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CX2SA > SATDIG 21.04.10 18:02l 1023 Lines 31075 Bytes #999 (0) @ WW
BID : AMSATBB5181
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Path: IZ3LSV<IW0QNL<IK6ZDE<IR4U<CX2SA
Sent: 100421/1657Z @:CX2SA.LAV.URY.SA #:54917 [Minas] FBB7.00e $:AMSATBB5181
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. NH6VB on HO-68 (John Neeley)
2. For sale, Yaesu VX-3R HT, ARR RF switched pre amp
(Michael Tondee)
3. Re: AO-51 V/S (Bob- W7LRD)
4. Re: Arecibo on 432 MHz Moon Bounce (some calculations) (Fabio A)
5. Re: AO-51 V/S (Luc Leblanc)
6. Re: AO-51 V/S (Auke de Jong, VE6PWN)
7. VO52 OK?? (John Geiger)
8. Re: Arecibo on 432 MHz Moon Bounce (some calculations) (Mateusz)
9. HAMSAT Transponder Performance and Utilization - Reg.
(Mani VU2WMY)
10. Re: Arecibo on 432 MHz Moon Bounce (some calculations)
(Fabio Azzarello)
11. Re: Arecibo on 432 MHz Moon Bounce (some calculations)
(Nigel Gunn G8IFF/W8IFF)
12. Re: HAMSAT Transponder Performance and Utilization - Reg.
(Elan Portnoy)
13. Re: HAMSAT Transponder Performance and Utilization - Reg.
(Mark L. Hammond)
14. XE1AO @ DK88 on AO-27 today (Patrick STODDARD (WD9EWK/VA7EWK))
15. NASA Photos of Icelandic Plume (Clint Bradford)
----------------------------------------------------------------------
Message: 1
Date: Tue, 20 Apr 2010 12:45:52 -0700 (PDT)
From: John Neeley <w6zkh@xxx.xxx>
Subject: [amsat-bb] NH6VB on HO-68
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <79233.89933.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
This last pass of HO-68 over the Pacific produced another Hawaiian station,
Peter, NH6VB. Leo, W7JPI and I were in QSO and at the last 5 minutes of the
pass, Peter broke in from Honolulu which was a surprise. He is a local
there from what we gathered. He's in BL01 grid square.
John W6ZKH
------------------------------
Message: 2
Date: Tue, 20 Apr 2010 17:19:26 -0400
From: Michael Tondee <mat_62@xxxxxxxxxxxx.xxx>
Subject: [amsat-bb] For sale, Yaesu VX-3R HT, ARR RF switched pre amp
To: amsat-bb@xxxxx.xxx
Message-ID: <4BCE1A5E.9000604@xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have for sale a Yaesu VX-3R dual band HT. While it is not full duplex,
it works well as the RX side of a mode J handheld station. I've had it
less than six months if even that long. It has never even been outside
the house and is in like new condition.
Of course box, manual, charger and stock rubber duck are all included.
I'll also throw in a 3ft. long adapter cable that goes from the SMA jack
on the radio to an SO-239 where an external antenna can be used. Price
is $110.00 shipped priority mail in the lower 48.
The pre amp is an Advanced Receiver Research SP432VDG with N
connectors. The RF switching circuit is rated at 25 watts, I actually
only ever used it on a receive only setup with the VX-3R. The pre amp
has been mast mounted in a weatherproof enclosure. ARR says these units
will withstand heat and cold extremes with no problem, they just have to
be mounted in a waterproof enclosure if put outside. As with the HT the
unit has seen very little use and is like new. Price is $85.00 shipped
priority mail in the lower48.
I will accept Paypal or a United States Postal Service money order as
payment. Sorry, no international shipping.
If you are interested, please contact me off list.
Thanks for the bandwidth everyone,
Michael, W4HIJ
------------------------------
Message: 3
Date: Tue, 20 Apr 2010 17:38:07 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 V/S
To: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Cc: amsat-bb@xxxxx.xxxx eu-amsat@xxxxxxxxxxx.xxx
Message-ID:
<1277757034.8032541271785087508.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxx
xx.xxx>
Content-Type: text/plain; charset=utf-8
Hi Luc and all
I am using a Transystem 3731AA downconverter.??Also an old Kenwood TS-700A
for the tunable IF.? I have compared Keps 13LNC-PH downconverter against the
3731.? The 3731 is virtually immune to desense to 2M tx as well as wifi
etc.? However the Keps (pricey) is affected by the 2M tx.? Without the noise
blanker turned on in the TS-700 I get lots of snapping, popping from
wireless phones, wifi etc.? The noise blanker in this old 700 is superb,
better that the one in my 910!? Go figure!? Mind you this is all empirical
evaluation using nothing but my ears.? I have heard the filter in the 3731
is better than most.? I will be shipping some of my dc's soon to a fellow
who can give a very accurate evaluation on these devices.? Hope this helps
Luc, see you on S band!
