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CX2SA > SATDIG 09.08.08 17:08l 1020 Lines 34646 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO-7: out of eclipse? (Alan Cresswell)
2. Re: What happens when you loose a satellite (Nate Duehr)
3. Re: What happens when you loose a satellite (Trevor)
4. AMSAT-UK Colloquium: Mars Orbiter P5-A Presentation on BATC
site (Trevor)
5. AMSAT-UK Colloquium: Mars Orbiter P5-A Presentation on BATC
site (Trevor)
6. Help with ISS Boy Scout Contact (Ken Owen)
7. Re: brain picking time (Edward Cole)
8. qsl ao-51 data/telem (AT)9600 (Mr Jeffrey L Ross)
9. anyone want to digi via sat go-32 (AT)9600 (Mr Jeffrey L Ross)
10. Re: [eu-amsat] AMSAT UK P3E Lecture Available (John B. Stephensen)
11. Re: What happens when you loose a satellite (Rocky Jones)
12. Re: brain picking time (w7lrd(AT)comcast.net)
13. Santa Barbara Hamfest Demo Sunday (re-send) (Ken Owen)
----------------------------------------------------------------------
Message: 1
Date: Fri, 8 Aug 2008 20:04:52 -0000
From: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Subject: [amsat-bb] Re: AO-7: out of eclipse?
To: <amsat-bb(AT)amsat.org>
Message-ID: <000c01c8f992$06179790$0401010a(AT)Dell1>
Content-Type: text/plain; charset="us-ascii"
Hi Mak,
Well my home brew software tells me AO-07 is now out of eclipse but more
persuasive is the fact that for the first time last night I was able to
maintain contact with VK during what had been a steadily decreasing eclipse
zone here in the Southern hemisphere. I think you can take it that Nova is
correct.
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of SV1BSX
Sent: Thursday, 7 August 2008 15:17
To: eu-amsat(AT)yahoogroups.com
Cc: amsat-bb(AT)amsat.org
Subject: [amsat-bb] AO-7: out of eclipse?
Hi all,
as I read on AO-7's Online LogBook, today the Satellite "switched" on Mode-A
after a long time.
Looking for eclipse-periods, according to NOVA today (AT) 12:25 UTC it was
the
last Eclipse for the current season! The next one will be on 12th of May,
2009 .
However, according to Emily's Log that is not true, the end of eclipses
take place at October 2008.
http://www.planetemily.com/ao7/Eclipse.php
I wondering... Is it NOVA "true" or Emily's Log ?
73 de Mak, SV1BSX
Email: sv1bsx "AT" yahoo .gr
URL : http://sv1bsx.50webs.com
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
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------------------------------
Message: 2
Date: Fri, 08 Aug 2008 17:32:36 -0600
From: Nate Duehr <nate(AT)natetech.com>
Subject: [amsat-bb] Re: What happens when you loose a satellite
To: Keith & Jenny Sloan <keith(AT)sloan-home.co.uk>
Cc: amsat-bb(AT)amsat.org
Message-ID: <489CD794.20406(AT)natetech.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Keith & Jenny Sloan wrote:
> With things like the Falcon launch failure you obviously loose the
> satellite, but do you get
> another launch having paid you money or is that it. You loose everything
> if the launch fails
>
> If the later then the launch of P3E and P5A could prove very expensive
> if the launch fails.
From what I've heard, there's insurance for both the loss of the launch
and the payload.
Neither are cheap, from what I can gather as a casual bystander.
You can find references to the insurance in news articles about failed
launches of bigger "stuff", like the Dish Network failure to attain
orbit earlier this year.
It was up to Dish, the launcher, the operator, and the insurance company
as to what they would do when they realized they had a stage fail and
didn't get as high as they wanted to.
There was an option of using a moon-slingshot to get the bird to its
final orbit, but my reading of the articles led to them having two
problems: It would use a LOT of propellant, meaning the bird would have
a lot less useful life on-station than was originally expected, and
Boeing claims to have a PATENT on the technique. (Rolls eyes.)
Last I read, the mixture of those two things caused them to decide to
scrap the bird and take the insurance money.
Then I assume such a bird becomes the property of the Insurance company
and if possible, I assume they splash the bird, to "get it out of the
way" if possible (depending on the failure).
