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CX2SA > SATDIG 07.12.09 12:57l 936 Lines 31809 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Successful G-5500 AZ repair (Mark L. Hammond)
2. SO-67 recordings North America 05-06Dec2009 (John Papay)
3. AO-51 - After the Change (Clint Bradford)
4. Help with SO-67 and Nova (Gopal Madhavan)
5. Re: AO-51 - After the Change (Jean-Fran?ois M?nard)
6. Re: AO-51 - After the Change (Glenn AA5PK)
7. Re: AO-51 - After the Change (Clint Bradford)
8. Re: Help with SO-67 and Nova (Mani VU2WMY)
9. WD9EWK at the Superstition hamfest (Mesa AZ) and DM32/DM42 on
Saturday (Patrick STODDARD (WD9EWK/VA7EWK))
10. Fade compensation (Robert Smith)
11. Re: AO-51 - After the Change (w6zkh@xxxxxxx.xxxx
12. Re: AO-51 - After the Change (Art McBride)
13. (no subject) (Pierre van Deventer)
14. Re: AO-51 - After the Change (Clint Bradford)
15. SO-67 0858_07-12-2009 (Mateusz)
16. SO-67 contacts (Ulip ?eljko)
----------------------------------------------------------------------
Message: 1
Date: Sun, 06 Dec 2009 15:53:15 -0500
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Successful G-5500 AZ repair
To: amsat-bb@xxxxx.xxx
Message-ID: <4b1c19b2.9453f10a.0828.fffff3da@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi All,
In recent weeks I asked about the AZ resistor pot for my G-5500. The unit
is 9 years old. The observation was a "bad spot" that appeared to be in the
area of 150-220 degs. But it was sporadic...not the same all the time. I
suspected a worn spot on the wire contact of the resistor pot...I was wrong!
This weekend I opened it up (azimuth) and was "pleased" to see that the
"only" problem was a broken black wire that runs from the center/back of the
pot to the middle contact/red wire. Such a simple problem that makes your
$600 rotor system basically worthless! The wire contacts in the pot looked
like new.
At first glance I didn't even realize the wire was supposed to be connected
to anything, since the break was so clean.
Thanks to KD4APP for posting the a picture of his setup:
http://www.sunsunsun.net/kd4app/amsat/g5500.htm
and
http://www.sunsunsun.net/kd4app/images/g5500-pot.JPG
After I soldered the black wire, I put some electrical tape around the pot
to give some strain relief to the wire.
It was amazingly clean inside, but North Carolina weather is pretty decent
year round. Of course I cleaned/regreased the bearings (I should have used
a bucket as suggested by Alan WA4SCA :) ) with some marine trailer bearing
grease; it's thick and sticky enough to help hold them onto the races during
reassembly. Only the "bottom" bearings showed any rust, and it was light.
A rub with a rag and they were clean.
Hint for next time--do NOT stop the unit at 0 deg AZ before taking it apart.
Rather, use 90 or 180 or 360 deg (since the unit does 450 deg, avoid 0 and
450). You'll want to avoid the "end stops" since the little lever gets in
the way and won't let you put it back together quite right...
In the end, a satisfying repair.
73,
Mark L. Hammond [N8MH]
------------------------------
Message: 2
Date: Sun, 06 Dec 2009 16:44:46 -0500
From: John Papay <john@xxxxxx.xxx>
Subject: [amsat-bb] SO-67 recordings North America 05-06Dec2009
To: amsat-bb@xxxxx.xxx
Message-ID: <149641.77940.qm@xxxxxxx.xxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
The SO-67 recordings from 05 and 06 December are
on my webserver:
http://www.papays.com/SO-67_05Dec2009_125403z.mp3
This pass was only 1 degree so it is short. But you can
get an idea of how strong this satellite is, even at low
elevations. East is not a good direction for me but SO-67
burns its way through the trees.
http://www.papays.com/SO-67_05Dec2009_142508z.mp3
This is a 54 degree pass. The time stamp on the audio files
are not necessarily the beginning of the audio clip. That's
because my recorder turns on at AOS and SO-67 is not turned
on for 1-2 minutes after I can see it. Therefore I have
deleted the beginning of the audio file because it only contains
noise.
http://www.papays.com/SO-67_05Dec2009_155930z.mp3
This was a 10 degree western pass for me.
http://www.papays.com/SO-67_06Dec2009_140452z.mp3
This was a 28 degree eastern pass for me.
http://www.papays.com/SO-67_06Dec2009_153840z.mp3
This was a 17 degree western pass for me. I was not
at home during this pass.
