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CX2SA > SATDIG 27.07.11 15:36l 858 Lines 26782 Bytes #999 (0) @ WW
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Sent: 110727/1329Z @:CX2SA.LAV.URY.SA #:18599 [Minas] FBB7.00e $:AMSATBB6397
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Cubesat NANOSATC-BR (i8cvs)
2. ARISSatTLM Morse Code Decoder Works on HF Also (JoAnne Maenpaa)
3. Re: G5500 Azimuth issue (Peter Portanova)
4. Special Event Station N8M Active on Satellites This Weekend
(JoAnne Maenpaa)
5. Re: G5500 Azimuth issue (Alan P. Biddle)
6. Re: ISS BBS/Message Board (Jeremy Bomkamp)
7. ARISSat-1 Battery Charging (Clint Bradford)
8. FAST2 (Fred VE3FAL)
9. Repair of SSB Preamp/Downconverter (Sion Chow Q. C. (9W2QC))
10. Re: G5500 az el issue resolved! (Jeff KB2M)
11. Solar Flare prediction (Lee Maisel)
12. Full Duplex? (Mike)
13. Re: ISS Message Board, (Nader Omer)
14. Re: Full Duplex? (g0mrf@xxx.xxxx
15. Re: G5500 az el issue resolved! (Stephen E. Belter)
16. Re: G5500 az el issue resolved! (Diane Bruce)
17. Re: Full Duplex? (Lowell White)
18. Re: Full Duplex? (Zachary Beougher)
----------------------------------------------------------------------
Message: 1
Date: Tue, 26 Jul 2011 22:13:20 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Cubesat NANOSATC-BR
To: "ps8rf Piraja" <ps8rf@xxxxxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Message-ID: <000001cc4bd0$b3292280$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: ps8rf Piraja
To: Domenico ; amsat-bb@xxxxx.xxx
Sent: Tuesday, July 26, 2011 4:17 PM
Subject: FW: [amsat-bb] Cubesat NANOSATC-BR
Hi Domenico,
<snip>
When BRASAT (AMSAT - BR) we do not have much information. Some years back
we walk probing information to activate it, but we had no information, only
that the Junior Castro was the holder of the AMSAT-BR. If you observe, the
only ham entity that is supporting the project NANOSATC-BR is the Amateur
Radio Association Santamariense - ASRA, a small local association, but big
in their efforts.
73' Piraj?, PS8RF
Hi Piraja' ,PS8RF
It means that as soon Junior De Castro, PY2BJO abandoned his BRAMSAT
activity with a lot of his personal money and donations than AMSAT Brazil do
not existed anymore.
Same story on the recent events in AMSAT-France.
Because of no HEO satellites in orbit AMSAT is loosing every day his power
and many old members.
Sorry to say that.
73" de
i8CVS Domenico
> From: domenico.i8cvs@xxx.xx
> To: ps8rf@xxxxxxx.xxxx amsat-bb@xxxxx.xxxx dguimon1@xxx.xx.xxx
> Subject: Re: [amsat-bb] Cubesat NANOSATC-BR
> Date: Tue, 26 Jul 2011 00:44:57 +0200
>
> ----- Original Message -----
> From: "ps8rf Piraja" <ps8rf@xxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Saturday, July 23, 2011 3:53 PM
> Subject: [amsat-bb] Cubesat NANOSATC-BR
>
> Brazil is preparing to launch the NANOSATC-BR. The design of the
BR-NANOSATC
> is being developed by the National Institute for Space Research (INPE) and
> students of Federal University of Santa Maria (UFSM) of state Rio Grande
> do Sul here in Brazil.
>
> "The BR-NANOSATC will have two scientific instruments, a magnetometer and
> also a particle detector of precipitation for monitoring real-time
> geospatial, and the precipitation of particles in the magnetosphere
> disturbances on the Brazilian territory to determine its effects on
regions
> such as the South Atlantic Magnetic Anomaly (SAMA, the English acronym)
and
> the Brazilian sector of the equatorial electrojet.
