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CX2SA > SATDIG 16.04.10 19:25l 945 Lines 29740 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Arecibo (i8cvs)
2. 50 ohm antenna matcher (Dave Guimont)
3. Re: AO-7 is not OK (i8cvs)
4. Arecibo and circular polarization using cheap yagis
(Douglas Quagliana)
5. Re: Most hams in space at one time?? (tosca005@xxx.xxxx
6. Arecibo, Sun & Moon (Vince Fiscus, KB7ADL)
7. Re: Arecibo and circular polarization using cheap yagis
(Edward Cole)
8. Re: Arecibo, Sun & Moon (Vince Fiscus, KB7ADL)
9. Re: usb to serial adapter woes (Larry Gerhardstein)
10. SATPC32 (Roger Swickis)
11. Re: SATPC32 (Rich Dailey (Gmail))
12. KP4AO Arecibo Video Streaming (Trevor .)
13. Arecibo (Nick Pugh K5QXJ)
14. Re: Arecibo and circular polarization using cheap yagis (i8cvs)
15. Re: Arecibo and circular polarization using cheap yagis
(Rick - WA4NVM)
16. Re: Arecibo and circular polarization using cheap yagis
(Vince Fiscus, KB7ADL)
17. Re: Arecibo (Mark L. Hammond)
18. Re: Arecibo (Steve)
----------------------------------------------------------------------
Message: 1
Date: Thu, 15 Apr 2010 21:17:51 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Arecibo
To: "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <000901cadcd0$581bb6c0$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, April 15, 2010 6:23 PM
Subject: [amsat-bb] Arecibo
>
> Hello
>
> Should I be so lucky as to connect with Arecib o this weekend, what is the
> proper protocol for a QSO?
>
> 73 Bob W7LRD
>
> Seattle
>
Hi Bob W7LRD
An effective method of reporting and confirming signal reports helps in
completing information exchanges .
The following system was currently in use on CW reports when I was on
432 MHz EME early 1977-1980 with an array of 16 x 21 element yagi
and 1 kW
T = signal detected
M = letters or portions of call copied
O = both calls and report copied
MT = nearly solid copy
5 = solid copy, no need for code
By this system as an example a series of OOO OOO OOO plus both calls
received at both ends and confirmed with RRR estabishes a contact.
I dont know is the above procedure is still in use but if you use it be sure
to be understud by the Arecibo very expert old timer EME operators.
There is a reason to use the above procedure that is avoid using code
characters requiring dots such as the letters I, E, S and H and the
numbers 2 to 7
By the way since we hope to receive Arecibo we will see what procedure
they actually will use in real life.
If available on your receiver use the CW 500 Hz filter.
Good luck and 73" de
i8CVS Domenico
------------------------------
Message: 2
Date: Thu, 15 Apr 2010 12:32:57 -0700
From: Dave Guimont <dguimon1@xxx.xx.xxx>
Subject: [amsat-bb] 50 ohm antenna matcher
To: amsat-bb@xxxxx.xxx
Message-ID: <49.1A.02744.2F967CB4@xxxxxxxxxxxxx.xxxx.xx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
There was a request on here several days ago for a 50 ohm antenna
matcher, and by the time I found the file, I accidentally deleted
the request...
An inexpensive homebrew one can be found here:
http://cid-1973adc8c1d3207c.skydrive.live.com/summary.aspx?sa=140581470
See 435QuarterWaveMatcher
Probably find the parts in your junk box.....
73, Dave, WB6LLO
dguimon1@xxx.xx.xxx
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 3
Date: Thu, 15 Apr 2010 22:01:04 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: AO-7 is not OK
To: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>, "'ps8rf Piraja'"
<ps8rf@xxxxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <000901cadcd6$61ae37c0$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Piraja and Mike
Today during revolution 62062 over Europe AO-7 was in Mode-A
and I did a nice and long QSO with SV1EEK
Signal where strong but the transponder was FM-ing like in Mode-B
and this is unusual in Mode-A
Probably a poor solar panels illumination ?
