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CX2SA > SATDIG 06.09.13 03:41l 936 Lines 32589 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: A0 40 replacement (Brenton Salmi)
2. Re: S band LEO Sat tracking (g0mrf@xxx.xxxx
3. Another Delay For Next SpaceX Launch (B J)
4. Re: AO-40 Replacement (Rob)
5. Re: ISS SSTV Active on 145.800Mhz, Stuck PTT (MM)
6. Re: S band LEO Sat tracking (Bob- W7LRD)
7. Re: AO-40 Replacement (Paul Stoetzer)
8. Re: ISS SSTV Active on 145.800Mhz, Stuck PTT (Fabiano Moser)
9. Re: S band LEO Sat tracking (John Becker)
10. Re: A0 40 replacement (PSK31-Best of FM and Linear!)
(John Stephensen)
11. Re: Path to HEO (Samudra Haque)
12. Re: Path to HEO (Robert McGwier)
13. N8RO/P in EN76 (Les Rayburn)
----------------------------------------------------------------------
Message: 1
Date: Thu, 5 Sep 2013 12:04:47 -0700
From: Brenton Salmi <kb1lqd@xxxxx.xxx>
To: M5AKA <m5aka@xxxxx.xx.xx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID:
<CA+7Uq1gpTW=t=itaTE3qfsb=FcODfPDXBQe6sq1SbmYHWd13Gg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
The modular SDR board for universities is exactly what Fox-1 and Fox-2 (as
well as future Fox's) aim to do! Unfortunatly noone here will get details
on the current specs or design due to ITAR restrictions but if you become
part of the Fox project engineers you'll see what's going on.
* I'll leave this e-mail with just a thought: *
*?Just remember - when you think all is lost, the future remains?* - Robert
Goddard
Engineering is about doing things people say can't be done, think about the
size/power requirements of satellites 20 years ago, 10 years, ago... their
functional density....
It's not impossible, just difficult!
Thanks,
Brent, KB1LQD
On Thu, Sep 5, 2013 at 9:37 AM, M5AKA <m5aka@xxxxx.xx.xx> wrote:
> > But what if the SDX that flew on ARISSat, or the one
> > that will be developed for the Future of the Fox series could be "sold"
> (or
> > given) to the university cubesat community as a radio capable of being
> used
> > to deliver science data?
>
> Hi Zach,
>
> Unfortunately there goes the CubeSat's power budget.
>
> The SDX transponders have an overhead, not just in terms of the physical
> space they occupy, but the amount of power they consume.
>
> I believe the most efficient SDX transponder has an overhead of some 350
> mW above the power consumed by an analog linear transponder and a linear
> transponder itself would consume more power than a standard 9600 bps
> CubeSat telemetry module.
>
> So it appears to be a non-starter for 1U CubeSats. Might be feasible on 3U
> CubeSats but it would mean much less power would be available for other
> experiments on the CubeSat.
>
> The question is what's in it for the CubeSat team ? The answer may be a
> higher data rate, the existing 9600 bps just isn't fast enough. In theory,
> depending on the modulation employed, a 30 kHz bandwidth SDX transponder
> could generate a 96 kbps downlink which is much more useful. To some the
> trade-off of power budget for downlink speed may prove appealing.
>
> At the moment it's all theoretical but certainly worth considering when a
> FOX-2 SDX transponder has been proven to work in space.
>
> 73 Trevor M5AKA
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 2
Date: Thu, 5 Sep 2013 15:25:39 -0400 (EDT)
From: g0mrf@xxx.xxx
To: milu111@xxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: S band LEO Sat tracking
Message-ID: <8D07884D6A8D7F2-FA0-DC1D@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Michael.
Depends on the bandwidth of the modulation and the transmit power
But as a rough guide, I used a 12 turn helix with about 10 degree pointing
accuracy with AO-51.
That's not good, but it works.
However, if you take the HAMTV equipment on the ISS, then you need a lot
more gain on the ground and pointing accuracy of 2 degrees or better.
