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CX2SA > SATDIG 08.03.16 02:32l 760 Lines 31629 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. attic antenna (Pete Parisetti)
2. Long Beach CA presentation on 4 March & W6RO satellite
activity on 5 March - report (Patrick STODDARD (WD9EWK/VA7EWK))
3. Must have been tropo this morning (J. Boyd (JR2TTS))
4. Re: Frequency Doubler? (Tomas H?rdin)
5. In addition to a Baefong UV-5R, what should one get to work
SO-50? (John Brier)
6. Re: attic antenna (Thomas Doyle)
7. Upcoming ARISS contact with Atlanta Science Festival,
Atlanta, Georgia (n4csitwo@xxxxxxxxx.xxxx
8. Open Systems Architecture and Modularity Survey - Thank you
(Brandon Shirley)
9. Re: In addition to a Baefong UV-5R, what should one get to
work SO-50? (Dani EA4GPZ)
10. Re: Upcoming ARISS contact with Powys Secondary Schools, Mid
Wales, UK (Daniel Cussen)
11. Re: In addition to a Baefong UV-5R, what should one get to
work SO-50? (Patrick STODDARD (WD9EWK/VA7EWK))
----------------------------------------------------------------------
Message: 1
Date: Sun, 6 Mar 2016 23:18:08 +0000
From: Pete Parisetti <peteparisetti@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] attic antenna
Message-ID:
<CALiAUx9cZxr-iKowvOgRVQ0_SJRQmoBiKEy+8nJq9xAOpgKbCQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Having read about some mighty satellite antenna installations in the attic
- one in particular... - I wanted to run a few tests of my local conditions
before going ahead with a similar project.
I built a GP for 146 MHz using wire hangers (SWR flat across the entire 144
and 430 MHz bands....), placed it in my attic and fed it with 45' of
Ecoflex 10.
On a dry day, today I could hear the FO-29 beacon from about 10 degrees to
about 10 degrees. I find this extraordinary. I don't know if ther roof
slates will attenuate more when wet (this may be a urban legend...), but on
a day like today I think the difference attic/outside is almost negligible.
73 Pete MM0TWX
------------------------------
Message: 2
Date: Sun, 6 Mar 2016 23:36:11 +0000
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Long Beach CA presentation on 4 March & W6RO
satellite activity on 5 March - report
Message-ID:
<CAN6TEUcPsu=9ZeEONpgqXZGjYQUWMg_iCMyRcqTvwgE=bbCb1g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hi!
I'm back home, after a quick two-day trip to southern California for a
presentation and some sightseeing. Not as much radio operating on this
trip compared to some of my other recent trips to California, but still
a great time!
I had agreed to give another satellite-related presentation to the
Associated Radio Amateurs of Long Beach, after giving a presentation there
in April 2015. Where my original presentation focused a lot on the history
of amateur radio satellites, the presentation I gave on Friday (4 March)
evening would focus more on current and upcoming projects. So I left home
on Friday morning for the 6-hour drive from Phoenix to Long Beach, with
two stops to work AO-85 passes at Palm Springs and Riverside, both in grid
DM13 in southern California. Before the meeting, I had dinner with some
hams who would be at the meeting later in the evening. Endaf KG6FIY, the
ARALB president, along with Tom WA0POD and Jim AA6QI from Pasadena, met me
at a restaurant near the meeting site. After dinner, we drove south to the
meeting.
Unlike with last year's presentation where I gave demonstrations of working
FO-29 and SO-50, my options were limited to XW-2F and XW-2C passes that
partially overlapped, about 30 minutes before the 7pm (0300 UTC) meeting
time. With a nice crowd, I set up my portable station - FT-817ND, SDRplay
SDR receiver with HDSDR on a Windows tablet, Elk log periodic - to work the
two satellites. XW-2F came up first, and I made a quick contact with KJ6MSU
in southern California. Unfortunately, no QSOs were logged on XW-2C. The
crowd could see the transponder, along with the digital telemetry and CW
beacons, on the tablet's screen. We also saw some strong adjacent signals
just above the XW-2F transponder while working that satellite.
