[amsat-bb] Re: Use of ICOM 910 for AO-51 L-Band BBS Uplink?

[OZ1MY]

Hi Jim,
I use the same setup - but for analog uplink.
Antennas are two 19 turn helix stacked about 2 wavelength above
one another. The combined gain is 18 dBiC.
That works most of the time - but EIRP is a bit low when AO-51 is at
3000 km range.
For the digital uplink I think you need more EIRP.
Either add a PA with 30 to 50 W out or larger antenna(s).
73 OZ1MY
Ib
----- Original Message ----- 
From: "Jim Heck" <jimlist at milnet.uk.net>
To: <amsat-bb at amsat.org>
Sent: Thursday, August 20, 2009 11:05 AM
Subject: [amsat-bb] Use of ICOM 910 for AO-51 L-Band BBS Uplink?


> Hi Folks,
>
>   I would be interested to know if anyone is using an ICOM 910 with the
L-Band
> module for Ao-51 uplink on the BBS? (The optional L-Band unit for the 910
runs 10
> watts according to the book).
>
>   I am particularly interested to know what type/gain of antenna I would
need to get
> a reliable up link. I am planning to use about 20 metres of Ecoflex 10,
which will
> introduce a loss of something like 3 Dbs.
>
>   I know that the LBand/Digital up link is currently off, just gettting
ready for
> the next 'on' period!
>
> 73s
>
> Jim G3WGM
>
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