>
> This anomaly [SAMA] is a "failure" of the Earth's magnetic field in this
> region, which is about Brazil, "said Jose Manuel Octavio Coordinator of
the
> National Institute for Space Research of Brazil. As a consequence of this
> anomaly, there is a greater risk of the presence of particles high-energy
> region, which can affect communications, signals from global positioning
> satellites (like GPS), or even cause failure of electronic equipment
such as
> onboard computers. The INPE has been studying this anomaly for decades,
> including several researchers international reputation, which even took
part
> in defining the mission and its payload. "
>
> According to Otavio Dur?o, Technical Coordinator NanosatC-Br and INPE, the
> situation referred to is its launch in November 2012. The uplink frequency
> (UHF) and downlink (VHF) have been allocated by the IARU. The telemetry
will
> be at 145.865 MHz 9k6 BPSK. The project is receiving support from the
> Amateur Radio Association Santamariense - ASRA and call sign of the
control
> station will be PY3EB. Dur?o told me it will be very interesting and
welcome
> the participation of the Amateur Radio satellite tracking.
>
> We are waiting for soon the website with all the information the CubeSat
> NANOSTC-BR.
>
> The project is in full swing.
>
> IARU Informations:
>
> http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=209
>
> 73'
>
> Piraj?, PS8RF
>
>
> Hi Piraja', PS8RF
>
> Daily I see news about new CubeSat's.. but like the one you mentioned
> (build by commercial company), most of them have nothing to do with
> Ham Radio anymore.
>
> Ham Radio is only the vehicle to use our frequencies, that's all.. they
are
> not interested in ham radio...
>
> I think it will not take long and we may loose our satellite frequencies
> to the CubeSat community of institutes, industry, etc...
>
> On the other hand, if the worldwide ham radio community does not support
> P3-E, how can AMSAT-DL ever finish it and get it launched ?
>
> I'm still optimistic regarding an affordable launch for P3-E in the future
> but it may happen that we have a launch but AMSAT does not exist anymore
> due to the lack of money to keep the world wide organization running..
>
> The old HEO satellite users of OSCAR-10, OSCAR-13 and AO40 are
> becoming old and they are very tired to wait for a real new satellite
> capable to supply a worl wide communications better than on HF as
> promised to us by AMSAT many years ago and this is why the numbar of
> AMSAT member is reducing and the strenght of AMSAT is rapidly
> diminishing or do not exist anymore like actually occurs to AMSAT-France.
>
> You writes only "Brazil is preparing to launch the NANOSATC-BR" so that
> my question is " does AMSAT-Brazil (BRAMSAT) exist anymore ? "
>
> 73" de
>
> i8CVS Domenico
>
>
>
------------------------------
Message: 2
Date: Tue, 26 Jul 2011 16:07:38 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
Subject: [amsat-bb] ARISSatTLM Morse Code Decoder Works on HF Also
To: "'amsat bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <002e01cc4bd8$11e940a0$35bbc1e0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hello Everyone,
Did you know that the Morse Code Decoder window in ARISSatTLM will also
decode Morse on the HF bands?
I was tuning around the low end of 20M and decided to give it a try. I'm
already setup for PSK31 and JT65 on my FT857D so the audio path between the
rig and computer soundcard is setup over here.
Here is what I did ...
1. Start ARISSatTLM
2. Click the start button in the lower left of the Tuning
Indicator window.
3. Tune your HF receiver to put the CW signal in the display
where it says "Put CW Signal Here"
4. Nice steady CW like the ARRL bulletins decodes nicely.
I let it run for a minute and the buffer scrolled nicely
through the display. Reading the CW bulletin was like reading
the mail :-) Short bursty 50 WPM QRZ 5NN contest type operation
missed a few characters. Perhaps it was just a weaker signal
since I was looking for ST0R.
You can get the ARISSatTLM software from http://www.arissattlm.org/. There
is a link on the http://www.amsat.org front page to get a copy of the
software Quick Start Guide.
Have fun!
