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CX2SA > SATDIG 16.03.12 21:10l 696 Lines 21332 Bytes #999 (0) @ WW
BID : AMSATBB788
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Subj: AMSAT-BB-digest V7 88
Path: IZ3LSV<IW0QNL<VE2PKT<F1BBI<CX2SA
Sent: 120316/1903Z @:CX2SA.SAL.URY.SA #:54632 [Salto] FBB7.00e $:AMSATBB788
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. VUCC #227 (saguaroastro@xxx.xxxx
2. Re: VUCC #227 (Ted)
3. Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On' (i8cvs)
4. CO-65 schedule in March (Mineo Wakita)
5. Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On' (PE0SAT)
6. Dutch transponder versus the Indian transponder.
(Ib Christoffersen)
7. Re: Dutch transponder versus the Indian transponder. (i8cvs)
8. Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On'
(Mani VU2WMY)
9. Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On'
(David Palmer KB5WIA)
10. Re: Dutch transponder versus the Indian transponder.
(Michael Lipp, HB9WDF)
11. Re: Dutch transponder versus the Indian transponder. (i8cvs)
12. Re: VUCC #227 (Jim Adams)
13. CO6CBF/p FL02 again (Hector Luis Martinez Sis)
14. Re: VUCC #227 (saguaroastro@xxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Thu, 15 Mar 2012 18:45:13 -0400
From: <saguaroastro@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] VUCC #227
Message-ID: <20120315184513.F74KR.7788.imail@xxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
All,
I just received my VUCC satellite Award today. Certificate # 227.
Thanks to all who worked me over the past two years to get me here.
I'm gonna need a bigger frame!
73
Rick
K7TEJ
------------------------------
Message: 2
Date: Thu, 15 Mar 2012 16:08:40 -0700
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: <saguaroastro@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: VUCC #227
Message-ID: <094CDA637D8E44C58B08B545F402BC23@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Congrats Rick !!
73, Ted
#226
K7TRK
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of saguaroastro@xxx.xxx
Sent: Thursday, March 15, 2012 3:45 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] VUCC #227
All,
I just received my VUCC satellite Award today. Certificate # 227.
Thanks to all who worked me over the past two years to get me here.
I'm gonna need a bigger frame!
73
Rick
K7TEJ
_______________________________________________
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: Fri, 16 Mar 2012 09:33:46 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Greg D" <ko6th.greg@xxxxx.xxx>, "Mani VU2WMY" <wmy@xxxx.xxx.xx>
Cc: RANGAN <tprangan@xxxxxx.xxx>, "BB, AMSAT" <amsat-bb@xxxxx.xxx>,
PE1RAH <pe1rah@xxxxx.xxx>, VU3TYG <vu3tyg@xxxxx.xx.xx>
Subject: [amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52
'Turned On'
Message-ID: <000001cd034f$d5bac7e0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Greg, KO6TH
In my opinion one lesson the satellite community can learn from this,
is that if we want to communicate a satellites should be designed with
only one mode and with redundant transponders i.e. "strong and stupid"
BTW after working few orbits it seems to me that the indian transponder
was less subject to be overloaded in comparison to the Dutch transponder.
If the EIRP is too high and there are many station in the passband the
Dutch transponder is FMing and get distorted while the indian transponder
was more linear and less subject to be overloaded.
If the uplink power is in the order of 10 to 20 watt into a 10 dBi RHCP
antenna than the Dutch transponder is not overloaded.
I agree with you that it will be very interesting to know from ISRO if the
difference in linearity between the above transponders is due to the actual
battery conditions or to a different performance of the AGC
73" de
i8CVS Domenico
----- Original Message -----
From: "Greg D" <ko6th.greg@xxxxx.xxx>
To: "Mani VU2WMY" <wmy@xxxx.xxx.xx>
Cc: "RANGAN" <tprangan@xxxxxx.xxx>; "AMSAT-INDIA"
<amsatindia@xxxxxxxxxxx.xxx>; "VUHAMS" <vuhams@xxxxxxxxxxx.xxx>; "PE1RAH"
<pe1rah@xxxxx.xxx>; "BB,AMSAT" <amsat-bb@xxxxx.xxx>; "VU3TYG"
<vu3tyg@xxxxx.xx.xx>
Sent: Thursday, March 15, 2012 4:05 AM
Subject: [amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On'
> Hi Mani,
>
> Congratulations on the recovery of VO-52; it's great to have our friend
> back.
