Please listen for N4KGL from EM70 on SO-50 Saturday Nov 2nd 1300 UTC. I
will be hand-held portable.
Dennis WA6QKN and I will combine Rapid Deployment Radio (RaDAR), Parks On
The Air (POTA), and Amateur Satellites along with a fun bike ride. All of
this in Wakulla County, Florida. Rapid Deployment Amateur Radio combines
the outdoors, amateur radio, and movement. You are welcome to try RaDAR in
the field or chase us on the radio. Please check https://pota.us/ for our
spots. We will use N4KGL as our callsign. In RaDAR we need at least five
contacts to move to the next location. For bikes, we need to move at least
two kilometers. Our bike rides will be longer to get from park to park.
Our four-hour clock for the challenge will start at 1300 UTC, 9 AM EDT,
with the SO-50 pass at the Wakulla Station Trailhead on the Tallahassee St
Marks Historic Rail Trail (POTA K-3661). We will complete our five contacts
on HF and ride our bikes to Wakulla State Forrest (POTA K-4643). Then
continue the bike ride to Wakulla Springs State Park (POTA K-1862). Our HF
contacts will be CW or SSB on 40, 20, or 17 meters. Please watch for our
spots on https://pota.us/#/
Our rig will be the Elecraft KX2 with the Elecraft KXPA100 amp. I will use
a bike cart to pull the rig and a 30 AH Bioenno battery. The antenna will
be a SOTABeams Band Hopper Link Dipole.
We may continue this pattern beyond four hours to qualify for one of the
RaDAR Awards sponsored by Parks On The Air.
Warthog Award: two RaDAR* transitions at or between entities during a 24
> hour period.
> Rhino Award: three RaDAR* transitions at or between entities during a 24
> hour period.
> Cheetah Award: five RaDAR* transitions at or between entities during a 24
> hour period
> Ostrich Award: seven RaDAR* transitions at or between entities during a 24
> hour period.
> Leopard Award: ten RaDAR* transitions at or between entities during a 24
> hour period.
> Lion Award: twelve RaDAR* transitions at or between entities during a 24
> hour period
RaDAR Group on MeWe
RaDAR on Groups.io
Parks On The Air
Tallahassee St Marks Rail Trail
Any IC-9700 users out there that have switched to foxtelem 1.08p
using USB and IQ mode? I see a good eye but get zero decodes, dropping
back to 1.07y and it all starts working again.
HiIt might mot be the answer but when I installed the upgrade I had the same problems.I noticed that the "FPSK" box was checked - I changed the setting to "FSK" and it now is working fine.Ken EatonGW1FKY
LDPC for FPGAs to do DVB-S2/X on SDRs - so many letters! What does it mean?
Plenty going on in the open source amateur satellite scene! Here's where
Open Research Institute is going next with advanced forward error
correcting codes. We are doing our best to get them into as many FPGAs as
possible. This will amplify the capabilities of all those SDRs out there.
Open Research Institute is a 501(c)(3) dedicated to open source R&D for
amateur radio. We are particularly interested in technology that enables
modern digital microwave-band amateur satellite ground stations and
payloads. All of the work directly benefits all AMSAT organizations.
LDPC stands for low density parity check coding. It is a powerful forward
error correcting code, meaning it provides a huge amount of durability and
error correction for digital signals. LDPC is one of two error correcting
codes in DVB-S2 and DVB-S2X. The other is called BCH.
DVB-S2 is the most widely used satellite downlink standard and has become
widely adopted in amateur satellite work. DVB stands for digital video
broadcast. The S is satellite and the 2 is second edition. We replace the
MPEG layer, which is appropriate for commercial video broadcast, with a
generic data layer, which is more useful for hams. This switch boosts
bandwidth. MPEG has a lot of overhead. This "generic stream encapsulation"
protocol is called GSE. It comes from the same organization that makes DVB
standards. It's an open standard, like DVB-S2, and is already available in
GNU Radio and Wireshark due to some excellent volunteer work. GSE is a
drop-in replacement for MPEG in DVB-S2/X.
DVB-S2 will be heavily used on Gateway, is used by ARISS, and is a strong
contender for a wide variety of payloads currently being designed,
developed, integrated, and tested. It's also used terrestrially by a lot of
The DVB-S2X (X means extension) codes work down to an SNR of -10dB on the
low signal strength end. The extension also adds more codes to the
higher-end. This allows for very powerful signals that are used by
high-throughput satellites. For amateur radio, we are generally more
interested in the very low SNR capabilities of DVB-S2X, but don't overlook
the available codes at the high SNR end!
Why is LDPC so great? It approaches the physical limits of what error
correcting codes can do. The only better code out there right now are Polar
codes, used in 5G. They're slightly better, but heavily encumbered by
licensing. Becoming familiar with LDPC gives you knowledge of a code with
cutting edge performance.
I gave a talk on coding theory and how LDPC works at TAPR DCC in 2018.
Here's a link to the video.
