How often is that mode enabled? Just passed over EM15 and I could
hear occasional AX.25 on 145.825 but no answer from a DTMF burst ...
--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!
Stupid auto correct, ISS passes.
Rick Tejera K7TEJ
Saguaro Astronomy Club
www.SaguaroAstro.org
Thunderbird Amateur Radio Club
www.w7tbc.org
On June 1, 2016, at 15:51, Richard Tejera <Saguaroastro(a)cox.net> wrote:
Are there any good SURpasses during the hamfest? I thought the favorable passes are still in the evening?
It's a busy day for me but I may be able to work an early pass.
Rick Tejera K7TEJ
Saguaro Astronomy Club
www.SaguaroAstro.org
Thunderbird Amateur Radio Club
www.w7tbc.org
On June 1, 2016, at 12:14, "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb(a)wd9ewk.net> wrote:
Hi!
I will have an AMSAT table at the White Mountain Hamfest in Show Low,
Arizona, this Saturday, 4 June 2016. The hamfest will be at the Show Low
City Hall parking lot, south of US-60 and west of AZ-260 in the center
of Show Low. This is a half-day hamfest, scheduled to end "noonish"
(around 1900 UTC).
During the hamfest, WD9EWK will be on various satellite passes for on-air
demonstrations of satellite operating. Please call WD9EWK if you hear me,
and be a part of the demonstrations. The hamfest site is in grid DM44.
All QSOs will be uploaded to Logbook of the World after the hamfest, and I
am happy to send QSL cards to anyone who wishes to receive a card. Please
e-mail me the QSO details to get a card. If you're in the log, I will send
a card. No need to first mail a card and/or SASE to get my card in return.
I should be able to post pictures and other updates during the morning to
my @WD9EWK Twitter feed. This is an open feed, which can be viewed in a web
browser at:
http://twitter.com/WD9EWK
if you don't use Twitter. Also, my location should be visible via APRS. I
use WD9EWK-9 as my call sign for APRS, and - among other sites - it should
be visible at:
http://aprs.fi/WD9EWK-9
during my drive to Show Low on Friday evening, as well as at the hamfest
Saturday morning. Other than on ISS passes, I won't leave my APRS radio
squawking once I have parked at the hamfest.
Thanks in advance, and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @WD9EWK
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_______________________________________________
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to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
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Actually, I would tend to suggest the majority of polarization shift is
simply due to the always changing attitude of the spacecraft with respect to
the user.
The fact that all TVRO Satellite dishes worked perfectly well when switching
back and forth from horizontal to vertical polarization when changing
channels and once the dish was initially aligned then those vertical and
horizontal polarizations remained accurate across the entire sky and across
the many dozens of satellites, then would suggest th contribution due to
faraday rotation was small (at C band anyway)...
Yes, there is some faraday rotations at HF and at extremely low elevations,
but I think for one using an ARROW antenna, all of the polarity issues are
simply due to the instantaneous orientation of the satellite. Not the
ionosphere...
But, just my humble opinion...
Bob
WB4APR
-----Original Message-----
From: AMSAT-BB [mailto:[email protected]] On Behalf Of Bob
Sent: Tuesday, May 31, 2016 1:52 PM
To: Doug Andrews
Cc: AMSAT-BB
Subject: Re: [amsat-bb] Polarization
"The antennas I see in the photos of satellites we work are whips. Is the
polarization becoming "circularized" as it re-enters earth's atmosphere or
something?"
Yep, that is exactly what is happening. It is called Faraday Rotation, and
as the signal from the satellite passes through the ionosphere, all sorts of
polarity changes can and do happen. A linear polarized satellite antenna
(horizontal or vertical) can appear to be the opposite or somewhere in
between. That's why folks rotate their Arrow or Elk antennas -- trying to
match the polarity.
Using a circular polarized antenna helps a bunch -- it doesn't matter what
the polarity of the linear satellite antenna happens to be at any moment in
time.
But there is no free lunch -- Even a circular polarized antenna might need
to be switched from Right Hand Circular Polarization (the default) to LHCP
from time to time depending on what nasty thing the ionosphere is doing at
any given moment. Changing the polarity switch might bring a S0 signal up
to S5, a 30 dB improvement. I had that happen to me during a recent ARISS
contact.
