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 s
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 experimen
@amsat.org [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 "m
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 i
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 ha
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 longes
[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 gro
>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 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
http://www.southgatearc.org/
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, usin
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 L
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 doll
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" i
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" i
° elevation and -3 dBi overhead at 90°
elevation.
73" de
i8CVS Domenico
- Original Message -
From: "Dave Guimont"
To: "Phil Karn" ; "Bob Bruninga"
Cc:
Sent: Friday, August 19, 2011 7:31 AM
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
>
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
h
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
http://cid-1973adc8c1
- 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
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 sup
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 any
> 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 a
25 matches
Mail list logo
