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CX2SA > SATDIG 15.04.10 20:11l 343 Lines 10925 Bytes #999 (0) @ WW
BID : AMSATBB5169
Read: GUEST
Subj: AMSAT-BB-digest V5 169
Path: IZ3LSV<IW0QNL<F4BWT<F1BBI<CX2SA
Sent: 100415/1906Z @:CX2SA.LAV.URY.SA #:53404 [Minas] FBB7.00e $:AMSATBB5169
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Circular polarisation question (i8cvs)
2. Call for Papers--2010 ARRL/TAPR Digital Communications
Conference (Ford, Steve, WB8IMY)
3. Re: Arecibo (Edward Cole)
4. Re: Arecibo (MM)
----------------------------------------------------------------------
Message: 1
Date: Thu, 15 Apr 2010 16:21:08 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Circular polarisation question
To: "Phil" <phillor@xxxxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <000001cadca7$43fec660$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Phil" <phillor@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, April 15, 2010 1:19 PM
Subject: [amsat-bb] Circular polarisation question
> Thank you for reading this.
>
> Ten years ago I built a pair of circular polarised aerials primarily for
> satellite use. The UHF aerial has 12 elements in each plane while the VHF
> aerial has 6 elements in each plane. My UHF received signal strength often
> seems to be below that of other stations and so I'm rethinking how I have
> set up these aerials. The received signal strength via VO-52 is S7 at the
> best, without a pre-amplifier, and so I'm happy with that. The UHF aerial
> is where the problem is even thought they are set up in the same way.
>
> Both aerials are mounted in an X orientation. One set of elements is a
> quarter wave ahead of the other set. Because of the X mounting I cannot
> tell if the vertical set is ahead of the horizontal set or not. Each
> aerial is fed via a power splitter via equal length cables.
>
> My question is; does this sound like a correctly set up right hand
> polarised aerial? Originally I thought it was now I'm not sure.
>
> --
> Regards,
> Phil
>
Hi Phil
Since one set of elements is a quarter wave ahead of the other and each
aerial is fed via a power splitter via equal lenght of coax cable then your
antenna is circularly polarized.
Depending to which side of each dipole you have connected the inner
conductor and the braid of the coax cable the polarization can be RHCP
or LHCP
If you remember how the inner conductors and the braid of coax cables are
connected the the rear dipole and to the front dipole it is possible to
determine if the polarization is RHCP or LHCP
By the way for general information if you add a 1/2 electrical waveleght of
coax cable to the fed line suppliyng the front dipole than the sense of
polarization reverses from RHCP to LHCP or vice versa.
In a separate email I have sent to you a drawing showing how both linear
polarized fields components of your antennas adds to generate a resultant
circularly polarized wave.
Since the drawing is made using two crossed driving elements one vertical
and the other horizontal you only must ideally rotate the drawing right hend
or left hend by 45 degrees and nothing changes in your reasoning.
By the way your antenna is circularly polarized for sure but without to make
the above analisys it is impossible to say if RHCP or LHCP
Have fun
73" de
i8CVS Domenico
------------------------------
Message: 2
Date: Thu, 15 Apr 2010 14:12:25 -0400
From: "Ford, Steve, WB8IMY" <sford@xxxx.xxx>
Subject: [amsat-bb] Call for Papers--2010 ARRL/TAPR Digital
Communications Conference
To: "RTTY Reflector" <rtty@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>,
<vhf@xxxx.xxxxxxxx.xxx>, <psk31@xxxxxxx.xx.xxx.xx>,
<digitalradio@xxxxxxxxxxx.xxx>
Message-ID:
<145372871023544E98881538F29B1DFC01B03818@xxxxxxxx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Technical papers are solicited for presentation at the 29th Annual ARRL
and TAPR Digital Communications Conference to be held September 24-26,
2010 near Portland, Oregon. These papers will also be published in the
Conference Proceedings (you do NOT need to attend the conference to have
your paper included in the Proceedings). The submission deadline is July
31, 2010. Please send papers to:
Maty Weinberg
ARRL
225 Main St
Newington, CT 06111
or you can make your submission via e-mail to: maty@xxxx.xxx
Papers will be published exactly as submitted and authors will retain
all rights.
73 . . . Steve, WB8IMY
ARRL
------------------------------
Message: 3
Date: Thu, 15 Apr 2010 10:22:00 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <201004151822.o3FIM1nv067846@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 08:23 AM 4/15/2010, Bob- W7LRD wrote:
>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
>_______________________________________________
>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
Bob,
A good question since they will be using SSB, initially. I do not
operate eme on 432+ but I believe that normal calling is done on
2-1/2 minute sequences. I suspect that will not be done with Arecibo
(but they should say what their operating protocol will be).
