| |
CX2SA > SATDIG 07.04.10 11:32l 926 Lines 29255 Bytes #999 (0) @ WW
BID : AMSATBB5153
Read: GUEST
Subj: AMSAT-BB-digest V5 153
Path: IZ3LSV<IK2XDE<DB0RES<ON0AR<F4BWT<F1BBI<CX2SA
Sent: 100407/1028Z @:CX2SA.LAV.URY.SA #:51297 [Minas] FBB7.00e $:AMSATBB5153
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. seeking examples of frequency bands used in amateur
spacecraft (Samudra Haque)
2. Re: BeeSat at 4800 GMSK (PA3GUO)
3. Re: BeeSat at 4800 GMSK (John B. Stephensen)
4. Re: seeking examples of frequency bands used in amateur
spacecraft (Arthur Feller)
5. Re: seeking examples of frequency bands used in
amateurspacecraft (John B. Stephensen)
6. Re: seeking examples of frequency bands used in amateur
spacecraft (Samudra Haque)
7. Re: seeking examples of frequency bands used in
amateurspacecraft (Mark L. Hammond)
8. Re: seeking examples of frequency bands used in amateur
spacecraft (Andrew Glasbrenner)
9. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (Bill Dzurilla)
10. Re: seeking examples of frequency bands used in amateur
spacecraft (Roger Kolakowski)
11. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (Andrew Glasbrenner)
12. Re: seeking examples of frequency bands used in amateur
spacecraft (Andrew Glasbrenner)
13. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (Bob- W7LRD)
14. Re: seeking examples of frequency bands used in amateur
spacecraft (Trevor .)
15. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (davekn4ok@xxx.xxxx
16. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (Nick Pugh K5QXJ)
17. Re: AO-7 Mode C? (Or other reason for varying signal
strength?) (francesco messineo)
----------------------------------------------------------------------
Message: 1
Date: Tue, 6 Apr 2010 15:03:38 -0400
From: Samudra Haque <samudra.haque@xxxxx.xxx>
Subject: [amsat-bb] seeking examples of frequency bands used in
amateur spacecraft
To: Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<j2zd8c724881004061203l69095b53g7bd001d165071564@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello with reference to the US FCC Part 97 and in particular section 97.207
"Space Station" available
http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
Have all of the frequency bands listed below been used in service through
the last four decades?
The following frequency bands and segments are authorized to space stations:
(1) The 17 m, 15 m, 12 m and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm bands;
and
(2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz, 1260-1270
MHz and 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz and
24.00-24.05 GHz segments.
What power limitations are stipulated for these bands?
Samudra, N3RDX & S21X
Alexandria, VA
------------------------------
Message: 2
Date: Tue, 6 Apr 2010 21:07:00 +0200
From: PA3GUO <pa3guo@xxxxxxx.xx>
Subject: [amsat-bb] Re: BeeSat at 4800 GMSK
To: amsat-bb@xxxxx.xxx
Message-ID: <352911.1270580820753.JavaMail.root@xxxxxxxx>
Content-Type: text/plain; charset=utf-8
Hi Nate
May I kindly recommend Mike, DK3WN, website ?
http://www.dk3wn.info/p/ (daily weblog - IMHO the best there is)
http://www.dk3wn.info/satellites.shtml (satellite index)
http://www.dk3wn.info/sat/afu/sat_beesat.shtml (beesat)
MSK is used for AA-U2 as well.
http://www.dk3wn.info/sat/afu/sat_aau.shtml
Mike has a few notes on receiving AA-U2 (also MSK)
Once I participated in a test myself, the SW works.
For this you use a soundcard on the PC, no TNC.
Few items are in German, but Google can translate those for you.
Although, I can read the German quite easy:
Satelliten = satellites
Telemetrie = telemetry
... but that's maybe since I watched German kids TV when I was young
(those were the days TV here in Holland started only at 4pm or so
and I lived 10 km's from the border with Germany....all entirely off-topic !
73, Henk, PA3GUO
--------------------------------
Hi all,
I didn't get a response the last time I asked, so I'll try again, slightly
differently.
What TNC or TNC-like equipment do I need to listen to BeeSat at 4800 bps? I
have a TS-2000, yagi antenna, rotator, and KAM-XL, but the KAM-XL can only
do GMSK at 9600 bps.