There was a nice turnout for this meeting. I'm not used to groups here in
Arizona having Friday evening meetings, but it works for the ARALB. After
some club business, I gave my presentation. It is really nice to talk about
the different satellite and satellite-related projects that are taking
place now. It was also fun to answer the questions from the crowd.
Since most of my recent California trips have included additional driving
and operating from different places, and I have not done much sightseeing,
I wanted to be more of a tourist this time. Endaf KG6FIY gave me some
suggestions on what I could see and do on a Saturday, and I went with that.
Before I met him to start the touristy stuff, I worked an SO-50 pass from
a shopping center parking lot. Once I picked up Endaf, we first drove to
the Griffith Observatory, overlooking downtown Los Angeles. It was a nice
day to walk around with the clouds over the area, not too hot or cold.
>From there, we took our time driving back through Los Angeles down to the
Long Beach harbor and the Queen Mary.
I have been to Long Beach in the past, and have driven near the Queen Mary,
but have never been on the ship. Endaf had arranged for me to go on the
ship, and visit the wireless room. Some insist on calling the room a "radio
room", and signs on the ship refer to it by both names. At the room, I met
David Akins N6HHR. David, a member of the ARALB, is the manager of the W6RO
station on the Queen Mary. He invited Endaf and me to come in the room,
sign a visitor's log, and then sign a radio operators' log. David verified
that we held amateur licenses, so we could use the radios. Endaf began to
work HF from one operating position, as I looked around the room and took
pictures. Then, a surprising offer...
David explained that the W6RO station included a satellite station - a
Yaesu FT-847, 2m and 70cm Yagis, along with a Yaesu az/el rotator. Even
though the FT-847 can also work HF and 6m, it is only used at W6RO for
satellites, and had not been used in some time. It had been installed in
the days of AO-13. David asked if there were any satellite passes that
could be worked, and I saw an AO-7 pass just after 2.30pm (2230 UTC). With
a half-hour to quickly get acquainted with the radio and rotator
controller, I started reading the satellite section of the FT-847's
operating manual. I also posted on Twitter and the AMSAT-BB my intent to
work the AO-7 pass as W6RO.
The satellite station is not computer controlled, but the FT-847 has the
functionality to work satellites without the computer. The rotator
controller could also be worked manually, moving it to follow the track
I saw on my AmsatDroid Free tracking app. The pass had a maximum elevation
of just over 70 degrees, making it a good pass to try from W6RO. I have
never used an FT-847 to work satellites, but had figured the radio out
sufficiently to give it a go.
I had posted that I was going to try working below the center of the AO-7
transponder, but ended up working slightly above the center of the
transponder. As I was trying to line myself up, I found that the SUB-TUNE
knob on the FT-847 would only tune downward - even if turned it clockwise.
This meant to adjust my uplink higher in SAT mode, I would have to
disengage the SAT mode and swap VFOs briefly to use the large VFO knob to
make the adjustment, then swap VFOs again and press the button to reengage
SAT mode. After a few minutes, I was able to hear myself, and hear Dave
KG5CCI answering my calls. Dave was the first station I put in the W6RO
log. After some challenges with how I had to tune the uplink frequency,
I was able to log two more stations before LOS - Larry WA6DIR in the Los
Angeles area, followed by Bryan KL7CN/W6 near Sacramento in northern
California.
At W6RO, operators are asked to log QSOs and give out a QSO number. For my
satellite QSOs, those numbers started with "I" followed by 3 digits. I did
this, along with giving out the DM03 grid locator for Long Beach with each
of these QSOs. The QSOs have been entered in the W6RO log, and the W6RO
QSL manager will be able to properly confirm the QSOs I logged - including
the notation that these were satellite QSOs. Please look up W6RO on QRZ.com
for the address and other information. W6RO only handles paper QSLs, and
does not use any of the electronic QSLing systems like LOTW or eQSL.
