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CX2SA > SATDIG 02.04.10 17:49l 1061 Lines 34140 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Arrow and EME? (Idle-Tyme)
2. AA5UK/KH6 Update >>> Where is everybody? (Adrian Engele)
3. Re: AA5UK/KH6 Update >>> Where is everybody? (davekn4ok@xxx.xxxx
4. Re: Arrow and EME? (tosca005@xxx.xxxx
5. Re: Arrow and EME? (i8cvs)
6. Hudson Valley Satcom Group Net Tonight 8PM EST ON N2EYH-L
(Cotejaune2@xxx.xxxx
7. Re: FM on VO-52 (Prathap Kumar)
8. Re: New APRS Rocket Antenna concept needed (Gordon JC Pearce)
9. Re: New APRS Rocket Antenna concept needed (Idle-Tyme)
10. Re: Arrow and EME? (Oscar Diez)
11. Re: Arrow and EME? (MM)
12. XE2BSS @ DM30 update - 2 April (Patrick STODDARD)
13. Re: Arrow and EME? (Gabriel - EA6VQ)
14. FS Complete satellite station. (Dave Aitch)
15. Re: Delfi-C3 Close approach warning (wouter weggelaar)
----------------------------------------------------------------------
Message: 1
Date: Thu, 01 Apr 2010 14:31:31 -0500
From: Idle-Tyme <nss@xxx.xxx>
Subject: [amsat-bb] Re: Arrow and EME?
To: Mark Lunday <mlunday@xx.xx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <4BB4F493.2090006@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
the best was neither vert or horizontal, and continously changing, well
slowly changing faraday rotation. plus why would you want to aste n
extra 3 db if you have it to be used?
Joe WB9SBD
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/1/2010 2:27 PM, Mark Lunday wrote:
> Would this also be accomplished in "poor man's design" by simply having one
> yagi vertical and one horizontal?
>
>
> Mark Lunday
> WD4ELG
> Greensboro, NC - FM06be
> wd4elg@xxxx.xxx
> http://wd4elg.net
> http://wd4elg.blogspot.com
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Idle-Tyme
> Sent: Thursday, April 01, 2010 1:53 PM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Arrow and EME?
>
> Another very important thing is polarity.
> the ability to change polarity can easily me a completed QSO or one
> where not a peep was heard.
>
> In the late 80's early 90's I had a small station of 4 eight element 2
> meter yagis. I think they were a W1JR design?
>
> anyway I mounted them in a way that i could rotate them in polarity also.
>
> It was amazing I never thought i could do moonbounce with them but just
> for kicks was listening down at the bottom of the band one day and heard
> someone CQing and wortking someone off he moon. of course it was W5UN.
> but a random call when he finished and we had a complete QSO in the log
> with no repeats solid exchange both ways!
>
> what make this amazing was I was using a kenwood TS700 rig into a old
> KLM (remember KLM amps?) a 70 watt one that was tired and only putting
> out about 35 watts, into a run of rg 213 50 feet to the antenna, no pre
> amps at all. and on CW by ear! no filters either just the standard 2.XX
> whatever wide filter.
> But the polarity made all the difference! In horizontal mode i heard
> NOTHING. but somewhere inbetween H and V he wa solid copy and he had no
> problem hearing me too.
>
> I eventually went on to work about 30 other stations as small as other 4
> yagi stations. The ability to make polarity changes is a GIANT advantage!
>
> Joe WB9SBD
>
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
>
> On 4/1/2010 12:11 PM, Mark Lunday wrote:
>
>> I have been doing some reading on this also. Although I have not yet made
>> any EME contacts, I have been uncovered the following:
>>
>> 1. Moonrise/moonset will enhance signals because of ground reflections,
>> something like 6 dB. Many folks intentionally use moonrise and moonset
>> attempts for this reason.
>>
>> 2. Mast mounted pre-amp is essential
>>
>> 3. Higher frequencies need more gain (so I have been told). But the 440
>>
> MHz
>
>> part of the arrow antenna should have a LOT more gain than the 2 meter
>>
> part.