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 3
Date: Tue, 26 Jul 2011 17:27:14 -0400
From: "Peter Portanova" <wb2oqq@xxxxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Azimuth issue
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <DA66DC27E9D44F28BC7257E060EEB964@xxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Hello
I have a G-5500 and I cannot move the azimuth controls, I also have the LVB
tracker and when I try to manually change CW or CCW on the main unit or LVB
it does not respond, the elevation is fine. I would appreciate any ideas
on where I should begin to determine which part has failed, thank you.
73's Pete
WB2OQQ
www.massapequanyweather.com
------------------------------
Message: 4
Date: Tue, 26 Jul 2011 16:44:05 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
Subject: [amsat-bb] Special Event Station N8M Active on Satellites
This Weekend
To: "'amsat bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <002f01cc4bdd$27c9e460$775dad20$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hello Everyone,
Here is an interesting item. If we waited for the weekend ANS news cycle
this special event activity would be already be over ...
Ford Amateur Radio League, along with other local radio clubs, will be
active during the weekend of July 30th & 31st with the special event call of
N8M located at the Detroit Maker Faire at the Henry Ford Museum of Dearborn
Michigan.
Operating modes will be HF/VHF/SAT/EME CW/VOICE/DIGI conditions
permitting. We hope to work as many Satellites as possible with the special
call. For more info, go to
http://www.thehenryford.org/events/makerFaire.aspx (or)
http://www.k8utt.org/index.htm
For more info, contact N8NWA@xxxxx.xxx
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
Editor, AMSAT News Service
------------------------------
Message: 5
Date: Tue, 26 Jul 2011 16:59:43 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Azimuth issue
To: "'Peter Portanova'" <portanova911@xxxxxxx.xxx>,
<AMSAT-BB@xxxxx.xxx>
Message-ID: <0F26F2459D604CC2A7A5ED8AE71E620E@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Pete,
Various things to try. .
Check the connections at the screw connectors on the back of the control
unit. Sometimes they work loose.
If at all possible, swap the connectors at the rotators. The circuitry is
identical in the G-5500. If the azimuth still doesn't move when you
activate the elevation controls, it is a rotator problem.
If it does move after switching the connectors, the problem is in the
azimuth wiring, or the control box. Disconnect wires 4,5,6 and measure the
DC continuity to the rotator. You should see a couple of ohms 4-6 and 5-6,
and about twice that 4-5. If the continuity is bad, it is a broken wire or
connector. It is unlikely, but possible, that both limit switches have
failed. If the continuity checks good, then look at the voltage from the
control box. Make certain you see AC voltage between 4-6 and 5-6 when you
close the appropriate switch.
If everything checks out, it is probably the phase shift capacitor inside
the motor. Let us know what you find.
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Peter Portanova
Sent: Tuesday, July 26, 2011 4:27 PM
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: G5500 Azimuth issue
Hello
I have a G-5500 and I cannot move the azimuth controls, I also have the LVB
tracker and when I try to manually change CW or CCW on the main unit or LVB
it does not respond, the elevation is fine. I would appreciate any ideas
on where I should begin to determine which part has failed, thank you.
73's Pete
WB2OQQ
www.massapequanyweather.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: 6
Date: Tue, 26 Jul 2011 17:15:56 -0500
From: Jeremy Bomkamp <jeremy.bomkamp@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS BBS/Message Board
To: Kevin Deane <summit496@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<CALtenGw+4xcpXkBm_teLEOjmca38AQdDc0wK8bT_+XLc02b_Ow@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I do remember some discussions on accessing the BBS during non-prime times,
that may be 11pm to 4am for local times, I don't know. But if someone wants
to get on the BBS between those hours I won't care one bit, I'll be
sleeping. I know I don't see much real activity at my location at 5am until
it gets closer to the US east coast. Your other post about the ISS BBS was
in error, we were not using the BBS just the ISS digipeater.
Anyone else's opinions on the best times to access the BBS?
On Mon, Jul 25, 2011 at 7:26 PM, Kevin Deane <summit496@xxxx.xxx> wrote:
>
> So the general opinion on here and from some people across the world is
> that using the BBS ruins the pass for basicly everyone in the footprint.