While I was operating, Endaf was taking pictures and made a couple of short
video clips. The pictures were being tweeted using his @xxxxxxxx Twitter
feed. If you do not use Twitter, you can still see the pictures without
having to sign up for a Twitter account at:
https://twitter.com/endaf_99/media
Endaf's two video clips are on YouTube, at:
https://www.youtube.com/watch?v=K-cQ09H-Ll8
https://www.youtube.com/watch?v=Lg2QFB3ubRQ
I had also tweeted photos of the W6RO station and antennas, along with
other photos from throughout the two days I spent in California, using my
@xxxxxx Twitter feed. Just like with Endaf's Twitter feed, mine is also
visible without first signing up for Twitter at:
https://twitter.com/WD9EWK
For just the photos I tweeted, use:
https://twitter.com/WD9EWK/media
After I put my QSOs in the W6RO log, and David verified everything looked
OK, we left the ship. Endaf and I had dinner at his house, before I drove
home. On the way home, I made a couple of stops to work some late-evening
SO-50 passes. The first stop was at a rest area along I-10 in Yucaipa, in
grid DM14. I logged 8 QSOs from this location on a pass just after 8.30pm
(0430 UTC). Then back to the driving, and I went about 45 miles east to
Thousand Palms, east of Palm Springs in DM13. After filling the car's fuel
tank, I logged 4 more QSOs on the 10.10pm (0610 UTC) SO-50 pass, and then
made the drive from the Palm Springs area to my driveway in just over 3.5
hours.
Thanks to the Associated Radio Amateurs of Long Beach for their hospitality
once again. In particular, the club president Endaf Buckley KG6FIY and the
W6RO station manager on the Queen Mary, David Akins N6HHR. I hope the ARALB
is able to put the W6RO satellite station on the air again, and often. :-)
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @xxxxxx
------------------------------
Message: 3
Date: Mon, 07 Mar 2016 13:34:27 +0900
From: "J. Boyd (JR2TTS)" <the2belo@xxx.xxxxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Must have been tropo this morning
Message-ID: <20160307131923.61B1.THE2BELO@xxx.xxxxxxx.xx.xx>
Content-Type: text/plain; charset="UTF-8"
I got unexpectedly good results on both FUNCube-1 and UKube-1 this
morning here in JA during three separate passes between 0000 and 0400
UTC, that I suspect was helped out by tropospheric ducting.
My QTH (PM85jl) is on the side of a mountain overlooking a valley, so
there is no direction I can look where I can see the horizon other than
a small sliver to the SSW. The mountain to the north wipes out the sky
up to 40? elevation, and the hills east and west cover up to at least
20?. Despite this, I received 10 packets from AO-73 with my Diamond
D-150 discone at 10m height, despite the bird being only being 11?
maximum el, and a fantastic 70 packets during its next higher pass,
where I heard the beacon loud and clear almost immediately after AOS,
despite it being far down behind the mountain.
I later got 26 packets from UKube-1 as it passed far to the west, with
the last one having been received *after* LOS, something that had not
happened to me before. With all of the terrestrial obstructions between
me and the bird at that moment, I can only think that tropo had given it
a boost.
At 739th place in the rankings and rising fast, watch out world...
--
J. Boyd, JR2TTS/NI3B
the2belo@xxx.xxxxxxx.xx.xx
http://www.flickr.com/photos/the2belo/
http://www.qrz.com/db/JR2TTS
Twitter: @xxxxxxxx
------------------------------
Message: 4
Date: Mon, 07 Mar 2016 10:38:21 +0100
From: Tomas H?rdin <tjoppen@xxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Frequency Doubler?
Message-ID: <1457343501.5085.10.camel@xxx.xxx.xx>
Content-Type: text/plain; charset="UTF-8"
A bridge rectifier should make a fine frequency doubler. I have doubts
a 1N4005 could do the job though, considering it's a rectifier diode.
