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CX2SA > SATDIG 25.03.17 21:18l 820 Lines 29344 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Sat program (JHBRTOO@xxx.xxxx
2. Sat APP (JHBRTOO@xxx.xxxx
3. Question about separate antennas (CT2IWW .)
4. Upcoming ARISS Contact Schedule as of 2017-03-24 04:00 UTC
(AJ9N@xxx.xxxx
5. Weekend Roving (Gabriel Zeifman)
6. Re: Best HT for satellite operation? (Dani EA4GPZ)
7. YN2/Nicaragua grid EK71 on sats (Clayton Coleman)
8. AO73 weekend operations (Graham Shirville)
9. Path loss Calculations (Joe)
10. Re: Path loss Calculations (Joe)
11. Satellite SDR: Seeing IS NOT Hearing (Clayton Coleman)
12. Re: Satellite SDR: Seeing IS NOT Hearing (Jeff)
13. EO-79 SAT (ingejack@xxx.xxxx
14. Re: Satellite SDR: Seeing IS NOT Hearing (CEE)
----------------------------------------------------------------------
Message: 1
Date: Thu, 23 Mar 2017 15:02:49 -0400
From: JHBRTOO@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Sat program
Message-ID: <a45c44.615a98c3.460575d9@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Had an answer just now- is so good to have that APP back again and I have
written it down in two places. Thanks all
Dave
------------------------------
Message: 2
Date: Thu, 23 Mar 2017 15:31:39 -0400
From: JHBRTOO@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Sat APP
Message-ID: <15656a.255ededb.46057c9b@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Someone suggested I share- SOOOOO----- http://LU7ABF.com.ar/pass.htm
Works on my Windows7 and more importantly on my Kindle (when I get it back
up or replace it)
------------------------------
Message: 3
Date: Thu, 23 Mar 2017 21:13:05 +0000
From: "CT2IWW ." <ct2iww@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Question about separate antennas
Message-ID:
<CA+LMQTYvptokNZvSn1OW90Q8=Q28P-HnsbWrnxD5F4nPNn_D5Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hello everyone,
I just got a couple crossed dipoles, one VHF, the other UHF, for some
satellite work.
How far apart should they be for proper operation and minimal influence on
each other?
I remember reading somewhere that it should be one wavelength of the lowest
band, in this case, two meters.
Thoughts?
Thanks
Paulo, CT2IWW
------------------------------
Message: 4
Date: Fri, 24 Mar 2017 00:30:48 -0400
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2017-03-24
04:00 UTC
Message-ID: <7c8baf.488e363b.4605faf7@xxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Upcoming ARISS Contact Schedule as of 2017-03-24 04:00 UTC
Quick list of scheduled contacts and events:
?School of Trois Paletuviers?, Saint-Georges de l'Oyapock, French Guyana,
telebridge via W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Thomas Pesquet KG5FYG
Contact was successful: Thu 2017-03-23 12:42:26 UTC 61 deg (***)
Council of State Science Supervisors, Los Angeles, CA, telebridge via
IK1SLD
The ISS callsign is presently scheduled to be OR4ISS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact is a go for: Wed 2017-03-29 18:03:38 UTC 21 deg
Russia School TBD, direct via TBD (***)
The ISS callsign is presently scheduled to be RS?ISS (***)
The scheduled astronauts are Andrei Borisenko, Sergey Ryzhikov, Oleg
Novitskiy (***)
Contact is a go for 2017-04-01 21:10 UTC (***)
Special contact with the Earhart Research Vessel, direct via NY?V (***)
The ISS callsign is presently scheduled to be NA1SS (***)
The scheduled astronauts are Shane Kimbrough KE5HOD and Sergey Ryzhikov
(***)
Contact was successful 2017-03-17 20:07 UTC (***)
****************************************************************************
**
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
****************************************************************************
***
Message to US Educators
Amateur Radio on the International Space Station
Contact Opportunity
Call for Proposals
Proposal Window February 15 ? April 15, 2017
The Amateur Radio on the International Space Station (ARISS) Program is
seeking formal and informal education institutions and organizations,
individually or working together, to host an Amateur Radio contact with a
crew
member on board the ISS. ARISS anticipates that the contact would be held
between January 1, 2018 and June 30, 2018. Crew scheduling and ISS orbits
will
determine the exact contact dates. To maximize these radio contact
opportunities, ARISS is looking for organizations that will draw large
numbers of
participants and integrate the contact into a well-developed education
plan.