73, Bob, WB4SON
On Mon, May 30, 2016 at 8:25 PM, Doug Andrews <dougg27(a)hotmail.com> wrote:
>
>
> I too have wondered about this.
> I have not had much trouble hitting SO-50 and some success on AO-85
> with a
> 5 watt handheld and arrow antenna without turning it. Worth a try.
> DougKG7UNU
>
>
>
> Sent from my Sprint Samsung Galaxy® Note 4.
>
> -------- Original message --------
> From: Ken Alexander <k.alexander(a)rogers.com>
> Date: 5/30/16 4:41 PM (GMT-08:00)
> To: amsat-bb(a)amsat.org
> Subject: [amsat-bb] Polarization
>
> I clipped this from another message because I didn't want to drag the
> discussion off course. It's a question I've been wondering about
> since getting into this a few short weeks ago.
>
> I've also read (but haven't tried yet) about the trick of rotating the
> antenna 90 degrees on transmit, once you've established the best
> receive orientation.
>
> 73 de Bill, KG5FQX
>
> So far, with SO-20 I have rotated my Arrow antenna for best reception
> of the downlink and don't think I've had too much trouble being heard.
> At the same time I have wondered whether I should twist the antenna
> when transmitting to orient the 2m elements to give the same
> polarization as in receive. I don't know if this is a good idea or
> not, and frankly I have enough trouble remembering calls and grids,
> tracking the satellite, adjusting frequency and switching back to the
> correct VFO to worry about one more thing.
>
> I've seen that some commercial OSCAR antennas use circular polarization.
> The antennas I see in the photos of satellites we work are whips. Is
> the polarization becoming "circularized" as it re-enters earth's
> atmosphere or something?
>
> Comments and observations would be most welcome!
>
> 73,
>
> Ken Alexander
> VE3HLS, FN03
>
> _______________________________________________
> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed are solely those of the author, and do not reflect
> the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed are solely those of the author, and do not reflect
> the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
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interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Martha is back from vacation and Dayton. The store has been updated.
There are very limited quantities of the new Golf Shirt, T-Shirt and
Hats. There are 18 LVB Trackers available. If you were looking for one,
this is your opportunity.
We also put 30 copies of the newest 2016 Getting Started in Satellites
on the shelf ready for you to order. This new edition has more pages,
printed in color and spiral bound for easier reading and leaving a page
open while you do something.
73...bruce
--
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
AMSAT Board Alternate 2015-2016
ARRL Awards Field Checker (WAS, 5BWAS, VUCC), VE
Houston AMSAT Net - Wed 0100z on Echolink - Conference *AMSAT*
Also live streaming MP3 at http://www.amsatnet.com
Podcast at http://www.amsatnet.com/podcast.xml or iTunes
Latest satellite news on the ARRL Audio News
http://www.arrl.org
AMSAT on Twitter http://www.twitter.com/amsat
Hi!
After the White Mountain Hamfest wraps up on Saturday in Show Low, Arizona,
I plan on making a long drive around northern Arizona before returning home
on Sunday afternoon or evening. I have some of the trip planned out, and
had asked for some suggestions or comments from those who follow my @WD9EWK
Twitter feed. Looking for more suggestions/comments, I'm also posting here.
In the early afternoon, I am planning to drive from Show Low to Petrified
Forest National Park, along the I-40 freeway in eastern Arizona. This is in
grid DM55. I hope to make contacts from here with at least 10 different
stations to have this visit considered an official activation for the
ARRL's National Parks on the Air activity. Depending on how long I spend at
Petrified Forest, I might drive through the park to the south end of the
park in grid DM54, or possibly try to park on the DM54/DM55 grid boundary
inside the park.
After Petrified Forest, if there is still daylight, I hope to make a stop
at a different point on the DM54/DM55 grid boundary, a few miles/km west of
Petrified Forest along I-40 and old US-66. Then to Flagstaff for the night.
Again, depending on the time and available satellite passes, I may try to
get on from Flagstaff, which is in grid DM45.
Sunday morning and early afternoon is, so far, open. I have a few options
for that time...
