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CX2SA > SATDIG 21.04.11 17:05l 846 Lines 24310 Bytes #999 (0) @ WW
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Sent: 110421/1459Z @:CX2SA.LAV.URY.SA #:837 [Minas] FBB7.00e $:AMSATBB6231
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. 51 on, then off again (Andrew Glasbrenner)
2. Re: 51 on, then off again (CA3SOC Raul Romero)
3. Re: 51 on, then off again (Ted)
4. Re: 51 on, then off again (Andrew Glasbrenner)
5. Fwd: ARLS006 Transatlantic Amateur Radio Balloon Launch
(Stuart Balanger)
6. Re: HF Satellite Experiment? (hi Z) (i8cvs)
7. Element Corrosion (Clint Bradford)
8. Re: Element Corrosion (Clint Bradford)
9. Looking for Yaesu azimuth/elevation Rotors (Frank Viggiano)
10. ICOM Giving Away D-Star Repeaters (Clint Bradford)
11. Balloon across Atlantic delayed to 27/29 apr (Bob Bruninga)
12. STS-134 (Bobby Lacey)
13. Re: STS-134 (Tom Williams)
14. AO-51 now requires 67 Hz PL tone; activity reports
appreciated (Mark L. Hammond)
15. CO6CBF from EL92 QRV tomorrow on AO7 mode A
(hmartinez@xxx.xxx.xxx
16. Re: AO-51 now requires 67 Hz PL tone; activity reports
appreciated (Eric Knaps, ON4HF)
17. Re: [ao51-modes] Re: AO-51 now requires 67 Hz PL tone;
activity reports appreciated (Andrew Glasbrenner)
----------------------------------------------------------------------
Message: 1
Date: Wed, 20 Apr 2011 13:06:00 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] 51 on, then off again
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<19826895.1303319160942.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I turned AO-51 back on, and tried to turn the PL system on unsuccessfully
before the end of the pass. Sorry about that, I'll get it on on the next
pass. Get your 67Hz PL tone programmed back in!
73, Drew KO4MA
------------------------------
Message: 2
Date: Wed, 20 Apr 2011 18:08:23 -0300
From: "CA3SOC Raul Romero" <ce3soc@xxxxx.xxx>
Subject: [amsat-bb] Re: 51 on, then off again
To: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>, "amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID: <CD3A0C76DF4C4565A5C53CD54988A32B@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
now here off
send tone 67.0 is off
Raul Romero
9-7190753
ce3soc@xxxxx.xxx
----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Sent: Wednesday, April 20, 2011 2:06 PM
Subject: [amsat-bb] 51 on, then off again
>I turned AO-51 back on, and tried to turn the PL system on unsuccessfully
>before the end of the pass. Sorry about that, I'll get it on on the next
>pass. Get your 67Hz PL tone programmed back in!
>
> 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: 3
Date: Wed, 20 Apr 2011 15:06:43 -0700
From: "Ted" <k7trkradio@xxxxxxx.xxx>
Subject: [amsat-bb] Re: 51 on, then off again
To: "'Andrew Glasbrenner'" <glasbrenner@xxxxxxxxxx.xxx>, "'amsat-bb'"
<amsat-bb@xxxxx.xxx>
Message-ID: <7A46AF569C854D3FAEBC5A83A3381648@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
RU changing the uplink back to the old freq?
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Andrew Glasbrenner
Sent: Wednesday, April 20, 2011 10:06 AM
To: amsat-bb
Subject: [amsat-bb] 51 on, then off again
I turned AO-51 back on, and tried to turn the PL system on unsuccessfully
before the end of the pass. Sorry about that, I'll get it on on the next
pass. Get your 67Hz PL tone programmed back in!
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: 4
Date: Wed, 20 Apr 2011 15:18:36 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: 51 on, then off again
To: Ted <k7trkradio@xxxxxxx.xxx>, "'amsat-bb'" <amsat-bb@xxxxx.xxx>
Message-ID:
<11802921.1303327116744.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
No, I'll let everyone know when we do though.