73 Bob W7LRD
----- Original Message -----
From: "Luc Leblanc" <lucleblanc6@xxxxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Sent: Tuesday, April 20, 2010 6:14:17 AM GMT -08:00 US/Canada Pacific
Subject: [amsat-bb] Re: AO-51 V/S
On 20 Apr 2010 at 2:24, Bob- W7LRD wrote:
Date sent: ? ? ?????????Tue, 20 Apr 2010 02:24:55 +0000 (UTC)
From: ? ? ? ? ? ????????Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: ? ? ? ?????????[amsat-bb] ?AO-51 V/S
To: ? ? ? ? ? ? ????????amsat-bb@xxxxx.xxx
>
>
> This last pass worked W6YX and heard Kerry, WC7V.? Noticed some very deep
fades.
>
> 73 Bob W7LRD
Did anyone ever tested their downconverter who is basically a receiver to
measure the amouint of desense the WI-FI , spread spectrum and
frequency hopper device and so on produce on 2.4Ghz?
Desense is very noticeable on VHF and UHF when a transmitter is transmitting
near a receiver as per i can see on a PCR-1000 scope screen
there is always a 10db noise floor but i'm not sure if this level is not
really much higher as the scope seems to not be fast enough to
display the real peak level of all the signal on 2.4Ghz.
If a fairly high amount of desense is always present this could explain why
the downconverter is lacking sensitivity and why some normal
fades appears deeper than they really are. And what is worse is the WI-FI
QRM is also right on the received 2.4Ghz amateur band.
Here i have to switch off my WI-FI router and my 2.4Ghz camera when i want
to listen on 2.4Ghz and the camera is the worse as she give 30
over 9 very wide ?spread signal.
Opinions are welcome.
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
?
_______________________________________________
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: Tue, 20 Apr 2010 20:26:01 +0200
From: Fabio A <iw8qku@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
To: AMSAT-BB@xxxxx.xxx
Message-ID:
<x2h2b3cc8c11004201126ve69f03d2he8b89298f2dfb072@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello all,
just a curiosity, how did you found that the ERP is "... 243,902,443 Million
Watts".
Thanks
73s
Fabio
iw8qku
----- Original Message -----
From: "MM" <ka1rrw@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, April 07, 2010 3:06 PM
Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce
> Hi all:
> Here is a EME event you cant miss.
> Dust off your CW key, its time for Satellite, QRP EME.
>
> The 1,000 foot dish has 60 dBi on 432 mc and 400 watts.
> That comes out to be approximately 243,902,443 Million Watts ERP.
>
> enjoy
>
> wf1f
> www.marexgm.org
>
> (thanks to KB1MGI for passing on this data)
>
>
> Arecibo on 432 MHz Moon Bounce
>
> The Arecibo Observatory Amateur Radio Club will be putting the
> 1000-foot radio telescope on the air for 432 MHz EME from April 16-18.
>
> It can be heard with a small hand-held yagi pointed at the moon
>
> The scheduled times of operation are:
>
> April 16: 1645 - 1930 UTC
>
> April 17: 1740 - 2020 UTC
>
> April 18: 1840 - 2125 UTC
>
> Callsign: KP4AO
>
> Tx Frequency: 432.045 MHz
>
> Rx Frequency: 432.050 to 432.060+
>
> Tx power: 400 W
>
> Antenna gain: 60 dBi
>
> System noise temp: 120 K (cold sky)
>
> System noise temp: 330 K (when pointed at moon)
>
> KP4AO can be heard with a small hand-held yagi pointed at the moon and a
> good receiver. A 15 dBi antenna and 100 W will be enough to work us on
> CW.
