[amsat-bb] Re: Path to HEO
m5aka at yahoo.co.uk
Wed May 1 00:28:29 PDT 2013
--- On Tue, 30/4/13, Nick Pugh <quadpugh at bellsouth.net> wrote:
> Both Pumpkin and ISSIS say they have flight heritage on
> 50 watt panels. EaLanta has rides to 600 KM
50 watts on a CubeSat ? That surprises me, I don't know of any that have flown so far that have generated more than about 6 watts of Solar Power. When you say "flight heritage" which CubeSat is being referred to ?
A free ELaNa CubeSat launch would mean partnering with an educational institution so part of the 3U and some of the solar power would have to be reserved for their payload.
> and we will have to deal with MR Van Allen when we get there.
Hopefully deal with it by design on the ground first ;-)
RS-15 (beacon 29.325 MHz) has been in the lower part (2,158 by 1,900 km orbit) of the radiation belt for over 18 years.
73 Trevor M5AKA
--- On Wed, 1/5/13, M5AKA <m5aka at yahoo.co.uk> wrote:
> Date: Wednesday, 1 May, 2013, 7:53
> --- On Tue, 30/4/13, g0mrf at aol.com <g0mrf at aol.com>
> > A compromise could be 4 Watts (ish) from MEO.
> > Here's an oldie but goodie..... http://www.g0mrf.com/MEOSAT.htm
> Yes MEO would be good. It should be possible to improve the
> signal levels while keeping omni-directional antennas on the
> satellite by using lower frequencies bands.
> A 144 to 50 MHz (if we can get an allocation there)
> transponder or 144 to 28 MHz would have a significantly
> reduced path loss on the downlink (8 dB ?) compared to
> 73 Trevor M5AKA
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