Try digging around on digikey for RF diodes that can handle at least 1
amp (50W into 50Ohm -> 1.4A peak, but only half of that on average).
The?HSMP-382x series seems like a decent starting point - some of them
come with dual diodes in one package
I did some quick calculations in Octave, and a full bridge will give 4x
the power on the 2nd harmonic compared to a half wave rectifier (single
diode). Hope that helps
73
/Tomas, SA2TMS
On Sat, 2016-03-05 at 14:35 -0500, Robert Bruninga wrote:
> Does anyone remember how to make a High level frequency doubler???I
> need
> some energy on 902 MHz, and wonder about just blasting some diodes
> with a
> 451 MHz transmitter? (followed of course by a filter)...
>
> Seems like a full wave rectifier would give a strong 2X frequency
> component?
>
> I wonder if 1N4005's would do???At 50W input the capacitance per
> diode is
> around 1 pF
> Bob, WB4APR
> _______________________________________________
> 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: 5
Date: Mon, 7 Mar 2016 11:37:14 -0500
From: John Brier <johnbrier@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Cc: Patrick STODDARD <patrick@xxxxxx.xxx>
Subject: [amsat-bb] In addition to a Baefong UV-5R, what should one
get to work SO-50?
Message-ID:
<CALn0fKONJ=txsAD3uLMxgZCfB2y=dKnCvBQwQaAWYxhQKGX_oQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I'm pretty active on the amateur radio forum on Reddit [1] and last
night I posted about the upcoming ISS contacts this week [2). This
morning someone must have been reminded of me by that post and they
sent me this private message:
"Hey quick question on working SO-50 and other birds - I have a
Baofeng UV-5R right now and want to get a second for satellite work.
What am I looking for in a second HT since I already have a cheap one
and which would I use for TX/RX? Thanks!"
Patrick in particular, I know you have done a lot of testing with the
Chinese Radios, at least for AO-85, can you advise what this ham
should get and which one to use for up/down to work SO-50 in addition
to what they already have? I assume the purpose is to work
full-duplex.
73, John KG4AKV
1) https://www.reddit.com/r/amateurradio/
2) https://www.reddit.com/r/amateurradio/comments/49ajui/iss_school_contacts_tuesday_over_nyc_and_thursday/
------------------------------
Message: 6
Date: Mon, 7 Mar 2016 11:38:06 -0500
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: Pete Parisetti <peteparisetti@xxxxx.xxx>
Cc: AMSAT <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] attic antenna
Message-ID:
<CAHnRQR+cR394ePfJxNU1UL8p-e4mgbwuW53WGKRYBLFD3PbMnw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Pete,
I have been using an inside antenna for many years. The rafters in the
attic made it difficult to install anything but a ground plane up there so
I converted an extra bedroom into an antenna farm. This enabled me to put
in beams for 2M and 70cm with a Yaesu rotor. I am able to copy beacons down
to the horizon. The house has vinyl siding so that might help. Older homes
with aluminum siding might have more problems. There are also special
"energy saving" shingles around that have a layer of aluminum embedded in a
conventional asphalt shingle, these might also be more of a problem. Like
you I also found that at my location I believe the performance of
the inside antennas is very close to outside antennas on 70cm and below
with LEO satellites. This is empirical data. It is also nice not to have to
worry about wind, snow, ice and rain or climb around on a tower to make
adjustments.. My antennas and preamps look like new.
I suspect that in the unlikely event we ever have another HEO satellite
or on frequencies above 70cm the inside antenna might be more or a
problem. All my work with HEO sats back in the glory days used outside
antennas so I do not have any empirical data.
If the signal strength is high enough almost anything can work. I Think
about that every time I use my smart phone in an elevator to check my email.
