What kind of codec makes the most sense to you? We have things like D-Star that
have existing hardware (the codec exists and is documented). Many really seem
to find it unusable since they have to pay for it. I find it odd that their
time to reinvent the wheel is somehow free.
Are there
On 8/19/11 7:51 AM, Gregg Wonderly wrote:
What kind of digital are you suggesting? Voice and data both? A
digital path from anywhere on the planet to the appropriate ground
station is easily doable with some documentation of the ground stations.
Digital voice would be the easiest to support
fact that none of these piggyback payloads have ever come
to fruition,
Yeah, it brings us back to the original question about why don't you guys
propose a satellite that hooks on a bigger satellite? ... we can't say we
haven't tried ... Synchronous Amateur Radio Transponder (SYNCART) was an
° elevation and -3 dBi overhead at 90°
elevation.
73 de
i8CVS Domenico
- Original Message -
From: Dave Guimont dguim...@san.rr.com
To: Phil Karn k...@philkarn.net; Bob Bruninga bruni...@usna.edu
Cc: amsat-bb@amsat.org
Sent: Friday, August 19, 2011 7:31 AM
Subject: [amsat-bb] Re: Turn off AGC
On 8/18/2011 10:38 PM, Phil Karn wrote:
On 8/18/11 11:03 AM, JoAnne Maenpaa wrote:
Yeah, we still have dreams! At various times it had been called AMSAT-Eagle,
Phase IV Lite, C-C Rider, and other things. You'll notice from the dates on
these papers how long we've had this dream of a millions
What kind of digital are you suggesting? Voice and data both?
The Eagle project at one point proposed an AMSAT Advanced Communications
Package (ACP) microwave, digital-uplink (5650 MHz) and digital downlink
(3400 MHz).
Realizing that microwave earth station design is beyond the scope of most
axial
wavelengths.
Art,
KC6UQH
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Phil Karn
Sent: Thursday, August 18, 2011 10:44 PM
To: Dave Guimont
Cc: amsat-bb@amsat.org
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
On 8
For additional information read
http://www.w2du.com/r2ch22.pdf
and look at Fig 22-7 page 10 of 20 Radiation Pattern of the 1 1/2
turn 1,25 wavelenght Quadrifilar Antennas.
Tnx, Dom for that info.
I received a number of requests for quadfilar information, again.
Goto
- Original Message -
From: i8cvs
To: Dave Guimont
Sent: Saturday, August 20, 2011 6:54 AM
Subject: Re: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Hi Dave, WB6LLO
Please look also at my article Experimental Investigation of 2400 MHz
Quadrifilar Helix Antennas
[Using attitude control]...
We could mount microwave antennas on a nadir-facing
surface and provide consistent, predictable, strong,
wideband signals to ground stations during a pass.
The problem with LEO satellites is that a nadir facing antenna does give
great gain directly overhead
From what I have read that is published, the DOD Colony II 3u cubesats are 3
axis controlled and pointable to within a degree or something close to that.
As Bob pointed out this isn't a big help for antenna pointing for multiuser
LEO sats, but when you read the power production the Colony II
--- On Thu, 18/8/11, Andrew Glasbrenner glasbren...@mindspring.com wrote:
published, the DOD Colony II 3u cubesats are 3 axis
controlled and pointable to within a degree or something
close to that.
UK company Clyde Space also doing work in this area, see
CubeSat High Resolution Camera
Op 18-8-2011 16:08, Andrew Glasbrenner schreef:
From what I have read that is published, the DOD Colony II 3u cubesats are 3
axis controlled and pointable to within a degree or something close to that. As
Bob pointed out this isn't a big help for antenna pointing for multiuser LEO sats,
but
Hello Andre,
Has anyone ever considered piggybacking on a geosat in a simular
way the rs11 to 13 did?
Sure you would need a very good lobbyist to get a ride with a multi
milion dollar broadcast sat and it would only see one continent but it
will give that continent 24/7 coverage, using 3
On 8/18/11 5:47 AM, Bob Bruninga wrote:
The problem with LEO satellites is that a nadir facing antenna does give
great gain directly overhead ground stations, but only for about the center
2 minutes of only the one direct overhead pass a day. The problem with
facing antennas down on a LEO
On 8/18/11 11:03 AM, JoAnne Maenpaa wrote:
Yeah, we still have dreams! At various times it had been called AMSAT-Eagle,
Phase IV Lite, C-C Rider, and other things. You'll notice from the dates on
these papers how long we've had this dream of a millions dollar rideshare
with a millions dollar
You don't have to use a narrow beam antenna with maximum gain on axis.
You can always design it with a bowl-shaped pattern that increases gain
toward the edges and lowers it in the middle.
That's why the quadrifilars work so well. I measured the pattern some
time back, and the beam width is
On 8/18/11 10:31 PM, Dave Guimont wrote:
That's why the quadrifilars work so well. I measured the pattern some
time back, and the beam width is about 140 degrees
Yes, something with that kind of beamwidth would be ideal on the
nadir-facing surface of a stabilized satellite in low earth
You don't have to use a narrow beam antenna with maximum gain on axis.
You can always design it with a bowl-shaped pattern that increases gain
toward the edges and lowers it in the middle.
That's why the quadrifilars work so well. I measured the pattern some
time back, and the beam width is
Hi Phil,
This is a great reminder. Thus far, my data has been collected with the
TS-2000x using a mid setting for AGC; and with the HDSDR software set to AGC
Med when using/playing back Funcube Dongle data. I've set both to OFF now,
since it's possible
I wonder if anybody has experimented
[mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Mark L. Hammond
Sent: Wednesday, 17 August 2011 20:36
To: Phil Karn; Amsat - BBs
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Hi Phil,
This is a great reminder. Thus far, my data has been collected with the
TS-2000x using a mid setting
On 8/17/11 1:36 PM, Mark L. Hammond wrote:
In any event, Phil...THANK YOU for making this code real. I have
seen it print data when the signal was visibly in the dirt which is
impressive and fun to see.
You're most welcome. It was a lot of work mainly because there were so
many options in
I have no option to turn off AGC with the FT-736R. I had been running
on the Medium setting (my default) and have switched to Slow now. I'm
not sure to say because it's rather subjective just watching, but I
think it has slightly improved capture especially at AOS and LOS as well
as when I
On 8/17/11 4:24 PM, Alan Cresswell wrote:
That's interesting. I have collected all my passes on the TS2000 with the
AGC on and set to the longest setting. This is mainly because I often
record the signal level every 0.5 seconds during a pass which requires the
AGC to be on and the longest
Hi Phil, KA9Q
Since modern VHF/UHF receivers do not supply AGC switching
ON/OFF I use and old HF Drake R-4C receiver tuned from 28 to 30
MHz with a 144/146 MHz receiving converter in front of it having
a 28/30 MHz IF
In general the old HF receivers supply AGC slow-medium-fast and
OFF
The above
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