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CX2SA > SATDIG 17.08.08 23:41l 1086 Lines 32806 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: G-5500 7806 regulator question (i8cvs)
2. Re: 5500 maintenance ? (w7lrd(AT)comcast.net)
3. Re: ANS-230 AMSAT News Service Weekly Bulletins (Ken Owen)
4. Re: AMSAT UK P3E Lecture HEO vs GEO. and AMSAT-NA Priorities
(Nate Duehr)
5. Rusty AO-40 (w7lrd(AT)comcast.net)
6. Re: Rusty AO-40 (Greg D.)
7. Re: COMPASS-1 needs your help (Mike Rupprecht)
8. COMPASS-1 recovery attempt 0940utc (17/8): failed (Henk, PA3GUO)
9. Re: COMPASS-1 recovery attempt 0940utc (17/8): failed (Angus)
10. Re: COMPASS-1 needs your help (Alan Cresswell)
11. Re: DIY: Parabolic mirror (mvm)
12. Compass-1 recovery efforts (Bob DeVarney W1ICW)
13. Compass-1 (Cox)
14. Re: Rusty AO-40 (Dee)
15. Re: G-5500 7806 regulator question (SV1BSX)
----------------------------------------------------------------------
Message: 1
Date: Sun, 17 Aug 2008 03:56:50 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: G-5500 7806 regulator question
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>, "Mark L. Hammond"
<n8mh(AT)embarqmail.com>
Message-ID: <00b701c9000c$83ee2640$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
To: <amsat-bb(AT)amsat.org>
Sent: Sunday, August 17, 2008 1:54 AM
Subject: [amsat-bb] G-5500 7806 regulator question
> Hello All,
>
> It appears that the 7806 voltage regulator in my Yaesu G-5500 control box
has gone bad; the output is measuring more like 10.8 Volts (!). This
explains why both position indicators were off by a factor of 2 (e.g.,
elevation meter showing 90 deg, array pointing 45; azimuth meter showing 180
deg, but array pointing 90 deg., and so on).
>
> Question---has anybody used a 7805 to replace the 7806 regulator in this
control box?
>
> I don't have a 7806....so this brings the next question--anybody have a
7806 (or 2) that they want to sell?)
>
> Thanks,
>
> Mark L. Hammond [N8MH]
>
Hello, Mark N8MH
Each load across the 7806 regulator is represented by a 500 ohm
potentiometer with in series a 15 ohm resistor.
The load across the wiper of the 500 ohm potentiometer is 10 K
and so it is not considered in the following calculation.
If you replace the 7806 with a 7805 regulator the current flowing through a
resistor R= 15+500 = 515 ohm will be I= 5 / 515 = 0.009708 A and the drop
of voltage across the 15 ohm resistor will be only
V= 15 x 0.009708 = 0.145 volt
Since the voltages for the AZ and EL instruments are supplied by the
operational amplifiers Q3 and Q4 respectively you can adjust VR1 and VR2
to get again a full scale indication.
The 5 volt voltages for computer control are supplied by the operational
amplifiers respectively Q3 for the AZ and Q4 for the EL so that when the
AZ is rotated fully clockwise the potentiometer VR3 must be adjusted to get
exactly 5 volt DC on pin 6 of the external control 8 pin DIN connector and
VR4 to get 5 volt DC on pin 1 when the EL is fully rotated by 180 degrees
(flipping)
Looking the 8 pin DIN connector from the back of control box (external view)
pin 6 is the first hole clockwise and pin 1 is the second hole clockwise
Conclusion:
It seems that a 7805 will work
73" de
i8CVS Domenico
------------------------------
Message: 2
Date: Sun, 17 Aug 2008 02:19:36 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] Re: 5500 maintenance ?
To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "nader omer" <st2nh(AT)yahoo.com>,
"AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID:
<081720080219.20880.48A78AB8000C72B60000519022165384960B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
I have found that no matter what it is always easier to do some simple
preventative maintenance while it is on the bench as opposed to being stuck in
the middle of January in a snow storm, up on the tower. Remember Mr. Murphy
is always looking for us!
