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CX2SA > SATDIG 31.07.13 21:00l 366 Lines 13005 Bytes #999 (0) @ WW
BID : AMSATBB8248
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Subj: AMSAT-BB-digest V8 248
Path: IZ3LSV<IK2XDE<ON4HU<CX2ACB<CX2SA
Sent: 130731/1902Z @:CX2SA.SAL.URY.SA #:9194 [Salto] FBB7.00e $:AMSATBB8248
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: V/U Linear Transponder (Tanan Rangseeprom HS1JAN)
2. Alpha Spid Big-RAS AZ & EL Rotator (Sion Chow Q. C. (9W2QC))
3. Re: Alpha Spid Big-RAS AZ & EL Rotator (Stefan Wagener)
4. AO7 mode switch (K4FEG)
5. Re: AO7 mode switch (Paul Stoetzer)
----------------------------------------------------------------------
Message: 1
Date: Wed, 31 Jul 2013 07:24:32 +0700
From: "Tanan Rangseeprom HS1JAN" <hs1jan@xxxxxx.xxx>
To: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>,
<bilgi@xxxxxx.xxx.xx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: V/U Linear Transponder
Message-ID: <014CF7DFF1A14D8282751ABC369E931E@xxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Dear Andrew Glasbrenner and All
We had mail to bilgi@xxxxxx.xxx.xx but do not have respond feedback. if you
have detail e-mail or contact list of turksat team please advice to me.
best Regards
Tanan Rangseeprom HS1JAN
----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: "Tanan Rangseeprom HS1JAN" <hs1jan@xxxxxx.xxx>
Cc: "PE1RDW" <sats@xxxxxx.xxxxx.xx>; <g0mrf@xxx.xxx>; <hs2jfw@xxxxx.xxx>;
<hs5igy@xxxxxxx.xxx>; <chawalit@xxxxxxx.xx.xx>; <thidad1@xxxxx.xxx>
Sent: Wednesday, July 31, 2013 12:08 AM
Subject: Re: [amsat-bb] Re: V/U Linear Transponder
You may want to reach out to the turksat 3U team. Although the satellite has
has problems, I believe it has redundant v/u transponders on board.
73, Drew KO4MA
Sent from my iPhone
On Jul 30, 2013, at 12:04 PM, "Tanan Rangseeprom HS1JAN" <hs1jan@xxxxxx.xxx>
wrote:
> Dear All
>
> Thanks respond for help to me
>
> 1.Thailand has regular to forbid for transmitt UHF band but can receive
> the signal for amateur radio satellites only. we need to used VHF band
> same like transponder of Japanes (FO-29) , AmSat AO-51 , Saudiarabia
> SO-50 and other satellites. for interference from China Thailand and other
> countries on VHF is normal.
>
> 2.Ok, I do not have knowledge 100 khz bandwidth is too much for the over
> power. please advice me for 30 khz uplink 145.90-145.92 MHz VHF / 435.10 -
> 435.12 MHz UHF of liner transponder.
>
> 3.We have to design FM repeater use to modify HX1 / RX2A RADIOMETRIX VHF /
> UHF transmitter module we have change x-tal to 145.90 MHz / 13.59 MHz and
> used MC3361 with x-tal 10.245 MHz and CML IC FX465 CTCSS Encode/Decode
> build test it to be successful.
>
> We and technical team of TAMSAT group would like to help and advice for
> circuit diagram of V/U transponder same like transponder of Japanes
> (FO-29) and other satellites. We had mail to Mr.William Leijenaar PE1RAH
> but do not have respond feedback. Mrs Thida of 100watts ham radio magazine
> of thailand sugges me to know Mr.William.because she meet him on Tokyo ham
> fair 2009.
>
> On this time we and technical team of TAMSAT group need help very urgent.
> we need advice of circuit diagram or datasheet IC for build V/U Liner
> transponder for payload 1U cubesat of JAISAT satellite project.
