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Author Topic: RTS / Telex BTR-800 Wireless com  (Read 1565 times)

Al Rettich

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RTS / Telex BTR-800 Wireless com
« on: June 20, 2017, 02:23:21 pm »

Is anyone still using the BTR-800's? Wondering if Telex's are going to offer a rebranding of frequencies? Anyone hear of anything?
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Pete Erskine

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Re: RTS / Telex BTR-800 Wireless com
« Reply #1 on: June 20, 2017, 03:01:13 pm »

Is anyone still using the BTR-800's? Wondering if Telex's are going to offer a rebranding of frequencies? Anyone hear of anything?

BTR's are at end of life.  I do not believe they are making them any more or will soon stop completely.  Also in any case their RF sections cannot be refreqed to do more than 2 bands below 600, 88 and 99. 

Best thing for all users is to sell them now to some other country which is not yet selling off bandwidth.

Many parts of the USA will have T-Mobile using their purchased 600 MHz by the end of this year.  Major markets like NY and LA in a couple of years.

See this chart - nothing in shaded ares can be used very soon.
« Last Edit: June 20, 2017, 03:22:49 pm by Pete Erskine »
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Pete Erskine
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Al Rettich

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Re: RTS / Telex BTR-800 Wireless com
« Reply #2 on: June 20, 2017, 05:08:53 pm »

Sounds like getting the retro mod that Professional Wireless does is useless as well..
My boss is going to be pissed...
BTR's are at end of life.  I do not believe they are making them any more or will soon stop completely.  Also in any case their RF sections cannot be refreqed to do more than 2 bands below 600, 88 and 99. 

Best thing for all users is to sell them now to some other country which is not yet selling off bandwidth.

Many parts of the USA will have T-Mobile using their purchased 600 MHz by the end of this year.  Major markets like NY and LA in a couple of years.

See this chart - nothing in shaded ares can be used very soon.
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Ike Zimbel

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Re: RTS / Telex BTR-800 Wireless com
« Reply #3 on: July 09, 2017, 10:56:11 am »

Sounds like getting the retro mod that Professional Wireless does is useless as well..
My boss is going to be pissed...
Full disclosure: I am the Canadian Manufacturer's rep for Radio Active Designs (aka Rad Com). That said, since many of you are in the States, I will press on...
If you are looking to replace BTR systems more-or-less "in kind" you could do worse than look at RadCom. The form factor is basically the same, the i/o is the same (give or take a few BNC-TNC adapters) or better (Ethercon (TM) connectors for the 4-wire instead of RJ-11), the biggest change will be switching to a VHF receive antenna.
On top of that there are some +'s, like the fact that all belt packs and all base stations are compatible...no more band splits. I know that I have on many occasions had to exchange (and re-coordinate...) an entire BTR system for one in a different band split just because one belt pack was bad and the supplier didn't have a spare in that band.
I could go on...
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~Ike Zimbel~
Wireless frequency coordination specialist.
Manufacturer's Representative (Canada)
Radio Active Designs
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Pete Erskine

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Re: RTS / Telex BTR-800 Wireless com
« Reply #4 on: July 09, 2017, 11:26:52 am »

On top of that there are some +'s, like the fact that all belt packs and all base stations are compatible...no more band splits. I know that I have on many occasions had to exchange (and re-coordinate...) an entire BTR system for one in a different band split just because one belt pack was bad and the supplier didn't have a spare in that band.
I could go on...

I agree with Ike... the Rad UV-1g system is really very good.  I've used it on a few shows and been very happy.  Since it's initial introduction any complaint users have had has quickly been met with software and hardware updates and now the system is very stable and more than a perfect replacement for the disappearing BTR. 

A huge plus which was not mentioned is that the bandwidth needed for frequencies is very small and many more channels can be found in the same space than with BTR.
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Pete Erskine
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Jason Glass

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Re: RTS / Telex BTR-800 Wireless com
« Reply #5 on: July 09, 2017, 01:01:18 pm »

A huge plus which was not mentioned is that the bandwidth needed for frequencies is very small and many more channels can be found in the same space than with BTR.

Agreed. You can cram all of your base station TX into a small bandwidth and set up guard bands on each side, equal in width to the distance between the highest and lowest base freqs, which will contain most of their intermod products. This is especially helpful when operating at 100mW or at 250mW under part 74 rules.