All of that can probably take a very long time if there's any variables
that might change things... but I don't know. This is all conjecture on
my part. Maybe it'll spurn some of the experts to come forward and tell
it like it really is? :-)
I'm sure those are lovely meetings, full of lots of lawyers. :-)
Nate WY0X
------------------------------
Message: 3
Date: Fri, 8 Aug 2008 23:44:13 +0000 (GMT)
From: Trevor <m5aka(AT)yahoo.co.uk>
Subject: [amsat-bb] Re: What happens when you loose a satellite
To: AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <470626.98854.qm(AT)web27207.mail.ukl.yahoo.com>
Content-Type: text/plain; charset=utf-8
--- On Thu, 7/8/08, Keith & Jenny Sloan <keith(AT)sloan-home.co.uk> wrote:
> With things like the Falcon launch failure you obviously
> loose the
> satellite, but do you get
> another launch having paid you money or is that it. You
> loose everything
> if the launch fails
>
> If the later then the launch of P3E and P5A could prove
> very expensive
> if the launch fails.
I'm not aware of any Amateur satellites that have had launch insurance.
If the launch fails you lose everything.
The bottom line is money, Amateur groups don't have a spare half million
dollars to buy insurance.
Many 'free' or very low cost launches tend to be on those rockets with the
highest risk of failure.
73 Trevor M5AKA
__________________________________________________________
Not happy with your email address?.
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------------------------------
Message: 4
Date: Sat, 9 Aug 2008 00:01:22 +0000 (GMT)
From: Trevor <m5aka(AT)yahoo.co.uk>
Subject: [amsat-bb] AMSAT-UK Colloquium: Mars Orbiter P5-A
Presentation on BATC site
To: AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <381155.58169.qm(AT)web27201.mail.ukl.yahoo.com>
Content-Type: text/plain; charset=utf-8
The Mars Orbiter P5-A Presentation video (lecture 11) is now on the BATC
website.
To access the video go to http://www.batc.tv/ and click on the 'Archive' icon
on the left.
Select which AMSAT-UK lecture you wish to watch then click the 'Play' (>)
icon.
Click on the icon between the 'Progress' bar and the 'Volume' bar to get full
screen viewing.
Lectures 4 and 5 are about the MoonLITE project which will be the first Lunar
mission by the United Kingdom.
Lectures 6, 7 and 8 are about the Delfi-C3 satellite
Lecture 9 is the P3-E satellite presentation given by AMSAT-DL President Peter
Guelzow DB2OS, see also 'Get into Orbit with AMSAT-DL's P3E-Satellite' at
http://www.p3e-satellite.org/index.pl?lang=en_EN
Lecture 10 will be the Amateur Radio Mars Orbiter P5-A given by Achim
Vollhardt DH2VA, see also 'GO-Mars with AMSAT-DL's P5A Mission' at
http://ticket-to-mars.org/index.pl?lang=en_EN
Still to be added:
Lecture 11 will be the Delfi-n3Xt next generation satellite presentation
Lecture 12 will be the presentation on the new GB4FUN vehicle given by Carlos
Eavis G0AKI
Lecture 13 will be the 2.3/3.4/5.6GHz Signal Generator for Satellite
Applications by Grant Hodgson G8UBN
Lectures 14/15 will be the Band planning for satellite operations on
frequencies in the Amateur Service by Hans van de Groenendaal ZS6AKV,
President AMSAT-SA followed by the IARU Satellite Forum.
The full lecture programme (with video lecture numbers) can be seen at:
http://www.uk.amsat.org/content/view/640/213/
The PowerPoint presentation slides can be viewed at:
http://www.uk.amsat.org/content/view/664/235/
Pictures from the event can be seen at:
http://www.uk.amsat.org/gallery2
AMSAT-UK publish a newletter OSCAR News which is full of Amateur Satellite
information. Join online at https://secure.amsat.org.uk/subscription/
For further details contact Jim Heck G3WGM.
Tel: +44 (0)1258 453959
Email: g3wgm(AT)amsat.org
Web: http://www.uk.amsat.org/
----
73 Trevor M5AKA
__________________________________________________________
Not happy with your email address?.
Get the one you really want - millions of new email addresses available now at
Yahoo! http://uk.docs.yahoo.com/ymail/new.html
------------------------------
Message: 5
Date: Sat, 9 Aug 2008 00:02:26 +0000 (GMT)
From: Trevor <m5aka(AT)yahoo.co.uk>
Subject: [amsat-bb] AMSAT-UK Colloquium: Mars Orbiter P5-A
Presentation on BATC site
To: AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <550357.43965.qm(AT)web27208.mail.ukl.yahoo.com>
Content-Type: text/plain; charset=utf-8
The Mars Orbiter P5-A Presentation video (lecture 10) is now on the BATC
website.