73, Drew KO4MA
-----Original Message-----
>From: Ted <k7trkradio@xxxxxxx.xxx>
>Sent: Apr 20, 2011 6:06 PM
>To: 'Andrew Glasbrenner' <glasbrenner@xxxxxxxxxx.xxx>, 'amsat-bb'
<amsat-bb@xxxxx.xxx>
>Subject: RE: [amsat-bb] 51 on, then off again
>
>RU changing the uplink back to the old freq?
>
>-----Original Message-----
>From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>Behalf Of Andrew Glasbrenner
>Sent: Wednesday, April 20, 2011 10:06 AM
>To: amsat-bb
>Subject: [amsat-bb] 51 on, then off again
>
>I turned AO-51 back on, and tried to turn the PL system on unsuccessfully
>before the end of the pass. Sorry about that, I'll get it on on the next
>pass. Get your 67Hz PL tone programmed back in!
>
>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: 5
Date: Wed, 20 Apr 2011 18:16:38 -0400
From: Stuart Balanger <wa2bss@xxxxx.xxx>
Subject: [amsat-bb] Fwd: ARLS006 Transatlantic Amateur Radio Balloon
Launch
To: roster@xxxxxx.xxxx members@xxxxxx.xxxx kt2d@xxxx.xxx
Cc: AMSAT-BB@xxxxx.xxx
Message-ID: <BANLkTimrq09W95hDwe6phKzNEHHmf=StNQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
*Hi Guys & Gals, (Note, the top fart is for MBARC
Members; & anyone can read the top part, which
is not private!)
Since I know that some of the new "Hams" are not
ARRL Members, I thoughtthat this would be a perfect
oppertunity to have the "New Hams" join ARRL & MBARC & the club would get
alittle back, when the "New Hams joun both ARRL & MBARC!
The ARRL home page is: www.arrl.org
& MBARC home Page: www.wr2abb.org/home/
Next MBARC "In Person" meeting (5/10); 7PM,
Po'k Gallaria (Community Room), In back of Food Ct.
(On 2nd. floor, & SW Corner of Bldg. (Where City Po'k
& Dut. Co. Loop Buses Stup!)
73,.Stu (WA2BSS;Director)
*
---------- Forwarded message ----------
From: ARRL Web site <memberlist@xxx.xxxx.xxx>
Date: Wed, Apr 20, 2011 at 2:07 PM
Subject: ARLS006 Transatlantic Amateur Radio Balloon Launch
To: wa2bss@xxxxx.xxx
SB SPACE @ ARL $ARLS006
ARLS006 Transatlantic Amateur Radio Balloon Launch
ZCZC AS06
QST de W1AW
Space Bulletin 006 ARLS006
>From ARRL Headquarters
Newington, CT April 20, 2011
To all radio amateurs
SB SPACE ARL ARLS006
ARLS006 Transatlantic Amateur Radio Balloon Launch
The Project Blue Horizon 5 high-altitude transatlantic balloon is
scheduled for launch, weather permitting, at 0400 UTC (midnight
EDST) Friday, April 22, from Oswego, New York. The weather forecast
for launch time calls for clear to partly cloudy conditions.
The Project Blue Horizon team is attempting to break current Amateur
Radio high-altitude balloon records for distance (3361.81 miles) and
duration (49 hours, 45 minutes). The payload will be carried beneath
a 54,000 cubic foot capacity helium-filled balloon cruising between
85,000 and 100,000 feet.
Amateurs worldwide are encouraged to monitor the N2XE CW telemetry
beacons at 7.1023 and 10.1466 MHz. The balloon is also equipped with
an APRS beacon at 144.39 MHz using the call sign KC2ZJH. Amateurs
can send reports via e-mail to PBH15.data@xxxxx.xxx.