73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
To: "'ps8rf Piraja'" <ps8rf@xxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Wednesday, April 14, 2010 6:25 PM
Subject: [amsat-bb] Re: AO-7 is not OK
Hi Piraja,
Yes, I made similar observations. If the CW is active on 70cm you can hear
sometimes a very strong deviation in frequency.
The CW beacon partly not decodable. I agree with you it could be an effect
by low batteries or due heavy usage.
See some graphs here: http://www.dk3wn.info/p/?cat=21
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von ps8rf Piraja
Gesendet: Mittwoch, 14. April 2010 13:22
An: amsat-bb@xxxxx.xxx
Betreff: [amsat-bb] AO-7 is not OK
Some days we are seeing very strange behavior in the AO-7. In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts. The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is
stabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
_________________________________________________________________
Voc? sabia que seu navegador te ajuda a ficar longe de v?rus? Leia mais
sobre isso.
http://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500
_______________________________________________
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: Thu, 15 Apr 2010 15:16:26 -0500
From: Douglas Quagliana <dquagliana@xxx.xxx>
Subject: [amsat-bb] Arecibo and circular polarization using cheap
yagis
To: amsat <amsat-bb@xxxxx.xxx>
Message-ID: <4BC7741A.4030809@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I heard Arecibo would be using circular polarization, but I haven't heard
if it will be left or right-handed circular polarization.
I also heard that there's a way to do circular polarization with the popular
"cheap yagis." Apparently the details are in an article in the April 1999
issue of CQ VHF "Cheap Circular Polarization? It Can Be Done" on pages
66-69.
Is there anyone on the list that has this back issue that can tell me what
the method is that is described in this article? Is it a physical
quarter-wave
displacement on the same boom? Two booms with a quarter-wave coax delay?
Something else? How is the circular polarization done with the cheap yagis?
Douglas KA2UPW/5
------------------------------
Message: 5
Date: 15 Apr 2010 15:19:44 -0500
From: tosca005@xxx.xxx
Subject: [amsat-bb] Re: Most hams in space at one time??
To: Larry Teran <ki6yaa@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <Gophermail.2.0.1004151519440.29024@xxxx.xx.xxx.xxx>
Content-Type: text/plain; format=flowed; charset=UTF-8
Well, I'm so busy at work that I have not been able to keep up with the
news like I used to, but I seem to recall that the folks up there in space
are kept awfully busy with scheduled activities, and that if that wasn't
bad enough, they were talking about adding another EVA to fix a stuck valve
on a nitrogen tank or some such thing. So, they may simply be too busy to
play with the ham radio equipment that is up there.
IIRC, there is also something of an issue with the particular radio that is
installed up there being a little tricky to switch among the various
operating modes like cross-band FM repeater, simplex, packet, etc., and I
seem to remember some folks saying that they didn't want to mess with it
for fear of putting it into a mode that would render it unusable until
someone who was really familiar with the Kenwood's operation was either up
there or able to talk an astronaut through the re-configuration process.
Personally, I think it's too bad that one of the astronauts couldn't sneak
an FT-817 into their personal luggage allotmentm, and hook it up to the
external omnidirectional antenna, and just start calling CQ on SSB simplex,
and work the ensuing pileup. But, unfortunately, that's not gonna fly!
(Rules are there for a reason. If the FAA is afraid of a radio transmitter
disabling an airliner, imagine NASA's fear of a non-vetted 5 watt
transmitter on board a spaceship where the nearest repair facility is
unable to send anyone over to your location to fix things that break or get
confused by the RF.)
Nevertheless, thinking of the old adage, "you catch more flies with honey
than vinegar", instead of complaining to the astronauts "Why don't you
call?", we should perhaps take the approach "Hey folks, we'd LOVE to hear
from ya if you can spare a moment here or there from your busy schedule!".
73 de W0JT
On Apr 15 2010, Larry Teran wrote:
>I'm with you Ed there are a lot of new satellite operators including my
> self, that are willing to contact the ISS, I give them I try every once
> in a
>while since I get my satellite station , and no success.
>
>On Wed, Apr 14, 2010 at 12:42 PM, edward kacura <ekacura@xxxxx.xxx> wrote:
>
>> I know this sounds negative, but with all these hams in space, why isn't
>> anyone operating???