1. Drive west of Flagstaff approximately 25 miles/40km to the DM35/DM45
grid boundary. This would be along old US-66, north of I-40 in the Kaibab
National Forest. Keep in mind that national forests are not part of the
National Parks on the Air activity, but this could be a chance for these
two grids to be put on the air.
2. Work from various NPOTA sites around Flagstaff. These sites are in grid
DM45, and include the Sunset Crater Volcano National Monument and Wupatki
National Monument north of Flagstaff, and the Walnut Canyon National
Monument east of Flagstaff. The two sites north of Flagstaff are close
enough where I could operate from both of them, and possibly make enough
QSOs to have two official NPOTA activations.
3. Work from Grand Canyon National Park, about 90 minutes northwest of
Flagstaff. The main park entrance from the south straddles the DM35/DM36
grid boundary, but is not a good place to park and operate. I could park
at different locations to put DM36 and DM46 on the air, but probably not
from the DM36/DM46 grid boundary which starts just inside the canyon - not
a safe place to go at that point. Between locations in DM36 and DM46, I
think I would be able to make enough QSOs with different stations to make
this an official NPOTA activation, as well as hand out QSOs with each of
these two grids. I have not operated from the Grand Canyon in many years,
but I know KL7R operated from the Grand Canyon earlier this year.
Depending on the time spent in northern Arizona on Sunday, I could also
stop at the Montezuma Castle National Monument, along the I-17 freeway
between Phoenix and Flagstaff. This site is in grid DM44, the same grid
I will operate from during the White Mountain Hamfest in Show Low on
Saturday morning, except I will be on the western edge of DM44 compared
to Show Low being on the eastern edge of the same grid.
Since I will be at a hamfest in Prescott AZ on 11 June, located in grid
DM34, I'm not worrying about trying to operate from that grid this weekend.
I will have a whole day for that coming up. I'll post more about that
hamfest next week.
Comments? I suppose this can be discussed here on the AMSAT-BB, or feel
free to e-mail me directly with any thoughts on these plans for Sunday.
You could also tweet at my @WD9EWK Twitter handle, if you use Twitter.
I will use Twitter to post updates on Saturday afternoon and Sunday while
I am on the road. If you don't use Twitter, you can follow my postings at:
http://twitter.com/WD9EWK
I will also use my TH-D72A on APRS as I drive around, with the call sign
WD9EWK-9. This should be visible at (among other sites):
http://aprs.fi/WD9EWK-9
Other than possibly parts of I-40 between Flagstaff and Petrified Forest
National Park on the high desert of northern Arizona, APRS coverage is
generally pretty good. In the absence of APRS coverage, I may periodically
tweet photos of a GPS receiver's display to show my location.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @WD9EWK
Hi!
I will have an AMSAT table at the White Mountain Hamfest in Show Low,
Arizona, this Saturday, 4 June 2016. The hamfest will be at the Show Low
City Hall parking lot, south of US-60 and west of AZ-260 in the center
of Show Low. This is a half-day hamfest, scheduled to end "noonish"
(around 1900 UTC).
During the hamfest, WD9EWK will be on various satellite passes for on-air
demonstrations of satellite operating. Please call WD9EWK if you hear me,
and be a part of the demonstrations. The hamfest site is in grid DM44.
All QSOs will be uploaded to Logbook of the World after the hamfest, and I
am happy to send QSL cards to anyone who wishes to receive a card. Please
e-mail me the QSO details to get a card. If you're in the log, I will send
a card. No need to first mail a card and/or SASE to get my card in return.
I should be able to post pictures and other updates during the morning to
my @WD9EWK Twitter feed. This is an open feed, which can be viewed in a web
browser at:
http://twitter.com/WD9EWK
if you don't use Twitter. Also, my location should be visible via APRS. I
use WD9EWK-9 as my call sign for APRS, and - among other sites - it should
be visible at:
http://aprs.fi/WD9EWK-9
during my drive to Show Low on Friday evening, as well as at the hamfest
Saturday morning. Other than on ISS passes, I won't leave my APRS radio
squawking once I have parked at the hamfest.
Thanks in advance, and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @WD9EWK