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
> ----- Original Message -----
> From: "nader omer"
> To:
> Sent: Sunday, August 17, 2008 1:08 AM
> Subject: [amsat-bb] 5500 maintenance ?
>
> After two years of storing my new 5500 rotor in upside position in a hot
> place. I found small pool (2X2 cm) of a yellow oily liquid under it .
> Dose this rotor need any maintenance before I can reuse it again?
>
>
> Hi my friend Nader, ST2NH
>
> If the rotor works I don't think that preventional maintenance is actually
> strictly necessary.
>
> FO-29 is back again with strong signals and I hope to meet you again from
> Saudy Arabia.
>
> 73" de
>
> i8CVS Domenico
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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: Sat, 16 Aug 2008 20:12:18 -0700
From: "Ken Owen" <n6kth(AT)n6kth.com>
Subject: [amsat-bb] Re: ANS-230 AMSAT News Service Weekly Bulletins
To: <amsat-bb(AT)amsat.org>
Message-ID: <003101c90017$0f3fff70$2e01a8c0(AT)CIR2>
Content-Type: text/plain; charset="us-ascii"
Hi folks:
Here is an update on the information presented in the AMSAT News Service
about an upcoming ARISS contact:
The contact has moved up to Tuesday August 19 at 15:39 UTC. The Santa
Barbara Amateur Radio Club (SBARC) will be providing the equipment and
expertise for the contact, and the club will also be working with the scouts
to earn their radio merit badges. We will be operating under SBARC's call,
K6TZ.
One of the most interesting aspects of this contact is that Dr. Gregory
Chamitoff (KD5PKZ) who is currently stationed on the ISS, is acquainted with
the troop's assistant scout master and requested this contact.
For more information on the contact, please visit the following URL:
http://www.n6kth.com/iss
The contact will be streamed live online at this URL:
http://sbarc.camstreams.com/
Ken Owen, N6KTH
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of JoAnne Maenpaa
Sent: Saturday, August 16, 2008 6:26 PM
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] ANS-230 AMSAT News Service Weekly Bulletins
AMSAT NEWS SERVICE
ANS-230
An ARISS contact has been slated for Thursday, August 21 at 14:55 UTC
with Los Padres Council Troop 105 in Santa Barbara, California. Boy
Scouts, ages 12-17 will work on their Astronomy, Space Exploration and
Radio Merit Badges. Cub Scout units will have materials available to
work on the Astronomy and Science belt loops and Astronomy and Science
academic pins. The University of California, Santa Barbara (UCSB)
Physics Department will make available its astronomy observation deck
for the contact and will provide faculty members to instruct the Scouts.
The Scouts will be presented with information on the ISS and its crew
to prepare them for this activity and the media will be notified.
------------------------------
Message: 4
Date: Sat, 16 Aug 2008 21:25:45 -0600
From: Nate Duehr <nate(AT)natetech.com>
Subject: [amsat-bb] Re: AMSAT UK P3E Lecture HEO vs GEO. and AMSAT-NA
Priorities
To: AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <8AE4ACDB-718D-4BFF-98AC-F01740FD7AB3(AT)natetech.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On Aug 12, 2008, at 7:24 AM, Sebastian wrote:
> Actually, XM has 2 functioning satellites, and 2 orbiting spares.
And "actually" XM and Sirius are now the same company after their
merger. So, referring to them as separate companies is inaccurate.
http://en.wikipedia.org/wiki/XM_Satellite_Radio - discusses why their
two original birds are no longer in use. Solar panel fogging which
shortened their life-span.
--
Nate Duehr, WY0X
nate(AT)natetech.com
------------------------------
Message: 5
Date: Sun, 17 Aug 2008 04:31:06 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] Rusty AO-40
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<081720080431.23652.48A7A98A0008FEDD00005C6422155670740B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Hello
My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S
band downlink. I forget the conversion frequency on a 3731aa downconverter to
the two meter band. With the pass duration I don't have a lot of time to look,
which I did. Anyone aim me to the correct frequency?