>
> I am curious if ISRO will be issuing some sort of report on what
> happened. I understand that they will have limits on what they can say,
> but if there is something the satellite community can learn from this,
> it would be good to not miss the opportunity.
>
> Greg KO6TH
>
>
> Mani VU2WMY wrote:
> > Dear HAMSAT VO-52 users,
> > The commands to 'Turn On' the transponder # 2 (Dutch transponder, made
> > by Williams PE1RAH) on-board HAMSAT VO-52 was successfully sent during
> > 14:00 UT 35 deg ascending Node pass over Bangalore, India.
> >
> > The sent commands were successfully received, acknowledged and
> > confirmed by the telemetry. Subsequently, the transponder # 2 is now
> > 'ON' and Williams CW message beacon was heard again after a gap of
> > approximately 6 years & 4 months.
> >
> > The beacon signal was heard loud and strong here at Bangalore.
> >
> >
> >
> > A detailed Initial reports addressed to:
> > tprangan@xxxxxx.xxx
> > and a copy to
> > wmy@xxxx.xxx.xx
> > would be greatly appreciated.
> >
> >
> > 73 de
> >
> > Mani, VU2WMY
> > Secretary & Station-In-Charge
> > Upagrah Amateur Radio Club VU2URC
> > ISRO Satellite Centre
> > HAL Airport Road, Bangalore-560 017.
> > Phone:(O)91-80-25082054/2598/2192
> > Mobile: 91-80-98803 41456
> > E-mail ID: wmy@xxxx.xxx.xx
> > vu2wmy_mani@xxxxx.xxx
> > isrohams@xxxxx.xxx
> >
> >
>
> --------------------------------------------------------------------------
----
> >
> > Confidentiality Notice: This e-mail message, including any
> > attachments, is for
> > the sole use of the intended recipient(s) and may contain confidential
> > and
> > privileged information. Any unauthorized review, use, disclosure or
> > distribution is prohibited. If you are not the intended recipient,
please
> > contact the sender by reply e-mail and destroy all copies of the
original
> > message.
>
> --------------------------------------------------------------------------
----
> >
> >
> > _______________________________________________
> > 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-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Fri, 16 Mar 2012 18:46:04 +0900
From: "Mineo Wakita" <ei7m-wkt@xxxxxxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] CO-65 schedule in March
Message-ID: <436CB7072E784E7AAE601AF1EE8B87B1@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-2022-jp";
reply-type=original
Ground Station of CO-65 announces it as follows.
> This is information of operation schedule change in March 2012.
>
> At present, it is difficult to perform the satellite operation like former
> because this laboratory moved the other day. And the operative situation
> largely changed, so we modified the operation schedule in March as
follows....
>
> * Mission operations (APD observation etc...) are not performed.
> * Digipeter is always open.
>
> Please check detail of passes from the following website.
> URL(Japanese) :
http://lss.mes.titech.ac.jp/ssp/cute1.7/operationschedule.html
>
> When we will rechange the schedule of operation again, we will inform
about it
> in this blog. Thank you for your understanding.