More information about the program, including the latest projected
flight path, is at the Project Blue Horizon website at,
http://www.projectbluehorizon.com. Launch and flight updates will
also be available on Twitter at, http://twitter.com/#!/PBH5 .
NNNN
------------------------------
Message: 6
Date: Thu, 21 Apr 2011 02:26:08 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: HF Satellite Experiment? (hi Z)
To: "Bob Bruninga" <bruninga@xxxx.xxx>, "'James Duffey'"
<jamesduffey@xxxxxxx.xxx>
Cc: 'amsat-bb BB' <amsat-bb@xxxxx.xxx>
Message-ID: <000001cbffba$f5da1060$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob, WB4APR
I suggest you to take a look at the succesful 20 MHz and 40 MHz
HF antennas used by SPUTNIK-1
http://www.antenna-theory.com/phpbb2/viewtopic.php?p=451&sid=e909b07b8e95c79
ac9a04a6adec04932
The 58 cm sphere had four antennas, two were 2.4 meters long and
two were 2.9 meters long. They were V shaped turnstile angled at 35
degrees from the longitudinal axis, and two transmitters alternately
emitted 20 or 40 MHz.
Following your proposal a deployed 1000m tether have a very poor
radiation efficiency and will have so much drag and the Cubesat will
de-orbit in only a few days
On the other side the V shaped turnstile are very short and your Cubesat
experiment will not be limited by the drag factor and will last a very long
time .
Also take a look at the HF antennas of OSCAR-6, OSCAR-7, RS-10/11,
RS-12/13, RS-15 and RS-16
73" de
i8CVS Domenico
----- Original Message -----
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'James Duffey'" <jamesduffey@xxxxxxx.xxx>
Cc: "'amsat-bb BB'" <amsat-bb@xxxxx.xxx>
Sent: Wednesday, April 20, 2011 8:41 PM
Subject: [amsat-bb] Re: HF Satellite Experiment? (hi Z)
> Subject: Re: [amsat-bb] HF Satellite Experiment?
>
> > Bob - Calculate the resistance of 1000M of whatever
> > wire you are using at the frequencies you are operating on.
> > It will be low. The resistive component of the impedance
> > will dominate the reactive component, so a simple
> > transformer will do.
>
> Turns out I just learned today that the tether is going to be about 2k
ohms.
> That's 2 ohms per meter or Huge! For the first half wavelength at 7 MHz,
> this is 40 ohms or a nice dummy load...
>
> Putting that into EZNEC changes the antenna from the expected long-wire
cone
> with 14 dBi gain straight down to a nearly perfect Dipole pattern (off the
> sides) with a gain of - 64 dBi and a feed point impedance of 50000
+j36000.
> In other words, only the first 1/2 wave is really doing anything as far as
> pattern.
>
> Again, these are only 1st cut assessments(we haven't really modeled the
> actual cubesat structure yet), but this high resistance of the tether is
> really going to need some looking at...
>
> Bob, WB4APR
>
> > Cubesat HF experiment:
> >
> >
> >
> > We have revised our HF satellite experiment proposal to be a CW
telemetry
> > beacon on 40, 20, 15 and 10 meter bands. The experiment will last only
a
> > few days, since the deployed 1000m tether will have so much drag, we
will
> > de-orbit in only a few days.
> >
> >
> >
> > The idea is a keyed CW oscillator on 7.010 MHz with harmonics on 14.020,
> > 21.030 and 28.040 MHz. These bands are all in the IARU Satelilte
> > allocation. We will filter all harmonics above 28 MHz.
> >
> >
>rough
> > the ionosphere).
> >
> >
> >
> > Launch Opportunity no earlier than March 2012. Putting us closer and
> closer
> > to the Solar Max which would be the worst time for this experiment.
> >
> >
> >
> > Other than a nice AMSAT experiment, if anyone can use this for valid
> > ionosphereic science, come join us.