73 Bob W7LRD
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 6
Date: Sat, 16 Aug 2008 23:56:33 -0700
From: "Greg D." <ko6th_greg(AT)hotmail.com>
Subject: [amsat-bb] Re: Rusty AO-40
To: <w7lrd(AT)comcast.net>, AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <BLU133-W44CAF0AAC5FB66F9CA7D73A96F0(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob,
I think the 3731's LO is at 2256, so subtract that from the 2401.200 +/-
downlink frequency. You should get something around 145.200. Doppler will
shift that +/- about 50 kHz, and then you need to factor in your own unit's
offset (my modified Drake is off by about another 50 kHz).
I wish you had it running earlier today. I had the satellite all to myself
during the 7:30pm PDT pass.
Greg KO6TH
----------------------------------------
> From: w7lrd(AT)comcast.net
> To: AMSAT-BB(AT)amsat.org
> Date: Sun, 17 Aug 2008 04:31:06 +0000
> Subject: [amsat-bb] Rusty AO-40
>
> Hello
> My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S
band downlink. I forget the conversion frequency on a 3731aa downconverter to
the two meter band. With the pass duration I don't have a lot of time to look,
which I did. Anyone aim me to the correct frequency?
> 73 Bob W7LRD
>
> --
> "if this were easy, everyone would be doing it"
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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
_________________________________________________________________
Get thousands of games on your PC, your mobile phone, and the web with
Windows?.
http://clk.atdmt.com/MRT/go/108588800/direct/01/
------------------------------
Message: 7
Date: Sun, 17 Aug 2008 11:12:19 +0200
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
Subject: [amsat-bb] Re: COMPASS-1 needs your help
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <003801c90049$5a408440$0ec18cc0$(AT)de>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
Now we received 2 successfully contacts with COMPASS from Alan (ZL2BX) and
Sion (9W2QC).
On both passes was COMPASS in full sunlight.
The most important commando is ****#14#200# to switch the heater off.
Thank you so much for your effort and time. And please, continue to trying
and help us to recover COMPASS.
Again, thank you very much for your help.
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
Auftrag von Alan Cresswell
Gesendet: Samstag, 16. August 2008 23:22
An: 'AMSAT-BB'
Betreff: [amsat-bb] Re: COMPASS-1 needs your help
Mike,
I have just sent the tone sequences to compass and received a very short
beep tone immediately after each command on the downlink. The tone has a
slight change of pitch for its duration. The equipment used was a TS-2000
with the tones in memory and the tone duration set to "SLOW" (100ms tone,
100ms mute).
Compass pass at 2102 UT and max el 54 deg.
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Mike Rupprecht
Sent: Saturday, 16 August 2008 13:55
To: 'AMSAT-BB'
Cc: Jakob.Schab(AT)gmx.de; johannes.piepenbrock(AT)gmx.de;
felix.koenig(AT)alumni.fh-aachen.de; 'Artur Scholz'; kev(AT)kunz.biz
Subject: [amsat-bb] COMPASS-1 needs your help
Hi all,
The recent events are dramatically. Our two ground stations are almost
inoperable.
A few days ago however, a hard-reset of the satellite had occurred, which
brought the satellite back into the following vicious circle: Once the
heater is being switched on, the battery power drops drastically, which
causes another hard-reset. This goes on and on. The only chance to recover
the satellite is to avoid the activation of the heater. This can be done by
adjusting threshold values.
Since these values are reset after each hard-reset, we would need to send
them again and again, until the satellite is in a stable condition
(batteries charging), where no reset occurs.
Thus, if you would like to support this recovery phase and have the right
equipment to do so, please upload the following DTMF tones to COMPASS-1
(simply from loudspeaker via microphone)
THRESHOLD ADJUSTMENT (to do after every hard reset)
****14#200# heater off to -55 degr THIS
IS THE VERY IMPORTANT COMMAND
****13#200# heater on to -55 degr
****16#170# critical batt threshold to 3.3V
****15#255# low batt threshold to max -> charge batteries
The commands consist of 4 stars, two numbers, a hash, 3 numbers, and a hash.
If COMPASS receive this sequence successfully you can hear a short
confirmation beep.