>
> best regards
>
> Tanan Rangseeprom HS1JAN
> Project Manager of JAISAT-1
> member of RAST
> email : hs1jan@xxxxxx.xxx
>
>
> ----- Original Message ----- From: <g0mrf@xxx.xxx>
> To: <hs1jan@xxxxxx.xxx>
> Sent: Monday, July 29, 2013 5:24 PM
> Subject: Re: [amsat-bb] V/U Linear Transponder
>
>
> Dear Tanan.
>
> Thanks for the mail via AMSAT.org
>
> My name is David Bowman G0MRF and I'm a member of the team building
> FUNcube, due for launch this November.
>
> I can help with transponder design, but there are some points which you
> need to consider.
>
> 1) The use of V band for the uplink will be a poor choice for your
> location. The interference from China and other countries on 145MHz
> will mean the transponder will not be usable. Using U band for the
> uplink is a much better choice.
>
> 2) The 100kHz bandwidth is too much for the typical power available
> from a CubeSat. If you get your RF team to do a link budget analysis,
> you will see the cubesat power budget will not support 100kHz of
> bandwidth. Ususally 30kHz is as much as you can do with a 1U cube.
>
> 3) You may want to consider a FM 'repeater' as there is now only 1 in
> orbit, while there are several linear transponder satellites ready to
> be launched.
> The FM design will allow you to run a very efficient power amplifier
> (70%) and power can be saved over oceans and areas of low population by
> using a 67Hz access tone (CML FX465)
>
> I can assist with design but would need to know if you are planning a
> 1U 2U or 3U design.
>
> William PE???? is good, but will probably just offer to sell you a
> transponder.
>
> Regards
>
> David G0MRF
>
> some old info is available at www.g0mrf.com/transponder.htm
>
> The attached powerpoint has some pictures of the UV transponder and
> other boards in FUNcube from AMSAT-UK
> _______________________________________________
> 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: 2
Date: Wed, 31 Jul 2013 04:11:31 -0400
From: "Sion Chow Q. C. (9W2QC)" <9w2qc@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Alpha Spid Big-RAS AZ & EL Rotator
Message-ID: <20130731041131.10772ytteqys7tus@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"
Dear All,
I understand that the Alpha Spid Big-RAS AZ & EL Rotator requires 4
control cables each for it Azimuth and Elevation control.
However, I am not able to find out if the connector on the outdoor
rotator end consist of 2 separate connectors for the AZ and EL motor
(like the Yaesu G-5500) or if they are connected all together at one
point. Also would be great if someone could advice if the connection
point consists of screw on terminals or some kind of connector plug is
used.
This is in preparation of ISS HAM TV reception and would like to
understand the above before deciding if I should purchase this rotor.
Thank you.
73,
Sion Chow Q. C.,
9M2CQC, WQ2C
------------------------------
Message: 3
Date: Wed, 31 Jul 2013 06:52:23 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: "Sion Chow Q. C. (9W2QC)" <9w2qc@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Alpha Spid Big-RAS AZ & EL Rotator
Message-ID:
<CAKu8kHBus=FaLEWq66b26k0tx3d7WBrvdvOTOPzMsMyYO=fisg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Sion,
Look at the images at:
http://www.rfhamdesign.com/products/antennerotor/bigrashr/index.html
there is one picture with the terminal box open on the rotor. Also, the
rotors are now available with a high resolution option (0.1 degree). If you
get a new one, might as well do that. We are planning on doing the same for
a station here in Winnipeg. Also, compare prices for the rotor. Even with
shipping and taxes the above mentioned source is still far less expensive
then anyone in NA.
Hope that helps,
Stefan VE4NSA
On Wed, Jul 31, 2013 at 3:11 AM, Sion Chow Q. C. (9W2QC)
<9w2qc@xxxxx.xxx>wrote:
> Dear All,
>
> I understand that the Alpha Spid Big-RAS AZ & EL Rotator requires 4
> control cables each for it Azimuth and Elevation control.
>
> However, I am not able to find out if the connector on the outdoor rotator
> end consist of 2 separate connectors for the AZ and EL motor (like the
> Yaesu G-5500) or if they are connected all together at one point. Also
> would be great if someone could advice if the connection point consists of
> screw on terminals or some kind of connector plug is used.
>
> This is in preparation of ISS HAM TV reception and would like to
> understand the above before deciding if I should purchase this rotor.