> URL(Japanese) : http://lss.mes.titech.ac.jp/ssp/cute1.7/blog/
I, JE9PEL think that Digipeater is always open via JQ1YTC all over the world,
uplink 1267.600MHz / downlink 437.475MHz, 9600bps FSK.
http://www.ne.jp/asahi/hamradio/je9pel/ct17gmsk.htm
JE9PEL, Mineo Wakita
------------------------------
Message: 5
Date: Fri, 16 Mar 2012 11:00:59 +0100
From: "PE0SAT" <pe0sat@xxxxx.xx>
To: "i8cvs" <domenico.i8cvs@xxx.xx>
Cc: RANGAN <tprangan@xxxxxx.xxx>, PE1RAH <pe1rah@xxxxx.xxx>, "BB,
AMSAT" <amsat-bb@xxxxx.xxx>, VU3TYG <vu3tyg@xxxxx.xx.xx>
Subject: [amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52
'Turned On'
Message-ID: <20120316100059.37F721A18A@xx.xxxxx.xx>
Content-Type: text/plain;charset=iso-8859-1
On Fri, March 16, 2012 09:33, i8cvs wrote:
Hi,
> BTW after working few orbits it seems to me that the indian transponder
> was less subject to be overloaded in comparison to the Dutch transponder.
>
> If the EIRP is too high and there are many station in the passband the
> Dutch transponder is FMing and get distorted while the indian transponder
> was more linear and less subject to be overloaded.
>
> If the uplink power is in the order of 10 to 20 watt into a 10 dBi RHCP
> antenna than the Dutch transponder is not overloaded.
I experience the same, last night during the pass from 7:22 p.m. UTC
there was an overload on the uplink and therefor it was impossible to
use the passband efficient. I also experienced linearity problems.
So please reduce power to a minimum - if the transponder is clogged no one
benefits.
> I agree with you that it will be very interesting to know from ISRO if
> the difference in linearity between the above transponders is due to the
> actual battery conditions or to a different performance of the AGC
>
> 73" de i8CVS Domenico
73 Jan PE0SAT
--
With regards PE0SAT
Internet web-page http://www.pe0sat.vgnet.nl/
------------------------------
Message: 6
Date: Fri, 16 Mar 2012 11:36:25 +0100
From: "Ib Christoffersen" <oz1my@xxxxxx.xx>
To: <pe0sat@xxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Dutch transponder versus the Indian transponder.
Message-ID: <0467141DE5D1493F989A900A74AEBE09@xxx.xx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
The two transponders are not built exactly the same way.
The Indian transponder has an AGC - but according to my memory Williams
transponder has a diode limiter.
I think that can be the difference.
In theory the AGC will regulate the gain down so that the "stronger" station
"drowns" the ones with a lower uplink signal.
The diode limiter will of course limit the signal for the strong stations -
but also create distortion in a broad frequency range for all stations.
That is if there is a very strong signal - or many stations at the same
time.
Whatever the reason KEEP THE POWER DOWN
73 OZ1MY/Ib
------------------------------
Message: 7
Date: Fri, 16 Mar 2012 12:14:22 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Ib Christoffersen" <oz1my@xxxxxx.xx>, <pe0sat@xxxxx.xx>,
<pe1rah@xxxxx.xxx>
Cc: Amsat - BBs <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Dutch transponder versus the Indian
transponder.
Message-ID: Hi all,
> The two transponders are not built exactly the same way.
>
> The Indian transponder has an AGC - but according to my memory Williams
> transponder has a diode limiter.
>
> I think that can be the difference.
>
> In theory the AGC will regulate the gain down so that the "stronger"
station
> "drowns" the ones with a lower uplink signal.
>
> The diode limiter will of course limit the signal for the strong
stations -
> but also create distortion in a broad frequency range for all stations.
> That is if there is a very strong signal - or many stations at the same
> time.
>
> Whatever the reason KEEP THE POWER DOWN
>
> 73 OZ1MY/Ib
>
> _______________________________________________
> 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: 8
Date: Fri, 16 Mar 2012 18:10:04 +0530
From: Mani VU2WMY <wmy@xxxx.xxx.xx>
To: Greg D <ko6th.greg@xxxxx.xxx>
Cc: "BB, AMSAT" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52
'Turned On'
Message-ID: <201203161240.q2GCe9gI010841@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed"
Dear Greg,
You are very right in all your aspects.
1. We are still in the process of documenting the recent HAMSAT VO-52
Anomaly Analysis and Transponder-2 Switch ON Report.
2 The report will not be complete without the feedback from the user
(HAM) community. Hence, we have decided to circulate, very soon a
feedback format, at least to all those who have sent us their initial
reports.