To access the videos go to http://www.batc.tv/ and click on the 'Archive' icon
on the left.
Select which AMSAT-UK lecture you wish to watch then click the 'Play' (>)
icon.
Click on the icon between the 'Progress' bar and the 'Volume' bar to get full
screen viewing.
Lectures 4 and 5 are about the MoonLITE project which will be the first Lunar
mission by the United Kingdom.
Lectures 6, 7 and 8 are about the Delfi-C3 satellite
Lecture 9 is the P3-E satellite presentation given by AMSAT-DL President Peter
Guelzow DB2OS, see also 'Get into Orbit with AMSAT-DL's P3E-Satellite' at
http://www.p3e-satellite.org/index.pl?lang=en_EN
Lecture 10 will be the Amateur Radio Mars Orbiter P5-A given by Achim
Vollhardt DH2VA, see also 'GO-Mars with AMSAT-DL's P5A Mission' at
http://ticket-to-mars.org/index.pl?lang=en_EN
Still to be added:
Lecture 11 will be the Delfi-n3Xt next generation satellite presentation
Lecture 12 will be the presentation on the new GB4FUN vehicle given by Carlos
Eavis G0AKI
Lecture 13 will be the 2.3/3.4/5.6GHz Signal Generator for Satellite
Applications by Grant Hodgson G8UBN
Lectures 14/15 will be the Band planning for satellite operations on
frequencies in the Amateur Service by Hans van de Groenendaal ZS6AKV,
President AMSAT-SA followed by the IARU Satellite Forum.
The full lecture programme (with video lecture numbers) can be seen at:
http://www.uk.amsat.org/content/view/640/213/
The PowerPoint presentation slides can be viewed at:
http://www.uk.amsat.org/content/view/664/235/
Pictures from the event can be seen at:
http://www.uk.amsat.org/gallery2
AMSAT-UK publish a newletter OSCAR News which is full of Amateur Satellite
information. Join online at https://secure.amsat.org.uk/subscription/
For further details contact Jim Heck G3WGM.
Tel: +44 (0)1258 453959
Email: g3wgm(AT)amsat.org
Web: http://www.uk.amsat.org/
----
73 Trevor M5AKA
__________________________________________________________
Not happy with your email address?.
Get the one you really want - millions of new email addresses available now at
Yahoo! http://uk.docs.yahoo.com/ymail/new.html
------------------------------
Message: 6
Date: Fri, 8 Aug 2008 21:29:17 -0700
From: "Ken Owen" <n6kth(AT)n6kth.com>
Subject: [amsat-bb] Help with ISS Boy Scout Contact
To: <amsat-bb(AT)amsat.org>
Message-ID: <000801c8f9d8$7d10bc00$2e01a8c0(AT)CIR2>
Content-Type: text/plain; charset="us-ascii"
Hi folks:
I will be setting up the station that will contact the ISS in less than two
weeks on behalf of the Santa Barbara Amateur Radio Club and a local Boy
Scout troop. The contact is scheduled, and we have the necessary equipment.
I would like to make sure in advance that my station is tracking the ISS
correctly. I wonder if anyone is currently making any ISS contacts (of the
not so pre-arranged type) and whether the cross-band repeater is in use.
I've listened on 145.800 for a couple of passes, but I've not heard anything
yet.
I appreciate any advice from those who have done this before.
Thanks,
Ken Owen, N6KTH
AMSAT Area Coordinator
------------------------------
Message: 7
Date: Sat, 09 Aug 2008 00:05:15 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: brain picking time
To: w7lrd(AT)comcast.net, "i8cvs" <domenico.i8cvs(AT)tin.it>, "AMSAT-BB"
<AMSAT-BB(AT)AMSAT.Org>
Message-ID: <200808090805.m7985IWC026733(AT)malik.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Bob,
The problem with using a helix is that you need to switch circular
polarity back-n-forth on eme everytime you swich from Tx to Rx. A
helix is usable for only one sense of circular pol and near
impossible to switch. Two helices would be nearly impossible to wind
on the same common axis like your dual band helical. I strongly urge
you to think about using a septum feed on 1296.