There is an good and free DTMF dialer to download here:
<http://www.polar-electric.com/DTMF/Index.html#Encoder>
http://www.polar-electric.com/DTMF/Index.html#Encoder
Uplink: 145.980 MHz FM
Downlink: 437.275 MHz CW
If you have any questions, please ask me. Thank you very much in advance !!!
We appreciate your support!! On behalf the COMPASS-team
73, Mike DK3WN
For more information see : http://www.raumfahrt.fh-aachen.de/news.htm
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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(AT)amsat.org. 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(AT)amsat.org. 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: 8
Date: Sun, 17 Aug 2008 11:51:00 +0200 (CEST)
From: "Henk, PA3GUO" <hamoen(AT)iae.nl>
Subject: [amsat-bb] COMPASS-1 recovery attempt 0940utc (17/8): failed
To: <amsat-bb(AT)amsat.org>
Message-ID: <1677.212.61.85.20.1218966660.squirrel(AT)webmail.iae.nl>
Content-Type: text/plain; charset=iso-8859-1
All,
COMPASS should have been in sunlight this morning (0940utc) over Europe.
Encouraged by the positive results from ZL, I was hoping to be able to
upload the commands into the satellite.
However, none of my commands was answered by a 'beep' from COMPASS.
Henk, PA3GUO,
The Netherlands
http://www.pa3guo.com
> All,
>
> During the entire pass (max 72 degrees elevation) I have
> submitted the commands (mostly only the first one, a few
> times all four of them shortly after eachother).
>
> However, I have not heared a single tone on the downlink
> so we must assume this attempt failed.
>
> Henk, PA3GUO
> http://www.pa3guo.com
>
>
>
------------------------------
Message: 9
Date: Sun, 17 Aug 2008 11:00:23 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] Re: COMPASS-1 recovery attempt 0940utc (17/8):
failed
To: <amsat-bb(AT)amsat.org>
Message-ID: <C42E358844774CC199B95808A20BA47F(AT)GusPC>
Content-Type: text/plain; format="flowed"; charset="iso-8859-1";
reply-type="original"
I was monioring the last pass also and nothing was heard, this last pass was
a good pass and should have been in full sunlight.
I will also make an attempt to upload the command to switch the heater off
on the next pass (around 11.13UTC)
good luck everyone
regards
Gus M0IKB
----- Original Message -----
From: "Henk, PA3GUO" <hamoen(AT)iae.nl>
To: <amsat-bb(AT)amsat.org>
Sent: Sunday, August 17, 2008 10:51 AM
Subject: [amsat-bb] COMPASS-1 recovery attempt 0940utc (17/8): failed
> All,
>
> COMPASS should have been in sunlight this morning (0940utc) over Europe.
>
> Encouraged by the positive results from ZL, I was hoping to be able to
> upload the commands into the satellite.
>
> However, none of my commands was answered by a 'beep' from COMPASS.
>
> Henk, PA3GUO,
> The Netherlands
> http://www.pa3guo.com
>
>
>
>> All,
>>
>> During the entire pass (max 72 degrees elevation) I have
>> submitted the commands (mostly only the first one, a few
>> times all four of them shortly after eachother).
>>
>> However, I have not heared a single tone on the downlink
>> so we must assume this attempt failed.
>>
>> Henk, PA3GUO
>> http://www.pa3guo.com
>>
>>
>>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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
>
--
I am using the free version of SPAMfighter for private users.
It has removed 1868 spam emails to date.
Paying users do not have this message in their emails.
Get the free SPAMfighter here: http://www.spamfighter.com/len
------------------------------
Message: 10
Date: Sun, 17 Aug 2008 10:55:02 -0000
From: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Subject: [amsat-bb] Re: COMPASS-1 needs your help
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <001601c90057$b42750c0$0301010a(AT)Cresswell2>
Content-Type: text/plain; charset="iso-8859-1"
Hi Mike,
Unfortunately I was out for the second sunlit pass over ZL this morning so
was unable to send commands on that pass.
I have just had two Compass passes here in eclipse. No response to the
commands so will try again in the morning when there are three sunlit passes
here although two are quite low (9 and 8 degrees) and one good one at 84
deg.
