| |
CX2SA > SATDIG 16.04.10 20:08l 466 Lines 14550 Bytes #999 (0) @ WW
BID : AMSATBB5171
Read: GUEST
Subj: AMSAT-BB-digest V5 171
Path: IZ3LSV<IW0QNL<F4BWT<F1BBI<CX2SA
Sent: 100416/1904Z @:CX2SA.LAV.URY.SA #:53613 [Minas] FBB7.00e $:AMSATBB5171
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Arecibo (Ernie Howard)
2. Re: Arecibo (Sebastian)
3. Re: Arecibo (Alan P. Biddle)
4. Re: Arecibo and circular polarization using cheap yagis
(Edward Cole)
5. Re: Arecibo (Edward Cole)
6. Fwd: [Moon-net] Arecibo Update from the Op room.. (Edward Cole)
7. Re: Arecibo (Edward Cole)
----------------------------------------------------------------------
Message: 1
Date: Fri, 16 Apr 2010 13:42:09 -0400
From: Ernie Howard <w8eh.ernie@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: amsat-bb@xxxxx.xxx
Message-ID: <4BC8A171.7030900@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I've heard nothing the last hour.
W8EH
On 4/16/2010 1:20 PM, Mark L. Hammond wrote:
> Just copied somebody on CW!
>
> N8MH
>
>
------------------------------
Message: 2
Date: Fri, 16 Apr 2010 13:45:34 -0400
From: Sebastian <w4as@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: "Mark L.Hammond" <marklhammond@xxxxx.xxx>
Cc: AMSAT BB <AMSAT-BB@xxxxx.xxx>
Message-ID: <4141F900-265D-4987-B3BE-59B3834BE01B@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I can hear very faint CW from them.
I'm surprised as I have just a single yagi, and apparently their amp isn't
working.
73 de W4AS
On Apr 16, 2010, at 1:20 PM, Mark L. Hammond wrote:
> Just copied somebody on CW!
>
> N8MH
------------------------------
Message: 3
Date: Fri, 16 Apr 2010 12:50:59 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: "'Sebastian'" <w4as@xxxxxxxxx.xxx>
Cc: 'AMSAT BB' <AMSAT-BB@xxxxx.xxx>
Message-ID: <6DE99B90832444EE9CF6E03A21864597@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Also hearing them. Be certain, if you can, to try different polarity. It
does make a difference.
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Sebastian
Sent: Friday, April 16, 2010 12:46 PM
To: Mark L.Hammond
Cc: AMSAT BB
Subject: [amsat-bb] Re: Arecibo
I can hear very faint CW from them.
I'm surprised as I have just a single yagi, and apparently their amp isn't
working.
73 de W4AS
On Apr 16, 2010, at 1:20 PM, Mark L. Hammond wrote:
> Just copied somebody on CW!
>
> N8MH
_______________________________________________
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: Fri, 16 Apr 2010 10:20:17 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap
yagis
To: "Rick - WA4NVM" <wa4nvm@xxxxxxx.xxx>, "i8cvs"
<domenico.i8cvs@xxx.xx>, "Douglas Quagliana" <dquagliana@xxx.xxx>,
"amsat" <amsat-bb@xxxxx.xxx>
Message-ID: <201004161820.o3GIKItd059600@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
At 08:25 AM 4/16/2010, Rick - WA4NVM 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
>
>
>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
>
>
>
>
>
>
>
>
>_______________________________________________
>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
OK, that seems counterintuitive, but I guess I
was not accounting for both driven elements to be
fed in-phase. The electrical vector must rotate
clockwise to produce RHCP, and so it does in
Domenico's drawing. Dom's drawing actually shows
the rear driven element horizontal and the
forward driven element vertical, but its the
relationship that produces the rotation so does
not matter (i.e. they both could be angled +45
and -45 degrees in the "X" configuration). I
guess my confusion was not accounting for both elements being driven in-phase.
My M2 436CP42 looks just like Dom's drawing but
it has a 1/2 wavelength longer phasing line
between the rear and front driven elements. They
say this is the setup for RHCP? It would seem
the M2 system would have the front antenna
180-degrees out of phase? So would that not
produce LHCP? It is actually easier to visualize
with both elements at the same point on the boom
and one fed with a 1/4 wave longer feed line.
Nice thing about helical antennas is the
corkscrew turns in the direction of the rotating wave.
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: 5
Date: Fri, 16 Apr 2010 10:38:08 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <201004161838.o3GIcAhh016990@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Alan,
Are you saying try a different CP? If you are linear it should not
matter what orientation you chose (that is assuming Arecibo is
CP). I am not ready with the dish so I quickly tried with my M2
11-element yagi (fixed on horizon) into 0.5 dB GasFet Preamp (Moon
was 14-deg elevation). Nothing heard on their published freq. of
432.045. Now I see they were on 432.040 (didn't tune that far
down). If they were running 20w instead of 400w that is -23 dB on
their signal which will make it hard for small yagis to copy (even CW
with narrow filters).