73 Ed
At 11:28 PM 8/8/2008, w7lrd(AT)comcast.net wrote:
>Hello Domenico & all
>Thanks for all the information. The measured F/D ratio works out
>to 0.375, therefore a patch would be appropriate. As mentioned
>earlier I would be content to just be able to receive EME (for
>now). For transmitting no doubt a different feed would be
>needed. Currently I am looking around for a preamp. I built a dual
>helix feed I am going to use on a four foot primestar off center
>dish. I used to receive on AO40 (sobsob) with a 3731AA
>downconverter. This same system will be used for transmitting (L
>band) on our next HEO. Maybe by planning and working toward the
>next HEO will generate more intense drive by all concerned. I can
>mount the 70 watt amp behind the 12 foot TVRO as suggested. Could a
>short helix be used for receive on the big dish? They are easier to
>build as opposed to a patch. All this work (fun) will help fill the
>void untill the next HEO. Fr om what I am reading on the BB I could
>be at this for a long time. Any additional information would be
>helpfull, perhaps others can get something out of this. I have some
>pictures of the dish, dual helix I can send upon request.
>73 Bob W7LRD
>Seattle
>
>--
>"if this were easy, everyone would be doing it"
>
>-------------- Original message --------------
>From: "i8cvs" <domenico.i8cvs(AT)tin.it>
>Hi Bob, W7LRD
>
>Before to start anyting you must to know the F/D ratio of your dish
>because this parameter will tell you if a patch as
>a feed is suitable or not for it.
>
>If your TVRO dish is a prime focus dish to measure the F/D ratio is
>very easy
>
>Put your dish horizontal on the ground looking up 90 degrees and
>strain a rope passing just through the center of the mouth and
>measure the diameter D
>
>Measure the depth of the dish just from the center of the mouth
>between the rope and the bottom of the dish and call the deepth c
>
>2
> D
> D
>F/D = ----------------- and the focal point F
>= -------------- from the bottom of the dish
> 16 x
> c 16 x c
>
>If the F/D ratio is less than 0.5 then a patch can be used but if
>F/D is greater then 0.5 then a patch is not suitable.
>
>By the way a patch as a feed is not used at all for EME because
>there are type of specialized feed that are much and much better.
>
>If the F/D ratio is less of 0.5 then a VE4MA feed can be used and if
>the F/D ratio is greater of 0,5 then a dual mode dish W2IMU must be used.
>
>Both VE4MA and W2IMU are dual port feeds one the LHCP is used to
>transmit and the other one the RHCP is used to receive.
>
>Waiting for P3E and depending of the F/D ratio of a 5 meter dish
>that I plan to build for 1296 MHz EME I have already built both a
>VE4MA and a W2IMU feeds in order to be prepared for EME in the
>future because unfortunately the future seems to be not bright for
>the HEO satellites.
>
>73" de
>
>i8CVS Domenico
>
>----- Original Message -----
>From: <mailto:w7lrd(AT)comcast.net>w7lrd(AT)comcast.net
>To: <mailto:kl7uw(AT)acsalaska.net>Edward Cole ;
><mailto:domenico.i8cvs(AT)tin.it>i8cvs ; <mailto:AMSAT-BB(AT)AMSAT.Org>AMSAT-
BB
>Sent: Wednesday, August 06, 2008 7:39 AM
>Subject: Re: [amsat-bb] Re: brain picking time
>
>Ed and all
>Many thanks for the information from many of you. I realize I will
>need a preamp. For now I will be content to see what I can
>hear. As you can guess once I can copy signals I will want to join
>in. That will require at very least mounting the amp at the antenna
>and a sequencer. I have seen W0LMD' web site as well as several
>others. I want to start out slow, before I "lose it".
>73 Bob W7LRD
>
>
>--
>"if this were easy, everyone would be doing it"
>
>-------------- Original message --------------
>From: Edward Cole <kl7uw(AT)acsalaska.net>
>
> > Domenico,
> >
> > You said it well. I forgot to mention that polarity sense will
> > reverse upon reflection at the dish surface, so the feed sense should
> > be Rx=RHCP; Tx=LHCP. In other discussions about using a patch for
> > eme, concern has been about sidelobe performance and high power
> > rating of the patch if full QRO eme is considered. Up to 200w it
> > probably is OK.
> >
> > I assumed that Bob was savy enough about microwave weak-signals to
> > know that on eme a preamp is not a luxury but an absolute
> > necessity. LMR-400 would be fine for connection from the preamp to
> > the receiver in the shack, if at least 15-dB net gain is left after
> > the cable loss is subtracted. More gain is desirable if the receive r
> > NF is high. A preamp of 0.3 dBNF is standard at 1296 for eme.