The deadline to submit a proposal is April 15, 2017. Proposal information
and documents can be found at www.arrl.org/hosting-an-ariss-contact.
The Opportunity
Crew members aboard the International Space Station will participate in
scheduled Amateur Radio contacts. These radio contacts are approximately 10
minutes in length and allow students to interact with the astronauts through
a question-and-answer session.
An ARISS contact is a voice-only communication opportunity via Amateur
Radio between astronauts and cosmonauts aboard the space station and
classrooms and communities. ARISS contacts afford education audiences the
opportunity to learn firsthand from astronauts what it is like to live and
work in
space and to learn about space research conducted on the ISS. Students also
will have an opportunity to learn about satellite communication, wireless
technology, and radio science. Because of the nature of human spaceflight and
the complexity of scheduling activities aboard the ISS, organizations must
demonstrate flexibility to accommodate changes in dates and times of the
radio contact.
Amateur Radio organizations around the world, NASA, and space agencies in
Russia, Canada, Japan and Europe sponsor this educational opportunity by
providing the equipment and operational support to enable direct
communication between crew on the ISS and students around the world via
Amateur Radio.
In the US, the program is managed by AMSAT (Radio Amateur Satellite
Corporation) and ARRL (American Radio Relay League) in partnership with
NASA and
CASIS (Center for the Advancement of Science in Space).
More Information
Interested parties can find more information about the program at
www.ariss.org and www.arrl.org/ARISS.
For proposal information and more details such as expectations, proposal
guidelines and proposal form, and dates and times of Information Sessions go
to http://www.arrl.org/hosting-an-ariss-contact.
Please direct any questions to ariss@xxxx.xxx.
****************************************************************************
***
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
Listen for the ISS on the downlink of 145.8? MHz.
****************************************************************************
***
All ARISS contacts are made via the Kenwood radio unless otherwise noted.
****************************************************************************
***
Several of you have sent me emails asking about the RAC ARISS website and
not being able to get in. That has now been changed to
http://www.ariss.org/
Note that there are links to other ARISS websites from this site.
****************************************************************************
Looking for something new to do? How about receiving DATV from the ISS?
If interested, then please go to the ARISS-EU website for complete
details. Look for the buttons indicating Ham Video.
http://www.ariss-eu.org/
If you need some assistance, ARISS mentor Kerry N6IZW, might be able to
provide some insight. Contact Kerry at kbanke@xxxxxxxxx.xxx
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:
Satoshi 7M3TJZ with 123
Gaston ON4WF with 123
Francesco IK?WGF with 119
****************************************************************************
The webpages listed below were all reviewed for accuracy. Out of date
webpages were removed and new ones have been added. If there are
additional
ARISS websites I need to know about, please let me know.
Note, all times are approximate. It is recommended that you do your own
orbital prediction or start listening about 10 minutes before the listed
time.
All dates and times listed follow International Standard ISO 8601 date and
time format YYYY-MM-DD HH:MM:SS
The complete schedule page has been updated as of 2017-03-24 04:00 UTC.
(***)
Here you will find a listing of all scheduled school contacts, and
questions, other ISS related websites, IRLP and Echolink websites, and
instructions for any contact that may be streamed live.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
http://www.amsat.org/amsat/ariss/news/arissnews.txt
Total number of ARISS ISS to earth school events is 1127. (***)
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1088. (***)
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 47.