Thanks in advance for your time,
Nate KC2SVI
--
Henk, PA3GUO
------------------------------
Message: 3
Date: Tue, 6 Apr 2010 19:17:42 -0000
From: "John B. Stephensen" <kd6ozh@xxxxxxx.xxx>
Subject: [amsat-bb] Re: BeeSat at 4800 GMSK
To: "Nathaniel S. Parsons" <nsp25@xxxxxxx.xxx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Message-ID: <A837DB97186A42A6A03FF7F14EAA2750@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Symek sells modems that can be modified for operation at 4.8-614.4 kbaud
(http://www.symek.com/g/index-g.html).
73,
John
KD6OZH
----- Original Message -----
From: "Nathaniel S. Parsons" <nsp25@xxxxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Sent: Tuesday, April 06, 2010 16:40 UTC
Subject: [amsat-bb] BeeSat at 4800 GMSK
> Hi all,
>
> I didn't get a response the last time I asked, so I'll try again, slightly
> differently.
>
> What TNC or TNC-like equipment do I need to listen to BeeSat at 4800 bps?
> I
> have a TS-2000, yagi antenna, rotator, and KAM-XL, but the KAM-XL can only
> do GMSK at 9600 bps.
>
> Thanks in advance for your time,
>
> Nate KC2SVI
> _______________________________________________
> 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, 06 Apr 2010 18:22:08 -0500 (CDT)
From: Arthur Feller <afeller@xxxxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: samudra.haque@xxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<1120191391.935601.1270596128706.JavaMail.root@xxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hi, Samudra!
The last major change in frequency allocations to the amateur-satellite
service came from the 1979 General World Administrative Radio Conference.
Domestically, the changes became "official" upon the consent of the US Senate.
Suggest reading the paper on "Amateur Satellites" on the IARU web site and
looking at the Annex with the frequency allocations.
AO-40 attempted to use most of the UHF and SHF bands.
No power limit is specified in the RR's. At the same time, the principle of
using the minimum power necessary still applies.
I hope this helps.
73, art.....
W4ART Arlington VA
afeller@xxxx.xxx
Apr 6, 2010 03:21:25 PM, samudra.haque@xxxxx.xxx wrote:
===========================================
Hello with reference to the US FCC Part 97 and in particular section 97.207
"Space Station" available
http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
Have all of the frequency bands listed below been used in service through
the last four decades?
The following frequency bands and segments are authorized to space stations:
(1) The 17 m, 15 m, 12 m and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm bands;
and
(2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz, 1260-1270
MHz and 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz and
24.00-24.05 GHz segments.
What power limitations are stipulated for these bands?
Samudra, N3RDX & S21X
Alexandria, VA
_______________________________________________
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: Wed, 7 Apr 2010 00:09:05 -0000
From: "John B. Stephensen" <kd6ozh@xxxxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateurspacecraft
To: "Samudra Haque" <samudra.haque@xxxxx.xxx>, "Amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID: <FFC5ED6455E6497BAF44D35F122D6F3E@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The RS (radio sputnik) series used the 10 and 15 m bands but no other HF
bands were used as far as I know. Various OSCARs used freqencies between 28
MHz and 47 GHz with the exception of the 3.4 GHz band. 29.3-29.5 MHz,
145.8-146 and 435-438 MHz were generally used but AO-13 and some of the
PACSATs added use of 1260-1270 MHz and 2400-2450 MHz. The rest only appeared
in AO-40.
73,
John
KD6OZH
----- Original Message -----
From: "Samudra Haque" <samudra.haque@xxxxx.xxx>
To: "Amsat-bb" <amsat-bb@xxxxx.xxx>
Sent: Tuesday, April 06, 2010 19:03 UTC
Subject: [amsat-bb] seeking examples of frequency bands used in
amateurspacecraft
> Hello with reference to the US FCC Part 97 and in particular section
> 97.207
> "Space Station" available
> http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
>
> Have all of the frequency bands listed below been used in service through
> the last four decades?
>
> The following frequency bands and segments are authorized to space
> stations:
>
>
>
> (1) The 17 m, 15 m, 12 m and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm
> bands;
> and
>
> (2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz,
> 1260-1270
> MHz and 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz and
> 24.00-24.05 GHz segments.
>
>
>
> What power limitations are stipulated for these bands?
>
>
> Samudra, N3RDX & S21X
> Alexandria, VA
> _______________________________________________
> 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: 6
Date: Tue, 6 Apr 2010 20:16:37 -0400
From: Samudra Haque <samudra.haque@xxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: David Giles <vk5dg@xxxxx.xxx>, Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<i2md8c724881004061716id080d250t2fd56f9bfa630f65@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thank you for the information - I am getting now interested in this area to
research what type of modes were used to communicate and the
observed/reported characteristics of operation in those bands. Might come in
handy when choosing subsystems to fly on future
nano-satellites/pico-satellites.