> >
> > I have a WD5AGO two-stage preamp with 0.30dBNF and 31-dBgain bought
> > from Radio Astronomy Supply.
> >
> > 73 Ed - KL7UW
> >
> > At 05:54 PM 8/5/2008, i8cvs wrote:
> > >----- Original Message -----
> > >From: "Edward Cole"
> > >To: ; "AMSAT-BB"
> > >Sent: Tuesday, August 05, 2008 8:24 AM
> > >Subject: [amsat-bb] Re: brain picking time
> > >
> > >At 04:35 PM 8/4/2008, w7lrd(AT)comcast.net wrote:
> > >
> > > >Next question- which probably would be more aimed at a EME bb. I
> > > >have a 12 foot TVRO I am building a patch feed for 1296, and feed it
> > > >through 50 feet of LMR400 to my IC-1271A. I want to see if I am
> > > >able to "hear" EME signals. Of course if I am able to, you can
> > > >g u ess what my next effort will be. This will be a cheapie effort as
> > > >I am only using stuff I already have. I do have a KJ6KO L band 70 watt
> > >amp.
> > > >73 Bob W7LRD
> > > >Seattle
> > >
> > > > Bob,
> > > >
> > > > Is your patch feed circular polar? EME on 1296 is RHCP in transmit
> > > > and LHCP in receive.
> > >
> > >Hi Ed, KL7UW
> > >
> > >It is best to specify to Bob that on 1296 MHz the dish in transmit must
> > >radiate RHCP in direction of the moon so that the patch or any other
> > >feed must radiate LCHP in direction of the surface of the dish.
> > >
> > > > The switch of polarity sense is due to the fact
> > > > that reflection at the moon reverses the sense of polarization.
> > >
> > >OK
> > >So that on receiving the wave coming from the moon is received LHCP
>>
>; ; ; ; ; & gt;over the surface of the dish but the dish reverse by
>reflection the signal
> > >in direction of the feed that must be made RHCP polarized on receiving.
> > >
> > >In addition a TVRO dish works well with a patch feed if the F/D ratio of
> > >the dish is ranging from 0.35 to 0.45
> > >
> > > > might be difficult to achieve with a patch feed.
> > >
> > >W0LMD make a patch feed for RHCP and LHCP but never I tested it
> > >
> > >Since the target of Bob is to see if he is able to only "hear"
> EME signals
> > >at 1296 MHz without to complicate his life I suggest at the very
> beginning
> > >to build only a patch feed RHCP polarized.
> > >
> > >To receive a 1296 EME signal with a 12 foot TVRO and a IC-1271A
> > >it is strictly necessary to connect directly to the patch connector a low
> > >noise preamplifier with a NF in the order of 0.5 dB
>&g t; & gt; ;
>&g t; >Since the gain of a low noise EME preamplifier for 1296 MHz is
> > >in the order of 30 dB or more then 50 feet of LMR400 connected from
> > >the output of the preamplifier up to the input of the IC-1271A will not
> > >deteriorate the overall NF of the system that will be only a little bit
> > >higher than 0.5 dB
> > >
> > > > 73 Ed - KL7UW
> > >
> > >73" de
> > >
> > >i8CVS Domenico
> >
>
>From: w7lrd(AT)comcast.net
>To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "Edward Cole"
><kl7uw(AT)acsalaska.net>, "AMSAT-BB" <AMSAT-BB(AT)AMSAT.Org>
>Subject: Re: [amsat-bb] Re: brain picking time
>Date: Sat, 09 Aug 2008 07:17:14 +0000
>Content-Type: Multipart/mixed;
> boundary="NextPart_Webmail_9m3u9jl4l_3405_1218266937_2"
>
>From: w7lrd(AT)comcast.net
>To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "Edward Cole"
><kl7uw(AT)acsalaska.net>, "AMSAT-BB" <AMSAT-BB(AT)AMSAT.Org>
>Subject: Re: [amsat-bb] Re: brain picking time
>Date: Sat, 09 Aug 2008 07:09:09 +0000
>Content-Type: Multipart/mixed;
> boundary="NextPart_Webmail_9m3u9jl4l_27280_1218266234_2"
>
>
------------------------------
Message: 8
Date: Sat, 9 Aug 2008 09:28:56 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] qsl ao-51 data/telem (AT)9600
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <003501c8fa23$e0732120$6401a8c0(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
hi folks, I just copied ao-51 downlink (AT)9600 baud. This is a first with
this sat here for me so I'm Really Happy.