>>
>> Why can't I and all the rest of us earth bound hams contact the ISS with
>> our handhelds and Arrow antennas????
>>
>> What good is it , to have all these hams up there, and not a one, can
>> make
>> contact with us poor souls on earth???
>>
>> ???????????????????????????????????????????? 73 de Ed N7EDK ???????????
>
------------------------------
Message: 6
Date: Thu, 15 Apr 2010 15:49:48 -0600
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Subject: [amsat-bb] Arecibo, Sun & Moon
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.1.1.2.20100415154658.02789ac8@xxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I noticed the moon is fairly close to the sun in the sky. There may be
some solar noise, but I don't know how much noise the sun generates at 432.
KB7ADL
------------------------------
Message: 7
Date: Thu, 15 Apr 2010 13:49:59 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap
yagis
To: Douglas Quagliana <dquagliana@xxx.xxx>, amsat <amsat-bb@xxxxx.xxx>
Message-ID: <201004152150.o3FLo0dw096293@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 12:16 PM 4/15/2010, Douglas Quagliana wrote:
>I heard Arecibo would be using circular polarization, but I haven't heard
>if it will be left or right-handed circular polarization.
>
>I also heard that there's a way to do circular polarization with the popular
>"cheap yagis." Apparently the details are in an article in the April 1999
>issue of CQ VHF "Cheap Circular Polarization? It Can Be Done" on pages
>66-69.
>
>Is there anyone on the list that has this back issue that can tell me what
>the method is that is described in this article? Is it a physical
>quarter-wave
>displacement on the same boom? Two booms with a quarter-wave coax delay?
>Something else? How is the circular polarization done with the cheap yagis?
>
>Douglas KA2UPW/5
>
>
>_______________________________________________
>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
You are running out of time to build a CP antenna system for the
Arecibo eme event, aren't you? I would not worry about it and just
use a simple yagi in any polarity. Yes, you will lose 3-dB of the
signal from Arecibo, but it probably won't matter much if your
antenna is big enough. Arecibo will be transmitting an effective
power of 441 Mw.
But if you want to make a CP antenna from a yagi, you need two sets
of elements perpendicular to each other (i.e. two antennas mounted on
a single boom or two separate antennas one rotated 90-degrees in
polarity from the other. If both are mounted so the antennas are
in-phase you need to split the feedline and add 1/4 wavelength of
cable to one antenna. Or you can split the feedline equally if one
antenna is spaced 1/4 wavelength ahead of the other. The relation of
the fed elements determine whether you get RH or LH CP. The center
conductor is connected to one side of the fed element (this is called
the + side). If the antenna to the rear (or not with extra feedline)
is vertical with "+" straight up and the other antenna has its "+"
element pointing to the right, you get RHCP. Reverse it and you get
LHCP. For antennas in the "X" configuration (back antenna "+" up and
to the left, front antenna "=" up and to the right for RHCP.
Caveat: I f you have the antenna configured backwards for Arecibo
then you will hear nothing. Little understood fact of eme: RHCP
signals are reflected by the Moon as LHCP signals back to earth, and
vice versa. We have no info on Arecibo, but for hams the convention
is to Tx - RHCP and RX - LHCP for eme. So if you build a CP antenna
and you plan to transmit, also, you will need a polarity switching
system between Tx and Rx.
I am building a simple two-element Quagi (linear pol) to feed my dish
(24.5 dBi). VK3UM spreadsheet says Arecibo will hear me with a +20
dB signal on SSB.
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
------------------------------
Message: 8
Date: Thu, 15 Apr 2010 17:45:29 -0600
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Subject: [amsat-bb] Re: Arecibo, Sun & Moon
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.1.1.2.20100415173401.00bc7290@xxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 01:26 PM 4/15/2010 -0800, Edward Cole <kl7uw@xxxxxxxxx.xxx> wrote:
>At 01:49 PM 4/15/2010, you wrote:
>
>>I noticed the moon is fairly close to the sun in the sky. There may be
>>some solar noise, but I don't know how much noise the sun generates at 432.