Thank you also: Arthur and John for your detailed replies.
73
-samudra
On Tue, Apr 6, 2010 at 8:10 PM, David Giles <vk5dg@xxxxx.xxx> wrote:
> Hello Samudra,
> Here's some examples of OSCARS and RS-series that have used the bands (or
> at least flown transmitters/receivers to do so)
> 40m - UO-09
> 20m - UO-09
> 15m - UO-09, RS-12/13
> 10m - plenty including AO-7,AO-51
> 3.4GHz - none to my knowledge
> 5.8GHz - AO-40 receive, P3-E transmit (proposed)
> 10GHz - AO-40 (didn't work)
> 24GHz - AO-40 (heard this one in operation)
>
> Hope this helps.
>
> 73 de David VK5DG
>
>
------------------------------
Message: 7
Date: Tue, 06 Apr 2010 20:24:23 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateurspacecraft
To: "Samudra Haque" <samudra.haque@xxxxx.xxx>, "Amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID: <2QQQ1e00B1e3qRF05QQUkP@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
This webpage is pretty informative....
http://www.amsat.org/amsat-new/satellites/frequencies.php
73,
Mark N8MH
From: "Samudra Haque" <samudra.haque@xxxxx.xxx>
>To: "Amsat-bb" <amsat-bb@xxxxx.xxx>
>Sent: Tuesday, April 06, 2010 19:03 UTC
>Subject: [amsat-bb] seeking examples of frequency bands used in
>amateurspacecraft
>
>
>> Hello with reference to the US FCC Part 97 and in particular section
>> 97.207
>> "Space Station" available
>> http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
>>
>> Have all of the frequency bands listed below been used in service through
>> the last four decades?
>>
>> The following frequency bands and segments are authorized to space
>> stations:
>>
>>
>>
>> (1) The 17 m, 15 m, 12 m and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm
>> bands;
>> and
>>
>> (2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz,
>> 1260-1270
>> MHz and 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz and
>> 24.00-24.05 GHz segments.
>>
>>
>>
>> What power limitations are stipulated for these bands?
>>
>>
>> Samudra, N3RDX & S21X
>> Alexandria, VA
>> _______________________________________________
>> 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
Mark L. Hammond [N8MH]
------------------------------
Message: 8
Date: Tue, 06 Apr 2010 20:26:40 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: Samudra Haque <samudra.haque@xxxxx.xxx>
Cc: Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <4BBBD140.7030307@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Samudra Haque wrote:
> Hello with reference to the US FCC Part 97 and in particular section 97.207
> "Space Station" available
> http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
>
> Have all of the frequency bands listed below been used in service through
> the last four decades?
>
>
http://www.amsat.org/amsat-new/satellites/frequencies.php
73, Drew KO4MA
------------------------------
Message: 9
Date: Tue, 6 Apr 2010 20:07:38 -0700 (PDT)
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: amsat-bb@xxxxx.xxx
Message-ID: <776906.90901.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
So, folks, does anyone have any thoughts or comments about this issue?
73, Bill NZ5N
--- On Sun, 4/4/10, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: AO-7 Mode C? (Or other reason for varying signal strength?)
To: amsat-bb@xxxxx.xxx
Date: Sunday, April 4, 2010, 10:52 PM
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very
low elevation sigs vary significantly on different
passes.? Some mornings I can easily hear my downlink and start working
Europe at 0.7 degrees elevation, while other days I can't hear myself
until 5 degrees elevation, after the window to Europe has closed.? Not
sure if this is due to band conditions, satellite polarization,
obstructions at certain positions, operator error, local noise, or what.
Today I spoke with another experienced AO-7 op and he had an interesting
theory: on the bad days (when I don't hear my downlink until 5 degress), the
sat is in Mode C (lower power).? This seems to make sense, because there
does not seem to be any middle ground -- I start hearing my downlink at
either 0.7 degrees or 5 degrees, never at 2-4 degrees.
Anyone have any thoughts on this?? Are we able to predict when the sat will
be in one mode or another?? Or any other explanation for the signal strength
variations?
73, Bill NZ5N
------------------------------
Message: 10
Date: Tue, 06 Apr 2010 23:38:08 -0400
From: Roger Kolakowski <Rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Cc: Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <4BBBFE20.2080302@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Nice resource...it shows a lot of work went into the table
Roger
WA1KAT
Andrew Glasbrenner wrote:
> Samudra Haque wrote:
>> Hello with reference to the US FCC Part 97 and in particular section 97.207
>> "Space Station" available
>> http://www.arrl.org/FandES/field/regulations/news/part97/c.html#207
>>
>> Have all of the frequency bands listed below been used in service through
>> the last four decades?