> >
> >
> >
> > Bob, WB4APR
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > 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
>
> --
> KK6MC
> James Duffey
> Cedar Crest NM
>
>
>
>
>
>
> _______________________________________________
> 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: Wed, 20 Apr 2011 21:33:27 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] Element Corrosion
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <AC58FEEE-4B4F-4604-B5A7-02B7A9D681E1@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
>From my in box this evening - any ideas for this gentleman?
What do you recommend to treat aluminum corrosion? My HyGain 14-AVQ
seems to have problems with that issue even here in dry heat Palm Springs, CA.
I used to recommend cleaning and a liberal slathering of marine spar varnish -
which works for me in Riverside, CA. But what is better for a harsher
environment?
Clint
------------------------------
Message: 8
Date: Wed, 20 Apr 2011 22:20:05 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] Re: Element Corrosion
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <78592835-2468-4E19-ADE9-B9ABA497CCC8@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
THANK YOU all for your immediate and informative replies!
Clint
------------------------------
Message: 9
Date: Wed, 20 Apr 2011 21:46:36 -0700 (PDT)
From: Frank Viggiano <frankviggiano@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Looking for Yaesu azimuth/elevation Rotors
To: amsat-bb@xxxxx.xxx
Message-ID: <751908.60219.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Any one have G5400 or sim rotor 4 sale?73Kb2mvn
------------------------------
Message: 10
Date: Thu, 21 Apr 2011 00:09:04 -0700
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] ICOM Giving Away D-Star Repeaters
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <3E52C1FD-1643-4BA7-8977-8C79DEC51E25@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
http://www.icomamerica.com/en/dstarpromo/
ans-atlantic balloon attempt, PBH-15, has been postponed until next
week due to unfavorable flight predictions and some last minute testing
issues.
They will now be attempting to launch PBH-15 sometime next week (4/27-4/29).
Latest info can always be found on Twitter (@xxxxx or by contacting
<triebwasser@xxxxx.xxx>
Thanks for the help and hope to hear from you next week.
PBH5 Team
---------- Forwarded message ----------
From: Bob Bruninga <bruninga@xxxx.xxx>
Date: Tue, Apr 19, 2011 at 4:22 PM
Subject: Balloon across Atlantic 21 April?
To: Amsat <amsat-bb@xxxxx.xxx>, TAPR APRS Mailing List <aprssig@xxxx.xxx>
Cc: Tom Triebwasser <triebwasser@xxxxx.xxx>, Bob Bruninga <bruninga@xxxx.xxx>
KC2TUA announces: Balloon attempt across the Atlantic. 21 April 2011
Hams in the USA and worldwide are needed to listen on 7.1023 and 10.1466 MHz
and to send readings of the balloon's progress to PBH15.data@xxxxx.xxx. More
information about the program, including the latest projected flight path,
can be found at http://www.projectbluehorizon.com/
https://twitter.com/PBH5.
It also has an APRS GPS tracker on 144.39 with the callsign KC2ZJH and will
launch from Oswego, NY around midnight Thursday. Thanks in advance for your
help!
The HF downlink exact frequency will vary 10 Hz or so with temperature.
Accurate recording of frequency will be useful.
73,
-Tom Triebwasser
PBH Alumnus '09
KC2TUA
---------ad
Call Sign
Primary Voice / Mission Communication
147.500MHz
Technician
Mission Payload HF (40m)
N2XE
Secondary Voice / Mission Communication
Owego Repeater (Duplex)
146.760MHz
Technician
Mission Payload HF (30m)
N2XE
Mission Payload APRS
KC2ZJH
APRS
144.390MHz
Technician
40m HF (Morse Code)
See attached
Technician
30m HF (Morse Code)
See attached
General
Users can input data received from the Mission Payload via the ?User Input?
tab at http://www.projectbluehorizon.com/.