W9KE Tom Doyle
On Sun, Mar 6, 2016 at 6:18 PM, Pete Parisetti <peteparisetti@xxxxx.xxx>
wrote:
> Having read about some mighty satellite antenna installations in the attic
> - one in particular... - I wanted to run a few tests of my local conditions
> before going ahead with a similar project.
>
> I built a GP for 146 MHz using wire hangers (SWR flat across the entire 144
> and 430 MHz bands....), placed it in my attic and fed it with 45' of
> Ecoflex 10.
>
> On a dry day, today I could hear the FO-29 beacon from about 10 degrees to
> about 10 degrees. I find this extraordinary. I don't know if ther roof
> slates will attenuate more when wet (this may be a urban legend...), but on
> a day like today I think the difference attic/outside is almost negligible.
>
> 73 Pete MM0TWX
> _______________________________________________
> 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
>
--
Sent from my computer.
tom ...
------------------------------
Message: 7
Date: Mon, 7 Mar 2016 11:59:56 -0500
From: <n4csitwo@xxxxxxxxx.xxx>
To: <ariss-press@xxxxx.xxx>, "amsat-edu" <amsat-edu@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Upcoming ARISS contact with Atlanta Science
Festival, Atlanta, Georgia
Message-ID: <39FBF45B85564548BF820A10324E5940@xxx>
Content-Type: text/plain; charset="iso-8859-1"
An International Space Station school contact has been planned with participants Atlanta Science Festival, Atlanta, Georgia
on 08 Mar. The event is scheduled to begin at approximately 16:11 UTC. It is recommended that you start listening approximately 10 minutes before this time.The duration of the contact is approximately 9 minutes and 30 seconds. The contact will be a telebridge between NA1SS and K6DUE. The contact should be audible over portions of the east coast of the U.S. Interested parties are invited to listen in on the 145.80 MHz downlink. The contact is expected to be conducted in English.
The Atlanta Science Festival, launched in 2014, is an annual, weeklong celebration of local science and technology. Approximately 45,000 curious people of all ages explore the science and technology unique to Atlanta and see how science is connected to all parts of our lives in a variety of hands on activities, facility tours, presentations, and performances throughout the metro Atlanta region. The ARISS radio contact will be a highlight of the 2016 Atlanta Science Festival, which enhances our objective to connect the public with STEM professionals and launch the dreams of thousands of young Atlantans toward careers in STEM and innovation. The students participating in our proposed ARISS contact event will be comprised of teachers and students from the 12 metro Atlanta region public school districts and local independent schools. The opportunity both to learn about space science and radio technology and to connect students in conversation with an astronaut in space would
yield a powerful event that is both inspirational and educational.
Participants will ask as many of the following questions as time allows:
1. What inspired you to become an astronaut?
2. What kinds of things are you hoping to discover on this mission?
3. How have you handled emergencies or unexpected events while working on
the International Space Station?
4. What would you say is the most useful invention that you have had to use
on the International Space Station?
5. While on the International Space Station, what is your favorite thing
that you have seen so far?
6. When preparing your spacesuit for a spacewalk, do you attach different
tools to it based on the assigned mission?
7. Have you ever seen anything that has made you think that there is
possibly other life in outer space?
8. What was the greatest disappointment you had to face in space?
9. How long does it take to become and astronaut and what process do you
have to go through?
10. What are your thoughts during your first ten seconds of flight?
11. How do you exercise while in space?
12. When in space, what do you do in your free time?
13. What type of gear to your need to remain safe in space? What protocols
do you have in place if your gear malfunctions?
14. What are the risks of having space debris aimed at the space stations?
How does it affect normal operations?
15. With problems such as poverty and global warming going on in the world,
why do you feel that it is important to fund space exploration?
16. What did you do to mentally prepare for your trip to space?
17. On your first mission to space, how nervous were you?
18. What was the most difficult part of your astronaut training?
19. How does it feel when you complete a mission?
20. If space travel was open to the general public, what would be a pro and
a con for public participants?
