Thanks Bruce.
I think I need to go get a preamp and filter! And try again.
73, tom n4zpt
On 8/14/2011 12:06 PM, Bruce Robertson wrote:
On Sat, Aug 13, 2011 at 7:07 PM, Phil Karnkarn@philkarn.net wrote:
On 8/10/11 8:24 PM, Tom Azlin N4ZPT wrote:
I have a Fun Cube Dongle so I would Phil. Thanks and 73, Tom n4zpt
Okay, everybody make and keep your wideband I/Q recordings and I'll work on an enhancement to my demodulation/decoding software to process them. It may not run in real time on slower machines because of the need to search a wider frequency range, but this won't matter if it can work on a recording.
I can probably speed things up by including an orbit model in the modem to predict Doppler open-loop, but this will take time to implement and it will still be vulnerable to small errors in the elements and/or your clock, especially around closest approach. So record the date and time of your recordings and the current eleset at that time.
For those who have not noted this feature, HDSDR will open a recording scheduler if you right click on the 'record' button. It saves files with UTC time appended. The tricky part is that you have to set the scheduler manually in local time.
I've been thinking it would be a nifty hack to make a FCD recorder for a set of satellites using a very small computer, like the BeagleBoard. It seems to me that a daily cron job with 'Predict' would just about do what was necessary, especially now that we have a commandline tool for the FCD. The only part that would take some fiddling would be piping the USB sound card into a file with the proper headers for HDSDR.
73, Bruce VE9QRP