Normal eme protocol goes like this:
CQ de KP4AO calls for 2.5 minutes
KP4AO de KL7UW means KL7UW copied KP4AO call sign (not calling in the
blind); calls for 2.5 minutes
KL7UW de KP4AO signal report (May be RST or OOO); also means Arecibo
copied both KP4AO and KL7UW's call sign; gives report for 2.5 minutes
KP4AO de KL7UW roger your report (RO) and/or RST; for 2.5 minutes
KL7UW de KP4AO RRR means I copied your report; for 2.5 minutes
KP4AO de KL7UW 73 and SK; end of successful contact; for 2.5 minutes
total time 15-minutes
So with 2:45 hours of operation 11 QSO's could be made; so I do not
expect the usual 2.5 minute time sequence.
That is usual for CW and digital eme, but I do not know what is
likely to ensue with the expected pile up on SSB. But for proper eme
both calls must be given and confirmed (unlike HF were only one call
is stated and the other station, assumed).
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: 4
Date: Thu, 15 Apr 2010 11:59:42 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>, amsat-bb@xxxxx.xxxxxxxxxxx Cole
<kl7uw@xxxxxxxxx.xxx>
Message-ID: <102441.410.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
FYI,
If you leave near some Military locations in the USA
You will have 50 watt PEP limitation.
The satellite mode of 611 ERP only applies to 435-438mc and not
the eme segment of 432
If you are out side of a military zone, then normal power rules apply.
?97.313 Transmitter power standards.
(f) No station may transmit with a transmitter power exceeding 50 W
PEP on the UHF 70
cm band from an area specified in footnote US7 to ?2.106 of the FCC
Rules, unless
expressly authorized by the FCC after mutual agreement, on a case-by-case
basis,
between the District Director of the applicable field facility and the
military area
frequency coordinator at the applicable military base. An Earth
station or telecommand
station, however, may transmit on the 435-438 MHz segment with a
maximum of 611 W
effective radiated power (1 kW equivalent isotropically radiated
power) without the
authorization otherwise required. The transmitting antenna elevation
angle between the
lower half-power (-3 dB relative to the peak or antenna bore sight)
point and the
horizon must always be greater than 10?.
And from US7
(e) In the State of Massachusetts within a 160-kilometer (100 mile)
radius around locations at Otis Air Force Base, Massachusetts
(latitude 41?45' North, longitude 70?32' West);
--- On Thu, 4/15/10, Edward Cole <kl7uw@xxxxxxxxx.xxx> wrote:
> From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
> Subject: [amsat-bb] Re: Arecibo
> To: "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
> Date: Thursday, April 15, 2010, 2:22 PM
> At 08:23 AM 4/15/2010, Bob- W7LRD
> wrote:
>
>
> >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
> >_______________________________________________
> >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
>
> Bob,
>
> A good question since they will be using SSB,
> initially.? I do not
> operate eme on 432+ but I believe that normal calling is
> done on
> 2-1/2 minute sequences.? I suspect that will not be
> done with Arecibo
> (but they should say what their operating protocol will
> be).
>
> Normal eme protocol goes like this:
> CQ de KP4AO? calls for 2.5 minutes
> KP4AO de KL7UW means KL7UW copied KP4AO call sign (not
> calling in the
> blind); calls for 2.5 minutes
> KL7UW de KP4AO signal report (May be RST or OOO); also
> means Arecibo
> copied both KP4AO and KL7UW's call sign; gives report for
> 2.5 minutes
> KP4AO de KL7UW roger your report (RO) and/or RST; for 2.5
> minutes
> KL7UW de KP4AO RRR? means I copied your report; for
> 2.5 minutes
> KP4AO de KL7UW 73 and SK;? end of successful contact;
> for 2.5 minutes
> total time 15-minutes
>
> So with 2:45 hours of operation 11 QSO's could be made; so
> I do not
> expect the usual 2.5 minute time sequence.
>
> That is usual for CW and digital eme, but I do not know
> what is
> likely to ensue with the expected pile up on SSB.? But
> for proper eme
> both calls must be given and confirmed (unlike HF were only
> one call
> is stated and the other station, assumed).
>
>
> 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
>
------------------------------
_______________________________________________
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 169
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