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CX2SA > SATDIG 21.05.08 02:33l 670 Lines 21328 Bytes #999 (0) @ WW
BID : 4594_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 254
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<CX2SA
Sent: 080521/0037Z @:CX2SA.LAV.URY.SA #:4594 [Minas] FBB7.00e $:4594_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: 145 MHz IF on V/s? (Luc Leblanc)
2. Delfi DO-64 (G0MRF(AT)aol.com)
3. Status on AO-16? (Mike Ryan)
4. Re: Status on AO-16? (Mark L. Hammond)
5. Re: AOP-1 Circular Polarization? (i8cvs)
6. Re: AOP-1 Circular Polarization? (Greg D.)
7. Re: GHz receivers and Mars (Bob Martinson)
8. L band helix radome (w7lrd(AT)comcast.net)
9. Re: AAUSAT-11 (Mineo Wakita)
10. SEEDS in FM packet mode (Mike Rupprecht)
11. want to buy Bird slugs (Joe W2KJ)
12. Re: Amateur Radio Packet Stations near Raleigh, NC (Dante Buckley)
13. re seeds (Angus)
----------------------------------------------------------------------
Message: 1
Date: Mon, 19 May 2008 10:34:24 -0400
From: Luc Leblanc <lucleblanc6(AT)videotron.ca>
Subject: [amsat-bb] Re: 145 MHz IF on V/s?
To: amsat-bb(AT)AMSAT.Org
Message-ID: <483157B0.5004.3D6AA8(AT)lucleblanc6.videotron.ca>
Content-Type: text/plain; charset=US-ASCII
On 18 May 2008 at 17:56, K & R Yoksh wrote:
>
> Hi all,
>
> Thanks for the replies, however, I've still not had my question answered, so
> I'll ask again.
>
> I'd like to hear from anyone using a 145 MHz IF when working mode V/s. Do
> you experience
> desense when operating V/s, but not other uplink modes?
>
> I'm planning to use my AIDC 3731 with 145 MHz IF when I install my dish this
> summer. I really want to use it for HEO operation, but it'd be a bonus if I
> could also work the LEOs.
>
> I could go with a 123 MHz IF unit if that'd work better.
>
I am using this configuration since AO-40 era i cannot remember when i was
using an 145 IF if i was getting some desense but i think not as
i was using to individual radio. The main reason why i keep the 123 IF is due
to the Yeasu FT-847 who cannot transmit at 123MHZ. This save
my AIDC downconverter from any accidental TX in it.
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 2
Date: Mon, 19 May 2008 17:38:30 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] Delfi DO-64
To: amsat-bb(AT)amsat.org
Message-ID: <d03.33f392b9.35634d56(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Excellent signals from Delfi C3 ( DO-64 ) on this evenings 21.23UTC pass
here in London.
No drop outs or distortion. 214 decoded packets from an IC706 with a 3 ele
beam pointing at a single point in the sky without a rotator.
Very nice
David
------------------------------
Message: 3
Date: Mon, 19 May 2008 18:35:18 -0400
From: "Mike Ryan" <mryan301(AT)comcast.net>
Subject: [amsat-bb] Status on AO-16?
To: <amsat-bb(AT)amsat.org>
Message-ID: <000c01c8ba00$a04ebc20$0201a8c0(AT)your6jnhhu0520>
Content-Type: text/plain; charset="iso-8859-1"
Can anyone tell me the status of AO-16? I recall a message here that it was
having problems, but no updates or new lately that I can find. I heard nothing
on the passes I've tried over the last few days.
Mike WB1AAT
------------------------------
Message: 4
Date: Mon, 19 May 2008 21:42:32 -0400
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Subject: [amsat-bb] Re: Status on AO-16?
To: amsat-bb(AT)amsat.org, wb1aat(AT)amsat.org
Message-ID: <A0.86.18846.78C22384(AT)smtp09.embarq.synacor.com>
Content-Type: text/plain; charset="us-ascii"
Hi Mike,
Indeed, over the last several days you are likely to have found AO-16 silent.
There appears to be something in the spacecraft shutting down the transmitter
after a short, random period of time. Current speculation on the problem
includes a temperature issue that has reared its ugly head now that the
eclipse periods are increasing and the spacecraft internal temperatures are
decreasing. It may be a hardware timer. It does not appear to be a battery
issue.
