplink: 10W, Heliax cable, Tonna 35 elem H pol.
Dwlink: Helix, Keps converter, 1.2m prime focus dish.

73 F.Costa, CT1EAT
www.qsl.net/ct1eat

----- Original Message ----- 
From: "OZ1MY" <oz1my@privat.dk>
To: "AMSAT-BB" <amsat-bb@AMSAT.Org>
Cc: "amsat-oz" <amsat-oz-bb@amsat.dk>
Sent: Thursday, October 21, 2004 7:12 PM
Subject: [amsat-bb] AO-51 in mode L/S over Europe


> Hi all,
> I listened to a pass with AOS at 1607 UTC here from
> Copenhagen - and just heard it and could hear myself.
> Max. elevation 2 degrees. The pass was to the east.
>
> Next pass with AOS at 1741 UTC also to the east
> with a max. elevation of 11 degrees was much better.
> Now I was able to get a pretty good signal throu
> the satellite sometimes.
> Lots of QSB on both passes since I am using linear polarisation on
> my 2,4 GHz BBQ grill dish.
> Another problem is that my antenna tracking do not follow very tight
> to avoid wear on the system. Helped it manually sometimes.
>
> I use an ICOM IC-910H with 10 W in the radioroom. At the antennas
> it is a little less than half of that.
> Antennas are 2 19 turn helix types, RHCP.
>
> Downlink is a BBQ grill dish 60 by 90 cm, linear polarisation with
> a mastmounted DB6NT downconverter.
>
> One interesting thing about the IC-910H is that the AFC was able to
> follow the doppler shift on the downlink frequency - that is cool :-)
> Only had this little fellow for a couple of weeks - but I like it
> already.
>
> Would be better to use computer control. That may come later.
>
> 73 OZ1MY
> Ib
----
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