SO-67 continues to be difficult to work for some because
of not adjusting for the particular operating parameters
of this bird, especially the 3 second tail timer. Once
you learn to take this into account, the bird is easier to
work. Full duplex makes it much easier to work this bird
since you can determine when you are in or out. You can
hear an example by listening to VE2DWE. He transmits during
the tail, but since he is full duplex he knows when the
transmitter goes off and he unkeys and then keys and continues
with his exchange.
SO-67 is in virtually continuous use when over North America.
If it is possible to change the way it operates, it would be
best for it to have the transmitter on continuously over
North America (based on a schedule) with no "tail," similar
to how AO-27 operates. It would not stress the transmitter
as much since it would not be constantly going on and off.
I have included another audio file taken from AO-27, 6December2009
at 2031z. AO-27 is on for 7 minutes over North America with the
transmitter on continuously, no CTCSS required for access. If
you work this bird it pays to watch the clock to see when the end
of the pass is eminent. I use a software timer and start it when
the data goes off at the beginning of the pass. If someone calls
you at the end of the 7 minute period, you know how long you have
to respond. No sense in being surprised.
http://www.papays.com/AO-27_06Dec2009_203103z.mp3
73,
John K8YSE EN91dh
------------------------------
Message: 3
Date: Sun, 6 Dec 2009 17:59:34 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 - After the Change
To: amsat-bb@xxxxx.xxx
Message-ID: <F47B22E6-1E2C-4AE3-B67A-117D5F63CF52@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I thought I read we were supposed to experience degraded performance
from AO-51 since last week's re-orientation of the bird.
I just worked the 5:04PM Pacific Standard Time / 01:04 GMT pass from
DM03. Worked three countries along the West Coast, in addition to
working Texas to the East. Elaborate station equipment involved ...
-handheld radio at 2.0W
-handheld dual-band Yagi
Performance seems just fine out here, folks!
Clint Bradford, K6LCS
http://www.work-sat.com
------------------------------
Message: 4
Date: Mon, 7 Dec 2009 08:13:19 +0530
From: "Gopal Madhavan" <gopal.madhavan@xxxxx.xxx>
Subject: [amsat-bb] Help with SO-67 and Nova
To: <amsat-bb@xxxxx.xxx>
Message-ID: <4b1c6bcc.8602be0a.6360.ffffff6d@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I am unable to see SO-67 listed amongst the satellites for the Nova tracking
program. Can anyone help and let me know how I can add this satellite to the
list?
Gopal VU2GMN
Gopal Madhavan
"Shreyas Apartments"
128 (old 63) Greenways Road
R A Puram
Chennai- 600 028, India
Tel: +91 44 2493 7724/ 42303129
Mob: +91 94440 18452
E-mail: gopal.madhavan@xxxxx.xxx
------------------------------
Message: 5
Date: Sun, 6 Dec 2009 21:45:59 -0500
From: Jean-Fran?ois M?nard <jf.va2ss@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 - After the Change
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<b6cfdc060912061845v72946046ge558bd164826a8a6@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I tried again tonight on a 30 deg pass... no luck for me... Eggbeater,
preamp, heliax.... gee ! It is really different !
73
2009/12/6 Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>:
> I thought I read we were supposed to experience degraded performance
> from AO-51 since last week's re-orientation of the bird.
>
> I just worked the 5:04PM Pacific Standard Time / 01:04 GMT pass from
> DM03. Worked three countries along the West Coast, in addition to
> working Texas to the East. Elaborate station equipment involved ...
>
> -handheld radio at 2.0W
> -handheld dual-band Yagi
>
> Performance seems just fine out here, folks!