At this point, the best we can do is to manually turn the satellite ON and
then configure it for voice operations. This is a manual process and command
stations are limited to the East coast of the US. As our busy schedules
permit, we'll try to turn it ON; for now, it's the best we can do. Only time
will tell if the current situation will stay the same, improve, or get worse.
73,
Mark Hammond, N8MH
AO-16 Command Station
>Can anyone tell me the status of AO-16? I recall a message here that it was
>having problems, but no updates or new lately that I can find. I heard
nothing
>on the passes I've tried over the last few days.
>
>Mike WB1AAT
Mark L. Hammond [N8MH]
------------------------------
Message: 5
Date: Tue, 20 May 2008 03:29:27 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: AOP-1 Circular Polarization?
To: "Sebastian" <w4as(AT)bellsouth.net>, "AMSAT-BB" <amsat-bb(AT)AMSAT.Org>
Message-ID: <002b01c8ba18$f25cab40$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Sebastian" <w4as(AT)bellsouth.net>
To: "AMSAT-BB" <amsat-bb(AT)AMSAT.Org>
Sent: Monday, May 19, 2008 4:15 PM
Subject: [amsat-bb] Re: AOP-1 Circular Polarization?
> Thanks for everyone's replies. It looks like the consensus is to
> mount the beams in the terrestrial + pattern (vertical/horizontal).
> I'll be mounting the antennas on a fiberglass pole that served me well
> years ago (it's been keep safe inside the attic). This is good,
> because that way I should be able to use those antennas for local
> repeater work with minimal loss if any, due to using both polarities
> at the same time.
>
Hi Sebastian, W4AS
If you mount the beams in the terrestrial + pattern (vertical /horizontal)
on a fiberglass pole it is good but to get both polarities at the same time
with minimal loss if any is impossible.
Your old Cushcraft AOP-1 satellite antennas consists of a 144-20T
crossed yagi for 2 meters and a 416TB crossed yagi for 70 cm and both
antennas are mounted with their own elements into the same physical plane
(or about)
According to the manual of the 144-20T if you use the phasing harness
supplied with the antennas you will get the RHCP or the LHCP and when
the delay line is not connected you will get the so called "Axial
Radiation" that apparently looking at the manual seems to generate the
linear Vertical and Horizontal polarizations both at the same time but
this is a misinterpretation.
If you plan to connect the antennas as the manual suggest for the "Axial
Radiation" with the purpose to use both V and H polarizations at the same
time this is not a good idea and I will demonstrate that if you feed both
antennas in phase in to a + configuration as suggested by the manual
you will loose 3 dB over the real Vertical or 3 dB over the real Horizontal
polarization.
In the Axial Radiation the Vertical and Horizontal fields generated by the
dipoles are only the components of the field but the resultant of the field
is oriented at 45 degrees or at 135 degrees depending on how you have
connected the feed lines to the dipoles.
If we assume that the voltage components over the V and H dipoles are both
1 volt than the voltage of the resultant vector oriented at 45 degrees is
the diagonal of a square or 1.41 volt so that over the same radiation
resistance the power contained over the resultant vector oriented at 45
degrees is 2 time greater or 3 dB greater than the power radiated by the
vertical and by the horizontal dipoles at the same time.
It follows that if you plan to use those antennas for local repeater without
to loose 3 dB you must feed only the Vertical antenna and if you plan to use
the horizontal antenna for tropo without to loose 3 dB you must feed
only the Horizontal antenna.
In addition if you run to the shak two coax lines having the same lenght
and the same type of coax cable you can add a 1/4 wave delay line and
get with easy the V-H-RHCP and LHCP polarizations as the manual
suggests
By the way if you mount those antennas in a X configuration over a
fiberglass boom it is equally good but in this case the elements oriented
at 45 degrees and the elements oriented at 135 degrees when supplied
at the same time becames the components of the field and the resultant
will be a field horizontally or vertically polarized depending on how
you have connected the feed lines to the dipoles.
Again running two feed lines of equal lenght into the shak and using a
delay line 1/4 wave electrically long you can switch with easy between
RHCP and LHCP but to switch between linear V and H polarizations
is possible but it is more complicated.
73" de
i8CVS Domenico
> On May 19, 2008, at 4:44 AM, i8cvs wrote:
>
> > ----- Original Message -----
> > From: "Greg D." <ko6th_greg(AT)hotmail.com>
> > To: "Ronald G. Parsons" <w5rkn(AT)amsat.org>; <amsat-bb(AT)amsat.org>
> > Sent: Monday, May 19, 2008 9:17 AM
> > Subject: [amsat-bb] Re: AOP-1 Circular Polarization?