Thanks
David G0MRF
-----Original Message-----
From: michael luft <milu111@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Thu, Sep 5, 2013 7:42 pm
Subject: [amsat-bb] S band LEO Sat tracking
What kind of positioning accuracy can be expected form amateur PC Software
and Antenna Rotators? Or, in other words: What kind of S band antenna (
gain or dimensions) is needed to track a S band LEO Sat?
73
Michael
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Thu, 5 Sep 2013 20:15:07 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Another Delay For Next SpaceX Launch
Message-ID:
<CAP7QzkM4TMk-bqkeEAD8b8fD3Hvf2WMVVdwKURUX6Luy-fp94A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://innerspace.net/2013/09/05/spacex-launch-update/
Meanwhile, SpaceShipTwo finishes another powered test flight:
http://moonandback.com/2013/09/05/spaceshiptwo-completes-second-powered-flight
/
http://www.parabolicarc.com/2013/09/05/spaceshiptwo-completes-powered-flight-m
ojave/
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 4
Date: Thu, 5 Sep 2013 20:28:41 +0000
From: Rob <pabutusa@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-40 Replacement
Message-ID:
<CAE1O4xruNjydmorqfV-sRi1SueV9p7RgxbFpGjN6Y4r1fg3qOA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I miss linear transponders .... I grew up with the early RS birds
particularly RS-6 and RS-8 .... I was only a "kid" in college ...
If you're looking for EASY ENTRY .... MODE A ROCKS!
That said .. I never bother with the FM birds .... tried once and it's was
just a barrage of callsigns and grids ....
I've been sticking with FO-29 and VO52 ... I need to give AO7 a try
Also ..... if anyone is looking for a great transponder module for a cube
sat ... look no further than the work of PE1RAH .... his transponder fits
in a "cube" and is already flight proven ....
High elliptical orbit satellites are cool .... harder to work ..... more
transmit power ... receive preamps ... probably not entry level stuff ...
I'd a rather see a couple LEO linear transponders rather than ONE HEO ...
--> Rob, KA2PBT
------------------------------
Message: 5
Date: Thu, 5 Sep 2013 13:45:16 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
To: Fabiano Moser <fabianomoser@xxxxx.xxx>, amsat-bb
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS SSTV Active on 145.800Mhz, Stuck PTT
Message-ID:
<1378413916.47612.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The stuck PTT while running SSTV on ISS has been a known issue
since the vox box was first connected to the TM-D700 in the year 2005.? The
ISS crew soon discovered the stuck VOX
transmitter issue.
One ISS crewmember left
the radio running all night sending SSTV images.? The next morning the radio
was excessively hot
and would not respond to button commands until after the radio was ?power
cycled?.
The Ariss vox box does not have any RF filtering inside the
device.? The devices was originally
designed to run on its own 9-Volt battery.? At the last minute, it was
modified to extract power from the TM-D700. The
Ariss vox box gets its power from the D700 via a special modification to the
D700 transceiver.
The unfiltered power
is full of RF energy when the D700 starts transmitting.
The RF energy causes the VOX PTT circuit to
get stuck in a transmitting mode until the Watch dog timer in the D700
times-out and forces the radio back to receiving mode.
Marexmg, the organization that supplied the Marex SpaceCam1 SSTV
software for ISS has recommended to ARISS several times to replace the ARISS
vox box with a stable USB vox box.
ARISS has repeatedly ignored any attempt to correct the
problem.
Sincerely
Miles WF1F? Marex
?
?
http://www.marexmg.org/fileshtml/futureprojects.html
________________________________
From: Fabiano Moser <fabianomoser@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Thursday, September 5, 2013 6:57 AM
Subject: [amsat-bb] Re: R: Re: ISS SSTV Active on 145.800Mhz
Hi,
SSTV active with problems, PTT was activated but no audio, then after
20seconds? the audio started and goes out before the end of image.
PTT still ON without audio till LOS.
On Thu, Sep 5, 2013 at 10:22 AM, Claudio Ariotti, IK1SLD <
claudio@xxxxxxx.xxx> wrote:
>
>
> Hi Jan, about your comment I read on your web, the Luca Parmitano don't use
> the Kenwood TM-D710, this radio is used by Russian crew.
