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Thread: Status of the Digital TV transition in Central America

  1. #11
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    I would like one to take to the Keys when Hepburn maps are good 'N' red....

    cd

  2. #12
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    Quote Originally Posted by Gargadon View Post
    I hope that tuner is compliant with 6 MHz bandwidth DTMB. All tuners and dongles sold in AliExpress are 8 MHz-DTMB only.
    That is good to know. Thanks Gargadon. I was thinking of buying one of those DTMB Tuners sold on AliExpress website I am sure glad I did not.

  3. #13
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    There are some universal set top box digital TV receivers manufactured by Austin TX based company, Silicon Labs. They also have an East coast corporate office in Boston. These receivers are capable of ATSC/QAM, DVB-T2/T/C2/C, ISDB-T/C, and DTMB. I have turned in an inquiry ticket through their sales department to find out how a person purchases one of these. It appears they have a network of dealers in the United States. I might send emails to some of the dealers near me to find out if they are able to order these STB's. I notice that Digikey is a dealer for them. I know many dxers have ordered various board filters and similar things from them.

    This is their overview page of SiLabs set-top-boxes....
    http://www.silabs.com/products/video...es/si21x4.aspx

    It appears these are just tuner chips for set-top-boxes. The consumer would have to locate the manufacturers that use them...
    http://mms.businesswire.com/media/20...ress-image.jpg

    Here is the link for the PDF for the Si2141...
    http://www.silabs.com/Support%20Docu...2141-short.pdf

    The Si2144 set-top-box model...
    https://www.silabs.com/Support%20Doc...2144-short.pdf

    And then they have the Si2151 Worldwide Digital and Analog TV Tuner. They don't say this is a set-top-box. It could be just the component that is installed in the television component by the manufacturer. After reading the document of this particular tuner, it would be most interesting to locate a set-top-box or TV that uses this particular tuner...
    http://www.silabs.com/Support%20Docu...2151-short.pdf
    Jim Thomas
    Springfield, MO

    Ozark Mountain DTV dxing Daredevil

    Dx Equipment - AntennaCraft MXU59 UHF antenna & homebrew version of AntennaCraft Y10-7-13 VHF antenna @ 25'. Both antennas fed through a Winegard HDP-269 12dB pre-amp; a Zenith DTT901 converter box & a Silicon Dust HDHomerun Dual ATSC tuner, using Rabbitears autologger support.

  4. #14
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    Jim, by all means, keep us posted on this. True Tropo season is about 5 weeks away, and of course you know my QTH.

    cd

  5. #15
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    Quote Originally Posted by Jim Thomas View Post
    There are some universal set top box digital TV receivers manufactured by Austin TX based company, Silicon Labs. They also have an East coast corporate office in Boston. These receivers are capable of ATSC/QAM, DVB-T2/T/C2/C, ISDB-T/C, and DTMB. I have turned in an inquiry ticket through their sales department to find out how a person purchases one of these. It appears they have a network of dealers in the United States. I might send emails to some of the dealers near me to find out if they are able to order these STB's. I notice that Digikey is a dealer for them. I know many dxers have ordered various board filters and similar things from them.

    This is their overview page of SiLabs set-top-boxes....
    http://www.silabs.com/products/video...es/si21x4.aspx

    It appears these are just tuner chips for set-top-boxes. The consumer would have to locate the manufacturers that use them...
    http://mms.businesswire.com/media/20...ress-image.jpg
    Yes, this is just the tuner chip. It downconverts the incoming signals to a low intermediate frequency (LIF) around 5MHz.
    A separate chip is required to demodulate the LIF signals to a datastream & process it to audio & video.
    They do mention "Single Low-IF (LIF) output to SoC and/or demodulator". SoC is "System on a Chip". By loading different firmware into the SoC you could, presumably, demodulate different DTV standards without replacing the hardware.
    Whether any of this would be exposed to the end user is another question. There are relatively few places where a populated area lies on the border between two different DTV standards.