>>
>>
> http://www.amsat.org/amsat-new/satellites/frequencies.php
>
> 73, Drew KO4MA
> _______________________________________________
> 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: 11
Date: Tue, 06 Apr 2010 23:41:12 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4BBBFED8.9000701@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
As far as I know the 24 hour timer can only toggle between A and B, not
C. Either way, the power output is likely to be more dependent on the
particular illumination angle and total power generated by the panels
rather than rather it's in B or C. Take antenna polarization and squint
into account too.
Then again, you may be perfectly correct :-)
73, Drew KO4MA
Bill Dzurilla wrote:
> So, folks, does anyone have any thoughts or comments about this issue?
> 73, Bill NZ5N
>
> --- On Sun, 4/4/10, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
>
> From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
> Subject: AO-7 Mode C? (Or other reason for varying signal strength?)
> To: amsat-bb@xxxxx.xxx
> Date: Sunday, April 4, 2010, 10:52 PM
>
> Hi folks,
>
> Since starting my effort to work Europe on AO-7, I've found that the very
low elevation sigs vary significantly on different
> passes. Some mornings I can easily hear my downlink and start working
> Europe at 0.7 degrees elevation, while other days I can't hear myself
> until 5 degrees elevation, after the window to Europe has closed. Not
> sure if this is due to band conditions, satellite polarization,
> obstructions at certain positions, operator error, local noise, or what.
>
> Today I spoke with another experienced AO-7 op and he had an interesting
theory: on the bad days (when I don't hear my downlink until 5 degress), the
sat is in Mode C (lower power). This seems to make sense, because there
does not seem to be any middle ground -- I start hearing my downlink at
either 0.7 degrees or 5 degrees, never at 2-4 degrees.
>
> Anyone have any thoughts on this? Are we able to predict when the sat
will be in one mode or another? Or any other explanation for the signal
strength variations?
>
> 73, Bill NZ5N
>
>
>
>
>
>
>
> _______________________________________________
> 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: Tue, 06 Apr 2010 23:43:56 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: Roger Kolakowski <Rogerkola@xxx.xxx>
Cc: Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <4BBBFF7C.2050201@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Roger Kolakowski wrote:
> Nice resource...it shows a lot of work went into the table
>
> Roger
> WA1KAT
AFAIK it was almost all Emily's work...I've just tweaked and updated it,
with help from bug reports and a few other volunteers. There are many
good resources on amsat.org, and other sites, if one takes the time to
look for, read, and understand them, along with checking the dates and
current sat status!
73, Drew KO4MA
------------------------------
Message: 13
Date: Wed, 7 Apr 2010 06:56:16 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<1374963278.2916571270623376753.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxx
xx.xxx>
Content-Type: text/plain; charset=utf-8
I also have noticed similar events with AO-7.? I try to work into Northern
Europe when the opportunity is there.? As you mentioned, polarization,
obstructions, local noise.? I might add just being a bit temperamental at
being up there for 35 years!? I find it remarkable that we are privileged to
have access to such a marvelous bucket of bolts.
73 Bob W7LRD
Seattle
----- Original Message -----
From: "Bill Dzurilla" <billdz.geo@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Tuesday, April 6, 2010 8:07:38 PM GMT -08:00 US/Canada Pacific
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal
strength?)
So, folks, does anyone have any thoughts or comments about this issue?
73, Bill NZ5N
--- On Sun, 4/4/10, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: AO-7 Mode C? ?(Or other reason for varying signal strength?)
To: amsat-bb@xxxxx.xxx
Date: Sunday, April 4, 2010, 10:52 PM
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very
low elevation sigs vary significantly on different
passes.? Some mornings I can easily hear my downlink and start working
Europe at 0.7 degrees elevation, while other days I can't hear myself
until 5 degrees elevation, after the window to Europe has closed.? Not
sure if this is due to band conditions, satellite polarization,
obstructions at certain positions, operator error, local noise, or what.
Today I spoke with another experienced AO-7 op and he had an interesting
theory: on the bad days (when I don't hear my downlink until 5 degress), the
sat is in Mode C (lower power).? This seems to make sense, because there
does not seem to be any middle ground -- I start hearing my downlink at
either 0.7 degrees or 5 degrees, never at 2-4 degrees.
Anyone have any thoughts on this?? Are we able to predict when the sat will
be in one mode or another?? Or any other explanation for the signal strength
variations?
73, Bill NZ5N
?? ? ?
?? ? ?