Speaking of licensed use, UV-1G base stations will TX 250mW and require no mods for properly splitting and combining signals. I routinely cover entire stadiums and festival grounds with a single antenna mounted high up.

While their TX-8 is a killer unit (for IEM, too!), you can utilize your current stock of IEM combiners for base station use and save a few $.

Up to 100mW:
Shure PA821, PA821A, PA421A
Sennheiser ACA-3000

Up to 250mW
RAD TX-8
Sennheiser ACA-3200
PWS GX-4, GX-8 (100mW in, 250mW out)

EDIT: PLEASE SEE HENRY'S POST BELOW ABOUT WHY MY IEM COMBINER ADVICE MAY BE NOT SO GOOD.

The RX side requires a VHF antenna and splitting equipment such as the RAD V-8 or PWS DB-IC-V series. A major bonus of VHF is much lower loss per foot of coax. FYI, the new Shure UA860V is an excellent remote VHF omni antenna and is remarkably compact.

Advanced users and integrators will like that the system's VHF/UHF RX/TX scheme places RX and TX bands far enough apart to use inexpensive filter-type diplexing for single cable runs to remote antenna pairs.

Rave complete.  :-)

Sent from my Nexus 5 using Tapatalk
« Last Edit: July 11, 2017, 11:01:29 am by Jason Glass »
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Henry Cohen

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Re: RTS / Telex BTR-800 Wireless com
« Reply #6 on: July 09, 2017, 09:01:03 pm »

While their TX-8 is a killer unit (for IEM, too!), you can utilize your current stock of IEM combiners for base station use and save a few $.

RAD does not recommend using a transmit combiner for the UV-1G base other than the TX-8. The reason (no, it's not just to sell more product) is that because of the dual sideband nature of the carrier (essentially two carriers per channel), it was found the intermod suppression of the other [very good] products was insufficient when the base is run at more than 20mW/ch. That said, YMMV and if another make/model combiner is working for you, then continue using it. At this point, there appears to be no danger to the base transmitter stages.

And thank you Jason, and Pete, for your kind words and support of RAD.
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Henry Cohen

CP Communications    www.cpcomms.com
Radio Active Designs   www.radioactiverf.com

Jason Glass

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Re: RTS / Telex BTR-800 Wireless com
« Reply #7 on: July 11, 2017, 10:55:31 am »



RAD does not recommend using a transmit combiner for the UV-1G base other than the TX-8. The reason (no, it's not just to sell more product) is that because of the dual sideband nature of the carrier (essentially two carriers per channel), it was found the intermod suppression of the other [very good] products was insufficient when the base is run at more than 20mW/ch. That said, YMMV and if another make/model combiner is working for you, then continue using it. At this point, there appears to be no danger to the base transmitter stages.

And thank you Jason, and Pete, for your kind words and support of RAD.

Thank you for this clarification! It's been a year or two since I used an IEM combiner for RAD TX, and on all occasions it was only one or two PL channels added to an existing IEM rig with spare inputs. I recall occasionally having less than stellar audio, but it was passable and I (perhaps wrongly) attributed it to gain staging issues that have since been corrected in the firmware.

Am I correctly assuming that the DSB modulation scheme's AM nature requires gobs of headroom to avoid amp compression?  It seems that this could particularly make the GX series, having AGC, particularly damaging to the signal.

Sent from my Nexus 5 using Tapatalk

Cameron Stuckey

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Re: RTS / Telex BTR-800 Wireless com
« Reply #8 on: July 11, 2017, 05:20:29 pm »

Am I correctly assuming that the DSB modulation scheme's AM nature requires gobs of headroom to avoid amp compression?  It seems that this could particularly make the GX series, having AGC, particularly damaging to the signal.

Speaking for Professional Wireless, you cannot put the UV-1G into the GX series. The AGC circuit constantly chases the AM signal trying to compensate for the modulation. This directly impacts audio quality of the system. The GX series was designed for fixed amplitude signals, e.g. FM.

Cameron
Professional Wireless
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Jason Glass

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Re: RTS / Telex BTR-800 Wireless com
« Reply #9 on: July 11, 2017, 05:28:51 pm »

Speaking for Professional Wireless, you cannot put the UV-1G into the GX series. The AGC circuit constantly chases the AM signal trying to compensate for the modulation. This directly impacts audio quality of the system. The GX series was designed for fixed amplitude signals, e.g. FM.

Cameron
Professional Wireless
Thanks, Cameron. I was worried that this would be the case. It must have an extremely fast limiter!

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