> Well after my friend in Reno could not get a message on while I was on the
> BBS and myself while he was on it, I can see the truth of the matter is
> clear. I am new to radio and Packet/APRS, learning and having fun.
>
> I will just have fun blastin away at the message board and hope to catch
> someone at there keyboard. I do sympathize with anyone who was not able to
> get on while I was getting messages from actual people that helped me get
> started with Packet in France and the Czech Republic.
>
> I will stay off the BBS, unless in the future if I find someone who wishes
> to have a Digi Qsl via ISS BBS who is outside my footprint, then at least I
> will KNOW I am being selfish and will enjoy hogging the ISS only just a
> little bit less now.
>
>
> Kevin
> KF7MYK
>
>
> _______________________________________________
> 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
>
--
AB9RU
------------------------------
Message: 7
Date: Wed, 27 Jul 2011 00:14:08 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] ARISSat-1 Battery Charging
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <9A30B0F7-5DD7-4206-ABD2-FCC74948662A@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
At the top of today's schedule for the Russians aboard the ISS ...
"Operations and experiments on the International Space Station July 27, 2011
- On July 27 the Russian
segment of International Space Station, astronauts plan to continue their
work to prepare for spacewalk
(leak check suits, ping, and medical settings via spacesuits and equipment
in the docking compartment,
"Pierce" and the transitional compartment service module "Zvezda", charging
unit supply for micro
"Cedar"), control mikroekosfery habitat connectivity DPO ship "Progress
M-11M" to the management
and maintenance of the ISS coolant ... "
Clint Bradford, K6LCS
http://www.work-sat.com
------------------------------
Message: 8
Date: Wed, 27 Jul 2011 05:02:51 -0400
From: "Fred VE3FAL" <flesnick@xxxxxxx.xxx>
Subject: [amsat-bb] FAST2
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <6214655089F54D51B0CF856EA0CD6758@xxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
I copied a data line tonight at 03:55 EST while at work. The data was from
FAST2 (EMMA) on 145.825, first time copying this data.
Fred
CIW649/VE3FAL
CFARS Member
SATERN Member
SATERN Amateur Radio Liaison Officer
DEC Amethyst District ARES
SKCC QRP Awards Manager SKCC#50
http://www.skccgroup.com
RU QRP Club # 285
------------------------------
Message: 9
Date: Wed, 27 Jul 2011 05:07:50 -0400
From: "Sion Chow Q. C. (9W2QC)" <9w2qc@xxxxx.xxx>
Subject: [amsat-bb] Repair of SSB Preamp/Downconverter
To: amsat-bb@xxxxx.xxx
Message-ID: <20110727050750.39412dnoc3mknbfo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"
Dear All,
I remember asking on this list before about sources to repair a fault
SSB SP-7000 70CM Masthead Preamp and SSB UEK-3000 2.4 GHz - 144 MHz
downconverter a while back (should be about 2 years ago if my memory
serves me right) and got a reply from someone in Japan who does
provide this service.
Would be glad if that person could kindly e-mail to me off the list as
I have some inquiries to make about the repair service. Unfortunately
I lost his email address and could not trace back that e-mail.
Thank you, and please accept my apologies for the bandwidth.
73,
Sion Chow Q. C.,
9M2CQC, 9V1QC, WQ2C /HL1,
ex: 9W2QC, AB3IO
------------------------------
Message: 10
Date: Wed, 27 Jul 2011 06:45:34 -0400
From: "Jeff KB2M" <kb2m@xxxxxxx.xxx>
Subject: [amsat-bb] Re: G5500 az el issue resolved!
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <002401cc4c4a$50eb23a0$f2c16ae0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Thanks to all for the refresher on the 5500 repair. I replaced the 17806P
(which I think has a 6v output) with a 7805. This fixed the problem. I had
to recalibrate as my max readings in the SatPC32 rotor calibration routine
dropped because of the assumed lower output voltage of the 7805 regulator. I
could only get a max azimuth reading of 206, somewhat less than the 255
needed, but this seems to work ok.
