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@milnet.uk.net To: amsat-bb@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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