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CX2SA > SATDIG 02.06.13 21:02l 1090 Lines 37021 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: ISS Bounce on 1296 MHz (i8cvs)
2. Re: ISS -Bounce on 1296 MHz ( easy calculation using RADAR
equation ) (i8cvs)
3. ANS-153 AMSAT News Service Weekly Bulletins (Lee McLamb)
4. Invitation to connect on LinkedIn (Aayush Yadav)
5. help with M^2 2MCP22 (Nick Pugh)
6. Re: Pegaso update via Google translate (M5AKA)
7. Re: Pegaso update via Google translate (jlv)
8. SO-50 pass from FN54 (Rick - WA4NVM)
9. Tilting Yagi up 15 degrees above horizon (Rick Walter)
10. Re: Tilting Yagi up 15 degrees above horizon (Greg D)
----------------------------------------------------------------------
Message: 1
Date: Sun, 2 Jun 2013 02:54:13 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS Bounce on 1296 MHz
Message-ID: <000001ce5f2c$0bbc1b80$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Domenico,
Thanks for your interest in the ISS reflections
Now about your questions.
1. I started calling Andreas as soon as my dish could see ISS.
That was on May 23 at 8 degrees elevation.
So the distance would have been close to 2000 km at that time.
Andreas reports that he heard me right from the beginning!
Own echo's is not possible because the time is too short
2. We heard the strongest signals when ISS was right overhead. In my case
that was at about 60 degrees elevation.
Distance probably somewhere around 500 km?
On the SDR recording from Andreas we can see the signal peaking 20 dB
over the noise and sometimes even a bit more.
3. We both used analog CW but we both listened in the SSB passband (approx.
2.5 kHz) to have some margin of error is case our Doppler compensation
was not 100% OK.
But once I found Andreas I did not touch the RIT of my rig anymore
during the QSO. Doppler compensation worked fantastic!
We hope to try other modes in future. FSK441 but also JT65 in 30 sec period
mode, and when ISS is overhead probably SSB is possible
I am also involved in the restoration of the 25 m Dwingeloo dish PI9CAM (see
www.camras.nl)
And the dish will be on air in a few months from now (I hope)
We hope to experiment with passive satellite reflection there.
ISS will be the start and with the dish having 48 dB gain it will be
possible with QRP
But maybe it's possible with other low orbiting satellites too....
To be continued!
73!
Jan
PA3FXB
Hello Jan, PA3FXB
It is very interesting that you heard the strongest signals
when the ISS was right overhead and that in your case that
was at about 60 degrees elevation with distance from the
ISS somewhere around 500 km and that in the SDR recording
from Andreas you can see the signal peaking +20 dB over the
noise and sometimes even a bit more.
It is also interesting that both of you were using analog
CW and both listened in the SSB passband (approx. 2.5 kHz)
As you can see looking at my previous budged calculations
the expected S/N ratio on CW was +6.9 dB using a receiving
bandwidth of 500 Hz on CW
It is possible that my calculations showed a less level in
ratio S/N = +6.9 dB in comparison to your received +20 dB
because for calculation with the RADAR equation I have
used a reflection factor for the ISS of only 10% wich in
reality is very low because for the Moon we use a
reflection factor of 7% but the Moon is made of stone and
not a metallic reflecting object like the ISS.
Considering that the ISS is made almost of metallic structural
material as well for supporting the solar panels and considering
that the efficiency of a metallic parabolic dish is never better
than 50% I have uptodate my previous link budged calculation
using a reflection factor of 50% for the ISS and as you can read
belove the S/N ratio at a distance of 700 km jumped up to +17dB
over the noise !
This means that your experimental investigation receiving +20 dB
match well with my calculation showing +17 dB and for the future
we can consider that a reflection factor for the ISS of 50% is a real
figure to be used.
Since you live in a quite location the antenna temperature at
1296 MHz when aimed toward the Cold Sky can be only 5 degrees
kelvin instead of the previously estimated 50 degrees kelvin
so that the overall Noise Floor of your receiving system
decreases by 3.29 dB
Read please the following revised calculations using a ISS
reflection factor of 50% instead of 10% at a range of 700 km
and 5 degrees kelvin for the equivalent antenna temperature Ta
instead of 50 kelvin
LINK BUDGED CALCULATIONS by i8CVS
We consider the ISS like a passive reflector with reflectivity
factor of 50 % to try a QSO by reflection Earth-ISS-Earth
DATA:
1) The solar panels of the ISS plus the central body large like a
Boeing 747 have a metallic reflecting surface of about
2000 square meters and we consider the ISS like a circular
RADAR target having being a metallic plate an estimated
reflectivity factor S of 50 % at SHF
2) The range EARTH-ISS at elevation of 35 degrees is about
700 km
3) Our EME station at 1296 MHz uses a 3 meters dish in diameter
with gain of 29 dB and 200 W at the feed
4) The overall noise figure of our receive system is NF = 0.5 dB
while the antenna temperature is 5 kelvin when pointed at the
Cold Sky and we receive on CW using a filter with a BW large
500 Hz
5) We use only analogic reception without digital software like
WSJT or similar tecniques.