>
> Operators at KP4AO will do their best to work as many stations as
> possible. Each session will start with a brief announcement and CQ in
> SSB. SSB QSOs may continue for 30 minutes to an hour, if the QSO rate
> remains high.
>
> The mode will be shifted to CW as soon as it is judged that higher QSO
> rates would result.
>
> We will listen for calls at frequencies 5-15 kHz higher than our own,
> and even higher if QRM warrants. Callers who s-p-r-e-a-d o-u-t are more
> likely to be copied.
>
> If you've already worked us in any mode, please do not call again --
> give others a chance.
>
> If we call "CQ QRP", we will listen for stations running 100 W or less
> to a single yagi. Please do not answer such a CQ if you are running more
> power or have a larger antenna.
>
> On April 18, if we reach a condition where most calling stations have
> been worked, and we judge that operating in the digital mode JT65B would
> produce a higher QSO rate, we will switch to JT65B.
>
> Note that any of these planned operating strategies may be changed as
> circumstances dictate.
>
> We are extremely fortunate to have been granted access to the world's
> largest radio telescope for this amateur radio good-will event. We look
> forward to working as many stations as possible in the alloted time!
>
> >From QRZ.COM
>
> KB1MGI
...snip...
------------------------------
Message: 5
Date: Tue, 20 Apr 2010 14:28:50 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: AO-51 V/S
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <4BCDBA22.4734.142E89C@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1
On 20 Apr 2010 at 17:38, Bob- W7LRD wrote:
Date sent: Tue, 20 Apr 2010 17:38:07 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: Re: [amsat-bb] Re: AO-51 V/S
To: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Copies to: eu-amsat@xxxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
>
>
> Hi Luc and all
>
>I am using a Transystem 3731AA downconverter.??Also an old Kenwood TS-700A
for the tunable IF.? I have compared Keps 13LNC-PH
downconverter against the 3731.
>The 3731 is virtually immune to desense to 2M tx as well as wifi etc.?
However the Keps (pricey) is affected by the 2M tx.? Without the
>noise blanker turned on in the TS-700 I get lots of snapping, popping from
wireless phones, wifi etc.? The noise blanker in this old 700
>is superb, better that the one in my 910!? Go figure!? Mind you this is all
empirical evaluation using nothing but my ears.? I have heard
>the filter in the 3731 is better than most.? I will be shipping some of my
dc's soon to a fellow who can give a very accurate evaluation
>on these devices.? Hope this helps Luc, see you on S band!
>
> 73 Bob W7LRD
>
>
Hi Bob
I have the same DC but my IF is on 123mhz and i got no desense at all on 2M
but that's the 2.4Ghz RF your "snapping, popping" who i think
is could be reducing the RF sensitivity of the DC. The AIDC was design to
received MMDS TV where channels where isolated from each other
and they was no other QRM on the original band this downconverter was design
for. How he's performing on a band full of QRM that i don't
know and it will be something to test to see if the DC keep his same
sensitivity when is QRMed on 2.4Ghz.
Adding some sort of flitration is could be a way to reduce any 2.4Ghz
desense if any and what the noise blanker does is to suppress the
pops and clicks but he cannot reduce the overall QRM level.
Our regular Ham receiver can be tweaked for the best reception possible but
with a DC we are stuck with a static passband, no way to reduce
the RF level and so on.
I don't know how wide the AIDC 3731AA front end was but to be able to
receive TV signals it should be quite wide and he should pass a lot
more than 15KC?
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 6
Date: Tue, 20 Apr 2010 13:34:28 -0600
From: "Auke de Jong, VE6PWN" <sparkycivic@xxxx.xx>
Subject: [amsat-bb] Re: AO-51 V/S
To: "Luc Leblanc" <lucleblanc6@xxxxxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <001101cae0c0$7e079810$6700a8c0@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
In my sub-urban QTH, I can hear nothing EXCEPT wifi noise starting right at
2401.025MHz in all directions. I'm planning to optimise my BBQ grill/3733
antenna in order to improve off-axis rejection, and hopefully the noise -
without having too sharp of pattern for manual tracking of AO-51. I'm also
contemplating ditching the BBQ grill reflector in favor or a small dish to
get better f/b and cut the noise. It makes me wish that satellites would
stick closer to 2400MHz such as AO-40- it's less noisy there.