A complete year by year breakdown of the contacts may be found in the
file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Please feel free to contact me if more detailed statistics are needed.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following US states and entities have never had an ARISS contact:
Arkansas, Delaware, South Dakota, Wyoming, American Samoa, Guam, Northern
Marianas Islands, and the Virgin Islands.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
QSL information may be found at:
http://www.ariss.org/qsl-cards.html
ISS callsigns: DP?ISS, IR?ISS, NA1SS, OR4ISS, RS?ISS
****************************************************************************
The successful school list has been updated as of 2017-03-24 04:00 UTC.
(***)
http://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf
Frequency chart for packet, voice, and crossband repeater modes showing
Doppler correction as of 2005-07-29 04:00 UTC
http://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correction
.rtf
Listing of ARISS related magazine articles as of 2006-07-10 03:30 UTC.
http://www.amsat.org/amsat/ariss/news/ARISS_magazine_articles.rtf
Check out the Zoho reports of the ARISS contacts
https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415
****************************************************************************
Exp. 49 on orbit
Shane Kimbrough KE5HOD
Andrei Borisenko
Sergey Ryzhikov
Exp. 50 on orbit
Peggy Whitson
Thomas Pesquet KG5FYG
Oleg Novitskiy
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 5
Date: Fri, 24 Mar 2017 00:07:06 -0500
From: Gabriel Zeifman <gabrielzeifman@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Weekend Roving
Message-ID:
<CAEGYLCtuaaO3UMEZyJiKYj9k0WER-sYWbAWvUVTgNPkyEA8p1g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hello fellow bird talkers,
As is usual, I will be venturing on a roving trip this weekend departing
tomorrow (hooray for a random three day weekend). The plan is to head to
the Detroit/Windsor area. Because I can't resist crossing international
borders, expect to hear NJ7H/VE3 at some point, hopefully with a terminus
of EN92 or EN83 this trip.
I'll try to hit as many new /r grids in MO, IL, IN, MI as time allows, but
as usual I'll expect to be in a good time crunch on the way home. Skeds
available, hit me up on Twitter or email for whatever you need. I'll try to
be on general good passes (AO-7, FO-29, FM, good full continent stuff).
Feel free to watch my every movement on APRS NJ7H-9, or when that doesn't
work I can still be watched and harassed via iridium share.garmin.com/gz.
Have fun, and keep the power down.
73,
Gabe
NJ7H/V31NJ/C6AGZ/CRAZY
------------------------------
Message: 6
Date: Fri, 24 Mar 2017 12:00:09 +0100
From: Dani EA4GPZ <daniel@xxxxxxxx.xxx>
To: Ken M <va7kbm@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID: <7a36d658-c7b6-aae5-3072-46731c747254@xxxxxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
El 22/03/17 a las 19:07, Ken M escribi?:
> Hello all, The suggestions in this thread omitted some current Yaesu
> models, specifically th VX-8DR, FT-1XDR and FT-2DR. Are these not viable
> in-production options, in addition to the Kenwood TH-D72? Or were they
> omitted from the earlier suggestions because perhaps they don't offer
> built-in TNC capability? They claim to offer dual-band
> simultaneous-receive capability at least.
Hi Ken,
I use a FT-2DR as TX for FM satellites. It has simultaneous receive, but
it can't TX and RX simultaneously, so you would need a second radio to
do full-duplex.
For me the FT-2DR works fine, but I wouldn't recommend it if you're
picking an HT for satellite use only (because it's expensive and most of
the extra features are useless for satellite). Also, the VFO can only be
tuned in 5kHz or 12.5kHz steps, which is a bit inconvenient (no 2.5kHz
steps).
73,
Dani EA4GPZ.
------------------------------
Message: 7
Date: Fri, 24 Mar 2017 08:14:41 -0500
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] YN2/Nicaragua grid EK71 on sats
Message-ID:
<CAPovOwekkd6PYNh7ehvmjvfv27fW4eySY_PEoAibPHA+a25X1w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
On AO-85 at 12:55 UTC today I managed to contact three members of the
Texas DXpedition team in YN2/Nicaragua. They are in country for the
upcoming CQWPX Phone contest.