CALCULATION PROCEDURE :
Aiming the dish towards the ISS when distant 700 km and
transmitting on CW and using the RADAR equation we
calculate the Signal to Noise ratio S/N to see if on CW the
echoes reflected by the ISS are above or belove the Noise
Floor of receiver.
First of all using the RADAR equation we calculate the round
trip attenuation in dB between EARTH-ISS-EARTH when
approaching to TCA the average range is 700 km
RADAR EQUATION
Pt x Gt x Ar x S
Pr = -----------------------------
( 4 x 3.14 x R^2 ) ^2
Where :
Pr = power received in watt
Pt = power transmitted = 1 watt
Gt = isotropic gain of a ground antenna at 1296 MHz = 1 time
in power or 0 dB
Ar = aperture area of isotropic antenna at 1296 MHz = 0,0043
square meters
S = Sigma or Radar Cross Section i.e. the surface of the ISS in
square meters with reflecting coefficient of 0.50 = 50 %
R = distance or range EARTH-ISS = 700 km = 700000 meters
NOTE:
(4 x 3.14 x R^2)^2 calculates the surface of a sphere having a
radius R=700000 meters squared 2 to take account of the
round trip "EARTH-ISS-EARTH"
CALCULATION OF ATTENUATION "EARTH-ISS-EARTH" :
S = Sigma of the ISS with reflecting surface of 2000 square meters
and reflection coefficient of 50 % = 2000 x 0.50 = 1000 square meters
Calculation of the aperture area Ar of isotropic antenna at 1296 MHz
/ 2 2
/\ 0,2314
Ar = ---------- = ----------- = 0,0043 square meters
4 x 3,14 4 x 3,14
Calculation of the received power Pr on the EARTH
collected by the isotropic antenna at 1296 MHz
1 x 1 x 0.0043 x 1000 -25
Pr = --------------------------------- = 1.13 x 10 watt
(4 x 3.14 x 700000^2 )^2
Calculation of the attenuation Att for the Round-Trip
EARTH-ISS-EARTH
Pt (1watt)
24
Att = --------------------- = 8.81 x 10 time in power
-25
1.13 x 10 watt
24
and in dB the Att = 10 log 8.81 x 10 = 249.5 dB
10
CALCULATION OF THE OVERALL NOISE FLOOR
FOR THE RECEIVER :
Data of the 1296 MHz receiving system :
Overall Noise Figure of receiving system NF= 0.5 dB = 35 kelvin
Bandwidth BW of receiver on CW = 500 Hz
Equivalent Noise Temperature Ta of the antenna when aimed toward
the Cold Sky = 5 kelvin
Calculation to get the Noise Floor KTB of receiver
Where :
-23
K = Boltzmann constant = 1,38 x 10 joule/kelvin
T = Equivalent noise temperature Ta of the antenna plus the
equivalent Noise Temperature Te of receiver i.e. T= (Ta + Te)
Computation of the overall Noise Factor F for the receiver
F = 10 ^ (NF/10) and so F = 10 ^(0,5 / 10) = 10 ^0,05 = 1,12
in factor
The equivalent overall Noise Temperature Te of the receiver is
Te = ( F-1) x 290 = (1,12 -1) x 290 = 35 kelvin
The overall Noise Floor KTB of the receiving system with the
antenna connected is :
KTB = K x ( Te + Ta ) x BW and in numbars :
-23
Noise Floor KTB = 1,38 x 10 x ( 35 + 5 ) x 500 = -185.5 dBW
LINK CALCULATION "round trip" EARTH -ISS-EARTH at 1296 MHz
on CW
TX power at feed.................................+23 dBW = 200 watt
Antenna Gain in TX................. ...........+29 dBi
------------
EIRP transmitted to the ISS. ..............+52 dBW = 158.5 kW
Attenuation EARTH-ISS-EARTH... - 249.5 dB
-------------
Power Pr received on EARTH over
isotropic antenna ............................ - 197.5 dBW
Antenna Gain in RX......................... + 29 dB
------------
Power incident at receiver input ...... - 168.5 dBW
RX Noise Floor......................... ........- 185.5 dBW
------------
S/N ratio CW at RX audio output... + 17.0 dB
CONCLUSION :
At a range of 700 km from the ISS and using a 3 meters dish with
200 W at the feed and a receiving system with a Noise Floor of
-185.5 dBW = - 155.5 dBm it is possible to hear your hown echo
signals in plain analogic CW with a Signal to Noise ratio S/N of
+17.0 dB wich is very strong.
