Saturday, November 5, 2016
Friday, November 4, 2016
Thursday, November 3, 2016
HFSat and The All-HF Amateur Radio Satellite Transponder
One facet of the diverse pursuit that is amateur radio involves the use of amateur radio satellites. These have a long history stretching back to the years shortly after the first space launches, and have been launched as “piggy-back” craft using spare capacity on government and commercial launches.
Though a diverse range of payloads have been carried by these satellites over the years, the majority of amateur radio satellites have featured transponders working in the VHF and UHF spectrum. Most often their links have used the 2m (144 MHz) and 70cm (430MHz) bands. A few have had downlinks in the 10m (28MHz) band, but this has been as far as they have ventured into the HF spectrum.
A new cubesat designed and built by trainees at the US Naval Academy promises to change all that, because it will feature an all-HF transponder with a 15m (21MHz) uplink and a 10m downlink. To that end it will carry a full size 10m wire dipole antenna. The 30KHz wide transponder is an inverting design intended to cancel out the effects of Doppler shift. In their write-up they provide a fascinating description of many aspects of cubesat design, one which should be of significant interest beyond the world of amateur radio.
If the subject of amateur radio in space interests you, have a look at our series on the matter, first covering the OSCAR satellites, and then our recent feature on its use in manned missions.
[via Southgate ARC]
Filed under: radio hacks
via radio hacks – Hackaday http://ift.tt/2fkam9R
Wednesday, November 2, 2016
Tuesday, November 1, 2016
Lucid Dreaming | 3rd person lucidity problem
Hi there, im new to lucid dreaming. Im learning to lucid for a month or two now, i know its not a lot but i keep having the same problem.
I come lucid a lot of times in dreams, in fact its like every second or third dream that i remember... but the problem is that i cant do anything about it...
All my dreams (at least those that i remember) are from a 3rd person prespective... and its not just the view, but i have no control over the second ,,me" in dreams... its like there is 2 of me...
Me as in me that knows he is lucid, and me in the dream...
So even if i come lucid i cant control the ,,me " in my dream even if i want to.
And i have absolutely no control over the dream. The second me goes through the dream like any other dreams.
So my question is, will it be a problem? Will i learn to control dreams even through third person or is there a way to switch to 1st person :D?
And another question... sometimes i realise that its probably a dream but im not sure... but i always forget about reality checks... i just wake up and give myself a facepalm.
So if i do reality checks will i remember to do them in dreams?
I come lucid a lot of times in dreams, in fact its like every second or third dream that i remember... but the problem is that i cant do anything about it...
All my dreams (at least those that i remember) are from a 3rd person prespective... and its not just the view, but i have no control over the second ,,me" in dreams... its like there is 2 of me...
Me as in me that knows he is lucid, and me in the dream...
So even if i come lucid i cant control the ,,me " in my dream even if i want to.
And i have absolutely no control over the dream. The second me goes through the dream like any other dreams.
So my question is, will it be a problem? Will i learn to control dreams even through third person or is there a way to switch to 1st person :D?
And another question... sometimes i realise that its probably a dream but im not sure... but i always forget about reality checks... i just wake up and give myself a facepalm.
So if i do reality checks will i remember to do them in dreams?
via Lucid Dreaming - Dream Views - Attaining Lucidity http://ift.tt/2f7OLoW
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