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Mike Rupprecht
Sent: Sunday, 17 August 2008 09:12
To: 'AMSAT-BB'
Subject: [amsat-bb] Re: COMPASS-1 needs your help
Hi all,
Now we received 2 successfully contacts with COMPASS from Alan (ZL2BX) and
Sion (9W2QC).
On both passes was COMPASS in full sunlight.
The most important commando is ****#14#200# to switch the heater off.
Thank you so much for your effort and time. And please, continue to trying
and help us to recover COMPASS.
Again, thank you very much for your help.
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
Auftrag von Alan Cresswell
Gesendet: Samstag, 16. August 2008 23:22
An: 'AMSAT-BB'
Betreff: [amsat-bb] Re: COMPASS-1 needs your help
Mike,
I have just sent the tone sequences to compass and received a very short
beep tone immediately after each command on the downlink. The tone has a
slight change of pitch for its duration. The equipment used was a TS-2000
with the tones in memory and the tone duration set to "SLOW" (100ms tone,
100ms mute).
Compass pass at 2102 UT and max el 54 deg.
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Mike Rupprecht
Sent: Saturday, 16 August 2008 13:55
To: 'AMSAT-BB'
Cc: Jakob.Schab(AT)gmx.de; johannes.piepenbrock(AT)gmx.de;
felix.koenig(AT)alumni.fh-aachen.de; 'Artur Scholz'; kev(AT)kunz.biz
Subject: [amsat-bb] COMPASS-1 needs your help
Hi all,
The recent events are dramatically. Our two ground stations are almost
inoperable.
A few days ago however, a hard-reset of the satellite had occurred, which
brought the satellite back into the following vicious circle: Once the
heater is being switched on, the battery power drops drastically, which
causes another hard-reset. This goes on and on. The only chance to recover
the satellite is to avoid the activation of the heater. This can be done by
adjusting threshold values.
Since these values are reset after each hard-reset, we would need to send
them again and again, until the satellite is in a stable condition
(batteries charging), where no reset occurs.
Thus, if you would like to support this recovery phase and have the right
equipment to do so, please upload the following DTMF tones to COMPASS-1
(simply from loudspeaker via microphone)
THRESHOLD ADJUSTMENT (to do after every hard reset)
****14#200# heater off to -55 degr THIS
IS THE VERY IMPORTANT COMMAND
****13#200# heater on to -55 degr
****16#170# critical batt threshold to 3.3V
****15#255# low batt threshold to max -> charge batteries
The commands consist of 4 stars, two numbers, a hash, 3 numbers, and a hash.
If COMPASS receive this sequence successfully you can hear a short
confirmation beep.
There is an good and free DTMF dialer to download here:
<http://www.polar-electric.com/DTMF/Index.html#Encoder>
http://www.polar-electric.com/DTMF/Index.html#Encoder
Uplink: 145.980 MHz FM
Downlink: 437.275 MHz CW
If you have any questions, please ask me. Thank you very much in advance !!!
We appreciate your support!! On behalf the COMPASS-team
73, Mike DK3WN
For more information see : http://www.raumfahrt.fh-aachen.de/news.htm
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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(AT)amsat.org. 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(AT)amsat.org. 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(AT)amsat.org. 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: Sun, 17 Aug 2008 14:27:59 +0200
From: mvm <amvm(AT)skynet.be>
Subject: [amsat-bb] Re: DIY: Parabolic mirror
To: "Greg D." <ko6th_greg(AT)hotmail.com>
Cc: "amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <48A8194F.3000609(AT)skynet.be>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
http://medusa.as.arizona.edu/lbto/tech/mirror.htm
Greg D. schreef:
> Best "form" is probably not to have one. Wasn't there a post recently
talking about making a mirror by spinning casting resin in a shallow round
dish? Perhaps a good use for that old record (*) player gathering dust in the
> garage...
>
> Greg KO6TH
>
> (*) an ancient mechanical instrument for storing music in an analog form
>
>
> ----------------------------------------
>
>> Date: Thu, 14 Aug 2008 15:59:26 -0400
>> From: ka2pbt(AT)arrl.net
>> To: amsat-bb(AT)amsat.org
>> Subject: [amsat-bb] Re: DIY: Parabolic mirror
>>
>> agree ..... what would be a good form to start with rather than the bottom
>> of some random water tank??