    Here is the link for the PDF for the Si2141...
    http://www.silabs.com/Support%20Docu...2141-short.pdf

    The Si2144 set-top-box model...
    https://www.silabs.com/Support%20Doc...2144-short.pdf

    And then they have the Si2151 Worldwide Digital and Analog TV Tuner. They don't say this is a set-top-box. It could be just the component that is installed in the television component by the manufacturer. After reading the document of this particular tuner, it would be most interesting to locate a set-top-box or TV that uses this particular tuner...
    http://www.silabs.com/Support%20Docu...2151-short.pdf
    I guess what I'm getting at is that just because a device uses one of these chips, that doesn't necessarily mean it can receive all world DTV standards.
    This page shows Silabs' demodulator offerings. They do seem to have one that does both ISDB and DVB-T but I don't see anything that does DTMB or ATSC.

    I do find it interesting that these tuner chips offer a 1.7MHz bandwidth selection. I have no idea where that would be in use. British hams are experimenting with DVB-T in a 1MHz bandwidth. The picture is less than standard definition, but the coverage is pretty good (important given that transmitter output power is limited to 400 watts in the U.K.) and it fits in bands where TV would otherwise be impossible. (the 2-meter band is normally only 144-146MHz there, but 146-147 is available for special experiments -- like this)
    Doug Smith W9WI
    Pleasant View, TN EM66
    http://www.w9wi.com

  6. #16
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    I received an email reply this afternoon, from the Global Public Relations Manager of Silicon Labs. It reads like this....

    Hi Jim,

    I learned from the general manager of our broadcast IC business (which includes our TV tuners) that because we do not have any direct-to-consumer business, we are not able to provide the details you are requesting about set-top-boxes containing our silicon tuners. Furthermore, while most tuners are multi-standard, we are not aware of any true multi-standard set-top boxes available in the US due to the extra costs involved in producing them.

    I hope this general feedback is helpful.

    Best regards,
    Dale

    Dale Weisman
    Global Public Relations Manager
    Silicon Labs

    Mobile +1 512-743-6240
    Office +1 512-532-5871

    400 W. Cesar Chavez, Austin, TX 78701 USA


    So the question remains - does anyone know how to locate manufacturers of NEW terrestrial O-T-A digital televisions or set-top-boxes? They started making those tuner chips in 2015, so this would be very new product, whether it is from US, Japan, China???
    Jim Thomas
    Springfield, MO

    Ozark Mountain DTV dxing Daredevil

    Dx Equipment - AntennaCraft MXU59 UHF antenna & homebrew version of AntennaCraft Y10-7-13 VHF antenna @ 25'. Both antennas fed through a Winegard HDP-269 12dB pre-amp; a Zenith DTT901 converter box & a Silicon Dust HDHomerun Dual ATSC tuner, using Rabbitears autologger support.

  7. #17
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    I located a DTMB set-top-box on the DH Gate wholesale company website, which is located in China...
    http://www.dhgate.com/product/tsingh...arl|2075157193
    Jim Thomas
    Springfield, MO

    Ozark Mountain DTV dxing Daredevil

    Dx Equipment - AntennaCraft MXU59 UHF antenna & homebrew version of AntennaCraft Y10-7-13 VHF antenna @ 25'. Both antennas fed through a Winegard HDP-269 12dB pre-amp; a Zenith DTT901 converter box & a Silicon Dust HDHomerun Dual ATSC tuner, using Rabbitears autologger support.

  8. #18
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    ...
    Last edited by fm_dxer; 07-04-2017 at 05:07 PM.

  9. #19
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    Reading the Gelect HD-HL1209 manual in Lacetel website (http://www.lacetel.cu/Manual%20de%20..._HD-HL1209.pdf , content in Spanish), I could read the converter box specs. Basically they will use channels 7-51, and the other thing Lacetel recalls is the bandwidth of the channels (6 MHz DTMB).

    So basically the Tsinghwa STB will not work properly for Cuba: http://www.tele-audiovision.com/TELE...p/tsinghwa.pdf. Bandwidth is not specified for that STB, so unless it can be set the bandwidth of the channels, it doesn't support 6 MHz bandwidth.

  10. #20
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    Wow---with Cuba, it really *is* getting political! This sure is not easy.

    cd

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