If two stations are equipped with the same equipments it is
possible to make good QSO for a short time when the ISS
is close range around 700 km at elevation of about 35
degrees.
Increasing the BW of receiver at 2700 Hz to try receive SSB
it is possible since 10 time log (2700/500) = 7.3 dB and
+17 dB - (+7.3 dB ) = +9.7 dB and so the signal scattered back
by the ISS in SSB will have a S/N ratio of about + 9.7 dB
i.e. well over the Noise Floor of your receiver.
It is necessary to use a precise traking system particularly fast
to move the dish as soon the ISS approach the TCA because
the beam wide of a 3 meter dish with gain of 29 dB is large
only about 5 degrees at the -3 dB points so that traking the
ISS at 1296 MHz with a 3 meter dish or even larger for EME
it seems to be the more critical point of the experiment.
73" de
i8CVS Domenico
------------------------------
Message: 2
Date: Sun, 2 Jun 2013 03:19:30 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Cc: PA3FXB Jan van Muijlwijk <jvmmap@xxxx.xx>, Andreas Imse
<andreas@xxxx.xx>
Subject: [amsat-bb] Re: ISS -Bounce on 1296 MHz ( easy calculation
using RADAR equation )
Message-ID: <000001ce5f2f$892184e0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: Jan van Muijlwijk
To: i8cvs
Sent: Friday, May 31, 2013 9:51 AM
Subject: Re: .[amsat-bb] Re: International Space Station-Bounce on 1296 MHz
Hi Domenico,
Thanks for your interest in the ISS reflections
Now about your questions.
1. I started calling Andreas as soon as my dish could see ISS.
That was on May 23 at 8 degrees elevation.
So the distance would have been close to 2000 km at that time.
Andreas reports that he heard me right from the beginning!
Own echo's is not possible because the time is too short
2. We heard the strongest signals when ISS was right overhead. In my case
that was at about 60 degrees elevation.
Distance probably somewhere around 500 km?
On the SDR recording from Andreas we can see the signal peaking 20 dB
over the noise and sometimes even a bit more.
3. We both used analog CW but we both listened in the SSB passband (approx.
2.5 kHz) to have some margin of error is case our Doppler compensation
was not 100% OK.
But once I found Andreas I did not touch the RIT of my rig anymore
during the QSO. Doppler compensation worked fantastic!
We hope to try other modes in future. FSK441 but also JT65 in 30 sec period
mode, and when ISS is overhead probably SSB is possible
I am also involved in the restoration of the 25 m Dwingeloo dish PI9CAM (see
www.camras.nl)
And the dish will be on air in a few months from now (I hope)
We hope to experiment with passive satellite reflection there.
ISS will be the start and with the dish having 48 dB gain it will be
possible with QRP
But maybe it's possible with other low orbiting satellites too....
To be continued!
73!
Jan
PA3FXB
Hello Jan, PA3FXB
It is very interesting that you heard the strongest signals
when the ISS was right overhead and that in your case that
was at about 60 degrees elevation with distance from the
ISS somewhere around 500 km and that in the SDR recording
from Andreas you can see the signal peaking +20 dB over the
noise and sometimes even a bit more.
It is also interesting that both of you were using analog
CW and both listened in the SSB passband (approx. 2.5 kHz)
As you can see looking at my previous budged calculations
the expected S/N ratio on CW was +6.9 dB using a receiving
bandwidth of 500 Hz on CW
It is possible that my calculations showed a less level in
ratio S/N = +6.9 dB in comparison to your received +20 dB
because for calculation with the RADAR equation I have
used a reflection factor for the ISS of only 10% wich in
reality is very low because for the Moon we use a
reflection factor of 7% but the Moon is made of stone and
not a metallic reflecting object like the ISS.
Considering that the ISS is made almost of metallic structural
material as well for supporting the solar panels and considering
that the efficiency of a metallic parabolic dish is never better
than 50% I have uptodate my previous link budged calculation
using a reflection factor of 50% for the ISS and as you can read
belove the S/N ratio at a distance of 700 km jumped up to +17dB
over the noise !
