| |
CX2SA > SATDIG 02.05.13 21:03l 870 Lines 27148 Bytes #999 (0) @ WW
BID : AMSATBB8141
Read: GUEST
Subj: AMSAT-BB-digest V8 141
Path: IZ3LSV<F1OYP<F4DUR<CX2SA
Sent: 130502/1902Z @:CX2SA.SAL.URY.SA #:5779 [Salto] FBB7.00e $:AMSATBB8141
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Imagine RIT Festival May 4th - AMSAT Fox-2 Maximum
PowerPoint Tracker Senior Design Project Exhibit (Bill W1PA)
2. Re: Path to HEO (Joe Leikhim)
3. Re: Path to HEO (Bob- W7LRD)
4. Re: Path to HEO (JoAnne Maenpaa)
5. Re: Path to HEO (Bryce Salmi)
6. NASA's First Mission Control Centre (B J)
7. Re: Fermi Avoids Near Miss In Orbit (Greg D)
8. AMSAT table at Cochise ARA hamfest (Sierra Vista AZ) on
Saturday morning (Patrick STODDARD (WD9EWK/VA7EWK))
9. Re: Fermi Avoids Near Miss In Orbit (B J)
10. Re: Path to HEO (Patrick Strasser)
11. Re: Fermi Avoids Near Miss In Orbit (M5AKA)
12. Call for Papers: 2013 Digital Communications Conference
(Ford, Steve, WB8IMY)
13. Re: [Forum] S-Band Downlink auf HEO/GEO noch sinnvoll? (i8cvs)
14. VHF Amps (Smaller) for Sale (Les Rayburn)
15. Re: [Forum] S-Band Downlink auf HEO/GEO noch sinnvoll?
(Peter Guelzow)
----------------------------------------------------------------------
Message: 1
Date: Wed, 1 May 2013 15:01:49 -0400
From: "Bill W1PA" <w1pa@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Imagine RIT Festival May 4th - AMSAT Fox-2
Maximum PowerPoint Tracker Senior Design Project Exhibit
Message-ID: <BAY157-ds1582295FEA214BAE28CD798BC0@xxx.xxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Nice job, Bryce.
Regards,
Bill W1PA
(RIT '87)
------------------------------
Message: 2
Date: Wed, 01 May 2013 17:33:04 -0400
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <51818A10.4040408@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thinking way outside the box, what about some sort of phased array using
dipoles, which has the boresight synthesized to point at earth. In other
words, don't use fuel to reorient the bird, electronically steer the
phase of the antennas so that earth is in focus.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 3
Date: Wed, 1 May 2013 22:34:44 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: g0mrf@xxx.xxx
Cc: nss@xxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<1774527611.647968.1367447684045.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
more outside the box thinking...you have a gun (of sorts) on the satellite.
Then fire to the rear forcing the little satellite faster in the opposite
direction. We could select from .22LR to 45 ACP. I realize the anti gun
folks would go bizerk. Back in my corner now.
73 Bob
w7LRD
----- Original Message -----
From: g0mrf@xxx.xxx
To: nss@xxx.xxxx glasbrenner@xxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Sent: Tuesday, April 30, 2013 1:35:08 PM
Subject: [amsat-bb] Re: Path to HEO
Hi all.
Deployable gain antennas are possible, but unfortunately attitude
control is a real issue. If the orbit has a high perigee then the
magnetic field for magnetorquing is minimal. With limited fuel and
little or no magnetic field, keeping the antennas pointing correctly is
difficult. Also, all of this getting to HEO is challenging given our
lack of experience with low mass / ion propulsion.
A compromise could be 4 Watts (ish) from MEO. That can be done with
omnidirectional antennas, so when the batteries die and the fuel is
exhausted we still have a useful satellite even if we cannot control
attitude.
Would be great to team up with a group who want to test a propulsion
system and apply for a launch opportunity.
Thanks
David
Here's an oldie but goodie..... http://www.g0mrf.com/MEOSAT.htm
-----Original Message-----
From: Joe <nss@xxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Tue, 30 Apr 2013 17:18
Subject: [amsat-bb] Re: Path to HEO
On the Outside? :-)
just like 90% of the earlier birds they are rolled or folded up until
after deployment. IIRC: one of the first actually did use a rolled up
tame measure for the elements.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/30/2013 9:51 AM, Andrew Glasbrenner wrote:
> Where do the gain antennas go on a 10x10x30cm HEO?