3 Right now, we are not in a position to share anything with the
users.However, once the formal analysis report is approved and
released, your request , will be forwarded (justifying that such
information will help in future amateur radio satellite ventures) to
the Management for further advise.
Dear Greg, we hope you understand our position and limitations.
73 de
Mani VU2WMY
Quoting Greg D <ko6th.greg@xxxxx.xxx>:
> Hi Mani,
>
> Congratulations on the recovery of VO-52; it's great to have our friend
back.
>
> I am curious if ISRO will be issuing some sort of report on what
> happened. I understand that they will have limits on what they can
> say, but if there is something the satellite community can learn
> from this, it would be good to not miss the opportunity.
>
> Greg KO6TH
------------------------------------------------------------------------------
Confidentiality Notice: This e-mail message, including any attachments, is for
the sole use of the intended recipient(s) and may contain confidential and
privileged information. Any unauthorized review, use, disclosure or
distribution is prohi-------------------------------------------
------------------------------
Message: 9
Date: Fri, 16 Mar 2012 06:40:34 -0700
From: David Palmer KB5WIA <kb5wia@xxxxx.xxx>
To: i8cvs <domenico.i8cvs@xxx.xx>
Cc: "BB, AMSAT" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52
'Turned On'
Message-ID:
<CAO-vtPNS3Hnp5czBDrktojVyO0DVu8SzSUwdkDd=GYPzzPaUPw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
> If the uplink power is in the order of 10 to 20 watt into a 10 dBi RHCP
> antenna than the Dutch transponder is not overloaded.
Yes, it's important not to run too much power to prevent overloading. I
have found that just 300 mW into a 16 dBi vertically polarized antenna
works beautifully through most of the pass, during the last few days. Not
much power is needed at all.
73 de Dave KB5WIA
------------------------------
Message: 10
Date: Fri, 16 Mar 2012 14:47:16 +0100
From: "Michael Lipp, HB9WDF" <hb9wdf@xxxxxxx.xx>
To: i8cvs <domenico.i8cvs@xxx.xx>
Cc: Amsat - BBs <amsat-bb@xxxxx.xxx>, "<pe1rah@xxxxx.xxx>"
<pe1rah@xxxxx.xxx>
Subject: [amsat-bb] Re: Dutch transponder versus the Indian
transponder.
Message-ID: <4C841917-FA3B-46B6-A4FD-097D6175EF6C@xxxxxxx.xx>
Content-Type: text/plain; charset=us-ascii
Hi Domenico
I think we have also another problem: In the last few years, the OP's
growing up without fullduplex TRX (Ic-706 and similar) and use the ssb sat.
They can't hear her own downlink signal from the bird.
73's de Michael
HB9WDF, Michael Lipp, JN47AE
Am 16.03.2012 um 12:14 schrieb "i8cvs" <domenico.i8cvs@xxx.xx>:
> Hi Ib, OZ1MY and William, PE1RAH
>
> Thank you for the information about the diode limiter into the William's
> transponder.
>
> I got the link of PE1RAH describing the block diagram of indian and Duch
> transponders but without information about AGC or diode limiter.
>
> http://www.qsl.net/pe1rah/HAMSAT-info.htm
>
> I hope that William will informe us on this matter.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Ib Christoffersen" <oz1my@xxxxxx.xx>
> To: <pe0sat@xxxxx.xx>
> Cc: <amsat-bb@xxxxx.xxx>
> Sent: Friday, March 16, 2012 11:36 AM
> Subject: [amsat-bb] Dutch transponder versus the Indian transponder.
>
>
>> Hi all,
>> The two transponders are not built exactly the same way.
>>
>> The Indian transponder has an AGC - but according to my memory Williams
>> transponder has a diode limiter.
>>
>> I think that can be the difference.
>>
>> In theory the AGC will regulate the gain down so that the "stronger"
> station
>> "drowns" the ones with a lower uplink signal.
>>
>> The diode limiter will of course limit the signal for the strong
> stations -
>> but also create distortion in a broad frequency range for all stations.
