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TELEX RadioCom Frequency Question

Discussion in 'Sound, Music, and Intercom' started by JVV, Sep 8, 2017.

  1. JVV

    JVV Member

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    Location:
    Trenton New Jersey
    Hello all,
    I am in the process of swapping out my Shure Body Mics that fall within the 600 MHz range. I took a look at my TELEX RadioCom Wireless System (BTR 800 with four TR 800 Beltpacks) and found that they are receiving in the 600 MHz range, but transmitting in the 500 MHz range.

    Do these need to be replaced as well, or can they be adjusted out of the 600 range?

    I haven't seen anything from the company regarding any issues with the recent FCC auction.

    Thanks
     
  2. themuzicman

    themuzicman Well-Known Member

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    Occupation:
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    Unfortunately the BTR's can't simply be adjusted out of the range. The only range that might be good is the Telex E88 range, but even that may be compromised if the Television repack sits overtop of the 18mHz chunk of the upper 500mHz portion the BTR-800 E88 transmits in. The good thing is that you should be able to slot 1 or 2 Tx freqs around the TV stations, but the bad thing is that it's not guaranteed and 2 you'd still have to buy new gear and there is better stuff on the market.
     
  3. TimMc

    TimMc Member

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    IIRC the upper cut-off is UHF ch 36 (612mHz), as ch 37 is reserved for radio astronomy and above 37 is the 600mHz spectrum recently auctioned to (mostly) T-Mobile (T-Mobile is beginning to light up their new spectrum on Nov 1, see the sticky at the top of the sound forum, folks!).

    The problem that isn't obvious to most users is that even if the new spectrum licensees tarry, the FCC Type Acceptance of Part 15 and Part 74 transmitters that are able to transmit above 613mHz is *revoked*. That makes the transmitters illegal to use, period, when the new spectrum licensees file for their FCC construction/test/operational permits. For some of us this is coming sooner than we anticipated - we're in the Nov 1 territory. Bah, humbug.
     
  4. themuzicman

    themuzicman Well-Known Member

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    The auction sold 614-698mhz, Channel 37 is 608-614mHz, so in effect we can only tune below 608mHz now.

    T-Mobile is only turning on 600mHz service in select locations at the moment where there is currently no TV broadcasting as they didn't have to wait on any 3rd parties to vacate and re-pack. While they do plan on moving quick, for the moment it's only 6 very rural markets.

    Not sure if this bit was directed at me, but the Telex E88 BTR-800 will still be just fine and fully legal for use after the full repack has happened - it's the only model of BTR that will continue to work - the E Transmit spans DTV 34-36 (590-608) and the 88 Band receive spans DTV 14-16 (470-488). The issue here is that we don't have full details on what the repack will look like in all markets. The E88 will still be fully legal for use, you just have to contend with interference from Television stations. Should the market the device is used in end up with TV stations on 34, 35, and 36 then the BTR won't work too well without slotting the transmit frequencies around dips in the TV transmission which isn't the cleanest solution to the problem.
     
  5. TimMc

    TimMc Member

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    IIRC the repack is final with the exception of relocating some Public Safety users and the geographic phases of the roll out have been published.

    I thought I was off by 1 TV channel, thanks for confirming my doddering memory!

    My point about Type Acceptance is for those folks in denial about transmitters that can tune below AND above 608mHz - too many think they can still use them if they don't operate above 608mHz. They can't, because the Type Acceptance has been revoked by AutoMagical Regulatory Action. /gratuitous capitalization
     
  6. dherm8or

    dherm8or Member

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    Occupation:
    Classroom Technologist, Broadcast Technician SBE
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    They can not be adjusted. I was told that they have to replace a board so could be up to half the cost of new. If telex does not have a answer yet. Talk to production wireless services in Florida. They do the custom options available for btr800.

    You can can still use portions of the 600 MHz guard band (the 614-616 MHz frequencies) and the 600 MHz duplex gap (the 653-663 MHz frequencies).
    https://www.fcc.gov/general/wireless-microphones-0
    For some channels you need the part 74 license available to broadcasters, large venues or film tv studios with over 50 devices.
     
  7. brin831

    brin831 Member

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    clear com freespeak2 ... riedel bolero ... tempest coach com, rad ... in that order to avoid any of these problems ... I know this will come as a surprise to some but the information about this has been trickling put for years ... move coms from uhf period save what is left for your devices that must be uhf.

    if you have any questions feel free to reach out I've used all the above products on major shows and there are some major upsides to btr that are truly game changing ... as well as some ok ones. spoke with clear com rep last week who was engineer behind this technology so just my 2c. it's a capital expense yes but so was the btr when it was purchased.
     

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