> >>
> >> Actually, I was thinking about this today... There was an earlier
> >> thread
> >> which discussed the off-angle performance of a crossed Yagi, and if I
> >> recall, the pattern becomes elliptical as you move off the
> >> antenna's bore
> >> sight. If this is true, then I conclude that it would be better
> >> to mount
> >> a crossed Yagi in the + orientation, vs X, as that way one of the two
> >> antennas will be properly aligned for an off-angle linear station.
> >> For
> >> satellite work, with accurate keps, this is probably not a
> >> significant
> >> issue, but for terrestrial work and other situations where the
> >> target's
> >> position may not be known or tracked, + should be more forgiving
> >> than X.
> >> At least, that's my theory.
> >>
> >> I kind of hope I'm wrong on this... I just got a new 70cm antenna
> >> from a
> >> swap meet today, and it's already mounted in the X position.
> >>
> >> Greg KO6TH
> >>
> >>
> > Hi Greg, KO6TH
> >
> > The interferometer-like effect that you mentioned is referred only
> > to a dual
> > boom antenna mounted configuration no matter if the antennas are
> > mounted
> > in a X or + configuration.
> >
> > The distance between the two antennas make the phase of the received /
> > transmitted signals to be different when the antennas are moved bore
> > sight
> > from the satellite.
> >
> > Depending on the squint angle between the off-boom antennas and the
> > satellite the above phase difference can make a RHCP signal to
> > appear LHCP
> > or elliptical or linear.
> >
> > If both antennas are mounted instead over a single concentric boom
> > this
> > interferometer-like effect cancel out no matter if the antennas are
> > in a X
> > or + configuration.
> >
> > This effect has been described into "The Satellite Experimenter's
> > Handbook"
> > by Martin Davidoff , K2UBC 2nd Edition pages 7-12 and 7-13
> >
> > By the way the X configuration is the best if you use a metal-boom
> > while
> > the X or + configuration can be used indifferently if you use an
> > insulated
> > boom like fiberglass or wooden boom as demonstrated with experiments
> > by WA5VJB
> >
> > http://www.g6lvb.com/fibermetalboom.htm
> >
> > In addition the X configuration is nice if you want to add V and H
> > linear
> > polarizations using a relay switcher for V-H-RHCP-LHCP as described
> > into the AMSAT Journal March/April 2007 and May/June 2007
> >
> > 73" de
> >
> > i8CVS Domenico
> >
> >> ----------------------------------------
> >>> From: w5rkn(AT)amsat.org
> >>> To: amsat-bb(AT)amsat.org
> >>> Date: Sun, 18 May 2008 16:42:02 -0500
> >>> Subject: [amsat-bb] Re: AOP-1 Circular Polarization?
> >>>
> >>> Assuming the antennas you reference do produce circular
> >>> polarization,
> >>> radiation wise, it doesn't matter whether you mount them in an X
> >>> or +
> >>> orientation. The only difference would be the phase of the
> >>> radiation,
> > and
> >>> you are not concerned with that. There could also be a difference
> > between
> >>> right- or left-circular polarization, but whether that matters
> >>> depends
> > on
> >>> the polarization the the satellite's antenna. But X or + does not
> >>> change
> >>> that.
> >>>
> >>> There might be some mechanical reason for an X or +, such as weather
> >>> proofing, but not signal wise.
> >>>
> >>> Ron W5RKN
> >>>
> >>>> Date: Sun, 18 May 2008 14:28:34 -0400
> >>>> From: Sebastian
> >>>> Subject: [amsat-bb] AOP-1 Circular Polarization?
> >>>> To: Amsat - BBs
> >>>> Message-ID:
> >>>> Content-Type: text/plain; charset=US-ASCII; format=flowed;
> >>>> delsp=yes
> >>>>
> >>>> Hello all, I'm getting ready to put back up my old AOP-1 antennas
> >>>> (the
> >>>> old Cushcraft antennas that were popular in the days of AO-10 &
> >>>> 13).
> >>>> I'm wondering whether I should follow the same procedure of cross
> >>>> polarization for the 440 beam? It was recommended at the time to
> >>>> place the antenna in an X pattern instead of the cross pattern.
> >>>> Also,
> >>>> at the time, the 2 meter antenna was suggested to be placed in the
> >>>> standard vertical/horizontal polarization.
