New SDR# DDE plugin

There is a new SDR# DDETracker plugin.

Ian Gilmour (MM6DOS) has created an add-on to the excellent SDR# program which allows DDE compatible software to control the receive frequency in SDR# Required for best results to correct for the Doppler shift when working with satellites with for example: WXTrack, SatPC32 and Orbitron.

SDR DDETracker

The new version now also supports mode setting. I use this version in combination with SatPC32 and works great. Download the plugin via his website, copy two dll files and add the following to you SDRSharp.exe.Config file.

<add key="DDE Tracker" value="SDRSharp.DDETracker.DdeTrackingPlugin,SDRSharp.DDETracker" />

SDR# DDE Plugin: DDETracker (Version 5 beta: DDETracker V5 beta Binaries)

Update: 04-01-2014

The combination that is working for me, is SDR# Nightly build, the V5 beta binaries from Ian and SatPC32 V.12.8c. When talking to PA3GUO we found out that the current stable version (Rev 1000) isn’t working. When using SatPC32 the DDE interface is configured via the DivOptions.SQF file and I use the following settings:

- (1)
+ (2)
+ (3)
- (4)
- (5)
; Hints
; The  +/- signs in lines 1,2,3,4 and 5 allow manual changes of program
; options whiche cannot be done in the menu 'Setup' and its sub menus. 
; Don't forget to save possible changes, please!  
; All changes require a program re-start to take effect. 
; Line #1: Rotor and CAT steering functions
           +: are available in a 2nd program instance,
;          -: are not available in a 2nd instance (default),
; Line #2: The "general" DDE interface will output data
,          +: constantly, 
;          -: only when the satellites elevation is > 0 (default),
; Line #3: Frequency values sent by the DDE interface
;          +: do not include converter/transverter offsets (default),
;          -: include converter/transverter offsets, 
; Line #4: SatPC32 steers
;          +: only the Downlink frequency and mode,
;          -: Downlink and Uplink frequencies and modes (default)
; Line #5: Auxiliary files will be opened with
;          -: Notepad (default).                    
;          +: the build-in editor.

Sound-Card Modem

AGWPE LogoI got a lot of questions regarding my Sound-Card modem setup, so I greated a webpage with information on how I try to decode the 9600 baud AX25 packets that are transmitted by STRaND-1. Follow this Sound-Card Modem link for details. For those who want to test there Sound-Card modem setup, I have places IQ wav files on a web server you can download and test your setup. Make sure the audio levels from your audio out/in are high enough. Use the Sound card tuning Aid that is build-in feature from AGW Packet Engine.

AGW Sound card tuning Aid

Details can be found at

AAUSat and STRaND-1 on february 26 2013 20:06 UTC, STRaND-1 on february 26 16:47 UTC and here is a complete pass IQ wav file (look at the sub directories and keep in mind that these files are 64, 124 and 200Mb in size and after decompressing a few hundred Mb)

Good luck with your setup and leave me a note if this is helpful.

73 Jan PE0SAT

Received STRaND-1 9k6 signals


After todays succesfull launch with a PSLV-C20 from Satish Dhawan Space Center (Sriharikota, India) the first signals are recieved from STRaND-1, this 3U nanosat that is build at the Surrey Space Centre (University of Surrey) using a Google Nexus-I as board computer. Here is a picture that I made from my reception this evening 25-feb-2012 19:00 UTC using a FUNcube Dongle Pro+, SDR# and a Maspro 435HS20.

STRaND-1 Reception 23-02-2013

The next couple of days I’ll try to decode the IQ data that was recorded during this pass. Lets see if we can find the 9600 baud data within this IQ stream. I have updated the STRaND-1 page with information to decode the telemetry using AGW Packet Engine and AGW KissOnline.