73
Auke
----- Original Message -----
From: "Luc Leblanc" <lucleblanc6@xxxxxxxxx.xx>
To: <amsat-bb@xxxxx.xxx>
Cc: <eu-amsat@xxxxxxxxxxx.xxx>
Sent: Tuesday, April 20, 2010 7:14 AM
Subject: [amsat-bb] Re: AO-51 V/S
On 20 Apr 2010 at 2:24, Bob- W7LRD wrote:
Date sent: Tue, 20 Apr 2010 02:24:55 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] AO-51 V/S
To: amsat-bb@xxxxx.xxx
>
>
> This last pass worked W6YX and heard Kerry, WC7V. Noticed some very deep
> fades.
>
> 73 Bob W7LRD
Did anyone ever tested their downconverter who is basically a receiver to
measure the amouint of desense the WI-FI , spread spectrum and
frequency hopper device and so on produce on 2.4Ghz?
Desense is very noticeable on VHF and UHF when a transmitter is transmitting
near a receiver as per i can see on a PCR-1000 scope screen
there is always a 10db noise floor but i'm not sure if this level is not
really much higher as the scope seems to not be fast enough to
display the real peak level of all the signal on 2.4Ghz.
If a fairly high amount of desense is always present this could explain why
the downconverter is lacking sensitivity and why some normal
fades appears deeper than they really are. And what is worse is the WI-FI
QRM is also right on the received 2.4Ghz amateur band.
Here i have to switch off my WI-FI router and my 2.4Ghz camera when i want
to listen on 2.4Ghz and the camera is the worse as she give 30
over 9 very wide spread signal.
Opinions are welcome.
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
_______________________________________________
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
------------------------------------------------------------------------------
--
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.801 / Virus Database: 271.1.1/2822 - Release Date: 04/20/10
00:31:00
------------------------------
Message: 7
Date: Tue, 20 Apr 2010 20:43:28 -0700 (PDT)
From: John Geiger <aa5jg@xxxxx.xxx>
Subject: [amsat-bb] VO52 OK??
To: amsat-bb@xxxxx.xxx
Message-ID: <635772.71284.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Is VO52 doing ok? Got on a pass a few minutes ago (0330Z) which was a long
lasting one here (80 degrees max elevation) and called CQ repeatedly.
Didn't hear a single other station on.
73s JOhn AA5JG
------------------------------
Message: 8
Date: Wed, 21 Apr 2010 08:45:08 +0200
From: "Mateusz" <sq7dqx@xxxxxx.xxxx.xx>
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
To: "Fabio A" <iw8qku@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <972520409A184AD69609E6AB26BBB94D@xx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
60dBi is abt 57dB
It means 10exp5,7
ERP was 400x10exp5,7 W
----- Original Message -----
From: "Fabio A" <iw8qku@xxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Sent: Tuesday, April 20, 2010 8:26 PM
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
> Hello all,
> just a curiosity, how did you found that the ERP is "... 243,902,443
> Million
> Watts".
>
> Thanks
>
> 73s
> Fabio
> iw8qku
>
> ----- Original Message -----
> From: "MM" <ka1rrw@xxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Wednesday, April 07, 2010 3:06 PM
> Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce
>
>
>> Hi all:
>> Here is a EME event you cant miss.
>> Dust off your CW key, its time for Satellite, QRP EME.
>>
>> The 1,000 foot dish has 60 dBi on 432 mc and 400 watts.
>> That comes out to be approximately 243,902,443 Million Watts ERP.
>>
>> enjoy
>>
>> wf1f
>> www.marexgm.org
>>
>> (thanks to KB1MGI for passing on this data)
>>
>>
>> Arecibo on 432 MHz Moon Bounce
>>
>> The Arecibo Observatory Amateur Radio Club will be putting the
>> 1000-foot radio telescope on the air for 432 MHz EME from April 16-18.
>>
>> It can be heard with a small hand-held yagi pointed at the moon
>>
>> The scheduled times of operation are:
>>
>> April 16: 1645 - 1930 UTC
>>
>> April 17: 1740 - 2020 UTC
>>
>> April 18: 1840 - 2125 UTC
>>
>> Callsign: KP4AO
>>
>> Tx Frequency: 432.045 MHz
>>
>> Rx Frequency: 432.050 to 432.060+
>>
>> Tx power: 400 W
>>
>> Antenna gain: 60 dBi
>>
>> System noise temp: 120 K (cold sky)
>>
>> System noise temp: 330 K (when pointed at moon)
>>
>> KP4AO can be heard with a small hand-held yagi pointed at the moon and a
>> good receiver. A 15 dBi antenna and 100 W will be enough to work us on
>> CW.