>>
>>KB7ADL
>>
>>_______________________________________________
>>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
>
>Vince,
>
>The Sun is approx. 20-degrees away from the Moon (today), so it may cause
>some degradation of receiver sensitivity, depending on how narrow your
>antenna beam is. I will be using a 16-foot dish with 9.9 degree
>HPBW. Hopefully, the sun will be down -15 dB or more when I point at the
>Moon. But if you are using a 15-dBi yagi yoru beamwidth is about
>33-degrees and the sun will be seen by your system.
>
>I don't have time to research what to expect in degradation, busy working
>on getting the antenna ready ;-)
>
>
>73, Ed - KL7UW,
Your beamwidth will be a lot more narrower than mine. If I get a chance to
give it a listen I'll be using an auto-tracked eight element RHCP yagi with
a Landwehr preamp. There was an OM in the area that was an avid EME'er at
one time. He has since passed away, I asked him once when is the best time
to listen for stations doing EME, Full moon, New Moon, Quarter moon, and
he said new moon was worst because of solar noise and also when the sun is
within your beamwidth around new moon.
KB7ADL
------------------------------
Message: 9
Date: Thu, 15 Apr 2010 18:41:08 -0600
From: Larry Gerhardstein <gerhardstein@xxxxxxx.xxx>
Subject: [amsat-bb] Re: usb to serial adapter woes
To: kq6ea@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4BC7B224.4020507@xxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Jim, et. al., Thanks for the advice. However, after installing the
USA-49WG and driver install for Windows 7 with help from Tripp Lite
technical support, my system still does the same thing. I plug the
serial cables to both rotor and transceiver digital interfaces and then
to the 49WG and the same thing happens. Azimuth meter drops to zero and
there is no control. Further it is now working worse than before, as I
have neither control of rotor or transceiver. If measure the voltage
between metal shields of the two cables, there is about 2 volts there.
It sure looks like a ground loop, but where and how. I have no idea at
this point. In 56 years a ham operator, I've never run into anything
like this. Maybe RS232 isolators would fix this??? Seems like overkill.
Larry W7IN
On 4/10/2010 6:01 PM, kq6ea@xxxxxxx.xxx wrote:
> I bought one of the Keyspan 4-port boxes some years ago, and it's
> never missed a beat.
> I mostly use it on Field Day with my laptop so I can have SatPC32
> control my Ft-847, btu now that I've built both the Las Vegas Tracker
> *and* the Fox Delta unit, I'll be using it to control the radio and my
> Uaesu Az/El rotor.
> They've not inexpensive, but then you always get what you pay for!
> 73, Jim KQ6EA
>
> On Apr 10, 2010, *Larry Gerhardstein* <gerhardstein@xxxxxxx.xxx> wrote:
>
> I hope someone can shed light. I'm using SatPC32, but that does not
> affect this problem.
>
> Awhile back I was forced to recycle both of my older computers
> that had
> one built in 9-pin serial port. Then, I connected the built-in
> port to
> the GS-232B rotor interface. I also purchased some HL USB-RS232
> USB-to-Serial adapters, a cable with USB on one end and a 9 pin
> RS232 on
> the other end. I used this gadget to control my transceiver (which
> is a
> IC910H).
>
> Now I have a new computer which has no (zero) built in serial ports.
> I'm trying to use two of the USB-to-Serial gadgets and have run into
> trouble. If I disconnect all grounding back through the power, I can
> get one of the two to work, either the rotor or the rig-control,
> but not
> both at the same time. Without disconnecting grounding, neither work.
> It does not matter whether I'm plugging the USB ends directly into
> the
> computer, using a passive USB hub, or a powered hub--same result.
>
> All I have to do to get this to fail...is... Even if the USB ends are
> not plugged into the computer and the rig control box is powered
> off and
> unplugged from power, if I just touch the metal shield on the USB
> cable
> going to the rig control onto the shield connection in the
> computer or
> hub, that causes the rotor control to fail. When it fails, The
> azimuth
> reading on the G-5500 drops all the way to zero. The elevation
> meter is
> unaffected.