>
>> 4. Low loss coax is very important, esp at VHF. Keep the runs short and
>>
> use
>
>> something equiv to LMR 400 (50 foot of the good stuff is probably under
>> $100, and worth it.
>>
>> 5. Definitely try to set up a sked with W5UN. If you can hear him, then
>>
> you
>
>> are halfway there!
>>
>> 6. Monitor websites like http://www.chris.org/cgi-bin/jt65emeA
>>
>> 7. 2010 appears to be a promising year for EME, here is a good calendar:
>> http://www.vhfdx.net/w5luu.html
>>
>>
>> Mark Lunday
>> WD4ELG
>> Greensboro, NC - FM06be
>> wd4elg@xxxx.xxx
>> http://wd4elg.net
>> http://wd4elg.blogspot.com
>>
>>
>>
>> -----Original Message-----
>> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>> Behalf Of MM
>> Sent: Thursday, April 01, 2010 8:37 AM
>> To: AMSAT-BB@xxxxx.xxx
>> Subject: [amsat-bb] Arrow and EME?
>>
>> Arrow Antenna and EME:
>>
>> It is possible to work Earth Moon Earth with an Arrow Antenna.
>>
>> Of course, it is. You just need to make a schedule with someone on the
>> other side of the link with enough Antenna Gain. You also need to be
>> running the new digital text messaging mode called JT65B
>>
>> Link for JT65
>> http://www.physics.princeton.edu/pulsar/K1JT/
>>
>> Definitions:
>> In this document I will refer to all antenna gain values based on the
>>
> number
>
>> of elements.
>>
>> Example: A Single half-wave Dipole = 0 dBd
>> Elements 2 = 3 dBd
>> Elements 4 = 6 dBd
>> Elements 8 = 9 dBd
>> Elements 16 = 12 dBd
>>
>> The Arrow antenna (Model 146/436-10) has 3 elements on the 2-meter band,
>>
> so
>
>> its maximum theoretical "Element Gain" is 4.5 dBd.
>>
>> With the invention of the JT65 protocols, thousands of Amateur Radio
>> stations running a Single Yagi 2-meter antennas, now have access to the
>>
> Moon
>
>> and EME contacts.
>>
>> To make a contact on Moon bounce, the "Total Antenna Gain" from both
>> stations is added up and will need to be in the approximate range of
>>
> 25-30
>
>> dBd. With this gain and the average transmitter power of (100-400 watts)
>> you will have a 10-20+ percent chance of completing a 2-way EME JT65B
>>
> link,
>
>> with another station.
>> Note: There are many other factures used in EME gain calculations. For
>> simplicity, we will just focus on the antenna Gain.
>>
>> The amount of Total Antenna Gain required depends on the mode you wish to
>> use. The wider the mode, the more gain that is required. The mode JT65B
>>
> is
>
>> a very narrow mode and requires less gain. I am not going to go over all
>>
> of
>
>> the details of JT65 in this article, look it up.
>>
>> Gain required by mode: (All values are approximate)
>>
>> JT65 28-30 dBd (1-Yagi + 4-Yagi)
>> CW 30-40 dBd (4-Yagi + 4-Yagi)
>> SSB 40-50 dBd (8-Yagi + 8-Yagi)
>> FM 60-70 dBd (16 + 24) Guess
>>
>>
>> The Mode JT65B requires approximately 30 dB of Total Antenna Gain for an
>>
> EME
>
>> contact.
>> If we assume the average 12-element 2-Meter Yagi has 10.5 dBd (round to 11
>> for easy math) of "Element Gain", then the more Yagi's you stack, the
>>
> more
>
>> gain you will have. In EME lingo, 1x12 means, you have One Yagi, with 12
>> elements, 4x12 means you have a stack of 4 yagis with 12 elements each
>>
> (48
>
>> elements total) and an approximate gain of 17 dBd.