> The MAI-75 Experiment is a Russian experiment and the crew activates it
> when
> Moscow has AOS, so we lost 50% of the pass.
> Luca only use the Ericsson radio in the Columbus module.
>
>? 73 Claudio IK1SLD
>
>
> -----Messaggio originale-----
> Da: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Per
> conto
> di PE0SAT | Amateur Radio
> Inviato: gioved? 5 settembre 2013 10:35
> A: amsat-bb@xxxxx.xxx
> Oggetto: [amsat-bb] Re: ISS SSTV Active on 145.800Mhz
>
> Hi Cor,
>
> Via this link: http://www.pe0sat.vgnet.nl/2013/iss-sstv-reception/ you can
> download the SSTV images I received yesterday.
>
>
> 73 Jan PE0SAT
>
> On 04-09-2013 20:47, Cor . wrote:
> > Hello All,
> >
> > Several ISS SSTV images are received from several ground stations.
> > See ISS SSTV images and info:
> > http://ariss-sstv.blogspot.nl/
> > http://www.dk3wn.info/satblog.shtml
> >
> > I asume the Russian ISS crew have sended 4 different SSTV images
> > today.
> > If someone have received other images please send them to
> > me via e-mail (see my QRZ.com page).
> >
> > Tommorow Sept. 5? between 09:00 and 10:40 UTC last day of the event.
> >
> >
> > 73's Cor PD0RKC
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> > author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> > program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> --
> With regards PE0SAT
> Internet web-page http://www.pe0sat.vgnet.nl/
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Thu, 5 Sep 2013 20:48:57 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: michael luft <milu111@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: S band LEO Sat tracking
Message-ID:
<1594298310.1578092.1378414137060.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxx
xxxx.xxx>
Content-Type: text/plain; charset=utf-8
When AO-51 used the S band downlink, I used a 18 inch TV dish with a 6 turn
helix feed connected to a AIDC 3731 (K5GNA) down converter. I do not know
the pointing accuracy as it was not used very much. On AO-40 (sobsob) I used
a 4 foot primestar dish (heavy) with the same feed and dc.
73 Bob W7LRD
----- Original Message -----
From: "michael luft" <milu111@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Thursday, September 5, 2013 2:59:29 AM
Subject: [amsat-bb] S band LEO Sat tracking
What kind of positioning accuracy can be expected form amateur PC Software
and Antenna Rotators? Or, in other words: What kind of S band antenna (
gain or dimensions) is needed to track a S band LEO Sat?
73
Michael
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Thu, 5 Sep 2013 16:53:26 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Rob <pabutusa@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-40 Replacement
Message-ID:
<CABzOSOoYEAaKvLH=iYvm+JzqxDVPNhiEZt2sss5anD_YPN4r8A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Get on AO-7! It's certainly no harder than FO-29 or VO-52. You just have to
know if it's in Mode A or B (see here http://oscar.dcarr.org/). For next
next few months, it will alternate between Mode A and B switching some time
around 0300Z every day. When it reaches a point where it's eclipsed on
every orbit (while in the southern portion of it's orbit during part of the
southern hemisphere winter and while in the northern portion of it's orbit
during part of the northern hemisphere winter), it will always be in Mode B
(or off if it's eclipsed). It can also act a little strange at times -
FMing of the transponder, etc. AO-7 is fun because it has the widest
footprint with decent opportunities to work into South America, Europe, and
even Africa (I've heard EA8 and CT3).
As stated earlier in this thread, if all goes well, we'll have three more
Mode B linear transponders in orbit by the end of the year (FUNCube-1,
UKube-1, and Delfi-N3xt), though I believe they are all slated to be in
orbits at an altitude similar to VO-52.
73,
Paul, N8HM
On Thu, Sep 5, 2013 at 4:28 PM, Rob <pabutusa@xxxxx.xxx> wrote:
> I miss linear transponders .... I grew up with the early RS birds
> particularly RS-6 and RS-8 .... I was only a "kid" in college ...
>
> If you're looking for EASY ENTRY .... MODE A ROCKS!