Points received from the PBH-15 payload over HF can also be submitted to:
PBH15.data@xxxxx.xxx
Thanks,
Matthew T. Lewis
------------------------------
Message: 12
Date: Thu, 21 Apr 2011 08:26:12 -0400
From: Bobby Lacey <amsat@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] STS-134
To: amsat-bb@xxxxx.xxx
Message-ID: <BANLkTinZvAvwDrNot8cr6AgLtYh36Ha72w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I will be down at KSC to cover Endeavour's last launch from the press site
next week, and I was just wondering if any hams on the list would be making
the trip down to the cape? The white house announced yesterday that POTUS
will be attending this launch, so security may be interesting.
I'll be tweeting and posting photos of RSS retraction + launch.
http://www.twitter.com/kf4gta
http://www.flickr.com/photos/rllacey
73
Bobby
KF4GTA
------------------------------
Message: 13
Date: Thu, 21 Apr 2011 09:01:29 -0400
From: Tom Williams <tdub20120@xxxxx.xxx>
Subject: [amsat-bb] Re: STS-134
To: Bobby Lacey <amsat@xxxxxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <51123887-5F5F-430D-A6AD-098622FAD203@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
There's a good bunch of hams in the area that cover just about all of the
Cape launches and rebroadcast the countdown nets on a local repeater.
You can get the skinny at http://www.lisats.org/.
I was able to view a shuttle launch a while back from next to the VAB, and
had my little VX-3 tuned to their freq. I was consistently up to date on
holds, issues, and the like.
73s
Tom Williams
KJ4EAW
On Apr 21, 2011, at 8:26 AM, Bobby Lacey <amsat@xxxxxxxxxxx.xxx> wrote:
> I will be down at KSC to cover Endeavour's last launch from the press site
> next week, and I was just wondering if any hams on the list would be making
> the trip down to the cape? The white house announced yesterday that POTUS
> will be attending this launch, so security may be interesting.
>
> I'll be tweeting and posting photos of RSS retraction + launch.
>
> http://www.twitter.com/kf4gta
> http://www.flickr.com/photos/rllacey
>
> 73
> Bobby
> KF4GTA
> _______________________________________________
> 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: Thu, 21 Apr 2011 09:09:04 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] AO-51 now requires 67 Hz PL tone; activity
reports appreciated
To: Amsat - BBS <amsat-bb@xxxxx.xxx>
Cc: ao51-modes@xxxxx.xxx
Message-ID: <BANLkTik5rv632SpUCMXqqwYDWtmgD=5bqg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello AO-51 users,
As you have noticed, AO-51 has recently experienced a few shutdowns
due to a low battery voltage trip. This is because of increasing
eclipses (now at 20 mins per orbit and increasing), poor sun angles
(still getting worse), and a "weak" battery.
We are now using the 67 Hz PL tone required mode in order to turn the
transmitter(s) OFF when not in use. The transmitter power is down to
about 550 mW. We will continue adjusting various parameters,
including transmitter power, trigger voltages, etc. in order to keep
the battery temperatures reasonable. Keep in mind that the power
management feature keeps the transmitter(s) OFF during eclipses, so
you can't bring it up even with a PL tone while the satellite is in
eclipse.
Here is our current schedule, which will continue until further notice:
AO-51 Schedule
Mode V/U FM Voice Repeater (**67 Hz PL tone required**)
Uplink: 145.880 MHz FM (Temporarily from 145.920)
Downlink 435.300 MHz FM
The AO-51 Command Team can use your help!
1-Please make activity reports to: http://oscar.dcarr.org/ This is
very useful to all users. Until everyone knows that the 67 Hz tone
is required, we might see some conflicting reports.
2-Please help spread the word about needing the 67 Hz tone!
73,
--
Mark L. Hammond [N8MH]
------------------------------
Message: 15
Date: Thu, 21 Apr 2011 09:45:38 -0400 (EDT)
From: hmartinez@xxx.xxx.xx
Subject: [amsat-bb] CO6CBF from EL92 QRV tomorrow on AO7 mode A
To: amsat-bb@xxxxx.xxx
Message-ID: <1212.10.14.32.15.1303393538.squirrel@xxxxxx.xxx.xxx.xx>
Content-Type: text/plain; charset="utf-8"
Hello friends
?