>>
>> 1-Yagi = 11 dBd
>> 2-Yagi = 14 dBd
>> 4-Yagi = 17 dBd
>> 8-Yagi = 20 dBd
>> 16-Yagi = 23 dBd
>> 32-Yagi = 26 dBd
>> 64-Yagi = 29 dBd (W5UN)
>>
>>
>> A Single-Yagi station (11 dBd) calling a 4-Yagi (17 dBd) station will
>>
> have
>
>> approximately 28 dBd Total Antenna Gain. The 4xYagi stations are very
>> common on JT56B EME.
>>
>> Let's go back to the Arrow Antenna:
>>
>> We need 30 dBd of total antenna gain.
>> The Arrow antenna has 4.5 dBd.
>> The Arrow also has a Maximum power limitation of 150 watts (10 watts if
>>
> hand
>
>> held).
>>
>> If you are running the maximum 150 watts on your Arrow antenna, you
>>
> should
>
>> be able to work stations with 32 to 64 Yagi's. There are not very many 64
>> Yagi stations out there, however Dave W5UN has been active on JT65 EME
>> recently.
>>
>> If you want more of a challenge, you can try QRP at 5 watts and your Arrow
>> antenna.
>> Reducing you power from 150 watts to 5-10 watts, will reduce your
>> performance by 12 db.
>> To compensate for the reduce power, you will just need to find a station
>> with a bigger antenna.
>>
>> There is another big gun on EME. Two weeks ago, Arecibo was on EME,
>>
> running
>
>> CW, working EME stations on the 440 band. The antenna used at Arecibo is
>>
> a
>
>> simple 1,000 foot dish. The actual gain for 2-meters is not known,
>>
> however
>
>> I will assume it is more than 64-Yagi's.
>>
>> http://www.naic.edu/
>>
>> So here is your chance. Make a schedule with Arecibo and go for QRP, EME,
>> with a held Arrow antenna, or if you know of any good contacts at Arecibo,
>> send me the data and I'll try to arrange a schedule and try it from my
>> station.
>>
>> Other Hardware:
>> A good Receiver Preamp (similar to ARR)
>> http://www.advancedreceiver.com/
>>
>> A good SSB 2-meter Transceiver (the best ever made Yaesu FT-736R)
>> http://www.xs4all.nl/~ketel/ham/ft736.htm
>>
>> Good Coax (RG-8 coax is 11 Millimeter coax. That is ok for 50' EME runs,
>> for longer runs use 12+ Millimeter coax)
>>
>> 73
>>
>> WF1F
>> www.marexmg.org
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> 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: 2
Date: Thu, 1 Apr 2010 13:03:38 -0700 (PDT)
From: Adrian Engele <aa5uk@xxxxx.xxx>
Subject: [amsat-bb] AA5UK/KH6 Update >>> Where is everybody?
To: AMSAT-BB@xxxxx.xxx
Message-ID: <304510.37765.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Folks,
I know we have had some atmospheric issues that have made recent passes
difficult at best. I am still trying to help a few of you on some low angle
passes to get KH6 into your logs.
Having said that I am seeing very little activity on the SSB satellites.
Last night I again worked several satellites and all I heard was my own
voice calling CQ during every pass. Today I worked three passes FO29, VU52
and HO28. I only had one CONUS operator and one KH6 contact on HO28. Very
disappointing.
So either there is little interest in KH6 or there are timing issues. I am
not sure why there is so little participation.
I will look at the coming passes until April 4th which will most likely be
the last day I operate from Kauai. If I don't start hearing more operators I
will shut down early and work on enjoying my vacation.
Again sorry for another rant session but the lack of activity frankly
puzzles after all the emails and sked requests that I have received over the
last 6 weeks. Those operators that have worked me will be the few to get a
KH6 card once the log is checked and I go to the printers.
Remember "If it was easy, we would all be doing it", under the conditions I
have been working under: wind, rain and heavy QRN it has been very
challenging these past few days.
Aloha from AA5UK/KH6
------------------------------
Message: 3
Date: Thu, 01 Apr 2010 16:51:59 -0400
From: davekn4ok@xxx.xxx
Subject: [amsat-bb] Re: AA5UK/KH6 Update >>> Where is everybody?
To: aa5uk@xxxxx.xxxx AMSAT-BB@xxxxx.xxx
Message-ID: <8CC9FF44EDAD423-AC0-1A11@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Adrian,
I would love to work you. Our windows are very short and not very often.