>
> Clint Bradford, K6LCS
> http://www.work-sat.com
> _______________________________________________
> 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
>
--
Jean-Fran?ois M?nard
VA2SS
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
AMSAT www.amsat.org / Member #37102
ARRL www.arrl.org
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
------------------------------
Message: 6
Date: Sun, 6 Dec 2009 21:02:49 -0600
From: "Glenn AA5PK" <aa5pk@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 - After the Change
To: <amsat-bb@xxxxx.xxx>
Cc: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Message-ID: <8D72633BED31495ABB2CFE5760323C0F@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I think the handheld ops have less trouble with the polarity switching
because tend to compensate more quickly with a twist
of the wrist.
At higher elevations, the fades are hardly noticeable here. At low
elevations, the drop outs are similar to SO-50. It makes
me wish I did have polarity switching.
73
Glenn AA5PK
DM91 - San Angelo, TX
----- Original Message -----
From: "Clint Bradford" <clintbrad4d@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Sunday, December 06, 2009 7:59 PM
Subject: [amsat-bb] AO-51 - After the Change
>I thought I read we were supposed to experience degraded performance
> from AO-51 since last week's re-orientation of the bird.
>
> I just worked the 5:04PM Pacific Standard Time / 01:04 GMT pass from
> DM03. Worked three countries along the West Coast, in addition to
> working Texas to the East. Elaborate station equipment involved ...
>
> -handheld radio at 2.0W
> -handheld dual-band Yagi
>
> Performance seems just fine out here, folks!
>
> Clint Bradford, K6LCS
> http://www.work-sat.com
> _______________________________________________
> 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: 7
Date: Sun, 6 Dec 2009 19:15:19 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 - After the Change
To: "Glenn AA5PK" <aa5pk@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <E057015A-FC1E-40FC-B6DE-25C7367A071E@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>> ... I think the handheld ops have less trouble with the polarity
switching because tend to compensate more quickly with a twist of the
wrist ...
That phenomenon is not evident now - nor has it ever been - for me on
AO-51.
I know the engineers say I am supposed to be increasing or decreasing
my signal strength by 22 or 23db by merely twisting my Yagi 90
degrees. But I have hundreds of witnesses during dozens of
demonstrations who will tell you that when the Yagi is turned 90
degrees, there's no discernible change in the signal.
This is not a scientific approach to the subject, of course. Just what
my aging ears can hear.
I have heard fellow AMSAT members describe AO-51's "signal fading due
to the satellite tumbling in space," too. I am not using elaborate
equipment, but have no idea what they are talking about.
Just my firsthand observations. Guess I could be wrong ... we are a
little different - I am told - out hre on the West Coast of the US.
Clint Bradford, K6LCS
------------------------------
Message: 8
Date: Mon, 07 Dec 2009 08:51:35 +0530
From: Mani VU2WMY <wmy@xxxx.xxx.xx>
Subject: [amsat-bb] Re: Help with SO-67 and Nova
To: amsat-bb@xxxxx.xxx
Message-ID: <20091207085135.10083sx8hxw1mxmn@xxxxxxxx.xxxx.xxx.xxx.xx>
Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed"
Hi Gopal,
It is very much there in the "celestrack TLE" under the group
"Amateur" as "SUMBANDILA (SO-67)". When you update your Nova TLE with
latest "amateur" file, you should able to find it on you Nova data
base.
Update can be done either manually or auto update through net. Down
load the latest keps and just click auto update.
73 de
Mani VU2WMY
Quoting Gopal Madhavan <gopal.madhavan@xxxxx.xxx>:
> I am unable to see SO-67 listed amongst the satellites for the Nova tracking
> program. Can anyone help and let me know how I can add this satellite to the
> list?
>
>
>
> Gopal VU2GMN
>
>
>
> Gopal Madhavan
>
> "Shreyas Apartments"
>
> 128 (old 63) Greenways Road
>
> R A Puram
>
> Chennai- 600 028, India
>
> Tel: +91 44 2493 7724/ 42303129
>
> Mob: +91 94440 18452
>
> E-mail: gopal.madhavan@xxxxx.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
>
Mani, VU2WMY
Secretary & Station-In-Charge
Upagrah Amateur Radio Club VU2URC
ISRO Satellite Centre
Airport Road, Bangalore-560 017.
