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CX2SA > SATDIG 14.05.13 21:16l 536 Lines 18006 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Satellite Demonstration Passes for Dayton 2013 (Keith D Pugh)
2. Re: Helical Antenna on 70 cm (i8cvs)
3. Re: ISS HamTV Frequencies (Peter Guelzow)
4. Re: ISS HamTV Frequencies (I0ELE)
5. ISS - HAMTV - Tutionne Software for DATV (I0ELE)
6. Re: ISS HamTV Frequencies (Graham Shirville)
7. Up-tilted beams (15 degree optimum) (Robert Bruninga)
8. Re: ISS HamTV Frequencies (Matty Cunningham)
9. ANS-134 ANS Special Bulletin - NASA Announces Fox-1 Launch
Date (JoAnne Maenpaa)
10. Re: Helical Antenna on 70 cm (Dave W?DHB)
----------------------------------------------------------------------
Message: 1
Date: Tue, 14 May 2013 01:26:27 -0400 (EDT)
From: Keith D Pugh <pughkeithd@xx.xxx>
To: rolf.krogstad@xxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Satellite Demonstration Passes for Dayton 2013
Message-ID: <8D01E7AB7DE8714-87C-126D7@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
We will use the callsign of the control operator at the time. I imagine
W5IU will be used a lot.
73 - Keith, W5IU
What callsign will be used - W5IU?
de Rolf NR0T
------------------------------
Message: 2
Date: Tue, 14 May 2013 07:39:19 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>, "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>,
"Rolf Krogstad" <rolf.krogstad@xxxxx.xxx>
Subject: [amsat-bb] Re: Helical Antenna on 70 cm
Message-ID: <000001ce5065$b96d7380$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Rolf, NR0T
The KLM has the model 435-40CX crossed yagi i.e. a 20+20
crossed elements complete with a on board switching relay
and phasing harness to get RHCP or LHCP from the shack
Since the above model is relatively old I don't know if you can
get one of it actually in USA but the KLM now M2 produces
similar models with better performance.
I have a 435-40CX still available on market in Italy at convenient
and reduced price and it works very well.
Just for experimentation I have modified and upgraded this antenna
to get four polarizations H-V-RHCP-LHCP on switching from
the shack using four small coax relays and phasing harness on board
of the antenna.
You can see this modifications reading my articles " Switching four
Polarization on a 70 cm Crossed Yagi" published by the
AMSAT Journal March/April 2007 Part-1 and May/June 2007
Part-2
Have fun !
73" de
i8CVS Domenico
----- Original Message -----
From: "Rolf Krogstad" <rolf.krogstad@xxxxx.xxx>
To: "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, May 14, 2013 4:04 AM
Subject: [amsat-bb] Re: Helical Antenna on 70 cm
> Thanks, Bob.
>
> Is there a commercial yagi available for 435 MHz which is R-L switchable?
>
> Rolf NR0T
>
>
> On Mon, May 13, 2013 at 8:21 PM, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
>
> > the helix is a nice antenna...however...once wound for either RHCP or
> > LHCP there's no going back. So switching from R to L or L to R is
> > out of the question. Unless of course the chosen polarity is always
> > compatible with the satellite in use. Unless you have L and a R helix
> > and switch between them, that can get a "little" involved.
> > Many times it is very convenient to be able to switch between L or R
> > during a pass, at times it can make the contact happen.
> > This is of course is easy with a L/R CP yagi. I have used a helix for
> > L band (1.2ghz ) as well as feeds for a 2.4ghz dish. They are a fine
> > antenna with a fair amount of bandwidth.
> > For a 16+ turn helix I have used stainless steel "U" channel for
> > the center support.
> > If Clair, VE3NPC is listening, he's the resident helix guy.
> > Just my opinion, your mileage may differ.
> > 73 Bob W7LRD
> > Seattle
> >
> > ------------------------------
> > *From: *"Rolf Krogstad" <rolf.krogstad@xxxxx.xxx>
> > *To: *amsat-bb@xxxxx.xxx
> > *Sent: *Monday, May 13, 2013 9:22:57 AM
> > *Subject: *[amsat-bb] Helical Antenna on 70 cm
> >
> >
> > I am new to satellites and new to the design requirements for UHF and am
> > looking for advice.