Let me know the birds and I will check the window and email you back right a
way.
Thanks,
Dave, kn4ok
-----Original Message-----
From: Adrian Engele <aa5uk@xxxxx.xxx>
To: AMSAT-BB@xxxxx.xxx
Sent: Thu, Apr 1, 2010 3:03 pm
Subject: [amsat-bb] AA5UK/KH6 Update >>> Where is everybody?
Folks,
I know we have had some atmospheric issues that have made recent passes
ifficult at best. I am still trying to help a few of you on some low angle
asses to get KH6 into your logs.
Having said that I am seeing very little activity on the SSB satellites. Last
ight I again worked several satellites and all I heard was my own voice
calling
Q during every pass. Today I worked three passes FO29, VU52 and HO28. I only
ad one CONUS operator and one KH6 contact on HO28. Very disappointing.
So either there is little interest in KH6 or there are timing issues. I am not
ure why there is so little participation.
will look at the coming passes until April 4th which will most likely be the
ast day I operate from Kauai. If I don't start hearing more operators I will
hut down early and work on enjoying my vacation.
Again sorry for another rant session but the lack of activity frankly puzzles
fter all the emails and sked requests that I have received over the last 6
eeks. Those operators that have worked me will be the few to get a KH6 card
nce the log is checked and I go to the printers.
Remember "If it was easy, we would all be doing it", under the conditions I
have
een working under: wind, rain and heavy QRN it has been very challenging these
ast few days.
Aloha from AA5UK/KH6
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: 01 Apr 2010 16:11:59 -0500
From: tosca005@xxx.xxx
Subject: [amsat-bb] Re: Arrow and EME?
To: Idle-Tyme <nss@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <Gophermail.2.0.1004011611590.17123@xxxx.xx.xxx.xxx>
Content-Type: text/plain; format=flowed; charset=UTF-8
On Apr 1 2010, Idle-Tyme wrote:
>the best was neither vert or horizontal, and continously changing, well
>slowly changing faraday rotation. plus why would you want to aste n
>extra 3 db if you have it to be used?
>
>Joe WB9SBD
>On 4/1/2010 2:27 PM, Mark Lunday wrote:
>> Would this also be accomplished in "poor man's design" by simply having
>> one yagi vertical and one horizontal?
>>
>> Mark Lunday
>> WD4ELG
Sure, with an Arrow or similar antenna, you simply twist the beast until
the signal is the loudest, and you have your best polarity. On a fixed
station, getting continuously-adjustable polarization is not a trivial
task.
With one yagi vertical, one yagi horizontal, and appropriate phasing
harnesses, one could accomplish a variety of specific polarizations. The
number of different polarizations would be a function of the complexity of
the phasing harnesses. If you use no phasing harness at all (or two random
but equal lengths of harness) you can still select a phase by moving one
antenna a fraction of a wavelength forward or backward relative to the
other. But at best, if you had one vertical and one horizontal yagi, with
equal cable lengths to the impedance transformer, and the driven elements
lined up with one another, you would only end up with the equivalent of a
single yagi oriented diagonally, so no big improvement. You would always be
-3 dB from any signal that was polarized either vertically or horizontally,
but could still be way down (-20 dB or more) from a signal that started out
in one of those polarizations but got rotated by the Faraday effect.
With two crossed yagis, and two phasing lines, you could set up either
right or left-hand circular polarization. With two crossed yagis, three
phasing lines, and a SPDT coaxial relay, you could have switchable
left-hand/right-hand circular polarization.
Another step up (in both complexity and in the number and quality of
phasing choices) would be one yagi at upper left to lower right diagonal,
and one yagi at upper right to lower left diagonal, four SPDT coaxial
relays, and 4 specific lengths of phasing harness. This would give the
following four choices of polarity, depending on the choice of one of two
phasing lengths to one of the diagonals and one of two phasing lengths to
the other of the two diagonals:
Diagonal One Diagonal Two Net Phase Net Polarity
1/4 WL 1/4 WL 0 horizontal
1/4 WL 3/4 WL 180 vertical
1/2 WL 1/4 WL -90 right circular
1/2 WL 3/4 WL +90 left circular
Note that at a net phasing of 0 and 180 degrees, the polarization is
halfway between the two yagis, so if the yagis are oriented diagonally,
that gives you horizontal or vertical choices with that degree of phasing.