>> That is if there is a very strong signal - orersus the Indian transponder.
Hi Domenico
I think we have also another problem: In the last few years, the OP's
growing up without fullduplex TRX (Ic-706 and similar) and use the ssb sat.
They can't hear her own downlink signal from the bird.
73's de Michael
HB9WDF, Michael Lipp, JN47AE
Am 16.03.2012 um 12:14 schrieb "i8cvs" <domenico.i8cvs@xxx.xx>:
> Hi Ib, OZ1MY and William, PE1RAH
>
> Thank you for the information about the diode limiter into the William's
> transponder.
>
> I got the link of PE1RAH describing the block diagram of indian and Duch
> transponders but without information about AGC or diode limiter.
>
> http://www.qsl.net/pe1rah/HAMSAT-info.htm
>
> I hope that William will informe us on this matter.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Ib Christoffersen" <oz1my@xxxxxx.xx>
> To: <pe0sat@xxxxx.xx>
> Cc: <amsat-bb@xxxxx.xxx>
> Sent: Friday, March 16, 2012 11:36 AM
> Subject: [amsat-bb] Dutch transponder versus the Indian transponder.
>
>
>> Hi all,
>> The two transponders are not built exactly the same way.
>>
>> The Indian transponder has an AGC - but according to my memory Williams
>> transponder has a diode limiter.
>>
>> I think that can be the difference.
>>
>> In theory the AGC will regulate the gain down so that the "stronger"
> >station "drowns" the ones with a lower uplink signal.
>>
>> The diode limiter will of course limit the signal for the strong
> stations -
>> but also create distortion in a broad frequency range for all stations.
>> That is if there is a very strong signal - or many stations at the same
>> time.
>>
>> Whatever the reason KEEP THE POWER DOWN
>>
>> 73 OZ1MY/Ib
>>
>> _______________________________________________
>> 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-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Fri, 16 Mar 2012 10:49:25 -0600
From: Jim Adams <jim9251@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: VUCC #227
Message-ID:
<CAD6RR8hM++y8vnOCk8t7NVuOuFy3Qe+0BVt+DDfGa1qq+jMiYw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Congrats! It's a really nice certificate isn't it?
Jim - K0BAM
VUCC # 209
------------------------------
Message: 13
Date: Fri, 16 Mar 2012 13:20:56 -0400 (EDT)
From: "Hector Luis Martinez Sis" <hmartinez@xxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] CO6CBF/p FL02 again
Message-ID: <2050.10.14.32.18.1331918456.squirrel@xxxxxx.xxx.xxx.xx>
Content-Type: text/plain;charset=utf-8
Hello Guys!
Tomorrow morning, my girlfriend and I will go to Villa Clara province in
FL02. I hope to
be operating on the AO-27 and SO-50 passes until Sunday when we will come
back.
As you know, the birds are very busy because of Yuri ?s operation; anyway if
you need
this grid confirmed, please contact me off the list and we will try it.
73!
Hector, CO6CBF
***************************************
Genius is one per cent inspiration,
and ninety-nine per cent
perspiration.
-- Thomas A. Edison
***************************************
---
Consulte la Enciclopedia Colaborativa Cubana
http://www.ecured.cu/
------------------------------
Message: 14
Date: Fri, 16 Mar 2012 13:59:35 -0400
From: <saguaroastro@xxx.xxx>
To: amsat-bb@xxxxx.xxxx Jim Adams <jim9251@xxxxx.xxx>
Subject: [amsat-bb] Re: VUCC #227
Message-ID: <20120316135935.C10M4.21797.imail@xxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Yes it is, bigger than the frame I had ready for it as well. :)
Thanks for the grids you gave me as well Jim. Always good to work you.
73
Rick
K7TEJ
---- Jim Adams <jim9251@xxxxx.xxx> wrote:
> Congrats! It's a really nice certificate isn't it?
>
> Jim - K0BAM
> VUCC # 209
> _______________________________________________
> Sent via AMSAT-BB@xt.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 7, Issue 88
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