This is an old revision of the document!
Table of Contents
AMSAT-DL Multimedia HS Modem
Official wiki: https://wiki.amsat-dl.org/doku.php?id=en:hsmodem:start
Official download: https://dj0abr.de/german/technik/sat/modem/images.htm
M0LTE's fork with PTT support: https://github.com/M0LTE/AMSAT-DL-QO-100-Modem/releases
Setup
Download and extract the ZIP somewhere if using M0LTE's fork, otherwise run the installer
Run oscardata.exe (you might need to install .NET Framework if you don't have it already)
Go to Rig Control tab
Install Hamlib if it says it is necessary, link is in the tab
Choose your radio, enter your COM port into the Device box, e.g. COM12, choose your speed if needed
Click Save
Go to the Setup tab, set your callsign, name, location and locator.
Type some text in the Info box to overlay on images you send, e.g. CQ OARC
Select Insert Callsign into Picture, Insert Info into Picture
Do as you please with announcement before TX - it transmits a voice description of the mode - I have turned this off
Select your transceiver audio interfaces, similar to WSJT-X etc.
Usage (image transmission)
This tab sends digital SSTV. The quality is pleasingly good.
Go to the Image tab, select a quality (approx. transmission duration) and an image resolution.
Click Load Image, select an image.
Select a speed in bits/sec. The modulation and audio bandwidth is also listed. The selection will need to be the same at both ends.
Click Send to key up and start sending the image. You'll need to tweak audio levels to not over / under-drive the rig- use the same techniques as any other data mode. Don't drive the rig hard.
Reception
I'll write more about reception when someone sends me something!