DigiLite Announcement
Posted: Mon Jun 27, 2011 3:35 pm
DigiLite
For some months a number of amateur stations have been active with designs for a lower cost way to produce ATV digital transmissions. A number of individual modules are used, one of which is a PVR recorder card in a PC, this is followed by a new module which takes the USB from the PVR and serializes the streams adding the DVB house keeping codes. A further module then modulates the stream to give the QPSK for a DVB-S transmission.
This concept was seen some time ago from F4DAY, after extensive enhancements and new code and hardware from G4EWJ and M0DTS the devices are reported to produce up to 4MS/s. This is T/Stream rate most frequently used on UK ATV digital repeaters.
Several other groups have built and tested systems offering, feedback and results back to the diverse design group.
The Bournemouth ATV group made the decision to actively convert all there local stations to digital transmission. The DigiLite emerged as a practical way to achieve digital transmission system at a low cost. Dave G8AJN and Colin G4KLB have produced pcb modules for their local group, this will be documented at http://www.g8ajn.tv in the next few weeks.
Dave G8AJN has very kindly offered to produce a single PCB version, excluding the separate PVR, which we hope to make available through BATC, together with a series of articles for CQ TV. We are still planning how this will be achieved, initial thoughts are to have a mini kit with the small modulator chip placed, other SM components should be readily available or can be sourced directly.
Code for the serialser will be in PIC form which Eddie has made available for the PIC.
Look on the http://www.g8ajn.tv site for information concerning the system and the existing individual module arrangement and watch this space for the single PCB version coming through articles in CQTV.
Thanks must go to all those who have made this project possible, ideas and design recommendation came from many sources and this is also reflected in the kind offer for G4EWJ for the latest software.
For some months a number of amateur stations have been active with designs for a lower cost way to produce ATV digital transmissions. A number of individual modules are used, one of which is a PVR recorder card in a PC, this is followed by a new module which takes the USB from the PVR and serializes the streams adding the DVB house keeping codes. A further module then modulates the stream to give the QPSK for a DVB-S transmission.
This concept was seen some time ago from F4DAY, after extensive enhancements and new code and hardware from G4EWJ and M0DTS the devices are reported to produce up to 4MS/s. This is T/Stream rate most frequently used on UK ATV digital repeaters.
Several other groups have built and tested systems offering, feedback and results back to the diverse design group.
The Bournemouth ATV group made the decision to actively convert all there local stations to digital transmission. The DigiLite emerged as a practical way to achieve digital transmission system at a low cost. Dave G8AJN and Colin G4KLB have produced pcb modules for their local group, this will be documented at http://www.g8ajn.tv in the next few weeks.
Dave G8AJN has very kindly offered to produce a single PCB version, excluding the separate PVR, which we hope to make available through BATC, together with a series of articles for CQ TV. We are still planning how this will be achieved, initial thoughts are to have a mini kit with the small modulator chip placed, other SM components should be readily available or can be sourced directly.
Code for the serialser will be in PIC form which Eddie has made available for the PIC.
Look on the http://www.g8ajn.tv site for information concerning the system and the existing individual module arrangement and watch this space for the single PCB version coming through articles in CQTV.
Thanks must go to all those who have made this project possible, ideas and design recommendation came from many sources and this is also reflected in the kind offer for G4EWJ for the latest software.