Phone:(O)91-80-2508 2054/2192/2537
Mobile: 91-80-98803 41456
E-mail ID: wmy@xxxx.xxx.xx
vu2wmy_mani@xxxxx.xxx
isrohams@xxxxx.xxx
------------------------------
Message: 9
Date: Sun, 6 Dec 2009 20:34:32 -0800 (PST)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] WD9EWK at the Superstition hamfest (Mesa AZ) and
DM32/DM42 on Saturday
To: amsat-bb@xxxxx.xxx
Message-ID: <652278.82578.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
More fun on the satellites yesterday. Between the Superstition Amateur
Radio Club's annual hamfest and a quick afternoon/evening road trip
south of Phoenix to an unusual grid, it was a good day. Lots of
interested people at the hamfest, and lots of QSOs for those hoping
to work the rarely-heard grid DM32 later in the day.
Superstition Amateur Radio Club hamfest, at Mesa Community College in
Mesa, Arizona (grid DM43bj)
This hamfest is the first one of the Phoenix-area hamfest "season", as
the weather turns cooler and the winter visitors - "snowbirds" - from
other colder parts of North America make their way back to central and
southern Arizona. When I showed up at the hamfest around 0515 local
time (1215 UTC), there were already more people setting up than in the
past couple of years. Good weather also helps with that, of course.
Although cool by local standards (36F/2C at that hour), no rain was seen.
I set up my AMSAT table, and prepared for the first of 6 passes I would
use for on-air demonstrations.
The first two passes of the morning, at 1254 and 1434 UTC, were on
AO-51. These were the first passes I worked since the satellite was
flipped around and its antennas were not favoring the Northern
Hemisphere. Once the satellite was up from the horizon, there was
little noticeable difference compared to previous passes. Near the
horizon, it was tougher to hear - but not impossible. As usual, there
were lots of stations on the pass toward the east. I was able to make
8 contacts with stations across the USA and in southern Mexico. One of
those QSOs was with Bob WA7DXZ, who let me know he would be coming to
the hamfest in a couple of hours. He showed up as promised, stopping
by to say "hello" a couple of hours after we made that QSO. The second
pass to the west had fewer stations on, and only 3 QSOs went in the log.
The next pass I planned to try for a demonstration was on AO-7. It was
in mode B at 1448-1510 UTC, coming almost directly over my head (81
degrees maximum elevation). This was the first time I attempted a
demonstration using this satellite. Unfortunately, I had some local
QRM to deal with on the SSB downlinks - generators with lots of noise
audible on my receiver (one of my FT-817NDs). Thankfully, the noisy
generators were north of me, and pointing my antenna away from that
direction reduced the noise. Thanks to AA5PK, KC7MG (he was not too
far away from me, in Casa Grande south of the hamfest site), WC7V, and
XE1AO for the SSB QSOs. In fact, XE1AO said that his QSO with me was
his first on AO-7. Maybe we'll hear more activity from Mexico on that
satellite in the near future.
Later in the morning, I had two VO-52 passes and an SO-50 pass where I
had demonstrations. Again, I made contacts with 4 stations on the first
VO-52 pass to the east at 1618-1630 UTC, and two on the western pass at
1754-1806 UTC. In between these two passes was the SO-50 pass I worked
at 1730-1742 UTC, with 6 QSOs.
When I wasn't on the radio, I had a steady stream of traffic around the
AMSAT table. All of the demonstrations draw nice crowds, and the AO-7
demonstration in particular brought out the largest crowd. The longer
pass time meant people stuck around longer, including many who had been
on the satellites in the past. Some of those were active on AO-7 in the
70s and early 80s during its first life. I apologize to those who were
waiting for me on passes where I didn't show up until 3 or 4 minutes into
the pass, as I was chatting with people around the table and I was not
watching the clock closely.