>
> It acts like a ground loop somewhere, but where and how? I've tried
> disconnecting the coaxes from the transceiver but no change.
>
> I'm thinking about scrapping these USB-to-Serial things and going
> to a
> 4-Port Keyspan box.
>
> HELP!!
>
> 73, Larry W7IN - DN27 in Plains, Montana
>
> _______________________________________________
> 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: Thu, 15 Apr 2010 18:26:16 -0700
From: Roger Swickis <rswickis@xxxxx.xxx>
Subject: [amsat-bb] SATPC32
To: amsat-bb@xxxxx.xxx
Message-ID: <90E9A876-6086-4C4E-80CF-49E973137611@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Thanks Mark,
Well, I had the same position data in both AOS and SATPC32.
I don't know what was happening, but it seems to have magically resolved
itself. Both programs now read the same.
Strange. But I think we can attribute it to RF getting into the computer.
At any rate I'm glad I didn't go ahead and reinstall everything.
Oh well - you don't have to be good of you're lucky!
Roger VA7MG
------------------------------
Message: 11
Date: Fri, 16 Apr 2010 05:05:12 -0400
From: "Rich Dailey (Gmail)" <redailey1@xxxxx.xxx>
Subject: [amsat-bb] Re: SATPC32
To: richdailey@xxxxxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <7.0.0.16.2.20100416050055.057be750@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I recall running in circles years ago trying to figure out why two tracking
programs
didn't agree. Turned out it had to do with a daylight savings time flag that
was
(or was not) set correctly. Not sure if this is possible with SATPC32, but
just
thought I'd throw it out there for consumption.
Rich, N8UX
------------------------------
Message: 12
Date: Fri, 16 Apr 2010 09:40:44 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] KP4AO Arecibo Video Streaming
To: amsat-bb@xxxxx.xxx
Message-ID: <902044.38277.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
http://www.ustream.tv/channel/kp4ao-eme
73 Trevor M5AKA
------------------------------
Message: 13
Date: Fri, 16 Apr 2010 05:27:25 -0500
From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxx.xxx>
Subject: [amsat-bb] Arecibo
To: <amsat-bb@xxxxx.xxx>
Message-ID: <02bb01cadd4f$688f0a00$39ad1e00$@xxx>
Content-Type: text/plain; charset="us-ascii"
Here is a good reference for the Arecibo EME event
http://www.k2txb.com/2010_arecibo_operation.htm
nick
Office 337 593 8700
Cell 337 258 2527
Helping UL become a world Class Engineering and Educational School
------------------------------
Message: 14
Date: Fri, 16 Apr 2010 18:04:07 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap
yagis
To: "Douglas Quagliana" <dquagliana@xxx.xxx>, "amsat"
<amsat-bb@xxxxx.xxx>, "Edward Cole" <kl7uw@xxxxxxxxx.xxx>
Message-ID: <007d01cadd7e$71b0a420$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Edward Cole" <kl7uw@xxxxxxxxx.xxx>
To: "Douglas Quagliana" <dquagliana@xxx.xxx>; "amsat" <amsat-bb@xxxxx.xxx>
Sent: Thursday, April 15, 2010 11:49 PM
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap yagis
>
> Or you can split the feedline equally if one
> antenna is spaced 1/4 wavelength ahead of the other. The relation of
> the fed elements determine whether you get RH or LH CP. The center
> conductor is connected to one side of the fed element (this is called
> the + side). If the antenna to the rear (or not with extra feedline)
> is vertical with "+" straight up and the other antenna has its "+"
> element pointing to the right, you get RHCP. Reverse it and you get
> LHCP.
> 73, Ed - KL7UW, WD2XSH/45
Hi Ed, KL7UW
Please find here a necessary amendment to your statement:
We assume that you are looking from the rear of the antenna in direction
of propagation and one antenna is spaced 1/4 wavelenght ahead of the other.
If the dipole of the rear antenna is vertical with "+" straight up and if
the dipole of the front antenna is horizontal and has its "+" element
pointing to the left then you get RHCP. Reverse it and you get LHCP
In a separate email I have sent to you a drawing showing how two linearly
polarized components shifted 90? one to the other adds togheter to generate
a circularly polarized wave but I can send the same drawing to everybody
need it.