> >>>>
> >>>> Please let me know which would be the best method to use for most
> >>>> of
> >>>> today's birds.
> >>>>
> >>>> 73s de W4AS
> >>>>
> >>>>
> >
> >
> >
> >
> >
> > _______________________________________________
> > 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
>
> _______________________________________________
> 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
------------------------------
Message: 6
Date: Mon, 19 May 2008 21:48:09 -0700
From: "Greg D." <ko6th_greg(AT)hotmail.com>
Subject: [amsat-bb] Re: AOP-1 Circular Polarization?
To: i8cvs <domenico.i8cvs(AT)tin.it>, "Ronald G. Parsons"
<w5rkn(AT)amsat.org>, AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <BLU133-W121F3CA192AE4AA1958D0BA9C40(AT)phx.gbl>
Content-Type: text/plain; charset="Windows-1252"
Hi Dom,
Ah, yes, that makes sense. I am relieved...
My cross boom is a wood closet pole, so is more-or-less non-conducting. But I
thought I'd try the X orientation because it moves the elements just a little
farther away from the BBQ Grill 2.4 ghz downlink which is right adjacient on
the boom. The interaction hasn't been an issue in the past, but I only wanted
to drill the holes once.
Thanks again for all your insight. This stuff is all magic, until you
understand what is going on.
Greg KO6TH
>>
>> I kind of hope I'm wrong on this... I just got a new 70cm antenna from a
>> swap meet today, and it's already mounted in the X position.
>>
>> Greg KO6TH
>>
>>
> Hi Greg, KO6TH
>
> The interferometer-like effect that you mentioned is referred only to a dual
> boom antenna mounted configuration no matter if the antennas are mounted
> in a X or + configuration.
>
_________________________________________________________________
Give to a good cause with every e-mail. Join the i?m Initiative from
Microsoft.
http://im.live.com/Messenger/IM/Join/Default.aspx?souce=EML_WL_ GoodCause
------------------------------
Message: 7
Date: Tue, 20 May 2008 03:08:54 -0400
From: "Bob Martinson" <REMartinson(AT)rcn.com>
Subject: [amsat-bb] Re: GHz receivers and Mars
To: "D. Mynatt" <dave(AT)mynatt.biz>, <AMSAT-BB(AT)amsat.org>
Message-ID: <AHEFKIADNPMDOPNNPAPDOECNCMAA.REMartinson(AT)rcn.com>
Content-Type: text/plain; charset="us-ascii"
Freddy de Guchteneire, ON6UG , gave a most interesting demo & talk at last
month's SVHFS conference in Orlando on a related topic. He demo'ed
reception of Stereo A & B with a very small dish antenna.
73,
Bob, N1VQR
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]On
Behalf Of D. Mynatt
Sent: Sunday, May 18, 2008 9:24 PM
To: AMSAT-BB(AT)amsat.org
Subject: [amsat-bb] GHz receivers and Mars
Any one in the group been dreaming or scheming to be able to directly
receive Mars Lander telemetry?
Dave/KA0SWT
_______________________________________________
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
------------------------------
Message: 8
Date: Tue, 20 May 2008 07:28:52 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] L band helix radome
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<052020080728.4941.48327DB4000B51190000134D22155786740B9D04C999(AT)comca
st.net>
Content-Type: text/plain
Hello
Has anyone tried buinding a helix with a radome similar to the one used by
Directive Systems. I would like to do it right the first time and not
reinvent the wheel.
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 9
Date: Tue, 20 May 2008 18:36:37 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] Re: AAUSAT-11
To: amsat-bb(AT)amsat.org
Message-ID: <50C8BA5CFFF1CBei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
I translated into English from DK3WN's page for AAUSAT-II telemetry:
http://www.dk3wn.info/sat/afu/sat_aau.shtml
Please see it:
http://www.ne.jp/asahi/hamradio/je9pel/aausati2.htm
de JE9PEL, Mineo Wakita
------------------------------
Message: 10
Date: Tue, 20 May 2008 13:29:08 +0200
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
Subject: [amsat-bb] SEEDS in FM packet mode
To: "'Amsat Buleitin Board'" <amsat-bb(AT)amsat.org>
Message-ID: <002b01c8ba6c$bbcabf00$33603d00$(AT)de>
Content-Type: text/plain; charset="us-ascii"
SEEDS was in FM packet mode today (May, 20) at 1045UTC.
I decoded more than 270 packets.