_______________________________________________
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: 14
Date: Wed, 7 Apr 2010 08:43:08 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: seeking examples of frequency bands used in
amateur spacecraft
To: Amsat-bb <amsat-bb@xxxxx.xxx>, Roger Kolakowski
<Rogerkola@xxx.xxx>, Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Message-ID: <92822.83728.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
We shouldn't forget that UOSAT 1 (UO-9) carried a set of four phase-related
HF beacons at 7 ,14, 21 and 28MHz to provide a tool for HF propagation
studies through the ionosphere.
73 Trevor M5AKA
------------------------------
Message: 15
Date: Wed, 07 Apr 2010 06:00:29 -0400
From: davekn4ok@xxx.xxx
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: amsat-bb@xxxxx.xxx
Message-ID: <8CCA45049C277ED-1B0C-2D0@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Bill, from my experience it happens when there are lots of high power
signals pulling down the RX.
See ya on the bird,
Dave, kn4ok
-----Original Message-----
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Tue, Apr 6, 2010 9:07 pm
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal
strength?)
So, folks, does anyone have any thoughts or comments about this issue?
3, Bill NZ5N
--- On Sun, 4/4/10, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
ubject: AO-7 Mode C? (Or other reason for varying signal strength?)
o: amsat-bb@xxxxx.xxx
ate: Sunday, April 4, 2010, 10:52 PM
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very low
levation sigs vary significantly on different
asses. Some mornings I can easily hear my downlink and start working
urope at 0.7 degrees elevation, while other days I can't hear myself
ntil 5 degrees elevation, after the window to Europe has closed. Not
ure if this is due to band conditions, satellite polarization,
bstructions at certain positions, operator error, local noise, or what.
Today I spoke with another experienced AO-7 op and he had an interesting
theory:
n the bad days (when I don't hear my downlink until 5 degress), the sat is in
ode C (lower power). This seems to make sense, because there does not seem to
e any middle ground -- I start hearing my downlink at either 0.7 degrees or 5
egrees, never at 2-4 degrees.
Anyone have any thoughts on this? Are we able to predict when the sat will be
n one mode or another? Or any other explanation for the signal strength
ariations?
73, Bill NZ5N
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 16
Date: Wed, 7 Apr 2010 05:11:13 -0500
From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: "'Bill Dzurilla'" <billdz.geo@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <047601cad63a$a7403290$f5c097b0$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
Bill there is ground reflections that can add 6db of enhancement and objects
in the foreground are important considerations.
Nick k5qxj
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bill Dzurilla
Sent: Tuesday, April 06, 2010 10:08 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal
strength?)
So, folks, does anyone have any thoughts or comments about this issue?
73, Bill NZ5N
--- On Sun, 4/4/10, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: AO-7 Mode C? (Or other reason for varying signal strength?)
To: amsat-bb@xxxxx.xxx
Date: Sunday, April 4, 2010, 10:52 PM
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very
low elevation sigs vary significantly on different
passes.? Some mornings I can easily hear my downlink and start working
Europe at 0.7 degrees elevation, while other days I can't hear myself
until 5 degrees elevation, after the window to Europe has closed.? Not
sure if this is due to band conditions, satellite polarization,
obstructions at certain positions, operator error, local noise, or what.
Today I spoke with another experienced AO-7 op and he had an interesting
theory: on the bad days (when I don't hear my downlink until 5 degress), the
sat is in Mode C (lower power).? This seems to make sense, because there
does not seem to be any middle ground -- I start hearing my downlink at
either 0.7 degrees or 5 degrees, never at 2-4 degrees.
Anyone have any thoughts on this?? Are we able to predict when the sat will
be in one mode or another?? Or any other explanation for the signal strength
variations?
73, Bill NZ5N
_______________________________________________
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: 17
Date: Wed, 7 Apr 2010 12:15:02 +0200
From: francesco messineo <francesco.messineo@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying
signal strength?)
To: "davekn4ok@xxx.xxxx <davekn4ok@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<u2sd9f2bc21004070315jb03c60d9j13fbf1db58adb80c@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi all,
On 4/7/10, davekn4ok@xxx.xxx <davekn4ok@xxx.xxx> wrote:
>
>
> Bill, from my experience it happens when there are lots of high power
signals pulling down the RX.
>
this is the same experience I have. When the bird is over Africa with
no stations or max one station calling in the whole passband, I can
hear my own signal usually down to 2 degrees elevation and that's with
2 x lindenblad antennas.
As soon as two or more stations with high power start uplinking, my
little signal disappears.
73
IS0/IZ8DWF
------------------------------
_______________________________________________
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 153
****************************************
Read previous mail | Read next mail
| |
