[amsat-bb] Re: A0 40 replacement - mode K cubesat?
dave at g4dpz.me.uk
Thu Sep 5 01:15:39 PDT 2013
ZACUBE is a HF beacon. Something like this may be a foundation for what
It's riding along with FUNcube in the same POD. Take a look at this
page, about half way down you'll see the ZACUBE deployment mechanism.
On 05/09/13 08:09, Ross Whenmouth wrote:
> How feasible is it to fly a mode K (15m uplink, 10m downlink) linear
> transponder on a cubesat?
> I expect that retty much any ham with an HF transceiver would be able
> to work this bird, and I expect that due to the lower frequency, the
> footprint might be a bit larger than that of VHF/UHF bird in the same
> orbit and doppler shift would only be about 7% of that experienced on
> The biggest problem that I see though is squeezing a somewhat
> efficient 10m antenna into a cubesat and deploying it by remote
> control once on orbit. (I think that the cubesat antenna should be
> optimised for TX performance, as cubesat TX EIRP capability is
> severely limited compared to the average HF transceiver).
> Would two 2.5m lengths of steel tape (the same stuff that tape
> measures are made out of) - mounted on opposing sides of the cubesat,
> be able to unroll in microgravity to form a generally straight 1/2
> wave dipole with a low risk of tangling, snagging or kinking, etc?
> Alternately, what about using some sort of thin plastic tubing
> (something like dialysis tubing, but suited to the space environment?)
> with a wire inside it, and rolled up. Then, once on orbit, the tubing
> is inflated with self-expanding polyurethane foam, which will extend
> the tube (and the wire inside it). The foam will then harden, so
> future loss of gas pressure in the plastic tube (micrometeorites?)
> will not cause failure of the antenna?
> 73 ZL2WRW Ross Whenmouth
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