Does anyone know a source for a replacement bulb in the display? Both my
bulbs are burned out and I would like to replace them with something I can
obtain locally. Thanks again for all the help...
73 Jeff kb2m
------------------------------
Message: 11
Date: Wed, 27 Jul 2011 00:14:13 -0600
From: Lee Maisel <maisel@xxxx.xxx>
Subject: [amsat-bb] Solar Flare prediction
To: AMSAT-BB@xxxxx.xxx
Message-ID: <4E2FACB5.10407@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
This is kind of related to satellites generally, and may have been
discussed here before, but I was flabbergasted, and had to share.
Very interesting. And to be able to predict solar flares a day and a
half before they erupt can prove very useful!!
http://news.stanford.edu/news/2010/august/sun-082310.html
Lee
W5LMM
------------------------------
Message: 12
Date: Wed, 27 Jul 2011 08:25:49 -0400
From: "Mike" <mikef1234@xxxxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Full Duplex?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <FE72374E92844D8BBEF8C495270FB436@xxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
I'm having a difficult time of understanding the concept of Full Duplex. Can
anyone explain it to me? I have the ARRL satellite book, read about it in
there and Wikipedia. I still didn't understand how it works with a
transceiver setup like we use.
Mike N8GBU
------------------------------
Message: 13
Date: Wed, 27 Jul 2011 06:05:49 -0700 (PDT)
From: Nader Omer <st2nh@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS Message Board,
To: amsat bb bb <amsat-bb@xxxxx.xxx>
Message-ID:
<1311771949.83860.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi
?
It was so interesting to work ISS BBS over Africa :)???( Only You )
?
http://www.amsat.org/amsat/archive/amsat-bb/200901/msg00853.html
?
More interest than ISS? was AO-51 9k6?Pacsat mode?. I really miss it.
http://www.st2nh.com/photos
?
?
73's Nader
------------------------------
Message: 14
Date: Wed, 27 Jul 2011 09:06:38 -0400
From: g0mrf@xxx.xxx
Subject: [amsat-bb] Re: Full Duplex?
To: mikef1234@xxxxxxxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <8CE1A7527A469EB-150C-265FF@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Mike.
Full duplex is where you can receive the signal from the satellite at the
same time as you are transmitting up to it.
It allows you to hear your own signal through the satellites transponder. So
you know if your signal made it, or if it was submerged under someone else
who was transmitting at the same time.
Full duplex radios are the exception, but well worth having.
Another method is to use 2 simlex radios to get the same result.
David G0MRF
I'm having a difficult time of understanding the concept of Full Duplex. Can
anyone explain it to me? I have the ARRL satellite book, read about it in
there and Wikipedia. I still didn't understand how it works with a
transceiver setup like we use.
=
------------------------------
Message: 15
Date: Wed, 27 Jul 2011 09:11:53 -0400
From: "Stephen E. Belter" <seb@xxxxxx.xxx>
Subject: [amsat-bb] Re: G5500 az el issue resolved!
To: "AMSAT-BB@xxxxx.xxxx <AMSAT-BB@xxxxx.xxx>
Cc: "kb2m@xxxx.xxxx <kb2m@xxxx.xxx>
Message-ID:
<51668A33220E754EABE6583357ECEE2D79CD54D6@xxxxxxxx.xxxxxx.xxxxx>
Content-Type: text/plain; charset="us-ascii"
Jeff,
I replaced the meter bulbs in my G-5400B once, only to be disappointed that
they burned out relatively soon.
I have now put two white LEDs above each meter. From memory, I put two LEDs
and a current limiting resistor (about 1 Kohm) in series and connected it to
the 12 volts for the bulbs, one set above each meter.
I sent you a picture by separate e-mail.
73, Steve N9IP
--
Steve Belter
Thanks to all for the refresher on the 5500 repair. I replaced the 17806P
(which I think has a 6v output) with a 7805. This fixed the problem. I had
to recalibrate as my max readings in the SatPC32 rotor calibration routine
dropped because of the assumed lower output voltage of the 7805 regulator. I
could only get a max azimuth reading of 206, somewhat less than the 255
needed, but this seems to work ok.