?
I will try to be QRV on AO7 in mode (A) tomorrow morning and tomorrow
afternoon
around 29.447 KHz in CW.
?
?
This is a great experiment for me because I will be trying my homemade setup.
Thank you and 73
?
?
Hector, CO6CBF
?
EL92
?
***************************************
Genius is one per cent
inspiration,
and ninety-nine per cent
perspiration.
-- Thomas A.
Edison
***************************************
---
Free the Cuban Five!
http://www.injusticia.cubaweb.cu/, http://www.antiterroristas.cu/
Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana, Cuba.
http://www.congresouniversidad.cu/
Consulte la Enciclopedia Colaborativa Cubana: http://www.ecured.cu/
------------------------------
Message: 16
Date: Thu, 21 Apr 2011 16:17:54 +0200
From: "Eric Knaps, ON4HF" <on4hf@xxxxxxx.xx>
Subject: [amsat-bb] Re: AO-51 now requires 67 Hz PL tone; activity
reports appreciated
Cc: Amsat - BBS <amsat-bb@xxxxx.xxx>, ao51-modes@xxxxx.xxx
Message-ID: <4DB03C92.2080201@xxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello,
Just worked AO-51 without 67Hz tone. I noticed that the carrier drops
out sometimes. I guess you activate the carrier again with subtone but
i'm not sure.
73,
Eric.
Amateur Radio Station ON4HF
Eric Knaps
Satellite manager UBA
Tel. +32472985876 (mobile)
http://www.on4hf.be
Op 21/04/2011 15:09, Mark L. Hammond schreef:
> Hello AO-51 users,
>
> As you have noticed, AO-51 has recently experienced a few shutdowns
> due to a low battery voltage trip. This is because of increasing
> eclipses (now at 20 mins per orbit and increasing), poor sun angles
> (still getting worse), and a "weak" battery.
>
> We are now using the 67 Hz PL tone required mode in order to turn the
> transmitter(s) OFF when not in use. The transmitter power is down to
> about 550 mW. We will continue adjusting various parameters,
> including transmitter power, trigger voltages, etc. in order to keep
> the battery temperatures reasonable. Keep in mind that the power
> mahe AO-51 Command Team can use your help!
>
> 1-Please make activity reports to: http://oscar.dcarr.org/ This is
> very useful to all users. Until everyone knows that the 67 Hz tone
> is required, we might see some conflicting reports.
>
> 2-Please help spread the word about needing the 67 Hz tone!
>
> 73,
>
------------------------------
Message: 17
Date: Thu, 21 Apr 2011 09:32:45 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: [ao51-modes] Re: AO-51 now requires 67 Hz PL
tone; activity reports appreciated
To: "Eric Knaps,ON4HF" <on4hf@xxxxxxx.xx>
Cc: Amsat - BBS <amsat-bb@xxxxx.xxx>, ao51-modes@xxxxx.xxx
Message-ID:
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-----Original Message-----
>From: "Eric Knaps, ON4HF" <on4hf@xxxxxxx.xx>
>
>Hello,
>
>Just worked AO-51 without 67Hz tone. I noticed that the carrier drops
>out sometimes. I guess you activate the carrier again with subtone but
>i'm not sure.
>73,
>Eric.
Thanks Eric. You are correct. In this newer PL scheme, the 67 Hz tone turns
the transmitter on for two minutes, and the uplink receiver is open
squelched. If someone else on the satellite has their tone on and activates
the repeater, you can have a QSO with them in the 2 minute window. The open
squelch also prevents the logjam effect we see on the older PL mode, where
multiple stations may be transmitting simultaneously with none getting
through, and maybe not realizing why.
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
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End of AMSAT-BB Digest, Vol 6, Issue 231
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