This hamfest also turned out to be a nice get-together for satellite
operators currently active on satellites. A nice roundup:
Bob WA7DXZ
Ed N7EDK
John N7JK
Larry WA6DIR
Leo W7JPI
Larry drove in from California, Ed and Leo came up from southern Arizona,
and Bob and John live in the Phoenix area. A nice get-together for those
of us that get on from the southwestern USA. Many others who are
occasionally on also stopped by throughout the morning, including a
couple from northern Mexico.
Thanks to the Superstition Amateur Radio Club for providing me a space
for AMSAT at the hamfest, and all of the stations across North America
that made contacts with WD9EWK during the demonstrations. But this would
not be the end of my day on the satellites...
Southeast of Maricopa, Arizona, in Pinal County (grids DM32xx and DM42ax)
32 59.960 N 112 0.000 W
A few days before the hamfest, I mentioned I would also make a trip to the
rarely-heard grid DM32 in the afternoon after the hamfest. Less than 45
minutes away from the hamfest is the northeast corner of DM32, a grid that
has no resident satellite operators and most of it is off-limits due to an
Air Force bombing range and several wilderness areas in the grid. The
southwest corner of the grid crosses into northern Mexico. I have gone to
this area on many occasions in the last couple of years, putting both of
these grids on the air for satellite operators.
The location on the boundary that I use is very close to where four grids
(DM32, DM33, DM42, DM43) converge - in the middle of a farm. I do not go
onto that spot, but park on this boundary on the side of a road to work
from both DM32 and DM42. I drove here after most people had left the
hamfest around 2000 UTC, an hour before the first of two AO-27 passes I
hoped to work at this location.
I arrived with 10 minutes to spare. I set up my radio, the antenna was
already assembled from earlier, and I was ready for the 7 minutes of AO-27
repeater time. In 7 minutes, 12 QSOs were logged with stations all over
the USA and Canada - including QSOs with several who had previously told
me that they hoped to work DM32. The western AO-27 pass at 2240-2247 UTC
had 4 more QSOs, including a QSO with Craig KL4E doing a demonstration for
a Boy Scout group in Anchorage, Alaska.
Later on, there were two AO-51 passes - 0004-0018 and 0144-0156 UTC. The
first pass to the easy was a popular pass, with 14 QSOs from all over the
continental USA and Alaska (KL4E was on doing another demonstration for
that Boy Scout group in Anchorage). The later pass wasn't as busy, but
still put 8 more QSOs in the log with stations along the US west coast and
in Alaska (KL4E again; this time he was at home). A total of 38 QSOs were
logged on these 4 passes.
Compared to many of my other road trips, this one was a very short trip.
I drove less than 100 miles/160km for the day. There was no shortage of
activity on all of these passes, 10 in total. Anyone who worked WD9EWK
yesterday and wants a QSL card only needs to e-mail me the QSO details.
If you're in the log, I will mail you the card(s). No SASE required.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 10
Date: Sun, 6 Dec 2009 19:01:48 -1000
From: "Robert Smith" <dukenuke@xxxx.xxx>
Subject: [amsat-bb] Fade compensation
To: "Amsat-Bb@xxxxx. Org" <amsat-bb@xxxxx.xxx>
Message-ID: <FA66ADFA3ABD402DAB4F5E50A29A6285@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Aloha All
Just a note on my personal Arrow experience.
With many satellites, ie, AO-51, SO-50,
Cubesats Prism, SEEDS, etc., I have found
that a "twist" of the wrist" can make the
difference between a "clean" signal and no
signal at all! This is a common phenomena
that I experienced less than 2 hours ago
on AO-51. The AO-51 pass was noisy
at 14 degs max. el. using my Arrow and HT.
Antenna "adjustment" helped significantly.
Having only been on 51 a handfull of times
during the past week I cannot pass any
judgment regarding recent downlinks in Hawaii.
My impression is that AO-51 is a very
dependable, fantastic FM bird. The same
goes for it's Operations team and those I
regularly hear on the mainland. Tonite's
"noise" may be been an anomoly or perhaps
the current orientation of AO-51 has shifted
some signal strength in favor of the southern
hemisphere. I did did have several clear
QSOs. I will continue to evaluate AO-51's
signal quality.