This means that your experimental investigation receiving +20 dB
match well with my calculation showing +17 dB and for the future
we can consider that a reflection factor for the ISS of 50% is a real
figure to be used.
Since you live in a quite location the antenna temperature at
1296 MHz when aimed toward the Cold Sky can be only 5 degrees
kelvin instead of the previously estimated 50 degrees kelvin
so that the overall Noise Floor of your receiving system
decreases by 3.29 dB
Read please the following revised calculations using a ISS
reflection factor of 50% instead of 10% at a range of 700 km
and 5 degrees kelvin for the equivalent antenna temperature Ta
instead of 50 kelvin
The following calculation is easyer than the previous one because
uses directly the RADAR equation.
LINK BUDGED CALCULATIONS by i8CVS
We consider the ISS like a passive reflector with reflectivity
factor of 50 % to try a QSO by reflection Earth-ISS-Earth
DATA:
1) The solar panels of the ISS plus the central body large like a
Boeing 747 have a metallic reflecting surface of about
2000 square meters and we consider the ISS like a circular
RADAR target having being a metallic plate an estimated
reflectivity factor S of 50 % at SHF
2) The range EARTH-ISS at elevation of 35 degrees is about
700 km
3) Our EME station at 1296 MHz uses a 3 meters dish in diameter
with gain of 29 dB and 200 W at the feed
4) The overall noise figure of our receive system is NF = 0.5 dB
while the antenna temperature is 5 kelvin when pointed at the
Cold Sky and we receive on CW using a filter with a BW large
500 Hz
5) We use only analogic reception without digital software like
WSJT or similar tecniques.
CALCULATION PROCEDURE :
Aiming the dish towards the ISS when distant 700 km and
transmitting on CW and using the RADAR equation we
calculate the Signal to Noise ratio S/N to see if on CW the
echoes reflected by the ISS are above or belove the Noise
Floor of receiver.
RADAR EQUATION
Pt x Gt x Ar x S
Pr = -----------------------------
( 4 x 3.14 x R^2 ) ^2
Where :
Pr = power received in watt
Pt = power transmitted = 200 watt
Gt = isotropic gain of a ground antenna at 1296 MHz = 29 dB
or 794.3 time in power
Ar = aperture area of isotropic antenna at 1296 MHz = 0,0043
square meters
S = Sigma or Radar Cross Section i.e. the surface of the ISS in
square meters with reflecting coefficient of 0.50 = 50 %
R = distance or range EARTH-ISS = 700 km = 700000 meters
NOTE:
(4 x 3.14 x R^2)^2 calculates the surface of a sphere having a
radius R=700000 meters squared 2 to take account of the
round trip "EARTH-ISS-EARTH"
CALCULATION OF ATTENUATION "EARTH-ISS-EARTH" :
S = Sigma of the ISS with reflecting surface of 2000 square meters
and reflection coefficient of 50 % = 2000 x 0.50 = 1000 square meters
Calculation of the aperture area Ar of isotropic antenna at 1296 MHz
/ 2 2
/\ 0,2314
Ar = ---------- = ----------- = 0,0043 square meters
4 x 3,14 4 x 3,14
Calculation of the received power Pr on the EARTH
collected by the antenna with gain of 29 dB or 794.3
time in power at 1296 MHz
200 x 794.3 x 0.0043 x 1000 -20
Pr = ------------------------------------- = 1.80 x 10 watt
(4 x 3.14 x 700000^2 )^2
-20
Pr = 10 log 1.80 x 10 = -197.4 dBW
10
CALCULATION OF THE OVERALL NOISE FLOOR
FOR THE RECEIVER :
Data of the 1296 MHz receiving system :
Overall Noise Figure of receiving system NF= 0.5 dB = 35 kelvin
Bandwidth BW of receiver on CW = 500 Hz
Equivalent Noise Temperature Ta of the antenna when aimed toward
the Cold Sky = 5 kelvin
Calculation to get the Noise Floor KTB of receiver
Where :
-23
K = Boltzmann constant = 1,38 x 10 joule/kelvin
T = Equivalent noise temperature Ta of the antenna plus the
equivalent Noise Temperature Te of receiver i.e. T= (Ta + Te)
Computation of the overall Noise Factor F for the receiver
F = 10 ^ (NF/10) and so F = 10 ^(0,5 / 10) = 10 ^0,05 = 1,12
in factor
The equivalent overall Noise Temperature Te of the receiver is
Te = ( F-1) x 290 = (1,12 -1) x 290 = 35 kelvin
The overall Noise Floor KTB of the receiving system with the
antenna connected is :
KTB = K x ( Te + Ta ) x BW and in numbars :
-23
Noise Floor KTB = 1,38 x 10 x ( 35 + 5 ) x 500 = -185.5 dBW
LINK CALCULATION "round trip" EARTH -ISS-EARTH at 1296 MHz
on CW
Power Pr received on EARTH over
1296 MHz isotropic antenna ........... - 197.5 dBW
Antenna Gain in RX......................... + 29 dB
------------
Power available at receiver input .... - 168.5 dBW
RX Noise Floor......................... ........- 185.5 dBW
------------
S/N ratio CW at RX audio output... + 17.0 dB
CONCLUSION :
At a range of 700 km from the ISS and using a 3 meters dish with
200 W at the feed and a receiving system with a Noise Floor of
-185.5 dBW = - 155.5 dBm it is possible to hear your hown echo
signals in plain analogic CW with a Signal to Noise ratio S/N of
+17.0 dB wich is very strong.
