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CX2SA > SATDIG 17.08.08 23:41l 344 Lines 10390 Bytes #999 (0) @ WW
BID : 26576_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 420
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<CX2SA
Sent: 080817/2135Z @:CX2SA.LAV.URY.SA #:26576 [Minas] FBB7.00e $:26576_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Compass-1 16:05 pass (Bob DeVarney W1ICW)
2. Re: G-5500 7806 regulator question (Raul Romero CA3SOC)
3. PCSat (Fred VE3FAL)
4. WG: Compass-1 recovery efforts (Mike Rupprecht)
5. Re: DIY: Parabolic mirror (Greg D.)
----------------------------------------------------------------------
Message: 1
Date: Sun, 17 Aug 2008 12:17:01 -0400
From: Bob DeVarney W1ICW <we1u(AT)verizon.net>
Subject: [amsat-bb] Compass-1 16:05 pass
To: amsat-bb(AT)amsat.org
Message-ID: <48A84EFD.8080603(AT)verizon.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Nothing heard on this pass, sent the commands blindly a number of times
but received no confirmation this time.
Bob W1ICW
--
------------------------------
Message: 2
Date: Sun, 17 Aug 2008 13:21:47 -0400
From: "Raul Romero CA3SOC" <ce3soc(AT)gmail.com>
Subject: [amsat-bb] Re: G-5500 7806 regulator question
To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "AMSAT-BB" <amsat-bb(AT)amsat.org>,
"Mark L. Hammond" <n8mh(AT)embarqmail.com>
Message-ID: <49066EB3974A4A91BD2A72BA42ED21E7(AT)p42800>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
or you insert two diode rectifier in4001 or 1n4007 both ground 7805 and
ground
one diode rectifier up 0.5 volt for 2 diode 1 volt up
sorry for my bad english
Raul
ce3soc
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----- Original Message -----
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>; "Mark L. Hammond"
<n8mh(AT)embarqmail.com>
Sent: Saturday, August 16, 2008 9:56 PM
Subject: [amsat-bb] Re: G-5500 7806 regulator question
> ----- 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
>
>
>
>
>
>
>
> _______________________________________________
> 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: Sun, 17 Aug 2008 13:23:54 -0400
From: "Fred VE3FAL" <flesnick(AT)tbaytel.net>
Subject: [amsat-bb] PCSat
To: "'amsat'" <amsat-bb(AT)amsat.org>
Message-ID: <004701c9008e$05f99ad0$bd00a8c0(AT)radioroom>
Content-Type: text/plain; charset="US-ASCII"
Seen a few folks during the last week have made it into PCSat.I have heard
signals coming down but very weak for my vertical.
Have tried shot gunning to see if I get in but no luck so far. VE3FFR has
made it over the last week.
Fred
VE3FAL
------------------------------
Message: 4
Date: Sun, 17 Aug 2008 20:10:56 +0200
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
Subject: [amsat-bb] WG: Compass-1 recovery efforts
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <000301c90094$9865fbb0$c931f310$(AT)de>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob and all,
thats really great - good news :-)
Now we have 3 successfully contacts. But it seems, the battery voltage is
too low for the beacon. The only thing we can do is to try it again and
again - and waiting for more illumination (end of august).
Every reset of COMPASS will set the initial values and the heater will be
switched on.
So we need a good pass and switch the heater off when it came out out the
eclipse. Maybe the time until the next eclipse is long enough to load the
batteries and COMPASS remain alive during the next eclipse.
Thank you very much for all your efforts. I am so glad that we have friends
around the world :-)
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
Auftrag von Bob DeVarney W1ICW
Gesendet: Sonntag, 17. August 2008 16:38
An: amsat-bb(AT)amsat.org
Betreff: [amsat-bb] Compass-1 recovery efforts
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!
--
_______________________________________________
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!
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------------------------------
Message: 5
Date: Sun, 17 Aug 2008 11:39:48 -0700
From: "Greg D." <ko6th_greg(AT)hotmail.com>
Subject: [amsat-bb] Re: DIY: Parabolic mirror
To: mvm <amvm(AT)skynet.be>
Cc: "amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <BLU133-W760CFED992433797B0253A96F0(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
That's the idea, though "DIY" is just a little bit of a stretch... :-)
Greg KO6TH
----------------------------------------
> Date: Sun, 17 Aug 2008 14:27:59 +0200
> From: amvm(AT)skynet.be
> To: ko6th_greg(AT)hotmail.com
> CC: amsat-bb(AT)amsat.org
> Subject: Re: [amsat-bb] Re: DIY: Parabolic mirror
>
> 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-
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>> _______________________________________________
>> 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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------------------------------
_______________________________________________
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 420
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