This, of course, does not give continuously-adjustable angular
polarization, only a choice of 4 specific polarities. But it is a nice
choice of 4: horizontal for terrestrial SSB/CW, vertical for terrestrial
FM, PLUS both right circular and left circular for satellites and EME.
If the other station is running circular polarization, in theory, ANY
linear polarization will be -3dB from optimal, and there is no advantage to
any in-between adjustability.
If the other station is running linear polarization, in theory, any random
linear polarization on your end will be anywhere from 0dB (perfect) to
worse than -20dB (horrible) depending on the amount of polarity mis-match;
and because of Faraday rotation, his horizontal signal (for example) may
not reflect back to you as horizontal, but rather somewhere else (probably
NOT vertical either!).
If both stations run circular polarization, and at least one of them is
switchable between right and left-hand circular, then you can always have
an ideal polarization match no matter what the degree of Faraday rotation.
So, that might be the best option if you have it available to you. Remember
that if you expect to hear your own echoes, the reflection from the moon is
the opposite circularity from what you transmit...
Of course, if you were trying to out-gun W5UN and build an array of 128
circularly-polarized yagis, that's a helluva lot more work than building
128 linearly-polarized yagis! OTOH, building 128 of ANY sort of antenna is
an enormous undertaking, so there! :)
W0JT
------------------------------
Message: 5
Date: Fri, 2 Apr 2010 00:20:10 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Arrow and EME?
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>, "Edward Cole"
<kl7uw@xxxxxxxxx.xxx>
Message-ID: <003401cad1e9$7e294720$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Edward Cole" <kl7uw@xxxxxxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Sent: Thursday, April 01, 2010 6:46 PM
Subject: [amsat-bb] Re: Arrow and EME?
>
> The rest of this pertains to 2-meter eme. 432-eme will take more
> antenna gain since the path-loss is higher at increase
> frequencies. This means antenna gain requirements go up
> (approximately 6-dB more for stations working eme on 432). The norm
> for two CW EME stations is 18-dBi with 1000w on 2-meters and 24-dBi
> with 1000w on 432. (subtract 1.64 dB to convert antenna gain to dBd).
>
> 73, Ed - KL7UW, WD2XSH/45
Hi Ed, KL7UW
I agree completely with you except (subtract 1.64 dB to convert antenna
gain to dBd).
The gain of a 1/2 wave dipole is 2.14 dBi = 1.64 time in power so that
to convert the antenna gain in dBd you must subtract 2.14 dB to the
antenna gain expressed in dBi
An antenna gain of 12.14 dBi is equivalent to an antenna gain of 10 dBd
Best 73" de
i8CVS Domenico
------------------------------
Message: 6
Date: Thu, 1 Apr 2010 19:42:17 EDT
From: Cotejaune2@xxx.xxx
Subject: [amsat-bb] Hudson Valley Satcom Group Net Tonight 8PM EST ON
N2EYH-L
To: amsat-bb@xxxxx.xxx
Message-ID: <92c8.770c29d9.38e68959@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Sorry for the late notice again. It was posted earlier in the week. Please
join us for the net.
73Gary
WA2AQH
------------------------------
Message: 7
Date: Fri, 2 Apr 2010 09:12:00 +0530
From: "Prathap Kumar" <vu2pop@xxxxx.xxx>
Subject: [amsat-bb] Re: FM on VO-52
To: H?kan H <sm7wsj@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <0FEF6AFEFDF04F0792D18F1595B7555D@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi
I have worked many Russians on CW and SSB on the VO-52
stations like RX9AT, UA9UKO, UA8MLT, UA3AIC, UN7RBD, UA9UEG, UA9SAN,
UA9ULT, UN4PW, UU6JG, etc.