Does anyone know a source for a replacement bulb in the display? Both my
bulbs are burned out and I would like to replace them with something I can
obtain locally. Thanks again for all the help...
73 Jeff kb2m
_______________________________________________
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: 16
Date: Wed, 27 Jul 2011 09:19:10 -0400
From: Diane Bruce <db@xx.xxx>
Subject: [amsat-bb] Re: G5500 az el issue resolved!
To: Jeff KB2M <kb2m@xxxxxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Message-ID: <20110727131910.GA84045@xxxxx.xx.xxx>
Content-Type: text/plain; charset=us-ascii
On Wed, Jul 27, 2011 at 06:45:34AM -0400, Jeff KB2M wrote:
> Thanks to all for the refresher on the 5500 repair. I replaced the 17806P
> (which I think has a 6v output) with a 7805. This fixed the problem. I had
> to recalibrate as my max readings in the SatPC32 rotor calibration routine
> dropped because of the assumed lower output voltage of the 7805 regulator. I
Put a pair of silicon diodes between the ground end of the 7805 and
actual ground.
http://bybeelabs.com/uploads/J0308_Dac_Applications.pdf
I was going to suggest this trick before, but thought you had already
ordered a 7806. This will increase it to just about perfect. You might
even get away with a single diode.
While you are in there, don't forget to bypass the input and output with
a little more capacitance. The ceramic they have shown in the schematic is
insufficient. The 7806 itself can start oscillating making a noisy racket
all over HF and VHF. I used a 4.7uf since I had one lying around.
http://www.sunsunsun.net/kd4app/amsat/g5500.htm
- 73 Diane VA3DB
--
- db@xxxxxxx.xxx db@xx.xxx http://www.db.net/~db
Why leave money to our children if we don't leave them the Earth?
------------------------------
Message: 17
Date: Wed, 27 Jul 2011 08:23:01 -0500
From: "Lowell White" <whiteld@xxx.xxx>
Subject: [amsat-bb] Re: Full Duplex?
To: "Mike" <mikef1234@xxxxxxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <815PgANwB7776S04.1311772981@xxxxx.xxx.xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Mike,
Consider these:
-Full Duplex is receiving and transmitting at the same time, typically on
different frequencies (bands).
-When working satellites in this mode, you are doing the same thing as their
transponder is :-)
-When you hear your / another signal in the receiver, presuming it and the
transmitter are tuned to the right frequencies, it represents what you or
other stations are transmitting to the satellite.
Does that help?
73,
Lowell
K9LDW
------ Original Message ------
Received: Wed, 27 Jul 2011 07:29:45 AM CDT
From: "Mike" <mikef1234@xxxxxxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Full Duplex?
> I'm having a difficult time of understanding the concept of Full Duplex.
Can
> anyone explain it to me? I have the ARRL satellite book, read about it in
> there and Wikipedia. I still didn't understand how it works with a
> transceiver setup like we use.
>
>
>
> Mike N8GBU
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
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------------------------------
Message: 18
Date: Wed, 27 Jul 2011 09:24:36 -0400
From: "Zachary Beougher" <zack.kd8ksn@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Full Duplex?
To: "Mike" <mikef1234@xxxxxxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <SNT111-DS1EF52D4545365DA80EB34B3350@xxx.xxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Mike,
Full duplex is pretty simple: Listening to the downlink (receive) while
*simultaneously* transmitting on the uplink. This enables you to hear you
transmission WHILE YOU ARE TRANSMITTING - at the same time.
There are a lot of benefits behind operating this way, the main one being
reducing QRM to other stations and maximizing operating time.
Does that answer your question?
73,
Zack
KD8KSN
-----Original Message-----
From: Mike
Sent: Wednesday, July 27, 2011 8:25 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Full Duplex?
I'm having a difficult time of understanding the concept of Full Duplex. Can
anyone explain it to me? I have the ARRL satellite book, read about it in
there and Wikipedia. I still didn't understand how it works with a
transceiver setup like we use.
Mike N8GBU
_______________________________________________
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 member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 397
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