Thanks AMSAT-NA.
You know what for! (turning up the power) hi
kc8gkf
here it is:
PECHO-11*>PBLIST <UI>:
PB: Empty.
PACBLS-8*>PACBLS-8 <UI>:
PACBLS S Meter = 0
PECHO-11*>STATUS <UI>:
B: 120900539
PECHO-11*>PBLIST <UI>:
PB: Empty.
PACBLS-8*>PACBLS-8 <UI>:
PACBLS S Meter = 0
PACB-1*>TLMI-1 <UI>:
H$6 ZRX
WdM3
!"#$w%&'p()*k+r,c-x.9/d0C12s3s456789`:;<=H>?(AT)AB;CD=E=FG`HIJKLM
PACB-1*>TLMS-1 <UI>:
C0:0D C1:44 C2:76 C3:2F C4:04 C5:01
PECHO-11*>PBLIST <UI>:
PB: Empty.
PECHO-11*>PBLIST <UI>:
PB: Empty.
PACB-1*>TLMS-1 <UI>:
C0:0D C1:44 C2:76 C3:2F C4:04 C5:01
PECHO-12*>BBSTAT <UI>:
Open ABCD:
PECHO-11*>STATUS <UI>:
B: 120900539
PACB-1*>LSTAT <UI>:
I P:0x13A8 o:0 l:27208 f:27245, d:1 st:6 e:8b
PECHO-11*>PBLIST <UI>:
PB: Empty.
------------------------------
Message: 9
Date: Sat, 9 Aug 2008 10:16:39 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] anyone want to digi via sat go-32 (AT)9600
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <000501c8fa2a$8b0c51f0$6401a8c0(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
hi folks, anyone want to try and digi to each other via the go-32 sat? Just
a short link is all we would have time for but it would be neat to do.
We need to find out what freq and call we are to use too. If so contact me
off list.
73 all
kc8gkf West Michigan USA
p.s. does anyone know where the go-32 aprs web page satgate is? And is it
working?
------------------------------
Message: 10
Date: Fri, 8 Aug 2008 20:14:45 -0000
From: "John B. Stephensen" <kd6ozh(AT)comcast.net>
Subject: [amsat-bb] Re: [eu-amsat] AMSAT UK P3E Lecture Available
To: "Luc Leblanc" <lucleblanc6(AT)videotron.ca>,
<eu-amsat(AT)yahoogroups.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <001501c8f993$67414a60$0201a8c0(AT)your6bvpxyztoq>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I've been hearing these two statments from AMSAT-NA officals for at least 2
years -- in person and on this BB.
73,
John
KD6OZH
----- Original Message -----
From: "Luc Leblanc" <lucleblanc6(AT)videotron.ca>
>
> Very nice presentations. One attract my attention was made by Peter
> Guelzow DB2OS one one of his slide we can read:
>
> ATTRACTIVENESS OF AMATEUR RADIO HAS DROPPED SIGNIFICANTLY
>
> FUNDING A SATELLITE FROM AMATEUR RESSOURCES ALONE NEVER WORKED BEFORE AND
> WILL NOT WORK NOW.
>
> I don't how to explain how all the wisdom and reality knowledge seems to
> be concentrated in Europe when speaking about amateur satellite?
------------------------------
Message: 11
Date: Fri, 8 Aug 2008 22:51:47 -0500
From: Rocky Jones <orbitjet(AT)hotmail.com>
Subject: [amsat-bb] Re: What happens when you loose a satellite
To: Trevor <m5aka(AT)yahoo.co.uk>, AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <BAY111-W51E2891CCF0822A506BEB6D6770(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Launch insurance...
I could be wrong but I think that Phase 3A had an insurance policy (if memory
serves)...the Ariane IV went Bang...
do I recall this correctly?