PLEASE CHECK THE FOLLOWING FOR MORE INFORMATION ON ARISS UPDATES:
Visit ARISS on Facebook. We can be found at Amateur Radio on the
International Space Station (ARISS).
To receive our Twitter updates, follow @xxxxxxxxxxxx
Next planned event(s):
1. North Dakota Space Grant Consortium (NDSGC), Grand Forks, North
Dakota, telebridge via W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Tim Kopra KE5UDN
Contact is a go for: Thu 2016-03-10 19:08 UTC
ABOUT ARISS
Amateur Radio on the International Space Station (ARISS) is a cooperative venture of international amateur radio societies and the space agencies that support the International Space Station (ISS). In the United States, sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American Radio Relay League (ARRL), and the National Aeronautics and Space Administration (NASA). The primary goal of ARISS is to promote exploration of science, technology, engineering, and mathematics (STEM) topics by organizing scheduled contacts via amateur radio between crew members aboard the ISS and students in classrooms or informal education venues. With the help of experienced amateur radio volunteers, ISS crews speak directly with large audiences in a variety of public forums. Before and during these radio contacts, students, teachers, parents, and communities learn about space, space technologies, and amateur radio. For more information, see www.ariss.org, www.amsat.org, and www.a
rrl.org.
Thank you & 73,
David - AA4KN
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
------------------------------
Message: 8
Date: Mon, 7 Mar 2016 17:29:28 +0000
From: Brandon Shirley <Brandon.Shirley@xxx.xxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Open Systems Architecture and Modularity Survey -
Thank you
Message-ID: <2ff2ded2233942e28209f2072e39193b@xx.xxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I'd like to thank everyone who participated in the Open Systems Architecture and Modularity survey; the Open Systems Architecture and Modularity survey has now closed. I will notify the winners of this survey's drawing within 1 week. The winners of the overall survey set will be notified after the entire survey set closes.
*** The next survey will start tomorrow. The next survey will be the Security Survey. ***
V/R,
Brandon Shirley
b.l.s@xxxxxxxxx.xxx.xxx
------------------------------
Message: 9
Date: Mon, 7 Mar 2016 18:35:03 +0100
From: Dani EA4GPZ <daniel@xxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] In addition to a Baefong UV-5R, what should
one get to work SO-50?
Message-ID: <56DDBBC7.5010302@xxxxxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
El 07/03/16 a las 17:37, John Brier escribi?:
> "Hey quick question on working SO-50 and other birds - I have a
> Baofeng UV-5R right now and want to get a second for satellite work.
> What am I looking for in a second HT since I already have a cheap one
> and which would I use for TX/RX? Thanks!"
>
> Patrick in particular, I know you have done a lot of testing with the
> Chinese Radios, at least for AO-85, can you advise what this ham
> should get and which one to use for up/down to work SO-50 in addition
> to what they already have? I assume the purpose is to work
> full-duplex.
What about a second UV-5R? This is a nice radio for its price, so
getting a second one seems like the obvious solution. The only problem
that could happen is that the Baofeng as TX is not so clean or the RX
filters are not very good and you get desense. I think this won't
happen, but I've never tested it. I could test it, because I have a
couple of UV-5R, but probably somebody else already knows.
Of course, the drawback of using a UV-5R as RX is that the receiver is
not so sensible, but I don't think that would be much of a problem to
work SO-50 if you have a decent antenna.
For me, a pair of UV-5R's seems like the best low cost solution to work
FM satellites full-duplex. At 20$ or 30$ on ebay each, the pair can be
cheaper than the full-duplex Chinese handhelds that suffer desense when
working V/U. Has anyone tested if this works as well as it seems?
73,
Dani EA4GPZ.