>
> Thank you.
>
> 73,
> Sion Chow Q. C.,
> 9M2CQC, WQ2C
>
> ______________________________**_________________
> 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<http://amsat.org/mailman/listinfo
/amsat-bb>
>
------------------------------
Message: 4
Date: Wed, 31 Jul 2013 11:31:38 -0500
From: K4FEG <K4FEG@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AO7 mode switch
Message-ID: <51F93BEA.2000507@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello Satellite People;
it is my opinion that we are quickly approaching the end of the Eclipse
Cycle for AO7 this season. I had previously estimated the "final"
eclipse to be on August the 2nd between 0200 and 0300 UTC but upon
closer check with fresh Kep's it looks like the eclipse durations are
decreasing by approximately 10 seconds per orbit at this time and with
the current durations of the orbits the final eclipse of 20 seconds will
end at 21:00:50UTC, when the satellite is rising over Australia.
I would guess that at that point the 24 hour mode switch will begin once
the satellite is in full illumination once again. It appears to have
been 9 full weeks of eclipse's for AO7 and over 98% of the time it
seemed to come up in Mode B, I know there were reports over Europe of a
Mode A pass on individual orbits and I had noted the same for the USA as
well, but once the satellite had gone into eclipse on the next orbital
pass it would come back up in Mode B.
In May of 2014 I hope to look at the beginning of the Eclipse Cycle and
work at predicting the beginning and end of it better.
This has been a fun exercise for me and I appreciate those from around
the world that forwarded their observations to me.
Now it is time to sit and wait to see if the switches start back on
August 2, 2013 at @xxxxxxxx
73 ALL FRM
K4FEG
EM55aj84ta
------------------------------
Message: 5
Date: Wed, 31 Jul 2013 13:25:50 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: K4FEG <K4FEG@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO7 mode switch
Message-ID:
<CABzOSOp_0Gprky5kA8xUojD955sFEQAKNg-zKYyDaskKDeWF=w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I know there was some question as to why the satellite comes up in Mode B
nearly all of the time after coming out of eclipse.
The "AMSAT-OSCAR 7 Technical Operator's Plan And Experimenter's Guide"
found starting on page 75 of this PDF (
http://ka9q.net/AMSAT-Newsletter-1974.pdf) says that the clock
automatically switches the satellite to Mode B at 0000 GMT. If the clock is
reset by eclipse to 0000, it stands to reason that it would always come up
in Mode B out of eclipse.
The satellite apparently knows somehow that it hasn't just been launched
since it's designed to come up with only the 70cm beacon operating after
launch.
73,
Paul, N8HM
On Wed, Jul 31, 2013 at 12:31 PM, K4FEG <K4FEG@xxxxx.xxx> wrote:
> Hello Satellite People;
>
> it is my opinion that we are quickly approaching the end of the Eclipse
> Cycle for AO7 this season. I had previously estimated the "final" eclipse
> to be on August the 2nd between 0200 and 0300 UTC but upon closer check
> with fresh Kep's it looks like the eclipse durations are decreasing by
> approximately 10 seconds per orbit at this time and with the current
> durations of the orbits the final eclipse of 20 seconds will end at
> 21:00:50UTC, when the satellite is rising over Australia.
>
> I would guess that at that point the 24 hour mode switch will begin once
> the satellite is in full illumination once again. It appears to have been 9
> full weeks of eclipse's for AO7 and over 98% of the time it seemed to come
> up in Mode B, I know there were reports over Europe of a Mode A pass on
> individual orbits and I had noted the same for the USA as well, but once
> the satellite had gone into eclipse on the next orbital pass it would come
> back up in Mode B.
>
> In May of 2014 I hope to look at the beginning of the Eclipse Cycle and
> work at predicting the beginning and end of it better.
>
> This has been a fun exercise for me and I appreciate those from around the
> world that forwarded their observations to me.
>
> Now it is time to sit and wait to see if the switches start back on August
> 2, 2013 at @xxxxxxxx
>
> 73 ALL FRM
> K4FEG
> EM55aj84ta
> ______________________________**_________________
> 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<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 8, Issue 248
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