2008-05-20 10:47:11.860 UTC: [95 Bytes KISS Frame (without CRC)]
1 > C0 00 94 A2 62 B2 8E AC 60 94 A2 62 B2 8E AA 61 03 F0 F9 01
21 > B2 D4 00 02 01 5B 00 00 00 01 00 01 00 01 00 00 00 00 0B A1
41 > 0B D3 0B 99 0B 9D 0B CE 0C 08 00 05 00 00 00 07 00 05 00 00
61 > 00 05 0C D7 0F FA 07 EE 07 9F 08 17 08 42 07 29 08 0C 0A 08
81 > 0A 03 0A 02 09 FF 09 FE 0A 3A 09 DE 0A 1B C0
2008-05-20 10:47:13.020 UTC: [95 Bytes KISS Frame (without CRC)]
1 > C0 00 94 A2 62 B2 8E AC 60 94 A2 62 B2 8E AA 61 03 F0 F9 01
21 > B3 10 00 02 01 60 00 00 00 01 00 01 00 01 00 00 00 00 0B A1
41 > 0B D1 0B 9D 0B AE 0B D5 0C 07 00 05 00 00 00 07 00 04 00 00
61 > 00 05 0C C6 0F F7 07 EC 07 A0 08 17 08 40 07 2C 08 0F 0A 01
81 > 0A 02 0A 06 09 FC 09 FC 0A 3B 0A 3C 0A 1C C0
2008-05-20 10:47:14.200 UTC: [95 Bytes KISS Frame (without CRC)]
1 > C0 00 94 A2 62 B2 8E AC 60 94 A2 62 B2 8E AA 61 03 F0 F9 01
21 > B3 4C 00 02 01 65 00 00 00 01 00 01 00 01 00 00 00 00 0B A1
41 > 0B D1 0B 9E 0B AA 0B D1 0C 06 00 05 00 02 00 07 00 05 00 00
61 > 00 05 0C CE 0F F7 07 EF 07 A0 08 18 08 3F 07 27 07 27 0A 03
81 > 0A 03 0A 04 09 F7 09 FC 0A 35 0A 3C 0A 18 C0
73, Mike
DK3WN
------------------------------
Message: 11
Date: Tue, 20 May 2008 13:54:36 -0400
From: "Joe W2KJ" <w2kj(AT)bellsouth.net>
Subject: [amsat-bb] want to buy Bird slugs
To: "AMSAT" <amsat-bb(AT)amsat.org>
Message-ID: <00c801c8baa2$9217a2f0$7101a8c0(AT)Y4M7M0>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Want to buy one each of the following slugs for the Bird 4410A wattmeter:
4410-3 1kw 2mhz-30mhz
4410-15 100w 1ghz-1.8ghz
Hope someone has a few spares of the above slugs.
73, Joe W2KJ
------------------------------
Message: 12
Date: Tue, 20 May 2008 14:06:09 -0400 (EDT)
From: Dante Buckley <dante35(AT)ufl.edu>
Subject: [amsat-bb] Re: Amateur Radio Packet Stations near Raleigh, NC
To: amsat-bb(AT)amsat.org
Message-ID:
<1735077710.355501211306769558.JavaMail.osg(AT)osgjas04.cns.ufl.edu>
Content-Type: text/plain; format=flowed; charset=us-ascii
Hi all,
Is there anyone who has a AX.25 packet station to assist us in
testing and evaluating a ground communications system near
Raleigh, North Carolina? The ground communications system consists
of packet radio which operates at 2 meter and 70 centimeter bands.
For the more information, please email Angels
(mandelui(AT)hotmail.com) and/or me (dante35(AT)ufl.edu) about providing
us with amateur packet radio support.
73,
Dante ~ KI4LDJ
------------------------------
Message: 13
Date: Tue, 20 May 2008 19:19:06 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] re seeds
To: <amsat-bb(AT)AMSAT.Org>
Message-ID: <60F19C27D5664F8894CC51295425517D(AT)GusPC>
Content-Type: text/plain; charset="iso-8859-1"
Hi I have swapped PCs over and managed to loose all the kelps for the seeds,
anyone email me them please?
regards
Gus M0IKB
--
I am using the free version of SPAMfighter for private users.
It has removed 79 spam emails to date.
Paying users do not have this message in their emails.
Get the free SPAMfighter here: http://www.spamfighter.com/len
------------------------------
_______________________________________________
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 254
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