>
> That said .. I never bother with the FM birds .... tried once and it's was
> just a barrage of callsigns and grids ....
>
> I've been sticking with FO-29 and VO52 ... I need to give AO7 a try
>
> Also ..... if anyone is looking for a great transponder module for a cube
> sat ... look no further than the work of PE1RAH .... his transponder fits
> in a "cube" and is already flight proven ....
>
> High elliptical orbit satellites are cool .... harder to work ..... more
> transmit power ... receive preamps ... probably not entry level stuff ...
> I'd a rather see a couple LEO linear transponders rather than ONE HEO ...
>
> --> Rob, KA2PBT
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 8
Date: Thu, 5 Sep 2013 22:25:51 +0100
From: Fabiano Moser <fabianomoser@xxxxx.xxx>
To: MM <ka1rrw@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS SSTV Active on 145.800Mhz, Stuck PTT
Message-ID: <9EF4B6F7-D065-4050-A428-5B80FFB0F8EC@xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Hi Miles,
Thank you for your answer.
I also read the infomation on the link at end.
Fabiano Moser.
Enviado do meu iPhone
On 05/09/2013, at 21:45, MM <ka1rrw@xxxxx.xxx> wrote:
> The stuck PTT while running SSTV on ISS has been a known issue since the
vox box was first connected to the TM-D700 in the year 2005. The ISS crew
soon discovered the stuck VOX transmitter issue.
> One ISS crewmember left the radio running all night sending SSTV images.
The next morning the radio was excessively hot and would not respond to
button commands until after the radio was ?power cycled?.
>
> The Ariss vox box does not have any RF filtering inside the device. The
devices was originally designed to run on its own 9-Volt battery. At the
last minute, it was modified to extract power from the TM-D700. The Ariss
vox box gets its power from the D700 via a special modification to the D700
transceiver.
> The unfiltered power is full of RF energy when the D700 starts transmitting.
> The RF energy causes the VOX PTT circuit to get stuck in a transmitting
mode until the Watch dog timer in the D700 times-out and forces the radio
back to receiving mode.
>
> Marexmg, the organization that supplied the Marex SpaceCam1 SSTV software
for ISS has recommended to ARISS several times to replace the ARISS vox box
with a stable USB vox box.
> ARISS has repeatedly ignored any attempt to correct the problem.
> Sincerely
> Miles WF1F Marex
>
>
> http://www.marexmg.org/fileshtml/futureprojects.html
>
> From: Fabiano Moser <fabianomoser@xxxxx.xxx>
> To: amsat-bb <amsat-bb@xxxxx.xxx>
> Sent: Thursday, September 5, 2013 6:57 AM
> Subject: [amsat-bb] Re: R: Re: ISS SSTV Active on 145.800Mhz
>
> Hi,
>
> SSTV active with problems, PTT was activated but no audio, then after
> 20seconds? the audio started and goes out before the end of image.
> PTT still ON without audio till LOS.
>
>
>
>
> On Thu, Sep 5, 2013 at 10:22 AM, Claudio Ariotti, IK1SLD <
> claudio@xxxxxxx.xxx> wrote:
>
> >
> >
> > Hi Jan, about your comment I read on your web, the Luca Parmitano don't
use
> > the Kenwood TM-D710, this radio is used by Russian crew.
> > The MAI-75 Experiment is a Russian experiment and the crew activates it
> > when
> > Moscow has AOS, so we lost 50% of the pass.
> > Luca only use the Ericsson radio in the Columbus module.
> >
> > 73 Claudio IK1SLD
> >
> >
> > -----Messaggio originale-----
> > Da: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Per
> > conto
> > di PE0SAT | Amateur Radio
> > Inviato: gioved? 5 settembre 2013 10:35
> > A: amsat-bb@xxxxx.xxx
> > Oggetto: [amsat-bb] Re: ISS SSTV Active on 145.800Mhz
> >
> > Hi Cor,
> >
> > Via this link: http://www.pe0sat.vgnet.nl/2013/iss-sstv-reception/ you can
> > download the SSTV images I received yesterday.