>
> 73, Drew KO4MA
>
> Sent from my iPhone
>
> On Apr 30, 2013, at 9:01 AM, N0JY <n0jy@xxxxxxx.xxx> wrote:
>
>> I wonder about the amount of time spent in the Van Allen belts on
the way up
there. We're concerned about radiation at a 650 km orbit, it might
take some
heavy duty ($$) radiation tolerant components to survive a few years
trip
through the radiation belts as well as the final high orbit?
>>
>> Jerry
>> N0JY
>>
>>
>>
>> _______________________________________________
>> 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
_______________________________________________
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: 4
Date: Wed, 1 May 2013 17:50:26 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: "'amsat-bb'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <001101ce46be$45f1ad00$d1d50700$@xxx>
Content-Type: text/plain; charset="us-ascii"
> Then fire to the rear forcing the little satellite faster
Yeah, but the control, er safety, folks won't give us enough "mass out
the ass" to propel us forward ... can't have a clip with 30 pretty
soon!
--
73 de JoAnne K9JKM
------------------------------
Message: 5
Date: Wed, 1 May 2013 20:46:17 -0400
From: Bryce Salmi <bts2637@xxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<CAN5j0sp4ofH_qbqq4eGHyhH9yvkYV3tjHoKhZBP874Et6p5SFw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I'll throw this one out there though I'm sure some of you already know
about it. "Rocket Propulsion Elements" is a pretty good book on the basics
of rocket propulsion. I've dabbled in it a few times but do plan on a more
comprehensive study (I'm an EE and actual coursework takes precedence over
this, when I graduate I'll have more time).
http://www.amazon.com/Rocket-Propulsion-Elements-7th-Edition/dp/0471326429/ref
=sr_1_2?ie=UTF8&qid=1367455314&sr=8-2&keywords=rocket+propulsion+elements
Bryce
KB1LQC
On Wed, May 1, 2013 at 6:50 PM, JoAnne Maenpaa <k9jkm@xxxxxxx.xxx> wrote:
> > Then fire to the rear forcing the little satellite faster
>
> Yeah, but the control, er safety, folks won't give us enough "mass out
> the ass" to propel us forward ... can't have a clip with 30 pretty
> soon!
>
> --
> 73 de JoAnne K9JKM
>
>
> _______________________________________________
> 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, 2 May 2013 03:29:40 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] NASA's First Mission Control Centre
Message-ID:
<CAP7QzkMComOFb+e0+EYHYsWdCRcwkGnXTcPMzbEHJAgym0cCFQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://www.nasa.gov/multimedia/podcasting/MCC-History.html
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 7
Date: Wed, 01 May 2013 21:06:24 -0700
From: Greg D <ko6th.greg@xxxxx.xxx>
To: B J <va6bmj@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fermi Avoids Near Miss In Orbit
Message-ID: <5181E640.2060901@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Um, the dates in the article are from 2012 (that be last year).
Interesting stuff, but why is NASA posting it now?
Greg KO6TH
B J wrote:
> http://www.nasa.gov/mission_pages/GLAST/news/bullet-dodge.html
>
> 73s
>
> Bernhard VA6BMJ @ DO33FL
> _______________________________________________
> 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: Wed, 1 May 2013 21:27:03 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AMSAT table at Cochise ARA hamfest (Sierra Vista
AZ) on Saturday morning
Message-ID:
<1367468823.83486.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi!
I will have an AMSAT table at the Cochise Amateur Radio Association's
Larry Warren Hamfest in Sierra Vista AZ this Saturday (4 May).? The
hamfest starts at 0700 local time (1400 UTC), running until the prize
drawing at noon (1900 UTC).? The hamfest is at the club's Green Acres
Field, east of Sierra Vista and the Fort Huachuca base on Moson Road,
south of AZ-90 in grid DM41.? More information about the hamfest is
available at:
http://www.k7rdg.org/
During the hamfest, WD9EWK will be on various satellite passes for
demonstrations to the hamfest crowd.? Please call if you hear WD9EWK
on the pass.? For the SSB satellites, I tend to start out about 10
kHz above the center of the transponder.? All QSOs will be uploaded
to the Logbook of the World after the hamfest.? If you would like to
receive a WD9EWK QSL card, please e-mail me directly with the QSO
details.? No card or SASE is required.