Robert WB5MZO> Date: Fri, 8 Aug 2008 23:44:13 +0000> From:
m5aka(AT)yahoo.co.uk> To: amsat-bb(AT)amsat.org> Subject: [amsat-bb] Re: What
happens when you loose a satellite> > --- On Thu, 7/8/08, Keith & Jenny Sloan
<keith(AT)sloan-home.co.uk> wrote:> > With things like the Falcon launch
failure you obviously> > loose the > > satellite, but do you get> > another
launch having paid you money or is that it. You> > loose everything > > if the
launch fails> > > > If the later then the launch of P3E and P5A could prove> >
very expensive > > if the launch fails.> > I'm not aware of any Amateur
satellites that have had launch insurance. > If the launch fails you lose
everything. > > The bottom line is money, Amateur groups don't have a spare
half million dollars to buy insurance. > > Many 'free' or very low cost
launches tend to be on those rockets with the highest risk of failure.> > 73
Trevor M5AKA> > > >
__________________________________________________________> Not happy with
your email!
address?.> Get the one you really want - millions of new email addresses
available now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html> >
_______________________________________________> Sent via AMSAT-
BB(AT)amsat.org. 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
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------------------------------
Message: 12
Date: Sat, 09 Aug 2008 07:28:57 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] Re: brain picking time
To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "Edward Cole"
<kl7uw(AT)acsalaska.net>, "AMSAT-BB" <AMSAT-BB(AT)amsat.org>
Message-ID:
<080920080728.3405.489D4738000C2A9100000D4D22155754740B9D04C999(AT)comca
st.net>
Content-Type: text/plain; charset="us-ascii"
Hello Domenico & all
Thanks for all the information. The measured F/D ratio works out to 0.375,
therefore a patch would be appropriate. As mentioned earlier I would be
content to just be able to receive EME (for now). For transmitting no doubt a
different feed would be needed. Currently I am looking around for a preamp.
I built a dual helix feed I am going to use on a four foot primestar off
center dish. I used to receive on AO40 (sobsob) with a 3731AA
downconverter. This same system will be used for transmitting (L band) on our
next HEO. Maybe by planning and working toward the next HEO will generate
more intense drive by all concerned. I can mount the 70 watt amp behind the
12 foot TVRO as suggested. Could a short helix be used for receive on the big
dish? They are easier to build as opposed to a patch. All this work (fun)
will help fill the void untill the next HEO. From what I am reading on the BB
I could be at this for a long time. Any additional information would be helpf
ull, p
erhaps others can get something out of this. I have some pictures of the
dish, dual helix I can send upon request.
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Hi Bob, W7LRD
Before to start anyting you must to know the F/D ratio of your dish because
this parameter will tell you if a patch as
a feed is suitable or not for it.
If your TVRO dish is a prime focus dish to measure the F/D ratio is very easy
Put your dish horizontal on the ground looking up 90 degrees and strain a
rope passing just through the center of the mouth and measure the diameter D
Measure the depth of the dish just from the center of the mouth between the
rope and the bottom of the dish and call the deepth c
2
D
D
F/D = ----------------- and the focal point F = ------------
-- from the bottom of the dish
16 x c
16 x c
If the F/D ratio is less than 0.5 then a patch can be used but if F/D is
greater then 0.5 then a patch is not suitable.
By the way a patch as a feed is not used at all for EME because there are type
of specialized feed that are much and much better.
If the F/D ratio is less of 0.5 then a VE4MA feed can be used and if the F/D
ratio is greater of 0,5 then a dual mode dish W2IMU must be used.
Both VE4MA and W2IMU are dual port feeds one the LHCP is used to transmit and
the other one the RHCP is used to receive.
Waiting for P3E and depending of the F/D ratio of a 5 meter dish that I plan
to build for 1296 MHz EME I have already built both a VE4MA and a W2IMU feeds
in order to be prepared for EME in the future because unfortunately the future
seems to be not bright for the HEO satellites.
73" de
i8CVS Domenico
----- Original Message -----
From: w7lrd(AT)comcast.net
To: Edward Cole ; i8cvs ; AMSAT-BB
Sent: Wednesday, August 06, 2008 7:39 AM
Subject: Re: [amsat-bb] Re: brain picking time
Ed and all
Many thanks for the information from many of you. I realize I will need a
preamp. For now I will be content to see what I can hear. As you can guess
once I can copy signals I will want to join in. That will require at very
least mounting the amp at the antenna and a sequencer. I have seen W0LMD' web
site as well as several others. I want to start out slow, before I "lose it".
73 Bob W7LRD
--
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: Edward Cole <kl7uw(AT)acsalaska.net>
> Domenico,
>
> You said it well. I forgot to mention that polarity sense will
> reverse upon reflection at the dish surface, so the feed sense should
> be Rx=RHCP; Tx=LHCP. In other discussions about using a patch for
> eme, concern has been about sidelobe performance and high power
> rating of the patch if full QRO eme is considered. Up to 200w it
> probably is OK.