> >
> > I am looking to build a Helical antenna for the 70cm Band. I am
> > considering the plans for such an antenna from the 2010 edition of the
> > ARRL Satellite Handbook. The plans call for a 235 cm (7' 8") long,
> > 2.5 cm (1")
> > diameter center support made of either a wooden dowel which has been
> > treated or a fiberglass tube. It also requires multiple 7.6 cm (3")
> > spacers for the helical element.
> >
> > My question is would fiberglass rods made of "Isophthlic Polyester
> > Resin" be a good choice of material at UHF frequencies?
> > I hesitate to use treated wood because I plan to mount this on the top
> > of a 15 meter high tower and it isn't very accessible.
> >
> > Thanks
> >
> > Rolf NR0T
> > [EN34]
> > _______________________________________________
> > 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: 3
Date: Tue, 14 May 2013 08:28:16 +0200
From: Peter Guelzow <peter.guelzow@xxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ISS HamTV Frequencies
Message-ID: <5191D980.80503@xxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Dan,
the DVB Encoder and Modulator comes from
http://sr-systems.de/content.php?show=Startseite&lng=eng&style=std
The developers are hams and this stuff is available and used for D-ATV
in Germany since several years.
73s Peter DB2OS
On 14.05.2013 05:03, Daniel Schultz wrote:
> I would research the matter carefully before buying any equipment, does
anyone
> in the ISS HamTV group have any data on which DVB-S receivers will work?
This
> is pretty much beyond what the gear was designed for!
>
> Dan Schultz N8FGV
>
> ------ Original Message ------
> Received: Mon, 13 May 2013 10:52:22 PM EDT
> From: Greg D <ko6th.greg@xxxxx.xxx>
> To: M5AKA <m5aka@xxxxx.xx.xx>Cc: Daniel Schultz <n8fgv@xxx.xxx>,
> amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: ISS HamTV Frequencies
>
>> 2 mhz? Yeah, that would be tough... Ok, DVB-S it is.
>>
>> Thanks all for the education. There's a swap meet coming up in a couple
>> of weeks... Sounds like I have a now have a mission. :-)
>>
>> Greg KO6TH
>
> _______________________________________________
> 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: Tue, 14 May 2013 09:49:13 +0200
From: I0ELE <emanuele.dandria@xxxxx.xx>
To: amsat-bb@xxxxx.xxxx Daniel Schultz <n8fgv@xxx.xxx>
Subject: [amsat-bb] Re: ISS HamTV Frequencies
Message-ID: <5191EC79.3040608@xxxxx.xx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Hi Dan,
we have tested two alternatives: one is a decoder on a PC Card and the
other one is a commercial set top box.
The PC Card that we tested is Technotrend S2-3200 (around ?60,00) and
you can also use a very powerful software TUTIONNE (free) developed by
Jean Pierre F6DZP. There is also a cheaper version, which F6DZP tested,
which is Technotrend S2-1600. Check that your PC can host a standard PCI
card.
The set top box that we tested is Megasat 400 (around ?40/50) but most
of commercial set top boxes are specified to work from 1 to 45 MSym/s.
Remember that HAMTV can transmit a 1.3 MSym/s or a 2.0 MSym/s stream.
Emanuele I0ELE
Il 14/05/2013 5.03, Daniel Schultz ha scritto:
> I would research the matter carefully before buying any equipment, does
anyone
> in the ISS HamTV group have any data on which DVB-S receivers will work?
This
> is pretty much beyond what the gear was designed for!
>
> Dan Schultz N8FGV
>
> ------ Original Message ------
> Received: Mon, 13 May 2013 10:52:22 PM EDT
> From: Greg D <ko6th.greg@xxxxx.xxx>
> To: M5AKA <m5aka@xxxxx.xx.xx>Cc: Daniel Schultz <n8fgv@xxx.xxx>,
> amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: ISS HamTV Frequencies
>
>> 2 mhz? Yeah, that would be tough... Ok, DVB-S it is.
