Knucker

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The Knucker project is to develop a variable bandwidth DVB-T USB receiver and transmitter for use on the lower VHF bands and HF. It will also have applications for mobile stations on 437MHz and above.

Why Knucker

Why not?

Knucker is a dialect word for a kind of water dragon, living in knuckerholes in Sussex and Charles, the lead developer, also lives in Sussex....

https://en.wikipedia.org/wiki/Knucker


Knucker dragon.jpg

Timescales

December 2020 - Currently the project is at the design phase with a proof of concept receiver working on bread board hardware.

Receiver

Hardware

Charles G4GUO and the Knucker team have developed a variable bandwidth DVB-T receiver with USB interface around the Serit 4762 NIM / tuner.

Draft specifications are 100KHz to 2MHz wide OFDM, frequency range 44 to 1002MHz

Note: the 4762 NIM is capable of DVB-T and DVB-S but the DVB-S is NOT (repeat NOT) supported in any BATC applications due to restricted frequency range and lack of low SR capability.

The PCB design by Mike G0MJW is based on the MiniTiouner Version 2 board.

Version 1

Feasibility design which was never built.

Version 2

Knucker assembled V1 PCB.jpg

This was the first protype build and not on general release - BOM and schematics are available here: File:Knucker.xlsx

Version 3

Render.jpg

First general release PCB - if you bought your PCB from the BATC shop, this is the information you need.

Note the use of a 3 pin 1.2v regulator which is different from the 5 pin variable 1.2v regulator on the MiniTuioner V2 PCB

Schematic is here: File:Knucker schematic V3.pdf

BOM is here File:knucker BOM V3.xlsx

USB Module

The USB module will require reprogramming with the xml file in this zip using the FTDI program called FT prog - the standard MiniTiouner USB module from the BATC will not work but can be re-programmed.

File:combituner.zip

Full instructions on how to program the unit are here: http://www.vivadatv.org/viewtopic.php?f=80&t=379

Software

It is intended to develop a core Linux DVB-T receiver application that will be integrated into the LongMynd receiver core.

The first product implementation will be in the Portsdown DATV system which will be enhanced to include a DVB-T receiver.

It is also envisaged that a set-top box version of the code will be developed at some point using the RydePlayer and would be known as the Knucker receiver.

Transmit

DATVexpress

Charles G4GUO is currently developing a variable bandwidth OFDM version of the DATVexpress software.

This will work with the DATVExpress card, Pluto and Lime SDR.