>>
>> Operators at KP4AO will do their best to work as many stations as
>> possible. Each session will start with a brief announcement and CQ in
>> SSB. SSB QSOs may continue for 30 minutes to an hour, if the QSO rate
>> remains high.
>>
>> The mode will be shifted to CW as soon as it is judged that higher QSO
>> rates would result.
>>
>> We will listen for calls at frequencies 5-15 kHz higher than our own,
>> and even higher if QRM warrants. Callers who s-p-r-e-a-d o-u-t are more
>> likely to be copied.
>>
>> If you've already worked us in any mode, please do not call again --
>> give others a chance.
>>
>> If we call "CQ QRP", we will listen for stations running 100 W or less
>> to a single yagi. Please do not answer such a CQ if you are running more
>> power or have a larger antenna.
>>
>> On April 18, if we reach a condition where most calling stations have
>> been worked, and we judge that operating in the digital mode JT65B would
>> produce a higher QSO rate, we will switch to JT65B.
>>
>> Note that any of these planned operating strategies may be changed as
>> circumstances dictate.
>>
>> We are extremely fortunate to have been granted access to the world's
>> largest radio telescope for this amateur radio good-will event. We look
>> forward to working as many stations as possible in the alloted time!
>>
>> >From QRZ.COM
>>
>> KB1MGI
>
> ...snip...
> _______________________________________________
> 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: 9
Date: Wed, 21 Apr 2010 13:30:08 +0530
From: Mani VU2WMY <wmy@xxxx.xxx.xx>
Subject: [amsat-bb] HAMSAT Transponder Performance and Utilization -
Reg.
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>, AMSAT-INDIA
<amsatindia@xxxxxxxxxxx.xxx>, VUHAMS <vuhams@xxxxxxxxxxx.xxx>
Message-ID: <20100421133008.42784fht63is8eq0@xxxxxxxx.xxxx.xxx.xxx.xx>
Content-Type: text/plain; charset=UTF-8
Dear friends,
On behalf of the Programme Director, Mission Director, Operations Director
and the entire "HAMSAT" project team, I convey their message to the Global
Amateur Radio Satellite enthusiasts & users through my mail.
It gives us a great pleasure to inform the World Amateur Radio
community that, on 4th May 2010, HAMSAT (VO-52) is completing 5 years of
successful existence in Space rendering useful and fruitful services to the
Amateur radio community.
We as well take this opportunity with great pleasure to inform the
Global Amateur Radio community, that the overall system health and
performance of "Hamsat" - "The gift from INDIA/ISRO to World of Ham Radio"
is good and satisfactory.
To commemorate this mile stone achievement, we have intended to bring out
a 'Comprehensive Performance & Utilization Report' of the payload
(Transponder) based on the user feed backs from across the Globe. In this
regard, we request all the Amateur Satellite Enthusiasts and users to kindly
send us their feed backs about the performance and utilization of the
transponder. A detailed report expressing their views, suggestions,
comments, ratings and preferably a comparison note made with other linear
transponders, those already been flown and currently available one's would
be greatly appreciated.
The feed backs may kindly be copied to my mail ID as well.
I have herewith attached the mail received from Operation Director, HAMSAT.
Looking forward to hear from you all.
Thanking you
73 de
Mani, VU2WMY
Secretary & Station-In-Charge
Upagrah Amateur Radio Club VU2URC
ISRO Satellite Centre
Airport Road, Bangalore-560 017.
Phone:(O)91-80-2508 2054/2192/2537
Mobile: 91-80-98803 41456
E-mail ID: wmy@xxxx.xxx.xx
vu2wmy_mani@xxxxx.xxx
isrohams@xxxxx.xxx
----- Forwarded message from tprangan@xxxxxx.xxx -----
Date: Wed, 21 Apr 2010 10:00:58 +0530
From: tprangan@xxxxxx.xxx
Reply-To: tprangan@xxxxxx.xxx
Subject: HAMSAT Transponder Performance and Utilization - Reg.