If two stations are equipped with the same equipments it is
possible to make good QSO for a short time when the ISS
is close range around 700 km at elevation of about 35
degrees.
Increasing the BW of receiver at 2700 Hz to try receive SSB
it is possible since 10 time log (2700/500) = 7.3 dB and
+17 dB - (+7.3 dB ) = +9.7 dB and so the signal scattered back
by the ISS in SSB will have a S/N ratio of about + 9.7 dB
i.e. well over the Noise Floor of your receiver.
It is necessary to use a precise traking system particularly fast
to move the dish as soon the ISS approach the TCA because
the beam wide of a 3 meter dish with gain of 29 dB is large
only about 5 degrees at the -3 dB points so that traking the
ISS at 1296 MHz with a 3 meter dish or even larger for EME
it seems to be the more critical point of the experiment.
73" de
i8CVS Domenico
------------------------------
Message: 3
Date: Sat, 01 Jun 2013 23:42:32 -0400
From: Lee McLamb <ku4os@xxx.xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ANS-153 AMSAT News Service Weekly Bulletins
Message-ID: <C0.8F.07131.92FBAA15@xxxxxxxxxxxxx.xxxx.xx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
AMSAT NEWS SERVICE
ANS-153
The AMSAT News Service bulletins are a free, weekly news and infor-
mation service of AMSAT North America, The Radio Amateur Satellite
Corporation. ANS publishes news related to Amateur Radio in Space
including reports on the activities of a worldwide group of Amateur
Radio operators who share an active interest in designing, building,
launching and communicating through analog and digital Amateur Radio
satellites.
The news feed on http://www.amsat.org publishes news of Amateur
Radio in Space as soon as our volunteers can post it.
Please send any amateur satellite news or reports to:
ans-editor at amsat.org.
In this edition:
* Deadline for AMSAT-NA Board of Directors Nominations Approaching
* Barry Baines, WD4ASW Interview with Amateur Radio Newsline
* IARU Issues Position Paper on Nanosatellites and Picosatellites
* Joe Spier K6WAO Joins ANS Editorial Staff
* ANTELSAT CubeSat
* 5 in EM55 Award
SB SAT @ AMSAT $ANS-153.01
ANS-153 AMSAT News Service Weekly Bulletins
AMSAT News Service Bulletin 153.01
From AMSAT HQ SILVER SPRING, MD.
June 2, 2013
To All RADIO AMATEURS
BID: $ANS-153.01
Deadline for AMSAT-NA Board of Directors Nominations Approaching
It is time to submit nominations for the upcoming open seats on the
AMSAT-NA Board of Directors. A nomination requires either one Member
Society or five current individual members in good standing to
nominate an AMSAT member for the position. Four director's terms
expire this year: Barry Baines, WD4ASW, Alan Biddle, WA4SCA, Drew
Glasbrenner, K04MA, and Tony Monteiro, AA2TX.
In addition to traditional submission of written nominations, which
remains unchanged and is the preferred method, nominations may be
made by electronic means. These include e-mail, FAX, or electronic
image of a petition. Electronic petitions should be sent to
MARTHA at AMSAT.ORG or faxed to 301-608-3410.