>>
>> Thanks all for the education. There's a swap meet coming up in a couple
>> of weeks... Sounds like I have a now have a mission. :-)
>>
>> Greg KO6TH
>
> _______________________________________________
> 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: 5
Date: Tue, 14 May 2013 09:58:26 +0200
From: I0ELE <emanuele.dandria@xxxxx.xx>
To: Daniel Schultz <n8fgv@xxx.xxx>, amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ISS - HAMTV - Tutionne Software for DATV
Message-ID: <5191EEA2.1080003@xxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Daniel the software I mentioned can be downloaded here:
http://www.vivadatv.org/viewtopic.php?f=60&t=63
Emanuele I0ELE
------------------------------
Message: 6
Date: Tue, 14 May 2013 12:17:56 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "Peter Guelzow" <peter.guelzow@xxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS HamTV Frequencies
Message-ID: <D6935ACEF45041BC955C88F202040774@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi all
There is a DATV forum on the BATC website and there is also a DATV forum on
yahoo groups.
There is already plenty of DVB-S ATV activity in Europe, the US and
Australia. The low symbol rate planned for the ISS activities cuts down the
choice for available decoders but known to work are the Technotrend
TT-budget S2-1600 and 3200 cards. They are available on the web from
various suppliers.
Hope this helps
73
Graham
G3VZV
-----Original Message-----
From: Peter Guelzow
Sent: Tuesday, May 14, 2013 7:28 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ISS HamTV Frequencies
Hi Dan,
the DVB Encoder and Modulator comes from
http://sr-systems.de/content.php?show=Startseite&lng=eng&style=std
The developers are hams and this stuff is available and used for D-ATV
in Germany since several years.
73s Peter DB2OS
On 14.05.2013 05:03, Daniel Schultz wrote:
> I would researchhere
the satellites spend most of their time.
The only benefit to the high tilt angle is improved performance during the
3% of the time the satellite is above 60 degrees. And is that worth
giving up gain for the 70% of all other pass times? Further, when the
satellite is that high the signal is already 6 to 10 dB stronger than it
was on the horizon anyway. How much better does one need to hear an
already excellent signal? (so as to sacrifice the other 70%)?
But again, if the antenna is in a hole and cannot see anywhere close to
the horizon anyway, then of course, tilt the main beam up to point right
at the lowest available horizon where the gain is needed most. Bob,
WB4aPR
> Bob, depending on the antenna pattern and the ground, as you say,
> 15 degrees might be too low for any additional help toward the horizon.
> 30 to 35 degrees will give you a little better results for stuff that
isn't just
> right at the horizon, I feel. As with all things in this hobby,
experimentation
> with your equipment will allow you to find the best combination.
Also why sacrifice 3 dB for all terrestrial operations too which are also
on the horizon?
On 5/13/2013 11:29 AM, Robert Bruninga wrote:
>> As has been said many times, most satellite passes are never
>> "directly overhead", but rather on some inclination across the sky.
>> A 5 element yagi antenna, at a 35 degree angle from the horizon,
>> with only an asmuth rotator, will let you work far more satellites
>> for
> the money spent.
>
> Except that the correct angle is 15 degrees not 30 or 35. At 15
> degrees, the main gain lobe of the antenna still has excellent gain on
> the horizon where you need it most and an equal gain all the way up to
30
> degrees or so. Below 30 degrees is where satellites spend 80+% of
their
> in-view times. This is where you need the gain most. But when the
> satellite is above 30 degrees, the satellite is at least 6 to 10 dB
> closer and so it makes no sense to sacrifice gain on the horizon
> (where you need it most) by placing it at 30 degrees where you need it
least.
>
> See http://aprs.org/rotator1.html
>
> Ignore the topic of the page but look very carefullyl at the SCALE
> drawing (Yes, that is drawn to scale) of a LEO satellite pass Notice
> how 95% of all satellite access times are below 50 degrees and 70% of
> the time they are below 22 degrees. That is where you need the gain.
> Do not waste it by tilting the antenna up more than 15 degrees.
>
> The only exception is that if your beam antenna cannot see the horizon
> anyway, then, yes, tilt it up a little more since you wont hear the
> low stuff anyway...