>>
>> Assuming you had a proper form ... I think the construction process has
>> merit.
>>
>> The next step would be to coat the fiberglass shell with something metallic
>> ... foil ... screen ????
>>
>>
>>
>> On Thu, Aug 14, 2008 at 2:04 PM, Franklin Antonio wrote:
>>
>>
>>> At 07:34 AM 8/14/2008, Joe wrote:
>>>
>>>
>>>> Too bad it's not parabolic, and probably far from even spherical.
>>>>
>>>>
>>> Precisely. Apparently the author thinks "parabolic" just means some kinda
>>> symmetrical concave surface.
>>>
>>> This guy obviously isn't an antenna guy.
>>>
>>> I've found Make magazine to be a crock in general. Too bad.
>>>
>>>
>>>
>>>
>> _______________________________________________
>> Sent via AMSAT-BB(AT)amsat.org. 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
>>
>
> _________________________________________________________________
> Reveal your inner athlete and share it with friends on Windows Live.
> http://revealyourinnerathlete.windowslive.com?locale=en-
us&ocid=TXT_TAGLM_WLYIA_whichathlete_us
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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
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>
------------------------------
Message: 12
Date: Sun, 17 Aug 2008 10:38:23 -0400
From: Bob DeVarney W1ICW <we1u(AT)verizon.net>
Subject: [amsat-bb] Compass-1 recovery efforts
To: amsat-bb(AT)amsat.org
Message-ID: <48A837DF.1040606(AT)verizon.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Mike and team,
I was able to send the commands as well this morning on the 14:30 pass
over the Eastern US, and received a "chirpy" confirmation tone after
each command ( basically after each second # )
I sent the commands a total of five times to make sure they "stuck".
Downlink beep was a good solid S-5 using M2 436CP30 and SSB preamp at
the antenna.
I monitored the satellite for the entire pass and heard nothing else out
of it.
73 and VY GUD LUCK de Bob W1ICW
And congrats to Alan, ZL2BX!
--
------------------------------
Message: 13
Date: Sun, 17 Aug 2008 10:48:12 -0400
From: "Cox" <snyderb(AT)cox.net>
Subject: [amsat-bb] Compass-1
To: "Amsat-bb" <amsat-bb(AT)amsat.org>
Message-ID: <000a01c90078$46278380$6801a8c0(AT)CHRIS>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
BB
No CW D/L heard at 16:18 UTC from grid FM16vt during 43 deg elv pass
other then a steady carrier signal at 437.275
73 Bruce KG4YEV
------------------------------
Message: 14
Date: Sun, 17 Aug 2008 10:50:41 -0400
From: Dee <morsesat(AT)optonline.net>
Subject: [amsat-bb] Re: Rusty AO-40
To: "Greg D." <ko6th_greg(AT)hotmail.com>
Cc: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <48A83AC1.7090006(AT)optonline.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Greg D. wrote:
>Hi Bob,
>
>I think the 3731's LO is at 2256, so subtract that from the 2401.200 +/-
downlink frequency. You should get something around 145.200. Doppler will
shift that +/- about 50 kHz, and then you need to factor in your own unit's
offset (my modified Drake is off by about another 50 kHz).
>
>I wish you had it running earlier today. I had the satellite all to myself
during the 7:30pm PDT pass.
>
>Greg KO6TH
>
>
>----------------------------------------
>
>
>>From: w7lrd(AT)comcast.net
>>To: AMSAT-BB(AT)amsat.org
>>Date: Sun, 17 Aug 2008 04:31:06 +0000
>>Subject: [amsat-bb] Rusty AO-40
>>
>>Hello
>>My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S
band downlink. I forget the conversion frequency on a 3731aa downconverter to
the two meter band. With the pass duration I don't have a lot of time to look,
which I did. Anyone aim me to the correct frequency?