We have supported several types of LDPC work. Charles Brain's Nvidia
implementation (graphical processing unit) was demonstrated at Reno
Symposium in 2017. A copy of this work is in the Phase 4 Ground repository.
Ahmet Inan's general purpose processor implementation has been incorporated
into GNU Radio and leandvb and more. His original work can be found here:
This is all open source work that is needed for projects like Phase 4
Ground and Space. It's freely available for anyone to use, and people are
Now, we're working on getting LDPC decode into field programmable gate
arrays, or FPGAs. Why? Because it's the best architectural fit for the very
parallel algorithms in LDPC codes. Another huge benefit is that decode can
be moved from a general purpose processor to an FPGA co-processor. This
frees up resources in any off the shelf software defined radio (SDR) and
makes for much more powerful receivers for amateur satellites that use
Getting to this stage took three years of hard work from a long list of
amazing volunteers and enthusiasts and donors. Many of them are on this
list. Thank you so much for the support. There is no way that this could
happen without you.
The beginning of the VHDL implementation is here:
What do we need? Review and feedback, awareness and support. Advice on
formal verification would be helpful. Documentation is a must.
What's the next major milestone? We hope to demonstrate a complete Lunar
Gateway style station that uses this FPGA work next year at the Tokyo Ham
Fair. We aim to have this be part of our Openrotor project.
Openrotor is a heavy-duty open source rotator and controller project. If
you are interested in that, let me know - it's off to a good start with
volunteers on three continents, but there's some expertise gaps that still
need filling. It must support a 2m dish at 10 GHz and not be so loud the
neighbors complain. It will speak MQTT and use other common interfaces
ARISS News Release No. 19-17
Dave Jordan, AA4KN
Oct. 30, 2019
Message to US Educators
Amateur Radio on the International Space Station
Call for Proposals
Current Proposal Window is October 1, 2019 to November 30, 2019
Upcoming Proposal Window is February 1, 2020 to March 31, 2020
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 for proposals submitted in the proposal window now open would be held between July 1, 2020 and December 31, 2020. ARISS is happy to announce a second proposal window will open February 1, 2020 for contacts that would be held between January 1, 2021 and June 30, 2021. 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 proposals for contacts between July 1, 2020 and December 31, 2020 is November 30, 2019. The proposal window for contacts between January 1, 2021 and June 30, 2021 will open on February 1, 2020 and close on March 31, 2020. Proposal information and documents can be found at www.ariss.org. Two ARISS Introductory Webinar sessions will be held on November 7, 2019. The first is at 6:00 PM ET and the second is at 9:00 PM ET. The same material will be covered during both sessions, so choose the session that best fits your schedule. The Eventbrite link to sign up is https://ariss-introductory-webinar-fall-2019.eventbrite.com .
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 with the support of NASA and space agencies in Russia, Canada, Japan and Europe present educational organizations with this opportunity. The ham radio organizations' volunteer efforts provide the equipment and operational support to enable communication between crew on the ISS and students around the world using Amateur Radio.
For proposal information and more details such as expectations, proposal guidelines and proposal form, and dates and times of Information Webinars, go to www.ariss.org.
Please direct any questions to ariss.us.education(a)gmail.com .
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), the ISS National Lab and National Aeronautics and Space Administration (NASA). The primary goal of ARISS is to promote exploration of science, technology, engineering, and mathematics (STEAM) topics by organizing scheduled contacts via amateur radio between crew members aboard the ISS and students in classrooms or public forms. Before and during these radio contacts, students, educators, parents, and communities learn about space, space technologies, and amateur radio. For more information, see www.ariss.org.
Dave Jordan, AA4KN
This email has been checked for viruses by Avast antivirus software.
Hmmm. This trick has worked for some people, but apparently there is
another variable we are not aware of.
<From: AMSAT-BB [mailto:[email protected]] On Behalf Of jeff
<griffin via AMSAT-BB
<Sent: Wednesday, October 30, 2019 07:43 AM
<Subject: Re: [amsat-bb] IC-9700 & foxtelem 1.08p
<I tried that yesterday and it didn't work....
<73 Jeff kb2m
<From: AMSAT-BB [mailto:[email protected]] On Behalf Of Alan
<Sent: Wednesday, October 30, 2019 2:21 AM
<To: Kevin; amsat-bb(a)amsat.org
<Subject: Re: [amsat-bb] IC-9700 & foxtelem 1.08p
<I you are using the Raised Cosine decoder, try the Windows Sinc instead.
<From: Kevin via AMSAT-BB
<Sent: Wednesday, October 30, 2019 12:21 AM
<Subject: [amsat-bb] IC-9700 & foxtelem 1.08p
< Any IC-9700 users out there that have switched to foxtelem 1.08p
<using USB and IQ mode? I see a good eye but get zero decodes, dropping
<back to 1.07y and it all starts working again.
<Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
<to all interested persons worldwide without requiring membership. Opinions
<are solely those of the author, and do not reflect the official views of
<Not an AMSAT-NA member? Join now to support the amateur satellite
<Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb