DATV-Express Project

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KenW6HHC
Posts: 256
Joined: Mon Jun 01, 2009 4:20 pm

DATV-Express Project

Post by KenW6HHC » Sat Mar 03, 2018 10:05 pm

During February, testing of the compact MiniTiouner-Express hardware receiver and analyzer production units that use the Serit NIM tuner and uses the MiniTioune software from Jean Pierre F6DZP continued. Art WA8RMC has resolved the power supply extended temperature problem and all units have been reworked. However, a new problem has been seen in a few units. Out of 29 production units that are under intense scrutiny, 25 units work perfectly. However, consistently 4 units power up with poor modulation constellation and a low MER reading. Restarting these four units allow them to sometimes work OK…but most times the poor modulation constellation comes on. A possible issue has been identified with the one of the Serit tuners on the “four poor constellation units” and all “four poor constellation units” are in the same manufacturing date code lot (different from the 25 other good units) . Art is working with the Serit manufacturers to analyze.

Ken W6HHC has completed a MiniTiouner-Express User Guide draft that has been reviewed and updated by the project team, A review copy has been sent to Jean Pierre F6DZP for his inspection and comments.
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Cover for Draft10 of MiniTiouner-Express User Guide

The project team has decided to delay sales of the MiniTiouner-Express hardware until the poor-constellation-problem on some units is better understood.

There is good news that the PLUTO SDR Tx/Rx units from Analog Devices are now IN STOCK and NOW SHIPPING from both DigiKey and Mouser electronic distributors. The DATV-Express software v1.25p4 software (for windows) will transmit with either a PLUTO modulator or the normal DATV-Express modulator board. Currently, Charles G4GUO has been working to add the Lime-Mini SDR board to the v1.25p4 software. Mostly working, Charles explains he just needs to add the “raised COSINE” filter to the code for Lime-Mini SDR board software. Charles reports he could have a software build ready to provide alpha testing with LimeSDR-mini board in a couple of weeks.

Project Speed is set to moderate….de Ken W6HHC
Last edited by KenW6HHC on Tue Mar 06, 2018 3:00 pm, edited 1 time in total.

KenW6HHC
Posts: 256
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Tue Mar 06, 2018 2:55 pm

As a follow-up to the LimeSDR-mini Tx/Rx discussions, I just placed an order for a Lime-Mini unit for US$139 (the introductory price). These units have been shipping since mid February as promised by Crowd Supply at
https://www.crowdsupply.com/lime-micro/limesdr-mini

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The LimeSDR-mini is a very small Tx/Rx unit

A Crowd Supply update e-mail reported that “We've shipped over 300 boards so far and we're happy to report another 900 or so boards will arrive at Crowd Supply's warehouse this week.” My unit is expected to ship on March 31.

73…de Ken W6HHC

G8XZD-TV
Posts: 77
Joined: Fri Feb 22, 2013 6:41 pm

Re: DATV-Express Project

Post by G8XZD-TV » Tue Mar 06, 2018 5:21 pm

Nice product, just shame there is no European distributor for a British product.

KenW6HHC
Posts: 256
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Sun Apr 01, 2018 2:25 pm

The project team has decided to begin sales of the MiniTiouner-Express hardware as soon as the web site can be updated (some team vacations may impact?). During March, Art WA8RMC determined that the power supply switching regulator was on the verge of causing a small 100mV glitch just as the Serit tuner was being programmed. The glitch coincided with the time the software was communicating with the tuner over the I2C lines. A resister value change eliminated the glitch. The symptom had been occasional “fuzzy constellation and low MER” at power-up. Also Jean Pierre F6DZP reported no problems were found on the unit that was shipped to him for his review..

Charles G4GUO reports that:
• He is waiting for MiniTiouner-Express hardware to arrive (for additional testing)
• He can't get LimeSDR / Lime Mini to produce a good MER. Using DATV-Express software
• Not getting very far with running MiniTiouner-Express hardware on Linux.

Ken W6HHC has updated the MiniTiouner-Express User Guide to draft13 with new updates by the project team and a new front cover. Again, the User Guide will be available for download from the WWW.DATV-Express.com web site as soon as the web site can be updated. (A special thanks to Ian G8IQU...for his recommendations and some work on the new cover design.)

Image
New Cover for Draft13 of MiniTiouner-Express User Guide

Finally Charles G4GUO further reports that he:
• Has been preparing a Spectrian amplifier for 2.4 GHz Es'hail 2 uplink (this has taken most of my time).
• Is trying to figure out how best to attach a 65 cm dish to a tripod for 6 cms DATV operation.
• Cleaned the dust out of his main computer (it is now running noticeably faster).

Project Speed is set to moderate….de Ken W6HHC
Last edited by KenW6HHC on Sun Apr 01, 2018 2:32 pm, edited 2 times in total.

KenW6HHC
Posts: 256
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Thu Apr 05, 2018 3:43 pm

An Important MiniTiouner-Express update

The MiniTiouner-Express Receiver/Analyzer unit can NOW be ordered from the www.DATV-Express.com website. You need to first logon to the website (or REGISTER on the website if you have never logged in before). Use the PURCHASE A PRODUCT tab to order the product via PayPal.
  • The price for the MiniTiouner-Express unit (with Serit) is US$75 + shipping
    Shipping for USA is US$7.00
    Shipping to the European Union is US$24.00 including the VAT.
    Shipping anywhere international is US$35.00
The MiniTiouner-Express User Guide (draft13) can now be downloaded as a PDF from the www.DATV-Express.com website. Use the DOWNLOADS tab to download the PDF file.

Let me know if you have any questions…de Ken W6HHC
Last edited by KenW6HHC on Tue Apr 17, 2018 1:00 pm, edited 3 times in total.

G4GUO
Posts: 492
Joined: Tue Feb 16, 2010 12:51 pm
Location: Worthing

Re: DATV-Express Project

Post by G4GUO » Thu Apr 05, 2018 5:15 pm

Anyone ordering for EU delivery please be patient as it will be a couple of
weeks before we can ship.

- Charles

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