73 to everybody
Respectfully- robert, NH7WN
Honolulu, Hawaii
------------------------------
Message: 11
Date: Mon, 7 Dec 2009 05:19:54 +0000 (UTC)
From: w6zkh@xxxxxxx.xxx
Subject: [amsat-bb] Re: AO-51 - After the Change
To: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<1378993024.2795071260163194149.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
I experience this drastic polarity changing here ever since the change, and
like SO-50, have to keep one finger on the polarity switch.........maybe my
aging ears arent as good as my aging KLM's? Will be glad when they can
reverse what they did afew weeks back. Also I notice the signal is not as
strong now, as instead of picking up the bird at 1-2 degs above horizon, it
is now 6-8 degrees.
John W6ZKH
on the Left Coast of the Sierras
----- Original Message -----
From: "Clint Bradford" <clintbrad4d@xxxxxxxxx.xxx>
To: "Glenn AA5PK" <aa5pk@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Sent: Sunday, December 6, 2009 7:15:19 PM GMT -08:00 US/Canada Pacific
Subject: [amsat-bb] Re: AO-51 - After the Change
>> ... I think the handheld ops have less trouble with the polarity
switching because tend to compensate more quickly with a twist of the
wrist ...
That phenomenon is not evident now - nor has it ever been - for me on
AO-51.
I know the engineers say I am supposed to be increasing or decreasing
my signal strength by 22 or 23db by merely twisting my Yagi 90
degrees. But I have hundreds of witnesses during dozens of
demonstrations who will tell you that when the Yagi is turned 90
degrees, there's no discernible change in the signal.
This is not a scientific approach to the subject, of course. Just what
my aging ears can hear.
I have heard fellow AMSAT members describe AO-51's "signal fading due
to the satellite tumbling in space," too. I am not using elaborate
equipment, but have no idea what they are talking about.
Just my firsthand observations. Guess I could be wrong ... we are a
little different - I am told - out hre on the West Coast of the US.
Clint Bradford, K6LCS
_______________________________________________
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: 12
Date: Sun, 6 Dec 2009 22:31:05 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: AO-51 - After the Change
To: "'Clint Bradford'" <clintbrad4d@xxxxxxxxx.xxx>, "'Glenn AA5PK'"
<aa5pk@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <360326AC7E944FB3820D3AF180F029FB@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Clint,
Rotating a linear polarized Yagi in a circularly polarized field should
result in less than a few dB of change, no change if the circular antenna is
perfectly circularly polarized. When using a linear antenna ground effects
including reflections will cause a larger change. Using circular on both
ends will result in less fading from the ground effects and no change in
signal for antenna rotation on the S/C side providing the S/C antenna has a
good pointing angle. Losses of 22 +dB are reserved for cross polarization of
antennas H-V and LH to RH.
Art, KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Clint Bradford
Sent: Sunday, December 06, 2009 7:15 PM
To: Glenn AA5PK
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-51 - After the Change
>> ... I think the handheld ops have less trouble with the polarity
switching because tend to compensate more quickly with a twist of the
wrist ...
That phenomenon is not evident now - nor has it ever been - for me on
AO-51.
I know the engineers say I am supposed to be increasing or decreasing
my signal strength by 22 or 23db by merely twisting my Yagi 90
degrees. But I have hundreds of witnesses during dozens of
demonstrations who will tell you that when the Yagi is turned 90
degrees, there's no discernible change in the signal.
This is not a scientific approach to the subject, of course. Just what
my aging ears can hear.
I have heard fellow AMSAT members describe AO-51's "signal fading due
to the satellite tumbling in space," too. I am not using elaborate
equipment, but have no idea what they are talking about.
Just my firsthand observations. Guess I could be wrong ... we are a
little different - I am told - out hre on the West Coast of the US.
Clint Bradford, K6LCS
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------------------------------
Message: 13
Date: Mon, 7 Dec 2009 08:45:06 +0200
From: "Pierre van Deventer" <pierrevd@xxxx.xx.xx>
Subject: [amsat-bb] (no subject)
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <000d01ca7708$d04e3330$70ea9990$@xx.xx>
Content-Type: text/plain; charset="us-ascii"
I have seen this topic being debated on previous occasions.