These stations are from Ukaraine, Kazakigstan etc, Me being located in South
India I just get about a minute or so to complete a contact, its just at the
fringe of the foot print.
Similarly had also worked 4L0G from Georgia ( Eu Russia )
I can hear many more talking in Russian but very little time to get into
their QSO.
But once your call is known they do reply, I wish to add that these Russians
follow band discipline, mode segements specially working on the Linear
transponders.
Best 73
Pop
VU2POP
----- Original Message -----
From: "H?kan H" <sm7wsj@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, April 01, 2010 10:30 PM
Subject: [amsat-bb] FM on VO-52
> Hello!
>
> It is the firsth of April but i was very surprised to hear a russian
> station
> on VO52 with downlink in FM?? is this something new or have i missed
> something?
>
> It was a callsign and clearly a call via satellite. downlink on
> 145.925mhz.
>
> 73 Hakan SM7WSJ
>
> _______________________________________________
> 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: Fri, 02 Apr 2010 07:28:11 +0100
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: New APRS Rocket Antenna concept needed
To: amsat-bb@xxxxx.xxx
Message-ID: <1270189691.19145.5.camel@xxxxx.xxxx>
Content-Type: text/plain; charset="UTF-8"
On Tue, 2010-03-30 at 19:04 -0400, Robert Bruninga wrote:
> I need someone interested in adding quadrature 2 meter antennas
> to the outside of a 10" diameter sounding rocket by middle
> May...
There was an article in a recent copy of Practical Wireless about making
a DDRR antenna for 2m out of the ring around the top of a catering-size
coffee can. It's not quadrature as such, but I wonder if you could fit
such a thing inside the body of the rocket looking down, with its ground
plane acting as the bulkhead for the nose cone?
Gordon MM0YEQ
------------------------------
Message: 9
Date: Fri, 02 Apr 2010 02:11:02 -0500
From: Idle-Tyme <nss@xxx.xxx>
Subject: [amsat-bb] Re: New APRS Rocket Antenna concept needed
To: amsat-bb@xxxxx.xxx
Message-ID: <4BB59886.5070805@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Bob,
how about an Alford Slot antenna?
http://www.k5rmg.org/Alford-slot.html
one for 2 meters is almost perfect in size for a 10" diameter tube!
Joe WB9SBD
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/2/2010 1:28 AM, Gordon JC Pearce wrote:
> On Tue, 2010-03-30 at 19:04 -0400, Robert Bruninga wrote:
>
>> I need someone interested in adding quadrature 2 meter antennas
>> to the outside of a 10" diameter sounding rocket by middle
>> May...
>>
> There was an article in a recent copy of Practical Wireless about making
> a DDRR antenna for 2m out of the ring around the top of a catering-size
> coffee can. It's not quadrature as such, but I wonder if you could fit
> such a thing inside the body of the rocket looking down, with its ground
> plane acting as the bulkhead for the nose cone?
>
> Gordon MM0YEQ
>
> _______________________________________________
> 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: 10
Date: Fri, 2 Apr 2010 10:43:37 +0200
From: "Oscar Diez" <hbottiki@xxx.xx>
Subject: [amsat-bb] Re: Arrow and EME?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <002701cad240$96a29de0$1702a8c0@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi folks,
I think it should be possible to work at least the three big guns out there:
W5UN, KB8RQ and RN6BN. With their huge antenna arrays they can hear very low
power EME stations. 100-150W into the arrow should work theoretically with
those three stations if moon condx are favourable.
The best thing is to hang around in the JT65 EME chat under this address:
http://www.chris.org/cgi-bin/jt65emeA
Usually you only need to wait there till the big guns announce a CQ call
there with their used frequency. You can then also take the advantage of
realtime communication via this website to arrange a sked in realtime with
them and they will keep their ears open for you, hi
The "QRPp EME record" so far for RN6BN by the way was working LZ1BB using a
4el. DK7ZB yagi with only 40W into antenna....thus Arrow should work also
when power over 100W is used.
I can occasionally work down to 8 yagi stations in JT65B mode using a 6el.