After the hamfest, I will drive to some of the rarely-heard grids
near the Arizona/New Mexico border.? If traffic and weather cooperate,
I hope to operate from the DM51/DM52 and/or the DM52/DM53 boundaries.
A good way to see where I am located is APRS, looking for WD9EWK-9:
http://aprs.fi/WD9EWK-9
In addition to APRS, I will try to post updates to my Twitter feed
(@xxxxxxx during Saturday from the hamfest and wherever else I
operate from.? For those not on Twitter, this is also available at:
http://twitter.com/WD9EWK
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 9
Date: Thu, 2 May 2013 05:09:13 +0000
From: B J <va6bmj@xxxxx.xxx>
To: Greg D <ko6th.greg@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fermi Avoids Near Miss In Orbit
Message-ID:
<CAP7QzkOnrcnM45+85HQ1S5HxK1dLBjxoGnQLk8VVca_t-2zFsA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On 5/2/13, Greg D <ko6th.greg@xxxxx.xxx> wrote:
> Um, the dates in the article are from 2012 (that be last year).
> Interesting stuff, but why is NASA posting it now?
Perhaps, for some reason, the incident was couldn't be publicized until now.
Also, in several of the space-related newsfeeds that I monitor, there
have been a few items concerning orbital clutter and debris. Maybe
this was meant to be added to the discussion.
73s
Bernhard VA6BMJ @ DO33FL
<snip>
------------------------------
Message: 10
Date: Thu, 02 May 2013 08:20:44 +0200
From: Patrick Strasser <patrick@xxxxxxxx.xxxx.xx>
To: Amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <518205BC.7060107@xxxxxxxx.xxxx.xx>
Content-Type: text/plain; charset=UTF-8
schrieb Ken Ernandes on 2013-04-30 09:49:
> I note the disclaimer at the bottom, so I'll help with the incorrect
assumptions.
>
> 1. g = 9.81 m/sec only applies to one Earth radius (i.e., the Earth's
surface). Gravitational acceleration drops of as an inverse square of the
radius.
> 2. GEO altitude is close to 36000 km, but GEO radius is approximately
42164 km (you must add the Earth's radius to altitude to get orbital radius)
Gotcha!
> Gravity can be simplified by using a constant MU = 398600.4418 km^3/sec^2
>
> For any radius you can compute g by:
>
> g = MU / r^2
>
> But make sure you use radius and not altitude. Mean Earth radius at
mid-latitudes is approximately 6371 km and is 6378 at the equator.
>
> The speed (v) for an elliptical orbit can be computed from the current
radius (r) and semi-major axis (a):
>
> v = sqrt(MU*(2/r - 1/a))
>
> This can be simplified for a circular orbit (r = a):
>
> v = sqrt(MU/a)
These are the formulas they did not tell us at school, thank you!
> The more important thing is what Dan Schultz pointed out. At 300 km
altitude, atmospheric drag is a significant factor in a continuous drain of
orbital energy. This is less at 500 km and almost insignificant starting
around 800 km. The drop off is because drag is:
>
> 1. proportional to atmospheric density which drops off quickly with
increased altitude.
> 2. also proportional to the square of the speed relative to the atmosphere.
>
> If you can get above 800 km without using up a lot of your fuel, you have
a chance to make something workable.
>From the last few cubesat rides I reckon that going there instead of
only to 300 km is not that impossible.
Regards
Patrick
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick at wirklich priv at>
------------------------------
Message: 11
Date: Thu, 2 May 2013 12:30:34 +0100 (BST)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: B J <va6bmj@xxxxx.xxx>, Greg D <ko6th.greg@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fermi Avoids Near Miss In Orbit
Message-ID:
<1367494234.17642.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
--- On Thu, 2/5/13, Greg D <ko6th.greg@xxxxx.xxx> wrote:
> Um, the dates in the article are from
> 2012 (that be last year).?
> Interesting stuff, but why is NASA posting it now?
Perhaps they are lobbying for funding for a debris mitigation program ?
73 Trevor M5AKA
------------------------------
Message: 12
Date: Thu, 2 May 2013 11:49:48 -0400
From: "Ford, Steve, WB8IMY" <wb8imy@xxxx.xxx>
To: "RTTY Reflector" <rtty-contesting@xxxx.xxx>, "AMSAT"
<amsat-bb@xxxxx.xxx>, "Digital Radio" <digitalradio@xxxxxxxxxxx.xxx>,
<vhf@xxxx.xxxxxxxx.xxx>
Subject: [amsat-bb] Call for Papers: 2013 Digital Communications
Conference
Message-ID:
<145372871023544E98881538F29B1DFC0570424B@xxxxxxxx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Amateurs are invited to submit papers for publication in the conference
proceedings of the ARRL/TAPR Digital Communications Conference that is
taking place September 20-22 in Seattle, WA. You do not have to attend
the conference to submit a paper for consideration.