------------------------------
Message: 10
Date: Mon, 7 Mar 2016 19:23:17 +0000
From: Daniel Cussen <dan@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Upcoming ARISS contact with Powys Secondary
Schools, Mid Wales, UK
Message-ID:
<CAF3DnKjOmUx4fE-hPYoXNav3-AcbQmKC8hpK-bxDxocBRxXfcA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Here is the youtube recording from this event:
https://www.youtube.com/watch?v=znhEOMaGk2U&t=5m38s
Actual contact starts at 51 minutes here:
https://www.youtube.com/watch?v=znhEOMaGk2U&t=51m38s
------------------------------
Message: 11
Date: Mon, 7 Mar 2016 20:34:02 +0000
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: John Brier <johnbrier@xxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] In addition to a Baefong UV-5R, what should
one get to work SO-50?
Message-ID:
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John,
I saw your direct e-mail as well as this post on the -BB, but will
answer you in the public forum for the benefit of others as well.
I have used a pair of the Baofeng HTs for working SO-50. I
have tried
two UV-5Rs, two UV-82s, and mixing one UV-5R and one UV-82. When
mixing the radios, same or different models, I swapped which radio
was used as the transmitter and receiver. I even posted a YouTube
video with audio from working one hamfest demonstration with the
UV-82/UV-5R combination in 2014:
https://www.youtube.com/watch?v=_cLx9h-vNRA
?I added photos and slides with text to the audio, in making the
video, as I did not have actial video of the demonstration.? In
the video, I went with the UV-5R for the transmit radio, since it
has a two-way PTT that can directly key either VFO, and a speaker-mic
that could also key either VFO directly. This let me put 145.850
MHz in both VFOs for working SO-50, using different PL tones in
each VFO for waking the satellite vs. talking through the FM repeater.
?A second UV-5R could work to make a full-duplex station for SO-50.
Many have used two UV-5Rs, or a UV-5R with another Baofeng (or other
low-priced Chinese-made HT) to make a full-duplex station. The price
is obviously low enough to do that, without breaking the bank. It
can be done, but there are almost as many that have had frustrations
with the two-Baofeng setup for satellite work as those who have had
success doing.
If the budget for the second radio is more than the price of
a UV-5R or UV-82 type of radio, I'd recommend going to something
like one of the traditional ham manufacturers, or possibly Wouxun -
radios that generally have better receivers than the Baofengs,
no matter which Baofeng model you choose?. The unfortunate facts about
?many of the Chinese-made HTs - outside of possibly newer Wouxuns -
is quality control on the assembly line borders on the nonexistent.
One UV-5R might be working well and within the appropriate technical
requirements for use on the amateur bands, where the next unit off
the assembly line is horrid. There was a recent QST article that
addressed this point, based on ARRL testing of HTs at Dayton last
year. From my testing, I'd prefer to use a Wouxun KG-UV8D over
almost anything Baofeng (or the other HTs based on the UV-5R, sold
under a zillion different names), especially on the receive side.
Even better, in terms of a Chinese-made HT, would be a Wouxun
KG-UV9D - the one Chinese HT that seems to have a nice receiver
that finally starts to approach what comes from the traditional
ham manufacturers. The KG-UV8D and KG-UV9D will also work full-duplex
for AO-85, where the uplink is on 70cm, but both fail for full-duplex
using 2m uplinks (SO-50, LilacSat-2).
?I have not put any of my Baofeng or Wouxun HTs (or the others from
different Chinese brands) on test equipment. All of my testing is
from buying the radios, trying them out, and seeing what happens when
working the satellites. I have not tried the two-Baofeng combination
for AO-85 yet, as most of my Baofeng testing was done in 2014 when
we only had SO-50. I did more testing recently with Chinese-made
HTs, trying to clear up some misstatements online on whether or
not any of those HTs could be used to work AO-85 full-duplex.
73!
Patrick WD9EWK/VA7EWk
http://www.wd9ewk.net/
Twitter: @xxxxxx
Patrick in particular, I know you have done a lot of testing with the
> Chinese Radios, at least for AO-85, can you advise what this ham
> should get and which one to use for up/down to work SO-50 in addition
> to what they already have? I assume the purpose is to work
> full-duplex.
>
>
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