The bird was very high on them before they were able to get into the
satellite but I managed to work three team members: YN2KW, YN2MG, and
YN2MF. They were weak so you will need to have good ears to pick them
out on AO-85. I believe they have an HT and Arrow.
GL & 73
Clayton
W5PFG
------------------------------
Message: 8
Date: Fri, 24 Mar 2017 20:47:54 -0000
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Cc: funcube@xxxxxxxxxxx.xx.xx
Subject: [amsat-bb] AO73 weekend operations
Message-ID: <7CEE4D021C4647058D1130D57C86238C@xxxxxxx.xxxxx>
Content-Type: text/plain; charset="UTF-8"
Hi folks,
FUNcube/AO73 is now in full time amateur mode with the transponder ON. The
plan is for it to switch back to auto mode on Sunday pm UTC as usual.
Please see below for other FUNcube transponder info
Have FUN with the transponder.
73s Graham G3VZV and the FUNcube team.
++++++++++++++++++++++++++++++++++
FUNcube frequencies and other details
++++++++++++++++++++++++++++++++++
AO-73 FUNcube-1
The transponder is normally operational only when the satellite is in
eclipse, ie the solar panels are NOT being illuminated. During weekends
(from pm Fridays UTC to PM Sundays UTC) the transponder is operational 24/7.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power. During holidays,
eg Christmas, New Year, Easter, etc, the transponder maybe activated for
extended periods. Watch AMSAT-BB for announcements which are usually made on
Friday evenings (UTC)
The nominal transponder frequencies are:
Uplink: 435.150 - 435.130 MHz LSB (Inverting)
Downlink: 145.950 - 145.970 MHz USB
Telemetry Tx: 145.935 MHz BPSK
(The passband may be up to 15kHz higher depending on on-board temps. Lower
temperatures give higher freqs!)
FUNcube-2 (aka FUNcube on UKube)
The FUNcube-2 sub-system continues to operate autonomously and, almost
continuously, in amateur mode. The transponder is operational and the
telemetry downlink is functioning with about 70mW output. The FUNcube-1
Dashboard does not correctly display the telemetry but it does correctly
decode the data and uploads it to the FUNcube Data Warehouse from where it
can be examined. Most of the real time data channels are operational and
these include battery voltages, temperatures and ADCS data coming via the
main On Board Computer (OBC).
The transponder is interrupted for a few seconds every 2 minutes when the
other transmitter sends its CW beacon and, occasionally, for a few seconds
when the main OBC reboots (approx seven times each orbit).
The nominal transponder frequencies are:
Uplink: 435.080 - 435.060 MHz LSB (Inverting)
Downlink: 145.930 - 145.950 MHz USB
Telemetry Tx: 145.915 MHz BPSK
(The passband may be up to 10kHz higher depending on on-board temps. Low
temperatures give higher freqs!)
EO79 FUNcube-3
Due to power budget constraints the transponder cannot be operational 24/7
and an orbit specific schedule has been developed. The transponder will
commence operation 27 minutes after the spacecraft enters sunlight and will
stay on for a period of 25 minutes. This schedule may be modified in the
future
as a result of experience.
The nominal transponder frequencies are:
Uplink: 435.0723-435.0473 MHz LSB (Inverting)
Downlink: 145.946-145.971 MHz USB
Further detailed info on EO79 transponder frequencies is at:
https://amsat-uk.org/2016/11/10/eo79-funcube-3-transponder-commences-regular-o
peration/
EO88/Nayif-1/FUNcube-5
EO88 is presently operating in autonomous mode. The transponder is
operational when the satellite is in eclipse, ie the solar panels are NOT
being illuminated.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power.
The transponder frequencies are:
Uplink: 435.045 ? 435.015 MHz LSB (inverting)
Downlink: 145.960-145.990 MHz USB
Telemetry Tx: 145.940MHz
All FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL. We are very
grateful for the assistance given by Innovative Solution In Space Bv, The
Netherlands.