DK7ZB Yagi and about 130W into Antenna (160W Brick-AMP minus cable loss)
For example I worked EA6VQ on Mallorca Island with his 8x17el. M2 array with
my relatively small antenna.
I can sometimes decode down to 2 yagi high power stations on JT65B RX mode
if moon condx are good...but 2-way QSO is not possible with those small
counterparts.
Here some links from other EME QRPers:
http://www.ok2kkw.com/00000104/eme.htm
(used 4el. yagi And 100W)
http://www.dj7al.de/12906.html
(used 4el. F9FT yagi and 200W)
http://www.dj7al.de/11026.html
(same station testing only HB9CV 2el. and 200W)
And here is a nice tutorial to get started in JT65B mode EME operations:
http://www.vhfdx.net/jt65bintro.html
Best 73 de Oscar DJ0MY
------------------------------
Message: 11
Date: Fri, 2 Apr 2010 04:50:09 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
Subject: [amsat-bb] Re: Arrow and EME?
To: amsat-bb@xxxxx.xxxx Oscar Diez <hbottiki@xxx.xx>
Message-ID: <968332.27358.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi All:
I am glad you enjoyed my April 01, 2010 memo on Arrow EME.
It was written partially for Humor and for education.
Ill follow up soon with more tips on what you can do with your
existing 2 and 440 satellite systems.
Earth Moon Earth is within our Reach with JT65B.
73 Miles WF1F
www.marexmg.org
------------------------------
Message: 12
Date: Fri, 2 Apr 2010 06:40:38 -0700 (PDT)
From: Patrick STODDARD <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] XE2BSS @ DM30 update - 2 April
To: amsat-bb@xxxxx.xxx
Message-ID: <399210.75168.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
After some equipment issues, Alex XE2BSS was able to get on a weatern
AO27 pass yesterday afternoon and work a few stations. He plans to try
AO27 and SO50 today and possibly Saturday, before returning home to
California. Alex also mentioned his location is grid DM30wr. His station
is a full-duplex-capable IC-Z1 and an Elk log periodic.
Good luck and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 13
Date: Fri, 2 Apr 2010 18:09:11 +0200
From: "Gabriel - EA6VQ" <ea6vq_ml@xxxxx.xxxx>
Subject: [amsat-bb] Re: Arrow and EME?
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <7F40DB7DF8A74DFB9EC0517742CFEC9C@xxx>
Content-Type: text/plain; charset="us-ascii"
With and Arrow antenna and 50w you should be able to work W5UN, KB8RQ, RN6BN
and might be a few more with a lot of patience and good EME conditions.
The smallests station I have worked via the Moon was using only a 5 elem
Yagi at the balcony and 50w, but with my 8x17 2M5WL usually a longer Yagi
(3WL or so) and/or 100w are required to be able to make the QSO. Very often
stations with small 4 or 5 element antennas are reporting to copy me via the
Moon, but copying them with their 50w is another matter.
If someone is interested to try EME with me someday just let me know. I'm
always looking forward to meeting new stations via the Moon.
For knowing which stations are CQing at a certain moment, apart from the
already mentioned N0UK EME chat, I could also suggest you look at the Live
CQ page http://www.livecq144.com/
73. Gabriel - EA6VQ
HTTP://www.vhfdx.info
> -----Mensaje original-----
> De: amsat-bb-bounces@xxxxx.xxx
> [mailto:amsat-bb-bounces@xxxxx.xxxx En nombre de Oscar Diez
> Enviado el: viernes, 02 de abril de 2010 10:44
> Para: amsat-bb@xxxxx.xxx
> Asunto: [amsat-bb] Re: Arrow and EME?
>
> Hi folks,
>
> I think it should be possible to work at least the three big
> guns out there:
> W5UN, KB8RQ and RN6BN. With their huge antenna arrays they
> can hear very low power EME stations. 100-150W into the arrow
> should work theoretically with those three stations if moon
> condx are favourable.