Written nominations, consisting of names, calls and individual sig-
natures should be mailed to:
AMSAT-NA
850 Sligo Ave #600
Silver Spring, MD, 20910
No matter what means is used, petitions MUST arrive no later than
June 15th at the AMSAT-NA office. If the nomination is a traditional
written nomination, no other action is required. If it is other than
this, i.e. electronic, a verifying traditional written petition MUST
be received at the AMSAT-NA office at the above address within 7 days
following the close of nominations on June 15th.
ELECTRONIC SUBMISSIONS WITHOUT THIS SECOND, WRITTEN VERIFICATION
ARE NOT VALID UNDER THE EXISTING AMSAT-NA BYLAWS.
[ANS thanks the AMSAT Office for the above information]
---------------------------------------------------------------------
Barry Baines, WD4ASW Interview with Amateur Radio Newsline
The weekly broadcast of the Amateur Radio Newsline interviewed AMSAT President
Barry Baines, WD4ASW at the Dayton Hamvention about the Fox-1 cubesat and the
current situation in working with ITAR
regulations. This was included in Amateur
Radio Newsline Report 1868, dated May 31 2013 and
carried on-the-air during many
nets and amateur radio news reports. A full transcript of the interview with
Barry, titled, ?HAMVENTION 2013: PART 2 ? WRAPPING IT UP?, by Amateur Radio
Newsline?s Stephan Kinford, N8WB: is available at the AMSAT Website
http://ww2.amsat.org/?p=661
[ANS thanks the Amateur Radio Newsline for the above information]
---------------------------------------------------------------------
IARU Issues Position Paper on Nanosatellites and Picosatellites
During a teleconference in mid-May, the IARU Administrative Council authorized
the distribution of a paper which sets forth the IARU positions on the agenda
items that will be considered during the World Radiocommunication Conference
in
2015. Resolution 757 calls for the results of studies of the procedures for
notifying space networks that presently apply to nanosatellites and
picosatellites to be reported to WRC-15. Because
of the possible implications of
these studies for the amateur and amateur-satellite services, the IARU is
following the progress of these studies attentively.
The agenda items that impact amateur radio and amateur-satellite services
including the IARU position on each of those
agenda items have been published in
the IARU E Newsletter for May 29, 2013.
http://ukamsat.files.wordpress.com/2013/05/iaru-e-newsletter-29-may-2013.doc
The IARU says all IARU member-societies are encouraged to meet with their
telecommunication authorities to discuss the WRC-15 Agenda Items and to gain
support from their telecom authorities for the IARU positions.
[ANS thanks AMSAT-UK for the above information]
---------------------------------------------------------------------
Joe Spier K6WAO Joins ANS Editorial Staff
Joe Spier K6WAO, of Weimar, CA has joined the AMSAT News Service as a rotating
editor. Joe also serves AMSAT as Associate Director for Education. He was the
contact liaison for the AMSAT sponsored Pacificon
ARISS contact, last Fall. Look
for Joe?s first ANS Bulletin, scheduled for release on June 9 as ANS 160.
AMSAT
welcomes Joe and thanks him for volunteering his
time to the AMSAT News Service.
Please send any news related to amateur radio in
space to the ANS Editor mailbox
at ans-editor@xxxxx.xxx.
[AMS welcomes Joe, K6WAO, to the Weekly News Team]
---------------------------------------------------------------------
ANTELSAT CubeSat
ANTELSAT is a 2U CubeSat class satellite with a 70 cm SSTV downlink and
amateur
radio AX.25 Digipeater that is planning a Yasny Dnepr launch in 2013. It has
been developed by ANTEL (the national telecom service provider) and Facultad
de
Ingenier?a de la Universidad de la Rep?blica (FING), the State Faculty of
Engineering.
The purpose is to build and operate the first
satellite ever launched into orbit
by Uruguay. Its goal is to develop skills in
radio and aerospace engineering, to
promote enthusiasm in STEM education at all levels, and provide challenging
activities for undergraduate students. The spacecraft is planned to transmit
colour and infrared images of the surface of the earth, and to provide several
services to radio amateurs (AX.25 digipeater, telemetry beacon, uplink signal
report, SSTV downlink). The mission is purely experimental and a technology
demonstrator of all the satellite subsystems, which have been custom designed
locally.
Communications:
- VHF receiver on 2m amateur band, 1200bps AX25 protocol.
- Telecommand uplink.
- Store and forward (digipeater) service uplink.
- UHF transmitter on 70cm amateur band:
- CW beacon.
- Telemetry downlink at 1200 bps AX25 protocol.
- Backup downlink for image data via low resolution SSTV.
- Store and forward service downlink.
- S-band transmitter on 2.4 GHz:
- Downlink for payload image data.
- Telemetry backup link.