------------------------------
Message: 9
Date: Fri, 24 Mar 2017 21:20:42 -0500
From: Joe <nss@xxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Path loss Calculations
Message-ID: <ca9ac580-61c8-0dd9-c474-84d59cb22bf7@xxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Can anyone help me with some path loss calculations?
Joe WB9SBD
--
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
------------------------------
Message: 10
Date: Sun, 26 Mar 2017 01:23:50 +1100
From: Joe <gjmagee@xxxxxxxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Path loss Calculations
Message-ID: <132ec305-9989-2cde-fdf6-88cdd96186cc@xxxxxxxx.xxx.xx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Have a look here.
https://www.pasternack.com/t-calculator-fspl.aspx
Joe
On 25/03/2017 1:20 PM, Joe wrote:
> Can anyone help me with some path loss calculations?
>
> Joe WB9SBD
---
This email has been checked for viruses by AVG.
http://www.avg.com
------------------------------
Message: 11
Date: Sat, 25 Mar 2017 13:29:05 -0500
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing
Message-ID:
<CAPovOwdhgaY1k=rSN5HdqmpsqEs7kAQ-zH7fg0+7riRM3E5ULQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I happen to be a fan of using Software Defined Radio (SDR) to receive
amateur satellites. It is an inexpensive way to view all the signals
appearing on a satellite's passband simultaneously. While I don't
normally run SDR full time at my station, from time to time I use it
to monitor activity on busy satellite passes because I can view and
record all activity.
As a result of more people using SDR on satellites, I have discovered
an operating trait that warrants some discussion and evaluation.
On more than one occasion, I have given a call to a very specific
station, and instead of my intended target had another SDR-based
station appear on frequency immediately saying "QRZ? QRZ?" rather than
wait and listen to who is calling on the frequency. The SDR user saw a
signal on their waterfall and clicked on it. They "pounced" on what
they perceived to be another station looking to make contact which
might not necessarily be the case.
I've see the same thing happen a few times with pileups. There is an
existing pileup in progress when the SDR station comes into the
footprint. Rather than wait a short period to listen, they click on
the new signal in their waterfall, and immediately proceed to "QRZ" on
the frequency of the pileup, sometimes interrupting the flow of
existing contacts.
Just today I heard this scenario: Station 1 calls CQ. Station 2 went
to answer. The SDR user clicked on the waterfall, heard only part of
the callsign of Station 2, and proceeded to call Station 2, ignoring
the possibility that Station 2 was attempting to QSO with someone
else.
It seems to me the visual nature of SDR waterfalls is causing a
temporary lapse in judgement when it comes to a basic ham radio
principle that we apply to satellite operating -- listen with our ears
before transmitting.
SDR is a great listening tool. With great power comes great responsibility.
73
Clayton
W5PFG
------------------------------
Message: 12
Date: Sat, 25 Mar 2017 14:48:48 -0400
From: "Jeff" <jeff_griffin@xxxxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing
Message-ID: <67E9D9C4D35343209FB0B4637399EE99@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Clayton, are you sure you weren't listening to SO-50 :-)
73 Jeff kb2m
-----Original Message-----
From: Clayton Coleman
Sent: Saturday, March 25, 2017 2:29 PM
To: AMSAT-BB
Subject: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing
I happen to be a fan of using Software Defined Radio (SDR) to receive
amateur satellites. It is an inexpensive way to view all the signals
appearing on a satellite's passband simultaneously. While I don't
normally run SDR full time at my station, from time to time I use it
to monitor activity on busy satellite passes because I can view and
record all activity.
As a result of more people using SDR on satellites, I have discovered
an operating trait that warrants some discussion and evaluation.
On more than one occasion, I have given a call to a very specific
station, and instead of my intended target had another SDR-based
station appear on frequency immediately saying "QRZ? QRZ?" rather than
wait and listen to who is calling on the frequency. The SDR user saw a
signal on their waterfall and clicked on it. They "pounced" on what
they perceived to be another station looking to make contact which
might not necessarily be the case.