> >
> >
> > 73 Jan PE0SAT
> >
> > On 04-09-2013 20:47, Cor . wrote:
> > > Hello All,
> > >
> > > Several ISS SSTV images are received from several ground stations.
> > > See ISS SSTV images and info:
> > > http://ariss-sstv.blogspot.nl/
> > > http://www.dk3wn.info/satblog.shtml
> > >
> > > I asume the Russian ISS crew have sended 4 different SSTV images
> > > today.
> > > If someone have received other images please send them to
> > > me via e-mail (see my QRZ.com page).
> > >
> > > Tommorow Sept. 5 between 09:00 and 10:40 UTC last day of the event.
> > >
> > >
> > > 73's Cor PD0RKC
> > >
> > >
> > >
> > > _______________________________________________
> > > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the
> > > author.
> > > Not an AMSAT-NA member? Join now to support the amateur satellite
> > > program!
> > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> > --
> > With regards PE0SAT
> > Internet web-page http://www.pe0sat.vgnet.nl/
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 9
Date: Thu, 05 Sep 2013 17:48:05 -0500
From: John Becker <w0jab@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: S band LEO Sat tracking
Message-ID: <52290A25.1030000@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Back when I found one like this -
http://www.newegg.com/Product/Product.aspx?Item=N82E16833997212
If I recall it was only about 45 bucks.
from a company that I no longer remember their name (input welcomed)
who was located in Florida someplace. Never had a problem once I got the
VHF and UHF and it all lined up on a 10 feet boom.
Had a downeast microwave pre amp on it.
John, W0JAB
------------------------------
Message: 10
Date: Thu, 5 Sep 2013 23:37:17 -0000
From: "John Stephensen" <kd6ozh@xxxxxxx.xxx>
To: "Robert Bruninga" <bruninga@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: A0 40 replacement (PSK31-Best of FM and
Linear!)
Message-ID: <EFFC86CA2FDB4E76AF62C368A1E1A09C@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The FM PA can be more efficient than the linear PA. If you constrain the FM
deviation to be very narrow you can get 6 dB greater power efficiency for FM
given a fixed peak envelope power ("HF Radio Systems and Circuits," page
59).
73,
John
KD6OZH
----- Original Message -----
From: "Robert Bruninga" <bruninga@xxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, September 05, 2013 12:44 UTC
Subject: [amsat-bb] A0 40 replacement (PSK31-Best of FM and Linear!)
>> As long as AMSAT-NA needs to concentrate on... Cubesats...
>> I would really like to see the pursuit of linear transponders...
>> on them instead of single-channel FM repeaters.
>
> We can have the best of BOTH FM and Linear!
>
>> But we used to use a ucc1 in the navy to receive messages.
>> http://www.virhistory.com/navy/rtty-mux-ucc1.htm
>> It would allow us to receive something like 16 or 32 separate traffic
> channels on one frequency.
>
> We have that now in PSK31. Up to 30 channels in a single audio channel.
> So the ideal AMSAT transponder is a linear receiver (on 28.120 MHz) and an
> FM downlink of that single channel on UHF. This has the advantage of 30
> individual linear uplinks to share amongst everyone, and the advantage of
> FM downlink so that everyone gets the same waterfall without added
> Doppler.
>
> It's a win/win. And it is FULL duplex so that everyone can transmit
> simultaneously and everyone can receive everyone simultaneously. What
> more fun can that be!!!
>
> See the design: http://aprs.org/psk31uplink2.html
>
> And it all fits on a single 3.4" circuit board. Easy to fit in any
> Cubesat. Two such flight ready boards are ready by the Brno University in
> the CZECH Republic.
>
> Bob, WB4APR
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Thu, 5 Sep 2013 19:52:43 -0400
From: Samudra Haque <samudra.haque@xxxxx.xxx>
To: M5AKA <m5aka@xxxxx.xx.xx>
Cc: Amsat-bb <Amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<CAJEM477Kc5VxpFcL5RHsAxrEf89oOJK4=kuatwz_6M2bCQR_2A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
Hello,
Perhaps my recent work may stimulate discussion in this thread, though it
has not been proven in Space yet, but ...
my George Washington University MAE dept. micropropulsion subsystems for
small spacecraft was highlighted in the September 3 issue of the School of
Engineering and Applied Sciences newsletter. If you have the time, please
see the following web video that shows the first ever firing of three
simultaneous microthrusters. These subsystems were developed under Dr.