>
> The best thing is to hang around in the JT65 EME chat under
> this address:
> http://www.chris.org/cgi-bin/jt65emeA
>
> Usually you only need to wait there till the big guns
> announce a CQ call there with their used frequency. You can
> then also take the advantage of realtime communication via
> this website to arrange a sked in realtime with them and they
> will keep their ears open for you, hi
>
> The "QRPp EME record" so far for RN6BN by the way was working
> LZ1BB using a 4el. DK7ZB yagi with only 40W into
> antenna....thus Arrow should work also when power over 100W is used.
>
> I can occasionally work down to 8 yagi stations in JT65B mode
> using a 6el.
> DK7ZB Yagi and about 130W into Antenna (160W Brick-AMP minus
> cable loss)
>
> For example I worked EA6VQ on Mallorca Island with his
> 8x17el. M2 array with my relatively small antenna.
>
> I can sometimes decode down to 2 yagi high power stations on
> JT65B RX mode if moon condx are good...but 2-way QSO is not
> possible with those small counterparts.
>
> Here some links from other EME QRPers:
>
> http://www.ok2kkw.com/00000104/eme.htm
> (used 4el. yagi And 100W)
>
> http://www.dj7al.de/12906.html
> (used 4el. F9FT yagi and 200W)
>
> http://www.dj7al.de/11026.html
> (same station testing only HB9CV 2el. and 200W)
>
>
> And here is a nice tutorial to get started in JT65B mode EME
> operations:
> http://www.vhfdx.net/jt65bintro.html
>
> Best 73 de Oscar DJ0MY
>
>
>
> _______________________________________________
> 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: 14
Date: Fri, 2 Apr 2010 17:18:57 +0100
From: "Dave Aitch" <dave@xxxxx.xxx>
Subject: [amsat-bb] FS Complete satellite station.
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000a01cad280$324a08c0$96de1a40$@xxx>
Content-Type: text/plain; charset="us-ascii"
I will be un-subscribing from this list on the 4th April.
Any further replies regarding the items I have for sale should
got to daveocn@xxxxxxxxxx.xxx please.
Cheers, Dave. G1OCN.
AMSAT UK 5766
------------------------------
Message: 15
Date: Fri, 2 Apr 2010 18:33:43 +0200
From: wouter weggelaar <pa3weg@xxxxx.xxx>
Subject: [amsat-bb] Re: Delfi-C3 Close approach warning
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<p2w7abd0e261004020933x3360d4a3sfddb1ccb3a24e1d8@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi All,
Delfi-C3 and the COSMOS debris missed each other by more than 700
meters, so no harm was done as far as we know. Delfi-C3 still performs
nominal and is approaching its second birthday! Thank you for sending
in your telemetry and posting the status on http://oscar.dcarr.org/ !
On behalf of the Delfi-C3 team,
Wouter Weggelaar
PA3WEG
Delfi-C3 Mission Operations
On Tue, Mar 30, 2010 at 9:59 AM, wouter weggelaar <pa3weg@xxxxx.xxx> wrote:
> Hi All,
>
> While Delfi-C3 is rapidly approaching her second birthday on 28th of
> April, the team got a warning from The United States Joint Space
> Operations Center about a close approach of COSMOS debris and
> Delfi-C3.
> Today at 14:49 UTC the two objects will approach each other almost
> heads on with a difference velocity of 15km/s (yes, kilometers a
> second!). Fortunately, the predicted distance between the objects will
> be 492m, so they will miss each other.
> Although these close approach warnings were given to other satellites
> as well, and the chance that something really happens is very small,
> we would like to encourage people to listen for Delfi-C3 and send in
> telemetry.
> Please have a look at the mission operations page at
>
http://www.delfic3.nl/index.php?option=com_content&task=view&id=93&Itemid=122
> for frequency info and the latest RASCAL downoad.
>
> **PLEASE NOTE** Due to Delfi-C3s habit of sometimes switching off from
> science mode, you might hear nothing while Delfi-C3 is fine. Don't
> panic! but please do listen the orbits after and post your findings on
> http://oscar.dcarr.org
>
> Thanks on behalf of the Delfi-C3 team,
>
> Wouter Weggelaar
> PA3WEG
> Delfi-C3 Mission Operations
>
------------------------------
_______________________________________________
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 5, Issue 147
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