> For antennas in the "X" configuration (back antenna "+" up and
> to the left, front antenna "=" up and to the right for RHCP.
If the signe "=" is a typing mistake and you means " - " (minus)
then your statement is correct.
73" de
i8CVS Domenico
------------------------------
Message: 15
Date: Fri, 16 Apr 2010 11:25:16 -0500
From: "Rick - WA4NVM" <wa4nvm@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap
yagis
To: "i8cvs" <domenico.i8cvs@xxx.xx>, "Douglas Quagliana"
<dquagliana@xxx.xxx>, "amsat" <amsat-bb@xxxxx.xxx>, "Edward Cole"
<kl7uw@xxxxxxxxx.xxx>
Message-ID: <7D003FA7A87B4B7D8DA342ED4BC449DF@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi All,
A picture is worth a thousand words.........
http://sv1bsx.50webs.com/antenna-pol/polarization.html
Maybe this will help......
73, Rick WA4NVM
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap yagis
>
> Or you can split the feedline equally if one
> antenna is spaced 1/4 wavelength ahead of the other. The relation of
> the fed elements determine whether you get RH or LH CP. The center
> conductor is connected to one side of the fed element (this is called
> the + side). If the antenna to the rear (or not with extra feedline)
> is vertical with "+" straight up and the other antenna has its "+"
> element pointing to the right, you get RHCP. Reverse it and you get
> LHCP.
> 73, Ed - KL7UW, WD2XSH/45
Hi Ed, KL7UW
Please find here a necessary amendment to your statement:
We assume that you are looking from the rear of the antenna in direction
of propagation and one antenna is spaced 1/4 wavelenght ahead of the other.
If the dipole of the rear antenna is vertical with "+" straight up and if
the dipole of the front antenna is horizontal and has its "+" element
pointing to the left then you get RHCP. Reverse it and you get LHCP
In a separate email I have sent to you a drawing showing how two linearly
polarized components shifted 90? one to the other adds togheter to generate
a circularly polarized wave but I can send the same drawing to everybody
need it.
> For antennas in the "X" configuration (back antenna "+" up and
> to the left, front antenna "=" up and to the right for RHCP.
If the signe "=" is a typing mistake and you means " - " (minus)
then your statement is correct.
73" de
i8CVS Domenico
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Message: 16
Date: Fri, 16 Apr 2010 12:01:54 -0600
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap
yagis
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.1.1.2.20100416115818.00c4ea78@xxx.xxx.xxx>
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At 11:25 AM 4/16/2010 -0500, you wrote:
>Hi All,
>
>A picture is worth a thousand words.........
>
>http://sv1bsx.50webs.com/antenna-pol/polarization.html
>
>Maybe this will help......
>
>73, Rick WA4NVM
Rick,
Thank you for this! Book-marked! When I get the chance to do the much
needed maintenance on my system, I may build new phasing harnesses now.
73, KB7ADL
------------------------------
Message: 17
Date: Fri, 16 Apr 2010 13:20:44 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: "Amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <6HLh1e0051e3qRF05HLipP@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Just copied somebody on CW!
N8MH
At 05:27 AM 4/16/2010 -0500, you wrote:
>Here is a good reference for the Arecibo EME event
>
>
>
>http://www.k2txb.com/2010_arecibo_operation.htm
>
>
>
>
>
>
>
>
>
>
>
>nick
>
>Office 337 593 8700
>
>Cell 337 258 2527
>
>
>
>Helping UL become a world Class Engineering and Educational School
>
>
>
>_______________________________________________
>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
Mark L. Hammond [N8MH]
------------------------------
Message: 18
Date: Fri, 16 Apr 2010 17:34:53 -0000
From: "Steve" <ai7w@xxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: "Amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <E893CC2BECC541FFBFC8230E5C84476A@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
> Just copied somebody on CW!
>
> N8MH
Nothing heard yet in Oregon
...
AI7W
------------------------------
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End of AMSAT-BB Digest, Vol 5, Issue 170
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