DATV-Express Project

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KenW6HHC
Posts: 273
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Tue Oct 02, 2018 9:17 pm

Art WA8RMC is preparing for a production build of a new version of MiniTiouner-Express units called “Rev B”. The small design change allows a push-on jumper to select either (a) allow external power supply to feed voltage to the board and any LNB or (b) to have the hardware unit powered by the 5V on the USB-3 cable. The shipment of 100ea Serit tuners is expected to arrive around October 10. The world-wide inventory of remaining “Rev A” units is quite low…and might run out before the newer units are assembled and fully tested.

Charles G4GUO has fixed one bug for PLUTO units with the v1.25LP10 software release. One user of the v1.25LP10 software (John G4BAO) discovered that there is a coding design problem with the LimeSDR-USB and LimeSDR-mini units. With LimeSDR-USB units, if frequency selected is <2.0 GHz, then then code did not select the correct output port and the RF power output was too low. With LimeSDR-mini units, if frequency selected is >2.0 GHz, then the code did not select the correct output port and the RF power output was too low. Charles has prepared a new v1.25LP11 of the software and Ken is getting ready to re-test at his lab and then prepare for this new release to be uploaded to the www.DATV-Express.com web-site.

Ken W6HHC has prepared a new Block Diagram that illustrates that the DATV-Express software now supports four different hardware boards.

Image
Block Diagram of DATV-Express software supporting four different boards.

Ken plans to update the DATV-Express User Guide to emphasize that DATV-Express has transitioned to become solely a software product for the future.


During September, Tom WB6P completed the gerber artwork for “Rev B” of the MiniTiouner-Express printed circuit board. The artwork and other PCB files have been sent to the PCB-house for fabrication. .

Project Speed is set to slow….de Ken W6HHC

KenW6HHC
Posts: 273
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Thu Oct 11, 2018 6:49 pm

Just a note that the DatvExpress v1.25LP11 software for selecting and controlling the four different exciter board models has now been successfully uploaded as a zip file to the DOWNLOADS page on the www.DATV-Express.com website.

As a side note: while testing the v1.25LP11 software I came to realize that I did not have test equipment in my home lab to measure RF power (easily) at >2.0 GHz. My trusty Rigol DSA815 spectrum analyzer only measures up to 1.5 GHz. So I had to rely on the v1,25LP11 testing performed by Charles G4GUO and John G4BAO with the LimeSDR-USB and LimeSDR-mini boards at >2.0 GHz.. Download the NOTES_v1.25LP11.txt file to understand the details on the power-out-level issues when running with the LimeSDR-USB and LimeSDR-mini boards.

73...de Ken W6HHC

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