>
> Bob, WB4aPR
>
>
>
> Gregg Wonderly
>
> On 5/12/2013 12:48 PM, Jeff Moore wrote:
>> I wouleceivers use 'L-Band' and can do 950Mhz to around 2Ghz -
would be great if we could tweak this, or perhaps inject the 2.4ghz signal
after the internal tuning stage, with a bit of buffering /amplification ?? :)
Looking at this:-
http://www.tbsdtv.com/products/tbs8920-dvb-s2-tv-tuner-pci-card.html
or this:-
http://www.proftuners.com/review_prof_7301.html
- Just as a quick search - it looks like we could use these type of devices
for 'decoding' the DVB stream, rather than going for the physical 'lump' and
extra expense of a set-top box.
Matty
MD0MAN
Date: Mon, 13 May 2013 21:33:13 +0100 (BST)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: Daniel Schultz <n8fgv@xxx.xxx>, amsat-bb@xxxxx.xxxxxxxxx Dolkas
<ko6th.greg@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS HamTV Frequencies
Message-ID:
<1368477193.60216.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
--- On Mon, 13/5/13, Greg Dolkas <ko6th.greg@xxxxx.xxx> wrote:
> Is there something about the DVB-S modulation that makes it
> astoundingly better for this application?? For
> something that is intended to be widely received, they sure
> are making it difficult...
DVB-S receivers are in use in hundreds of millions of homes around the
world. Apart from DVB-S2, which is not yet so widespread, I'm not aware of
any other standard that would deliver better performance in a 2 MHz bandwidth.
73 Trevor M5AKA
------------------------------
Message: 9
Date: Tue, 14 May 2013 09:13:37 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: "'amsat-bb'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ANS-134 ANS Special Bulletin - NASA Announces
Fox-1 Launch Date
Message-ID: <001301ce50ad$3abea520$b03bef60$@xxx>
Content-Type: text/plain; charset="us-ascii"
AMSAT NEWS SERVICE SPECIAL BULLETIN
ANS-134
SB SAT @ AMSAT $ANS-134.01
ANS-134 ANS Special Bulletin - NASA Announces Fox-1 Launch Date
AMSAT News Service Bulletin 134.01
>From AMSAT HQ SILVER SPRING, MD.
May 14, 2013
To All RADIO AMATEURS
BID: $ANS-134.01
NASA announced Monday that AMSAT's Fox-1 spacecraft has been
assigned for launch in 2014. For details on the launch vehicle,
targeted launch date, orbit specifics, and more, please attend
the AMSAT Forum or visit the AMSAT booth at the Dayton Hamven-
tion this weekend. Watch http://www.amsat.org and the AMSAT News
Service for more details to follow.
[ANS thanks AMSAT Vioe President Engineeing Tony Monteiro,
AA2TX for the above information]
------------------------------
Message: 10
Date: Tue, 14 May 2013 09:31:07 -0600
From: Dave W?DHB <dave@xxxxx.xxx>
To: "'Rolf Krogstad'" <rolf.krogstad@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Helical Antenna on 70 cm
Message-ID: <000e01ce50b8$0e3c23f0$2ab46bd0$@xxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
A good source of antennas and antenna advice is Dave W6OAL
http://www.hamtv.com/oal.html
He likes Loop yagis for 23cm
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Rolf Krogstad
Sent: Monday, May 13, 2013 10:23 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Helical Antenna on 70 cm
I am new to satellites and new to the design requirements for UHF and am
looking for advice.
I am looking to build a Helical antenna for the 70cm Band. I am considering
the plans for such an antenna from the 2010 edition of the ARRL Satellite
Handbook. The plans call for a 235 cm (7' 8") long, 2.5 cm (1") diameter
center support made of either a wooden dowel which has been treated or a
fiberglass tube. It also requires multiple 7.6 cm (3") spacers for the
helical element.
My question is would fiberglass rods made of "Isophthlic Polyester Resin"
be a good choice of material at UHF frequencies?
I hesitate to use treated wood because I plan to mount this on the top of a
15 meter high tower and it isn't very accessible.
Thanks
Rolf NR0T
[EN34]
_______________________________________________
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 8, Issue 157
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