Back to work on the dish.
My 436CP42 is out of commission due to apparently burning out the
pots in my B5400 az-el rotator (long story).
73, Ed - KL7UW
At 09:50 AM 4/16/2010, Alan P. Biddle wrote:
>Also hearing them. Be certain, if you can, to try different polarity. It
>does make a difference.
>
>Alan
>WA4SCA
>
>
>
>-----Original Message-----
>From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>Behalf Of Sebastian
>Sent: Friday, April 16, 2010 12:46 PM
>To: Mark L.Hammond
>Cc: AMSAT BB
>Subject: [amsat-bb] Re: Arecibo
>
>I can hear very faint CW from them.
>
>I'm surprised as I have just a single yagi, and apparently their amp isn't
>working.
>
>73 de W4AS
>
>On Apr 16, 2010, at 1:20 PM, Mark L. Hammond wrote:
>
> > Just copied somebody on CW!
> >
> > N8MH
>_______________________________________________
>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
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: 6
Date: Fri, 16 Apr 2010 10:58:06 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Fwd: [Moon-net] Arecibo Update from the Op room..
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <201004161858.o3GIw7lc062897@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Forward from Arecibo (reported on MoonNet):
>From: Patrick Barthelow <apolloeme@xxxx.xxx>
>To: <moon-net@xxxxxxxxx.xxxxxx.xxx>
>Date: Fri, 16 Apr 2010 11:34:57 -0700
>Folks,
>
>
>
>Looks like plenty of updates on Arecibo. I am writing from just
>behind the current op team of Jim Breakall, and Joe Taylor and
>Angel Vazquez. AS has been mentioned, the
>
> 3CX-800PA is off line now, but we expect a serious look later
> after today's Arecibo window closes. Good to see a lot of
> technical talent and spirit among the team for repairing things and
> getting the job done, also good to see lots of caution exercised
> towards jumping in to find where we lost B+ from the PS to the
> amp. No need to rush at the expense of safety...Dr Breakall will
> look at the 3CX800 amp after the Moon window closes and will
> hopefuly add about 13 db to our signal tomorrw and Sunday.
>
>Wonderful, very tropical forest venue here, with exotic birds coming
>and going here at operating position, probably wondering about the
>beeps they hear. Sounds like 20 M CW generally here....Lots of
>fun. -Looking forward tomorrow to take a climb to the focus
>platform of the antenna.. Best, 73, Pat AA6EG Echoes of Apollo/Arecibo
>
>
>
>_________________________________________________________________
>The New Busy is not the old busy. Search, chat and e-mail from your inbox.
>http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL
:en-US:WM_HMP:042010_3
>_______________________________________________
>Moon-Net posting and subscription instructions are at
>http://www.nlsa.com/nets/moon-net-help.html
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: 7
Date: Fri, 16 Apr 2010 10:59:03 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <201004161859.o3GIx4md063017@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Sorry, -13 dB. Kind of distracted with getting my dish set up.
73, Ed - KL7UW
At 10:38 AM 4/16/2010, Edward Cole wrote:
>Alan,
>
>Are you saying try a different CP? If you are linear it should not
>matter what orientation you chose (that is assuming Arecibo is
>CP). I am not ready with the dish so I quickly tried with my M2
>11-element yagi (fixed on horizon) into 0.5 dB GasFet Preamp (Moon
>was 14-deg elevation). Nothing heard on their published freq. of
>432.045. Now I see they were on 432.040 (didn't tune that far
>down). If they were running 20w instead of 400w that is -23 dB on
>their signal which will make it hard for small yagis to copy (even CW
>with narrow filters).
>
>Back to work on the dish.
>My 436CP42 is out of commission due to apparently burning out the
>pots in my B5400 az-el rotator (long story).
>
>73, Ed - KL7UW
>
>At 09:50 AM 4/16/2010, Alan P. Biddle wrote:
> >Also hearing them. Be certain, if you can, to try different polarity. It
> >does make a difference.
> >
> >Alan
> >WA4SCA
> >
> >
> >
> >-----Original Message-----
> >From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> >Behalf Of Sebastian
> >Sent: Friday, April 16, 2010 12:46 PM
> >To: Mark L.Hammond
> >Cc: AMSAT BB
> >Subject: [amsat-bb] Re: Arecibo
> >
> >I can hear very faint CW from them.
> >
> >I'm surprised as I have just a single yagi, and apparently their amp isn't
> >working.
> >
> >73 de W4AS
> >
> >On Apr 16, 2010, at 1:20 PM, Mark L. Hammond wrote:
> >
> > > Just copied somebody on CW!
> > >
> > > N8MH
> >_______________________________________________
> >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
>
>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
>======================================
>
>_______________________________________________
>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
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
======================================
------------------------------
_______________________________________________
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 171
****************************************
Read previous mail | Read next mail
| |