Send papers by July 31 to:
Maty Weinberg
ARRL
225 Main St
Newington, CT 06111
. . . or by e-mail to maty@xxxx.xxx
Submissions will not be edited and authors will retain all rights.
73 . . . Steve Ford, WB8IMY
QST Editor in Chief and Publications Manager
ARRL -- the National Association for Amateur Radio
tel 860-594-0287
sford@xxxx.xxx
------------------------------
Message: 13
Date: Thu, 2 May 2013 18:24:27 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>, "Roberto" <iw5bsf@xxxxx.xx>,
<peter.guelzow@xxxxxx.xx>
Subject: [amsat-bb] Re: [Forum] S-Band Downlink auf HEO/GEO noch
sinnvoll?
Message-ID: <000001ce4752$07a27220$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Peter, DB2OS
I am still using a 120 cm (4 foot) parabolic dish for 2400 MHz and
I noted that when the elevation is about 10 degres above the horizon
here in the bay of Napoli there are not heavy interference from WiFi
tuning between 2400 to 2402 MHz so that actually the old OSCAR-40
(P3-D) S band is still usable here.
We need not a new S band but a new P3E satellite.
Best 73" de
i8CVS Domenico
> Hi there,
>
> many of us will certainly remember the Mode S downlink of AMSAT
> OSCAR-40 (P3-D) remember.
>
> After initial skepticism, especially after the 2m transmitter
> failed, Mode-S was indeed an amazing encouragement and was
> bad out of "Easy Mode".
> I myself can not in experiments with different antennas and
> Feeds remember, through the bathroom window in the direction of AO-40 ...
> The signals were glaskar and the tape clean, even weak stations
> were easy to understand ..
>
> 10 years later, each more than a 2.4 GHz WiFi wireless router,
> Laptop and smartphone in the house, the neighbors and office buildings
> around a
> around all ...
> In the country there are also many "citizen networks" with Wi-Fi to all
> Villages to provide them with inexpensive internet ...
>
> Probably the noise level is now very high, and even
> when working with parabolic antennas to heaven, you will be on the
> Sidelobes surely still a mess from all of WLANs
> Receive directions ... remains of the actual desired
> Useful signal probably little left ..
>
> Under these conditions would have an S-band downlink like you would with
> AO-40
> still have a chance?
>
> Has anyone had any experience in this regard and perhaps collected with
> a connected spectral antennas in all the times
> Rotated directions?
>
> Under https://www.facebook.com/amsat.deutschland there is a small
> To vote ..
>
>
> 73s Peter DB2OS
>
>
> ----- Original Message -----
> From: "Peter Guelzow" <peter.guelzow@xxxxxx.xx>
> To: "AMSAT - Forum" <Forum@xxxxxxxx.xxx>
> Sent: Wednesday, May 01, 2013 8:33 PM
> Subject: [Forum] S-Band Downlink auf HEO/GEO noch sinnvoll?
>
>
> Hallo zusammen,
>
> viele von uns werden sich bestimmt noch an die Mode-S Downlink von AMSAT
> OSCAR-40 (P3-D) erinnern.
>
> Nach anf?nglicher Skepsis, insbesondere nachdem der 2m-Sender
> ausgefallen war, fand Mode-S ja einen erstaunlichen Zuspruch und war
> schlecht hin der "Easy Mode".
> Ich selbst kann mich noch an Versuche mit verschiedenen Antennen und
> Feeds erinnern, durch das Badezimmer-Fenster in Richtung AO-40...
> Die Signale waren glaskar und das Band sauber, selbst schwache Stationen
> waren problemlos zu verstehen..
>
> 10 Jahre sp?ter hat jeder mehr als einen 2,4 GHz WiFi WLAN-Router,
> Laptop und Smartphone im Hause, die Nachbarn und B?rogeb?ude um einen
> herum auch alle...
> Auf dem Lande gibt es ja auch viele "B?rgernetze" mit WLAN um ganze
> D?rfer preiswert mit Internet zu versorgen...