- 2 redundant transmitters.
Attitude control:
- Attitude determination via magnetometer and photodetectors.
- Active 3-axis control via magnetorquers.
[ANS thanks AMSAT-UK for the above information]
---------------------------------------------------------------------
5 in EM55 Award
Congratulations to Dave Beumer, W0DHB for earning certificate #46 for
5 IN EM55 award. This award is earned by working five (5) different
hams in the EM55 grid. You do not have to be in your home grid to
count the stations worked. There are several satellite ready hams in
EM55: WA4NVM, WA4HFN, WB4LHD, WA4OVO, KI4OTG, KD4NOQ, KJ4BIX, AJ4KF,
N4MGT and W5KUB.
Send your log to WA4NVM or WA4HFN for checking, along with your
current mailing address. The award is free and should any donations be
sent, they will be forwarded to AMSAT along with your call and name.
Contacts between June 1, 2011 to the present count for this award.
[ANS thanks Rick, WA4NVM, for the above information]
In addition to regular membership, AMSAT offers membership in the
President's Club. Members of the President's Club, as sustaining
donors to AMSAT Project Funds, will be eligible to receive addi-
tional benefits. Application forms are available from the AMSAT
Office.
Primary and secondary school students are eligible for membership
at one-half the standard yearly rate. Post-secondary school students
enrolled in at least half time status shall be eligible for the stu-
dent rate for a maximum of 6 post-secondary years in this status.
Contact Martha at the AMSAT Office for additional student membership
information.
73,
This week's ANS Editor,
Lee McLamb, KU4OS
ku4os at amsat dot org
------------------------------
Message: 4
Date: Sun, 2 Jun 2013 08:53:55 +0000 (UTC)
From: Aayush Yadav <member@xxxxxxxx.xxx>
To: "Robert M." <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Invitation to connect on LinkedIn
Message-ID:
<913309323.7434450.1370163235337.JavaMail.app@xxxxxxxxxx.xxxx>
Content-Type: text/plain; charset=UTF-8
LinkedIn
------------
Aayush Yadav requested to add you as a connection on LinkedIn:
------------------------------------------
Robert,
I'd like to add you to my professional network on LinkedIn.
- Aayush
Accept invitation from Aayush Yadav
http://www.linkedin.com/e/vpmdc3-hhfztalv-1g/vrPMffREHNUS2Ifd_2lTTGJ0FlYaEo/bl
k/I584545609_16/3wOtCVFbmdxnSVFbm8JrnpKqlZJrmZzbmNJpjRQnOpBtn9QfmhBt71BoSd1p65
Lr6lOfPoNnPAMdzkQdjgUdkALhz9Uekdppn8LejkUc3wVc3oTcP4LrCBxbOYWrSlI/eml-comm_inv
m-b-in_ac-inv28/?hs=false&tok=3y-ysTV4NlsRM1
View profile of Aayush Yadav
http://www.linkedin.com/e/vpmdc3-hhfztalv-1g/rso/212309309/p-4P/name/17619030_
I584545609_16/?hs=false&tok=2f_2At_JRlsRM1
------------------------------------------
You are receiving Invitation emails.
This email was intended for Robert McGwier.
Learn why this is included:
http://www.linkedin.com/e/vpmdc3-hhfztalv-1g/plh/http%3A%2F%2Fhelp%2Elinkedin%
2Ecom%2Fapp%2Fanswers%2Fdetail%2Fa_id%2F4788/-GXI/?hs=false&tok=2pZ6pcAu1lsRM1
(c) 2012, LinkedIn Corporation. 2029 Stierlin Ct, Mountain View, CA 94043,
USA.
------------------------------
Message: 5
Date: Sun, 2 Jun 2013 04:20:02 -0500
From: "Nick Pugh" <quadpugh@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] help with M^2 2MCP22
Message-ID: <040701ce5f72$5d221bf0$176653d0$@xxx>
Content-Type: text/plain; charset="us-ascii"
We have high SWR on our M^2 2MCP22 that has been up for several years . Does
someone on the list have the wiring digram of the block where the hairpin
coax is connected to the driven elements.