Michael Keidar, and are products of the GWU Micro-Propulsion and
Nanotechnology Lab. It should play well in all web browsers, PC, Mac or
Mobile.
https://docs.google.com/file/d/0BzYYl-b0DOFWZ1U0RFBYdU93NW8/edit?usp=sharing
Thrust range is 1-50 uNs (impulse-bits, variable, programmable) per
channel. Different clustering/arraying/firing sequences possible. Available
2013. Looking for a ride to Space for qualification to higher TRL. We are
at TRL5+ now.
73 de Samudra/N3RDX
newsletter excerpt:
*The Micro-propulsion and Nanotechnology Laboratory (MpNL),* led by* Prof.
Michael Keidar (MAE), *participated in the 27th Annual AIAA/USU Conference
on Small Satellites, held August 10-15 in Logan, UT. *MAE doctoral student
Samudra Haque p*resented dual operational prototype hardware examples of
his research focus,* ?Micro-Cathode Arc Thruster (?CAT) Subsystem for
In-space Propulsion of Small Satellites,? *and explained to audiences its
applicability for space missions and its technology readiness level for
testing in the 2013 GWU/NASA Ames Research Center investigative project,
?Micro-Cathode Arc Thruster PhoneSat Experiment.?
*Micro-propulsion and Nanotechnology Laboratory (MpNL) *students have
successfully completed, for the first time ever, a full integration and
testing of a prototype 3-channel Micro-Cathode Arc Thruster (?CAT)
subsystem at NASA Ames Research Center (ARC). This was specifically
engineered for the ARC Center Innovation Fund 2013 award project,
?Micro-Cathode Arc Thruster PhoneSat Experiment.? The project was intended
to explore the viability of enabling the innovative Google Nexus
SmartPhone-powered series of small spacecraft to have full attitude and
orbit correction capabilities. Three of these spacecraft were flown and
operated in space in April 2013 onboard the Antares launcher by Orbital
Sciences from Wallops Flight Facility, VA.
On Fri, May 3, 2013 at 1:56 PM, M5AKA <m5aka@xxxxx.xx.xx> wrote:
> Can't remember if the links on the work of N1BCD were posted earlier:
>
> Video of presentation at
> http://www.ustream.tv/recorded/22959312/highlight/267762
>
> Slides
>
>
http://icubesat.files.wordpress.com/2012/06/icubesat-org-2012-c-1-1-_presentat
ion_brandon_201205231623.pdf
>
> IARU Coordination
> http://www.amsatuk.me.uk/iaru/formal_detail.php?serialnum=305
>
> 73 Trevor M5AKA
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 12
Date: Thu, 5 Sep 2013 20:43:50 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: Samudra Haque <samudra.haque@xxxxx.xxx>
Cc: Amsat-bb <Amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<CA+K5gzfJjp=4tv=RANhUQJcG4namm9YLQdRsCL+5XRx+pNxRiA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
What is the specific Impulse?
On Thursday, September 5, 2013, Samudra Haque wrote:
> Hello,
> Perhaps my recent work may stimulate discussion in this thread, though it
> has not been proven in Space yet, but ...
>
> my George Washington University MAE dept. micropropulsion subsystems for
> small spacecraft was highlighted in the September 3 issue of the School of
> Engineering and Applied Sciences newsletter. If you have the time, please
> see the following web video that shows the first ever firing of three
> simultaneous microthrusters. These subsystems were developed under Dr.
> Michael Keidar, and are products of the GWU Micro-Propulsion and
> Nanotechnology Lab. It should play well in all web browsers, PC, Mac or
> Mobile.