>
> Wahrscheinlich ist der Grundrauschpegel inzwischen sehr hoch und selbst
> wenn man mit Parabolantennen gegen Himmel arbeitet, wird man ?ber die
> Nebenzipfel sicher noch ein Durcheinander von WLAN's aus allen
> Richtungen empfangen... dann bleibt von dem eigentlich gew?nschten
> Nutzsignal wohl wenig ?brig..
>
> H?tte unter diesen Bedingungen eine S-Band Downlink wie eben bei AO-40
> noch eine Chance?
>
> Hat jemand diesbez?glich schon Erfahrungen gesammelt und vielleicht mit
> einem angeschlossenen Spektralanalyse mal die Antennen in alle
> Richtungen gedreht?
>
> Unter https://www.facebook.com/amsat.deutschland gibt es eine kleine
> Abstimmung dazu..
>
>
> 73s Peter DB2OS
------------------------------
Message: 14
Date: Thu, 02 May 2013 11:33:53 -0500
From: Les Rayburn <les@xxxxxxxxxxxx.xxx>
To: VHF Contesting Reflector <vhfcontesting@xxxxxxxxxx.xxx>,
"vhf@xxxx.xxxxxxxx.xxxx <vhf@xxxx.xxxxxxxx.xxx>, AMSAT Mailing List
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] VHF Amps (Smaller) for Sale
Message-ID: <51829571.9040506@xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Cleaning out extra & backup items from the shack in an attempt to stave
off bankruptcy and the poor-house while paying for my daughter's
wedding. :-)
Selling off a few small amplifiers that may be of use to other VHF Weak
Signal fans. All amps are in good working condition. Cosmetically, they
are "USED",
meaning that they have the usual scratches, etc. No major dents, paint
loss, etc. Perfectly acceptable and XYL approved , but not mint from the
factory.
If you're not happy we'll make it right. Relax, it's just a hobby.
Prefer Paypal payment or USPS Money Order. Shipping via UPS Ground is
included in the price.
TE Systems Model 0510G 50-54 MHz (6 Meter) Linear Amplifier (SSB/CW/FM)
Serial #A7173
10 Watts input-150 Watts Output.
The amp is rated for 170 Watts Output, but I never drove it that hard.
This amp was modified by TE Systems to provide an RCA rear panel input
jack for PTT keying. You simply connect a footswitch, handheld PTT, or
amp keying line to this jack, close to ground, and the
amp keys. Saves wear and tear on the relay.
$225
TE Systems Model 1412G 144-148 MHz (2 Meter) Linear Amplifier (SSB/CW/FM)
Serial #38482
10 Watts input-190 Watts Output
This amp includes heavy duty power connector with Anderson Power-Poles.
TE Systems plug including RCA female PTT keying circuit. Simply attach a
footswitch, handswitch or amp keying line to this
connector, close to ground and amp keys. Saves wear and tear on the relay.
$250
Mirage A1015 50-52 MHz Linear Amplifier (SSB/CW/FM)
Serial #93-234
10 Watts Input-150 Watts Output
This amp includes heavy duty power connector with Anderson Power-Poles.
This is the non-G model, with the older brown face. Does not include RF
sensing switching, so you HAVE to use the RCA plug on the rear
to key the amp using a footswitch, handswitch, or amp key line. But then
again, who does weak signal work and doesn't do that anyway. Great
workhorse amp at a good price. Used mine with a Flex 1500. 5 watts input
pushes about 80 watts output.
$225
Advice to OM's with daughters. Start saving now!!! :-)
--
--
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
------------------------------
Message: 15
Date: Thu, 02 May 2013 20:43:28 +0200
From: Peter Guelzow <peter.guelzow@xxxxxx.xx>
To: i8cvs <domenico.i8cvs@xxx.xx>, AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: [Forum] S-Band Downlink auf HEO/GEO noch
sinnvoll?
Message-ID: <5182B3D0.6010000@xxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Domenico,
thanks - this is indeed very valuable input for me !
Maybe we are still lucky at the very low end of 2400,00 MHz of our
satellite band, because this is also the edge of the WiFi band...
No, I'm not considering a "new S-Band"...