To: wmy@xxxx.xxx.xx
Cc: tprangan@xxxxxx.xxx
DEAR MR. SUBRAMANAI,
This is to bring to your kind attention that HAMSAT is COMPLETING 5 YEARS of
successful existence in space. I am sure, HAMSAT continues to be the DARLING
of the HAM Community.
To commemorate this event, ISTRAC is bringing out a "5-YEARS OF HAMSAT
PERFORMANCE" Report. To make the report a comprehensive one, we would like
to add the FOLLOWING INFORMATION.
1 PERFORMANCE of the HAMSAT TRANSPONDER as _perceived by the users_
2 COMPARISON of the HAMSAT Transponder with her CONTEMPORARIES
3 Details of SATELLITES providing SIMILAR SERVICES
4 Approximate NUMBER OF USERS of HAMSAT in _India / over the globe_
5 GROWTH of HAMSAT USERS, since launch
6 Approximate HAMSAT TRANSPONDER UTILISATION (transponder interaction
period) over the globe (transponder is ON always)
7 Any more INTERESTING INFORMATION on HAMSAT
KINDLY _DO THE NEEDFUL_ BY CIRCULATING THIS REQUEST TO OUR HAM FRIENDS.
With Best Regards,
T.PARIMALARANGAN
Operations Director
HAMSAT
0-9480333563 (M)
080-22029011 (O)
080-25350132 (R)
----- End forwarded message -----
------------------------------
Message: 10
Date: Wed, 21 Apr 2010 13:46:41 +0200
From: Fabio Azzarello <iw8qku@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
To: amsat-bb@xxxxx.xxx
Message-ID:
<s2v2b3cc8c11004210446q50ed7999na8a31797532be960@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello,
thanks for the reply, but now I have another question.
I'm not good enough with those numbers!
If the calculated ERP is about 243 MW... which derives from changing from
dBi to dBd (60dBi - 2.14),
the part I don't understand is:
"*Since the given ERP is 243,902,443 Million Watts (see below)
and since 60 dB is equivalent to 1000000 (one Million) time in
power it comes out that the power reaching the feed of the dish is:
243902443 / 1000000 = 243 watt
The rest of the power 400-243 = 157 watt is lost in the feed line.*"
How do they have feeder losses?
thanks in advance,
73s
Fabio
iw8qku
On Wed, Apr 21, 2010 at 8:45 AM, Mateusz <sq7dqx@xxxxxx.xxxx.xx> wrote:
>
> 60dBi is abt 57dB
> It means 10exp5,7
> ERP was 400x10exp5,7 W
>
> ----- Original Message ----- From: "Fabio A" <iw8qku@xxxxx.xxx>
> To: <AMSAT-BB@xxxxx.xxx>
> Sent: Tuesday, April 20, 2010 8:26 PM
> Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
>
>
> Hello all,
>> just a curiosity, how did you found that the ERP is "... 243,902,443
>> Million
>> Watts".
>>
>> Thanks
>>
>> 73s
>> Fabio
>> iw8qku
>>
>> ----- Original Message -----
>> From: "MM" <ka1rrw@xxxxx.xxx>
>> To: <amsat-bb@xxxxx.xxx>
>> Sent: Wednesday, April 07, 2010 3:06 PM
>> Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce
>>
>>
>> Hi all:
>>> Here is a EME event you cant miss.
>>> Dust off your CW key, its time for Satellite, QRP EME.
>>>
>>> The 1,000 foot dish has 60 dBi on 432 mc and 400 watts.
>>> That comes out to be approximately 243,902,443 Million Watts ERP.
>>>
>>> enjoy
>>>
>>> wf1f
>>> www.marexgm.org
>>>
>>> (thanks to KB1MGI for passing on this data)
>>> ... snip ...
>>>
>>
------------------------------
Message: 11
Date: Wed, 21 Apr 2010 12:00:02 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
To: Fabio Azzarello <iw8qku@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4BCEE8C2.9090504@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
The anomoly you see is because the 60dB gain given is dBi and the "real"
gain used to calculate the power is dBd (gain
referenced to a dipole and not isotropic). The difference is around 2.4dB.
On 21-Apr-10 11:46, Fabio Azzarello wrote:
> Hello,
> thanks for the reply, but now I have another question.
> I'm not good enough with those numbers!