>
>
> https://docs.google.com/file/d/0BzYYl-b0DOFWZ1U0RFBYdU93NW8/edit?usp=sharing
>
> Thrust range is 1-50 uNs (impulse-bits, variable, programmable) per
> channel. Different clustering/arraying/firing sequences possible. Available
> 2013. Looking for a ride to Space for qualification to higher TRL. We are
> at TRL5+ now.
>
> 73 de Samudra/N3RDX
>
> newsletter excerpt:
>
> *The Micro-propulsion and Nanotechnology Laboratory (MpNL),* led by* Prof.
> Michael Keidar (MAE), *participated in the 27th Annual AIAA/USU Conference
> on Small Satellites, held August 10-15 in Logan, UT. *MAE doctoral student
> Samudra Haque p*resented dual operational prototype hardware examples of
> his research focus,* ?Micro-Cathode Arc Thruster (?CAT) Subsystem for
> In-space Propulsion of Small Satellites,? *and explained to audiences its
> applicability for space missions and its technology readiness level for
> testing in the 2013 GWU/NASA Ames Research Center investigative project,
> ?Micro-Cathode Arc Thruster PhoneSat Experiment.?
>
> *Micro-propulsion and Nanotechnology Laboratory (MpNL) *students have
> successfully completed, for the first time ever, a full integration and
> testing of a prototype 3-channel Micro-Cathode Arc Thruster (?CAT)
> subsystem at NASA Ames Research Center (ARC). This was specifically
> engineered for the ARC Center Innovation Fund 2013 award project,
> ?Micro-Cathode Arc Thruster PhoneSat Experiment.? The project was intended
> to explore the viability of enabling the innovative Google Nexus
> SmartPhone-powered series of small spacecraft to have full attitude and
> orbit correction capabilities. Three of these spacecraft were flown and
> operated in space in April 2013 onboard the Antares launcher by Orbital
> Sciences from Wallops Flight Facility, VA.
>
>
> On Fri, May 3, 2013 at 1:56 PM, M5AKA <m5aka@xxxxx.xx.xx <javascript:;>>
> wrote:
>
> > Can't remember if the links on the work of N1BCD were posted earlier:
> >
> > Video of presentation at
> > http://www.ustream.tv/recorded/22959312/highlight/267762
> >
> > Slides
> >
> >
>
http://icubesat.files.wordpress.com/2012/06/icubesat-org-2012-c-1-1-_presentat
ion_brandon_201205231623.pdf
> >
> > IARU Coordination
> > http://www.amsatuk.me.uk/iaru/formal_detail.php?serialnum=305
> >
> > 73 Trevor M5AKA
> >
> >
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx <javascript:;>. Opinions expressed are
> those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx <javascript:;>. Opinions expressed are those
> of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
--
Bob McGwier
Owner and Technical Director, Allied Communication, LLC
Professor Virginia Tech
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
------------------------------
Message: 13
Date: Thu, 05 Sep 2013 20:24:05 -0500
From: Les Rayburn <les@xxxxxxxxxxxx.xxx>
To: starcom-bb@xxxxxxxx.xxxx AMSAT Mailing List <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] N8RO/P in EN76
Message-ID: <52292EB5.8060508@xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks to the dedicated efforts of Ron, N8RO I've managed to work two
new grids today, including EN76. Both on FO-29, but I'm sure Ron has
also been active on SO-50---so if you're chasing grids be sure to listen
for him. Can't thank him enough for activating these grids.
Also had a long QSO last night on FO-29 with Ron, W5RKN and discussed
his upcoming amateur rocket launch. Ron is going for his Level 3
Certification Flight, which is a big deal indeed. I'm a BAR (Born Again
Rocketeer) who grew up flying Centuri model rockets. It was fascinating
to hear about Ron's efforts. Best of luck to him on the upcoming flight,
or as we say in the film business, "Break a Leg!".
Meet the most interesting people on the birds!
--
--
73,
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 35114
EM63nf
6M VUCC #1712
AMSAT #38965
Grid Bandits #222
Southeastern VHF Society
Central States VHF Society Life Member
Six Club #2484
Active on 6 Meters thru 1296, 10GHz & Light
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 299
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