I've see the same thing happen a few times with pileups. There is an
existing pileup in progress when the SDR station comes into the
footprint. Rather than wait a short period to listen, they click on
the new signal in their waterfall, and immediately proceed to "QRZ" on
the frequency of the pileup, sometimes interrupting the flow of
existing contacts.
Just today I heard this scenario: Station 1 calls CQ. Station 2 went
to answer. The SDR user clicked on the waterfall, heard only part of
the callsign of Station 2, and proceeded to call Station 2, ignoring
the possibility that Station 2 was attempting to QSO with someone
else.
It seems to me the visual nature of SDR waterfalls is causing a
temporary lapse in judgement when it comes to a basic ham radio
principle that we apply to satellite operating -- listen with our ears
before transmitting.
SDR is a great listening tool. With great power comes great responsibility.
73
Clayton
W5PFG
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 13
Date: Sat, 25 Mar 2017 11:59:56 -0700
From: <ingejack@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] EO-79 SAT
Message-ID: <20170325145956.C8H6F.30924.imail@xxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Was on the 18:55 UTC pass of EO-79. Signals very strong however there were
no other stations heard during the complete pass. Was wondering why other
people are not utilizing this satellite ?? Are they afraid of manual tuning
of the Doppler or is it just too difficult for them to keep up with the Bird
?? even though it is hard to track and maintain Doppler it is still a great
satellite to work, Nice footprint and strong signals. Was on the satellite
many times in the past with same results.. Nobody heard !! JACK-KC7MG DM42
------------------------------
Message: 14
Date: Sat, 25 Mar 2017 12:05:42 -0700
From: CEE <cee@xxxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing
Message-ID: <e07ab138-aeea-abf7-77e5-d5d59c21186a@xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Clayton,
Good topic!
I would suggest that this behavior is not confined to SDR or satellite
QSOs, but pervades all modes and bands of our hobby. I am guilty of
this, but more due to excitement than intention. The good advice that is
not confined just to ham radio, listen first, listen again, always
applies, or as one local ham suggests, put mind in gear before the
mouth. Not to sound like Miss Manners, but perhaps one of the unique
aspects of our hobby is to always be considerate of the other operators.
I always appreciate those ham's who mentor by example with kindness and
absence of judgement.
Thanks for mentioning!
Chuck N7BFO
On 3/25/2017 11:29 AM, Clayton Coleman wrote:
> I happen to be a fan of using Software Defined Radio (SDR) to receive
> amateur satellites. It is an inexpensive way to view all the signals
> appearing on a satellite's passband simultaneously. While I don't
> normally run SDR full time at my station, from time to time I use it
> to monitor activity on busy satellite passes because I can view and
> record all activity.
>
> As a result of more people using SDR on satellites, I have discovered
> an operating trait that warrants some discussion and evaluation.
>
> On more than one occasion, I have given a call to a very specific
> station, and instead of my intended target had another SDR-based
> station appear on frequency immediately saying "QRZ? QRZ?" rather than
> wait and listen to who is calling on the frequency. The SDR user saw a
> signal on their waterfall and clicked on it. They "pounced" on what
> they perceived to be another station looking to make contact which
> might not necessarily be the case.
>
> I've see the same thing happen a few times with pileups. There is an
> existing pileup in progress when the SDR station comes into the
> footprint. Rather than wait a short period to listen, they click on
> the new signal in their waterfall, and immediately proceed to "QRZ" on
> the frequency of the pileup, sometimes interrupting the flow of
> existing contacts.
>
> Just today I heard this scenario: Station 1 calls CQ. Station 2 went
> to answer. The SDR user clicked on the waterfall, heard only part of
> the callsign of Station 2, and proceeded to call Station 2, ignoring
> the possibility that Station 2 was attempting to QSO with someone
> else.
>
> It seems to me the visual nature of SDR waterfalls is causing a
> temporary lapse in judgement when it comes to a basic ham radio
> principle that we apply to satellite operating -- listen with our ears
> before transmitting.
>
> SDR is a great listening tool. With great power comes great responsibility.
>
> 73
> Clayton
> W5PFG
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
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>
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 12, Issue 80
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