Thanks
nick ARS K5QXJ EM30xa 30.1N 92.1W
Office 337 593 8700
Cell 337 258 2527
Helping UL become a world Class Engineering and Educational School
------------------------------
Message: 6
Date: Sun, 2 Jun 2013 11:04:49 +0100 (BST)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxxx jlv <jlv@xxxx.xxx.xx>
Subject: [amsat-bb] Re: Pegaso update via Google translate
Message-ID:
<1370167489.82812.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
--- On Sat, 1/6/13, jlv <jlv@xxxx.xxx.xx> wrote:
> somebody know the Pegaso estabilization system
http://exa.academia.edu/RonnieNader/Papers/795135/NEE-01_PEGASUS_The_first_Ecu
adorian_Satellite
"PMSS: This the spacecraft navigation system, which
uses the EMF to stabilize its position in 1 axis, using
4 linear arrays of magnets and inertial-magnetic
dampers"
I believe the launch of its successor NEE-02 Krysaor is planned for a Yasny
Dnepr in November 2013.
http://amsat-uk.org/2013/02/14/two-tv-cubesats-from-ecuador/
73 Trevor M5AKA
------------------------------
Message: 7
Date: Sun, 2 Jun 2013 10:58:42 -0300
From: "jlv" <jlv@xxxx.xxx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Pegaso update via Google translate
Message-ID: <963C41E8BC144CC0AC48FFD978819EB2@xxxxx>
Content-Type: text/plain; format=flowed; charset="utf-8";
reply-type=original
many thanks Trevor...
I will read the report again....
jlv
-----Mensaje original-----
From: M5AKA
Sent: Sunday, June 02, 2013 7:04 AM
To: amsat-bb@xxxxx.xxx ; jlv
Subject: Re: [amsat-bb] Re: Pegaso update via Google translate
--- On Sat, 1/6/13, jlv <jlv@xxxx.xxx.xx> wrote:
> somebody know the Pegaso estabilization system
http://exa.academia.edu/RonnieNader/Papers/795135/NEE-01_PEGASUS_The_first_Ecu
adorian_Satellite
"PMSS: This the spacecraft navigation system, which
uses the EMF to stabilize its position in 1 axis, using
4 linear arrays of magnets and inertial-magnetic
dampers"
I believe the launch of its successor NEE-02 Krysaor is planned for a Yasny
Dnepr in November 2013.
http://amsat-uk.org/2013/02/14/two-tv-cubesats-from-ecuador/
73 Trevor M5AKA
------------------------------
Message: 8
Date: Sun, 2 Jun 2013 12:45:47 -0500
From: "Rick - WA4NVM" <wa4nvm@xxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SO-50 pass from FN54
Message-ID: <5EE86D7D737945729FF946ECAB567A53@xxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Joe, WA4OVO just called me from FN54if and plans to be on the next
pass of SO-50 at 1912z.
Good luck if you need the grid,
Rick WA4NVM
------------------------------
Message: 9
Date: Sun, 2 Jun 2013 14:05:22 -0400
From: Rick Walter <wb3csy@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Tilting Yagi up 15 degrees above horizon
Message-ID:
<CAJckjgPzWapdBU5GCLSwfsLhSdkRw4GMdVYw5ZwbwmNxGQRdTQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
With all the talk about tilting a Yagi 15 degrees above the horizon and
using a rotor in azimuth only, I have a question. Since every Yagi I have
includes mounting hardware to mount the antenna at a 90 degree angle to the
mast, how do you tilt it 15 degrees? Do you put a bend in the mast pipe?
Can you purchase hardware to allow the Yagi to tilt relative to the mast?
Maybe everyone knows a simple answer but I will admit I do not.
Thanks and 73,
Rick - WB3CSY
--
Sent from Rick's gmail account
------------------------------
Message: 10
Date: Sun, 02 Jun 2013 11:59:25 -0700
From: Greg D <ko6th.greg@xxxxx.xxx>
To: Rick Walter <wb3csy@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Tilting Yagi up 15 degrees above horizon
Message-ID: <51AB960D.3090307@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Most use a cross-arm to mount the antenna, even if the cross-arm is not
rotatable in Elevation. Then you can attach the antenna in any
elevation desired, and mount both a 2m and 70cm antenna, one on either
side of the rotor for balance.
I suppose bending the mast pipe would work too. I hadn't thought of that.
Greg KO6TH
Rick Walter wrote:
> With all the talk about tilting a Yagi 15 degrees above the horizon and
> using a rotor in azimuth only, I have a question. Since every Yagi I have
> includes mounting hardware to mount the antenna at a 90 degree angle to the
> mast, how do you tilt it 15 degrees? Do you put a bend in the mast pipe?
> Can you purchase hardware to allow the Yagi to tilt relative to the mast?
> Maybe everyone knows a simple answer but I will admit I do not.
>
> Thanks and 73,
>
> Rick - WB3CSY
>
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 8, Issue 186
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