>
> If the calculated ERP is about 243 MW... which derives from changing from
> dBi to dBd (60dBi - 2.14),
> the part I don't understand is:
>
> "*Since the given ERP is 243,902,443 Million Watts (see below)
> and since 60 dB is equivalent to 1000000 (one Million) time in
> power it comes out that the power reaching the feed of the dish is:
> 243902443 / 1000000 = 243 watt
>
> The rest of the power 400-243 = 157 watt is lost in the feed line.*"
>
> How do they have feeder losses?
> thanks in advance,
>
> 73s
> Fabio
> iw8qku
>
>
>
> On Wed, Apr 21, 2010 at 8:45 AM, Mateusz<sq7dqx@xxxxxx.xxxx.xx> wrote:
>
>>
>> 60dBi is abt 57dB
>> It means 10exp5,7
>> ERP was 400x10exp5,7 W
>>
>> ----- Original Message ----- From: "Fabio A"<iw8qku@xxxxx.xxx>
>> To:<AMSAT-BB@xxxxx.xxx>
>> Sent: Tuesday, April 20, 2010 8:26 PM
>> Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
>>
>>
>> Hello all,
>>> just a curiosity, how did you found that the ERP is "... 243,902,443
>>> Million
>>> Watts".
>>>
>>> Thanks
>>>
>>> 73s
>>> Fabio
>>> iw8qku
>>>
>>> ----- Original Message -----
>>> From: "MM"<ka1rrw@xxxxx.xxx>
>>> To:<amsat-bb@xxxxx.xxx>
>>> Sent: Wednesday, April 07, 2010 3:06 PM
>>> Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce
>>>
>>>
>>> Hi all:
>>>> Here is a EME event you cant miss.
>>>> Dust off your CW key, its time for Satellite, QRP EME.
>>>>
>>>> The 1,000 foot dish has 60 dBi on 432 mc and 400 watts.
>>>> That comes out to be approximately 243,902,443 Million Watts ERP.
>>>>
>>>> enjoy
>>>>
>>>> wf1f
>>>> www.marexgm.org
>>>>
>>>> (thanks to KB1MGI for passing on this data)
>>>> ... snip ...
>>>>
>>>
> _______________________________________________
> 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
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.814 / Virus Database: 271.1.1/2825 - Release Date: 04/21/10
06:31:00
>
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC,
GCARES, XWARN.
------------------------------
Message: 12
Date: Wed, 21 Apr 2010 06:59:48 -0700 (PDT)
From: Elan Portnoy <elanportnoy@xxxxx.xxx>
Subject: [amsat-bb] Re: HAMSAT Transponder Performance and Utilization
- Reg.
To: amsat-bb@xxxxx.xxx
Message-ID: <293983.8147.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I wonder if we might design a form for submission regarding 52's perceived
health. If you all want to forward some items to include, I would be glad to
brew something up and present it to the list.
------------------------------
Message: 13
Date: Wed, 21 Apr 2010 11:08:23 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: HAMSAT Transponder Performance and Utilization
- Reg.
To: Elan Portnoy <elanportnoy@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<g2r5d8cecfe1004210808u51901c91r13c39d68ed048bd8@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
This page is helpful for matters such as this:
http://oscar.dcarr.org/
73,
Mark N8MH
On Wed, Apr 21, 2010 at 9:59 AM, Elan Portnoy <elanportnoy@xxxxx.xxx> wrote:
> I wonder if we might design a form for submission regarding 52's perceived
health. If you all want to forward some items to include, I would be glad to
brew something up and present it to the list.
> _______________________________________________
> 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
>
--
Mark L. Hammond [N8MH]
------------------------------
Message: 14
Date: Wed, 21 Apr 2010 08:40:28 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] XE1AO @ DK88 on AO-27 today
To: amsat-bb@xxxxx.xxx
Message-ID: <203165.39008.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Omar XE1AO will be in grid DK88 for the AO-27 pass at 2050 UTC
today. Omar did not mention if he would use his normal call or
4B1AO with the special prefix XE hams are allowed to use this
year.
Good luck and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 15
Date: Wed, 21 Apr 2010 09:35:27 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] NASA Photos of Icelandic Plume
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <D48688E4-5B96-4E4C-9113-829389CF06A8@xxx.xxx>
Content-Type: text/plain; charset=us-ascii
NASA Observes Ash Plume of Icelandic Volcano -
http://tinyurl.com/y5ucox7
Clint Bradford, K6LCS
------------------------------
_______________________________________________
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 5, Issue 181
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