On Sun, May 12, 2013 at 09:22:13PM -0700, Art McBride wrote:
Jeff,
You are correct, a J Pole is an end fed dipole on its side. Max gain at the
horizon and extinction at 90 degree elevation. The J section is for matching
and does not radiate. Gain = 2.1 dBi at the horizon.
Absolutely perfect
hi forgive me if i am wrong but is HO-68 operational again for SSB,FM ...ect
during your demo, i thought that they were still haveing problems with it, or
is it back to normal?
i am going so i will stop by,
Rodney
kc0zhf
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Farrell,
HAMTV equipment will be delivered to the ISS in August (TBC) by the
Japanese HTV-4 cargo.
You can check on the web the exact date.
Then we will start the commissioning soon and we will start the
transmissions soon after.
Information on the transmission plan will be delivered on this
Typo on my earlier email I meant HTV-4 not ATV-4 and so launch date is
different around August ?
ARISS Antennas Installed on Columbus http://www.ariss-eu.org/columbus.htm
73 Trevor M5AKA
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Only the beacon works on HO-68. The satellite is very useful for testing your
tracking and Doppler correction setup, and to demonstrate *receiving* an
amateur satellite.
73, Steve N9IP
--
Steve Belter, s...@wintek.com
On May 13, 2013, at 3:06 AM, Rodney Waln kc0...@yahoo.com wrote:
hi
One needs to also realize duration. The time say above 70 degree
elevation (where rates are highest) are less than 2% of the total pass
times. Not worth worrying about. Similarly, a LEO satellite spends 70%
of its time below about 22 degrees. (but it is far away and needs max
gain). So simply
Thanks, Dan. That helps a lot.
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...
Greg. KO6TH
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Sent from my new toy... Please ignore tupos.
Daniel
Yes, any 1/2wave or 5/8 wave antenna system doubles the horizontal power by
eliminating the power going up. So, it is more like a donut in emission
pattern, whereas the 1/4 antenna is a hemispherical (half a ball) emission pattern.
With satellites, you clearly need to go up.
As has been said
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 antenna, that I want to build, is described in a paper
(probably 20 years old) by Dick, WD4FAB, titled 'Antennas for
microsat ground stations', and the paper describes the large time,
a LEO remains at low elevations - about 76 % below 20 degrees -
and then concludes, that this is fine for
The antenna, that I want to build, is described in a paper (probably 20
years old)
by Dick, WD4FAB, titled 'Antennas for microsat ground stations', and the
paper
describes the large time, a LEO remains at low elevations - about 76 %
below 20 degrees -
and then concludes, that this is fine for
Thank you for your advice - very much appreciated.
The beauty of the J-Pole, I have in mind, is, that it contains
both 2m and 70cm Systems on one mast - so I could simply attach
the two cables going to the IC910 directly hi
The little yagi, I used, has a gain of 5.5 dBd for 2 meters and
Back when I was on the FM sats I used a small yagi for 2m and another
one for 70cm. I built a mast out of some 2 PVC that came out to a T
and had 45 degree elbows on it. I then mounted the antennas on the
elbows so that they were pointed roughly 45 degree up. The whole thing
was mounted to
Hi,
There is an interesting, positive short review of the Elk 2M/440L5 in the June
issue of QST, page 56.
He covers both satellite and terrestrial VHF contest use. If you are a League
member and don't have
the paper issue, the article by Steve Ford, WB8IMY is available for download or
on line
The Camb-Hams group GS3PYE/P are active until May 16 from the Isle of Mull,
Grid IO76, in Scotland. Listen out for them on VO-52 and FO-29.
GS3PYE/P
http://www.southgatearc.org/news/may2013/gs3pye.htm
73 Trevor M5AKA
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--- On Mon, 13/5/13, Greg Dolkas ko6th.g...@gmail.com 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
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,
What callsign will be used - W5IU?
de Rolf NR0T
-- Forwarded message --
From: Keith Pugh w...@swbell.net
To: amsat-bb@amsat.org
Cc:
Date: Mon, 13 May 2013 00:03:08 -0500
Subject: [amsat-bb] Satellite Demonstration Passes for Dayton 2013
Here are the Satellite Demonstration
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,
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
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 w7...@comcast.net 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
Hi Rolf,
My understanding is that the material used for center pole in a helix
doesn't affect the antenna dimensions or performance much at all. So,
feel free to use whatever material you have handy that will work
mechanically and environmentally (e.g. ice load and sun exposure). I've
Hi Rolf,
I don't believe that's possible. It would be like asking for a screw
that can be turned in either direction. L / R switching is done by
switching between two antennas.
Greg KO6TH
Rolf Krogstad wrote:
Thanks, Bob.
Is there a commercial yagi available for 435 MHz which is R-L
M2 makes one, and I think Gulf Alpha antennas has one.
73, Jim KQ6EA
On 05/14/2013 02:04 AM, Rolf Krogstad wrote:
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 w7...@comcast.net wrote:
the
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
M5AKA wrote:
--- On Mon, 13/5/13, Greg Dolkasko6th.g...@gmail.com wrote:
Is there
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
Hi Rolf, NR0T
The fiberglass rods made of Isophthlic Polyester Resin
is a good choice of material at UHF frequencies and it is
the material I have used for my RHCP 10 turns Helical
Antenna for 435 MHz in use on the roof since 1976
beginning from OSCAR-8 Mode-J and actually working
since than for
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
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