>
> I assumed that Bob was savy enough about microwave weak-signals to
> know that on eme a preamp is not a luxury but an absolute
> necessity. LMR-400 would be fine for connection from the preamp to
> the receiver in the shack, if at least 15-dB net gain is left after
> the cable loss is subtracted. More gain is desirable if the receive r
> NF is high. A preamp of 0.3 dBNF is standard at 1296 for eme.
>
> I have a WD5AGO two-stage preamp with 0.30dBNF and 31-dBgain bought
> from Radio Astronomy Supply.
>
> 73 Ed - KL7UW
>
> At 05:54 PM 8/5/2008, i8cvs wrote:
> >----- Original Message -----
> >From: "Edward Cole"
> >To: ; "AMSAT-BB"
> >Sent: Tuesday, August 05, 2008 8:24 AM
> >Subject: [amsat-bb] Re: brain picking time
> >
> >At 04:35 PM 8/4/2008, w7lrd(AT)comcast.net wrote:
> >
> > >Next question- which probably would be more aimed at a EME bb. I
> > >have a 12 foot TVRO I am building a patch feed for 1296, and feed it
> > >through 50 feet of LMR400 to my IC-1271A. I want to see if I am
> > >able to "hear" EME signals. Of course if I am able to, you can
> > >g u ess what my next effort will be. This will be a cheapie effort as
> > >I am only using stuff I already have. I do have a KJ6KO L band 70 watt
> >amp.
> > >73 Bob W7LRD
> > >Seattle
> >
> > > Bob,
> > >
> > > Is your patch feed circular polar? EME on 1296 is RHCP in transmit
> > > and LHCP in receive.
> >
> >Hi Ed, KL7UW
> >
> >It is best to specify to Bob that on 1296 MHz the dish in transmit must
> >radiate RHCP in direction of the moon so that the patch or any other
> >feed must radiate LCHP in direction of the surface of the dish.
> >
> > > The switch of polarity sense is due to the fact
> > > that reflection at the moon reverses the sense of polarization.
> >
> >OK
> >So that on receiving the wave coming from the moon is received LHCP
> ; ; ; ; & gt;over the surface of the dish but the dish reverse by reflection
the signal
> >in direction of the feed that must be made RHCP polarized on receiving.
> >
> >In addition a TVRO dish works well with a patch feed if the F/D ratio of
> >the dish is ranging from 0.35 to 0.45
> >
> > > might be difficult to achieve with a patch feed.
> >
> >W0LMD make a patch feed for RHCP and LHCP but never I tested it
> >
> >Since the target of Bob is to see if he is able to only "hear" EME signals
> >at 1296 MHz without to complicate his life I suggest at the very beginning
> >to build only a patch feed RHCP polarized.
> >
> >To receive a 1296 EME signal with a 12 foot TVRO and a IC-1271A
> >it is strictly necessary to connect directly to the patch connector a low
> >noise preamplifier with a NF in the order of 0.5 dB
&g t; & gt; ;
&g t; >Since the gain of a low noise EME preamplifier for 1296 MHz is
> >in the order of 30 dB or more then 50 feet of LMR400 connected from
> >the output of the preamplifier up to the input of the IC-1271A will not
> >deteriorate the overall NF of the system that will be only a little bit
> >higher than 0.5 dB
> >
> > > 73 Ed - KL7UW
> >
> >73" de
> >
> >i8CVS Domenico
>
------------------------------
Message: 13
Date: Sat, 9 Aug 2008 07:32:48 -0700
From: "Ken Owen" <n6kth(AT)n6kth.com>
Subject: [amsat-bb] Santa Barbara Hamfest Demo Sunday (re-send)
To: <amsat-bb(AT)amsat.org>
Message-ID: <001201c8fa2c$cc8cbe60$2e01a8c0(AT)CIR2>
Content-Type: text/plain; charset="us-ascii"
Hi folks:
Your assistance is requested to help make my demo at the Santa Barbara
Amateur Radio Club's hamfest on Sunday a success. I will be providing demos
during the 10 Aug, 15:55 AO-51 pass and the 10 Aug 21:06 AO-27 pass. We'd
certainly appreciate some contacts.
Thanks!
Ken Owen, N6KTH
AMSAT Area Coordinator
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 3, Issue 400
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