>>73 Bob W7LRD
>>
>>--
>>"if this were easy, everyone would be doing it"
>>_______________________________________________
>>Sent via AMSAT-BB(AT)amsat.org. 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
>>
>>
>
>_________________________________________________________________
>Get thousands of games on your PC, your mobile phone, and the web with
Windows?.
>http://clk.atdmt.com/MRT/go/108588800/direct/01/
>_______________________________________________
>Sent via AMSAT-BB(AT)amsat.org. 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
>
>
>
>
Yes,
I agree. The 3731, if it was modified for 2 meters, output is 145.200
plus/minus doppler. Here on the East coast...I had a nice QSO with a
VE3 and K5 with the satellite without anyone else. I had blown my
original K5GNA unit as I transmitted into it with my Icom 910. I had a
spare-Mr. Murphy planning. Thanks to the AO-51 crew for putting a few
days of 2.4 so we can test out units for future ops(Hopefully!!??!!)
73,
Dee, NB2F
P.S. Get over AO-40 already---I miss it too but.... Let's keep on the
BOD to do the right stuff!!??!!
------------------------------
Message: 15
Date: Sun, 17 Aug 2008 18:48:13 +0300
From: "SV1BSX" <sv1bsx(AT)yahoo.gr>
Subject: [amsat-bb] Re: G-5500 7806 regulator question
To: <amsat-bb(AT)amsat.org>, "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Message-ID: <001e01c90080$af87db60$0b09a8c0(AT)zeus>
Content-Type: text/plain; format=flowed; charset="windows-1253";
reply-type=original
Hi Mark, Hi all,
another almost unknown but better and much more accurate combination in
order to
increase the output
of any 78xx regulator is possible by making a divider in the output of 78xx
regulator according to the formula:
R1=VR/0.02 ( where VR the nomimal output of 78xx regulator)
R2=VB/0.025 (where VB the difference in Volts between "nomimal" output
Voltage of 78xx and "request" output Voltage)
In -----------
---| 78xx |-----o---OUT
----------- |
| R1
o----------|
|
R2
|
-------o-------------- 0V (GND)
Therefore, in case we have a 7805 and we need 6 Volts output:
VR=5 => R1= 5/0.02 = 250 Ohms
VB (Differential Voltage): 6 - 5 = 1
R2 = 1/0.025 = 40 Ohms
You can replace R1, R2 with standard value-resistors:
R1=220+27 Ohms
R2 = 39 Ohms
The R1 is connected between + OUT and GND-Pin of 78xx. The R2 between
GND-Pin of 78xx
and GROUND (see my figure above).
*** HOWEVER, in this case the Hotsink (metal plate) of 78xx MUST BE ISOLATED
from the 0V !!
Just keep in mind that, because the Pin2 is internally connected
to metal-plate of 78xx ! So, if the GND(chassis) is equal to 0V and the
metal plate of
78xx is directly connected to chassis for better cooling, then the R2 is
by-passed
through the internal connection of 78xx. (and the R1 is now just a...
bleeder !)
Finally, in this combination by using divider (or diodes as mentioned by
others)
the 78xx regulators lose the "short-circuit" output protection. That is
available
only in case where the Pin2 of 78xx is directly connected to 0V (normal
connection).
Hope this helps.
73, Mak SV1BSX
----- Original Message -----
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
To: <amsat-bb(AT)amsat.org>
Sent: Sunday, August 17, 2008 2:54 AM
Subject: [amsat-bb] G-5500 7806 regulator question
> Hello All,
>
> It appears that the 7806 voltage regulator in my Yaesu G-5500 control box
> has gone bad; the output is measuring more like 10.8 Volts (!). This
> explains why both position indicators were off by a factor of 2 (e.g.,
> elevation meter showing 90 deg, array pointing 45; azimuth meter showing
> 180 deg, but array pointing 90 deg., and so on).
>
> Question---has anybody used a 7805 to replace the 7806 regulator in this
> control box?
>
> I don't have a 7806....so this brings the next question--anybody have a
> 7806 (or 2) that they want to sell?)
>
> Thanks,
>
> Mark L. Hammond [N8MH]
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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(AT)amsat.org. 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 3, Issue 419
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