CubeSat Telemetry Demo

From Scott Chapman

You can do a LOT of different things with Software Defined Radio (SDR). One aspect that I particularly enjoy is satellite telemetry.

Here is a basic overview showing some of the software options for receiving & decoding telemetry from the many amateur, educational, & government satellites that orbit our planet.

Many computer, SDR, & software combinations work well. In this demo, I was using Windows-7, SDRPlay, HDSDR, Orbitron, UZ7HO high-speed soundmodem, DK3WN AGW OnlineKiss, MXL GroundStation client from Univ. of Michigan, & the Online Telemetry Forwarder from DK3WN & PE0SAT.

We owe great thanks to all the amateurs who have documented each satellite, put their own reception reports online, and written software to make this all possible. The call signs listed above belong to people who have done a great service that contributes not only to our hobby entertainment, but in many cases the telemetry that we all download will be of great benefit to the schools and other organizations who are using data from the growing number of satellites in orbit.

Winlink Digital Mode

From Cliff N4CCB

Winlink lets you easily send/receive email from anywhere on the face of the Earth with your HF radio! In the first 7 minutes, I give you the background information on Winlink… what it is, why it’s important, and how it works. Then, I fire up the computer and a QRP radio (naturally!) to do a demo of sending and receiving email.

W4SNF Sun & Fun RV resort Club station

W4SNF_Members

W4SNF is a “Club” station operated at Sun & Fun RV resort in Sarasota Florida. We have a complete HF and VHF/UHF station with a Mosley classic for 10-15-20. It is open to any Ham that wishes to use it. A key will be issued when you come on board. . It is also equiped with computers so that digital modes can be used.

All hams in the park as well as a few others monitor 147.390 with 100 PL. That is the repeater of choice for us, which is located about 3 miles from the park. Provides great coverage.

We toured Sarasota EOC, Emergency Operations Center, The $18.7 million replaces the county’s old EOC headquarters, which was located downtown and was not up to currrent hurricane codes. The new EOC houses the Public Safety Comunications Center, the county’scall center, and the Sheriff’s Office 911 dispatch center.

Can you recognize some of the members? Hugh VE3AYR, Mary VE3QLF, John VE3NXA and Gary VE3TGH.

Very First HamTV School Contact with Audio – Norwich Schools UK

This is the very first publicly released HamTV school reception with audio. There have been HamTV receptions with audio before, like in 2014 when it was first tested, but as far as I know no school receptions or recordings have included audio.

Not only that, but HamTV has not even been used for school contacts until 2016, and only at UK schools for Tim Peake’s Principa mission. The HamTV audio has never been used because the primary method of communicating has always been the 2 meter FM VHF radio. Additionally, HamTV cannot easily be received for the full 10 minutes that VHF audio can be received.

To work around this there are several HamTV receiving stations in Europe which stream their video over the internet to the school. As one station loses the signal and another picks it up the video is switched, but streaming over the internet introduces a delay which doesn’t match up with the VHF audio. So normally only the video from the HamTV reception is shown and it is out of sync with what the students hear over VHF.

But we can take the recordings and sync them up with the audio and video of the students asking their questions from the school and make a nice video using the higher quality audio from HamTV.

Thanks to Daniel Cussen, EI9FHB for providing the video streams from his station in Ireland and also from F6DZP’s station in France.

Thanks also to Paul Webster, G7KVE, PE7B for the use of some of his audio for the contact. You can see his full reception in Luxembourg here:
https://www.youtube.com/watch?v=sYJuO

This is the official video of the Norwich Schools contact (where I got the video of the students asking their questions):
https://www.youtube.com/watch?v=24c6h

HamTV was tested in 2014 and there was audio
https://www.youtube.com/watch?v=EpFzb

Antenna Testing Using WSPR

From Randy K7AGE

I’ll show you how to use WSPR software to check to see if my antenna is working. WSPR sends your call sign, power level and grid square during a nearly two minute transmission. Receiving stations decode your transmission and post the results to an online database. You can use a website to view a map of of the station that you have heard and stations that have heard you.

WSPR is written by Joe Taylor, K1JT

WSPR, software and users manual
http://physics.princeton.edu/pulsar/k…

WSPR Net, map display
http://wsprnet.org

Grid Square Map
no.nonsense.ee/qth/map.html

Setallar WSPR, receiver kit
http://stellarwspr.com/

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