I just want to be sure that when we will have a Downlink there, that it
is desirable and still usable...
best wishes
Peter DB2OS
On 02.05.2013 18:24, i8cvs wrote:
> Hi Peter, DB2OS
>
> I am still using a 120 cm (4 foot) parabolic dish for 2400 MHz and
> I noted that when the elevation is about 10 degres above the horizon
> here in the bay of Napoli there are not heavy interference from WiFi
> tuning between 2400 to 2402 MHz so that actually the old OSCAR-40
> (P3-D) S band is still usable here.
>
> We need not a new S band but a new P3E satellite.
>
> Best 73" de
>
> i8CVS Domenico
>
>> Hi there,
>>
>> many of us will certainly remember the Mode S downlink of AMSAT
>> OSCAR-40 (P3-D) remember.
>>
>> After initial skepticism, especially after the 2m transmitter
>> failed, Mode-S was indeed an amazing encouragement and was
>> bad out of "Easy Mode".
>> I myself can not in experiments with different antennas and
>> Feeds remember, through the bathroom window in the direction of AO-40 ...
>> The signals were glaskar and the tape clean, even weak stations
>> were easy to understand ..
>>
>> 10 years later, each more than a 2.4 GHz WiFi wireless router,
>> Laptop and smartphone in the house, the neighbors and office buildings
>> around a
>> around all ...
>> In the country there are also many "citizen networks" with Wi-Fi to all
>> Villages to provide them with inexpensive internet ...
>>
>> Probably the noise level is now very high, and even
>> when working with parabolic antennas to heaven, you will be on the
>> Sidelobes surely still a mess from all of WLANs
>> Receive directions ... remains of the actual desired
>> Useful signal probably little left ..
>>
>> Under these conditions would have an S-band downlink like you would with
>> AO-40
>> still have a chance?
>>
>> Has anyone had any experience in this regard and perhaps collected with
>> a connected spectral antennas in all the times
>> Rotated directions?
>>
>> Under https://www.facebook.com/amsat.deutschland there is a small
>> To vote ..
>>
>>
>> 73s Peter DB2OS
>>
>>
>> ----- Original Message -----
>> From: "Peter Guelzow" <peter.guelzow@xxxxxx.xx>
>> To: "AMSAT - Forum" <Forum@xxxxxxxx.xxx>
>> Sent: Wednesday, May 01, 2013 8:33 PM
>> Subject: [Forum] S-Band Downlink auf HEO/GEO noch sinnvoll?
>>
>>
>> Hallo zusammen,
>>
>> viele von uns werden sich bestimmt noch an die Mode-S Downlink von AMSAT
>> OSCAR-40 (P3-D) erinnern.
>>
>> Nach anf?nglicher Skepsis, insbesondere nachdem der 2m-Sender
>> ausgefallen war, fand Mode-S ja einen erstaunlichen Zuspruch und war
>> schlecht hin der "Easy Mode".
>> Ich selbst kann mich noch an Versuche mit verschiedenen Antennen und
>> Feeds erinnern, durch das Badezimmer-Fenster in Richtung AO-40...
>> Die Signale waren glaskar und das Band sauber, selbst schwache Stationen
>> waren problemlos zu verstehen..
>>
>> 10 Jahre sp?ter hat jeder mehr als einen 2,4 GHz WiFi WLAN-Router,
>> Laptop und Smartphone im Hause, die Nachbarn und B?rogeb?ude um einen
>> herum auch alle...
>> Auf dem Lande gibt es ja auch viele "B?rgernetze" mit WLAN um ganze
>> D?rfer preiswert mit Internet zu versorgen...
>>
>> Wahrscheinlich ist der Grundrauschpegel inzwischen sehr hoch und selbst
>> wenn man mit Parabolantennen gegen Himmel arbeitet, wird man ?ber die
>> Nebenzipfel sicher noch ein Durcheinander von WLAN's aus allen
>> Richtungen empfangen... dann bleibt von dem eigentlich gew?nschten
>> Nutzsignal wohl wenig ?brig..
>>
>> H?tte unter diesen Bedingungen eine S-Band Downlink wie eben bei AO-40
>> noch eine Chance?
>>
>> Hat jemand diesbez?glich schon Erfahrungen gesammelt und vielleicht mit
>> einem angeschlossenen Spektralanalyse mal die Antennen in alle
>> Richtungen gedreht?
>>
>> Unter https://www.facebook.com/amsat.deutschland gibt es eine kleine
>> Abstimmung dazu..
>>
>>
>> 73s Peter DB2OS
>
------------------------------
_______________________________________________
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 141
****************************************
Read previous mail | Read next mail
| |