Each and every time I have used AO51 I experience the same. If one uses a
hand held linear polarized Yagi for the down link the signal difference by
"twisting" the wrist is enormous. I have not made a point of measuring the
difference as such, but the down link signal varies from being full quieting
to virtually inaudible.
This was so before the flip and still so now after the flip.
73, Pierre ZS6BB
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Clint Bradford
Sent: 07 December 2009 05:15
To: Glenn AA5PK
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-51 - After the Change
>> ... I think the handheld ops have less trouble with the polarity
switching because tend to compensate more quickly with a twist of the wrist
...
That phenomenon is not evident now - nor has it ever been - for me on AO-51.
I know the engineers say I am supposed to be increasing or decreasing my
signal strength by 22 or 23db by merely twisting my Yagi 90 degrees. But I
have hundreds of witnesses during dozens of demonstrations who will tell you
that when the Yagi is turned 90 degrees, there's no discernible change in
the signal.
This is not a scientific approach to the subject, of course. Just what my
aging ears can hear.
I have heard fellow AMSAT members describe AO-51's "signal fading due to the
satellite tumbling in space," too. I am not using elaborate equipment, but
have no idea what they are talking about.
Just my firsthand observations. Guess I could be wrong ... we are a little
different - I am told - out hre on the West Coast of the US.
Clint Bradford, K6LCS
------------------------------
Message: 14
Date: Sun, 6 Dec 2009 23:01:54 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 - After the Change
To: <kc6uqh@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4E2ED4EC-D9A1-4550-B1A6-C5ED11276608@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Art - What you wrote (and correct me if I misinterpreted) is that me -
and others with mere handheld Yagi antennas - are achieving better
results on the FM birds than those with more sophisticated linear
antennas.
Clint
On Dec 6, 2009, at 10:31 PM, Art McBride wrote:
Clint,
Rotating a linear polarized Yagi in a circularly polarized field should
result in less than a few dB of change, no change if the circular
antenna is
perfectly circularly polarized. When using a linear antenna ground
effects
including reflections will cause a larger change. Using circular on both
ends will result in less fading from the ground effects and no change in
signal for antenna rotation on the S/C side providing the S/C antenna
has a
good pointing angle. Losses of 22 +dB are reserved for cross
polarization of
antennas H-V and LH to RH.
------------------------------
Message: 15
Date: Mon, 7 Dec 2009 10:35:39 +0100
From: "Mateusz" <sq7dqx@xxxxxx.xxxx.xx>
Subject: [amsat-bb] SO-67 0858_07-12-2009
To: <amsat-bb@xxxxx.xxx>
Message-ID: <A5DCB36AB6764CFD9D0B8E396F9AED4A@xx>
Content-Type: text/plain; format=flowed; charset="iso-8859-2";
reply-type=original
Record from monday morning:
http://www.enduro.idl.pl/audio_sat/so67_europe_mess.mp3
------------------------------
Message: 16
Date: Mon, 7 Dec 2009 11:45:46 +0100
From: Ulip ?eljko <Zeljko.Ulip@xxxxxxxx.xx>
Subject: [amsat-bb] SO-67 contacts
To: <AMSAT-BB@xxxxx.xxx>
Message-ID:
<6CEBA5B9C650B94D8864DEBEE95B3EF201319C44@xxxxxx.xxx.xxxxxxxx.xx>
Content-Type: text/plain; charset="iso-8859-2"
Hello Satellnauts,
After a two orbits of listening and following the SO-67 rules, I made few
contacts without any problem:
05.12.2009. 08.07 UTC: PE1NIL, ON5UE, SP5MG, F1UGK, IV3RVQ and EA5TT
06.12.2009. 07.47 UTC: SP9FPP, YO9GJX, F6BYJ, I6IBE and SQ7DQX
See you on the SO-67!
Best regards & 73
Zeljko 9A2EY
------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 4, Issue 645
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