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Posted by Richard Crowley on 10/05/34 11:44
blackburst wrote ...
> OK. I got the gig with the semi-pro baseball team. No construction or
> very little construction required. Mostly beefing up existing stuff.
> I'd love to have some advice and suggestions from knowledgable people
> in both NGs.
>
> For rec.audio.pro:
>
> 1) The wireless mic for the Telex stsem is lost, so they currently use
> an AKG system , but the mic makes a "pop" when it is turned on or off.
> They want to go back to the Telex. Two questions: a) What transmitter
> do I need? It's a Telex FMR-450 at 614.700. I prefer either a
> completestick, or a butt-end which can go on any stick.
You need the matching transmitter from Telex. There is no viable or
practical alternative. Did they say that the Telex did NOT suffer from
the same turn on/off transient? Perhaps muting the microphone rather
than turning the RF carrier on and off would solve the problem?
b) In the
> booth, the receiver has two short antennas, but it's in a rack. Can I
> replace the antennas with some that can be mounted outside the booth?
> What model/mfr? They're screw on 259 type connectors. The system must
> be rock solid under difficult circumstances, Pomotions manager in left
> field, for example.
Just moving the antennas out of the rack would be some improvement.
Moving them outside would be even more improvement. As others
have suggested, you can get better range from directional antennas
(like "Yagi"s which look like TV antennas). But they must be aimed
at the transmitter which may not work if it is wandering around?
In a recent discussion over on rec.arts.movies.production.sound,
it was mentioned that the antennas should be 4-5 wavelengths apart
from each other for minimal diversity receiver operation.
> 2) They want the PA to feed into a picnic area just beyond center/right
> field. I can add an amp in the booth and run 70v through conduit and
> mount them on light poles, but it's a difficult path, and the GM is
> balking at the expense. he wants a wireess system. I'm considering a
> transmitter in the booth and an all-in-one receiver/amp/speaker that
> they can move at will. What units would you recommend? It will
> basically bring announcements to an area about 75x50 feet.
Hard to believe that a *decent* wireless system would cost less than
running passive cable out there. Of course if they want to try something
cheap, you will have additional problems.
I would rent a DitchWitch vibratory plow and run the kind of direct-
burial cable they use for 110V power. No digging, no trench, no
conduit, etc. etc. If that cable is good enough for 1000W @ 110V,
it should do fine for 100W @ 70V. Note, however that there may
be local building codes to deal with?
> 3) The speakers at the adjacent conference center apparently crackle,
> even with no program material. But I was not able to hear it today, as
> there was a conference going on. I'm guessing the speakers are OK, but
> something is getting into the amp or cabling.
You will need to hear it failing to debug it. Crackling MAY be caused
by the speakers themselves, but you didn't mention what kind they are?
> For rec.video.production:
>
> 1) A Sony 3-chip DVCAM feeds through a vertically mounted antenna
> (about the size of a flashlight barrel, BNC connector) to a series of
> DynaPix antennas, into a receiver, then onto the big CF screen. The
> previous company removed 4 of the 5 antennas!
If there is only one transmission point (the camera) and only one
receiving point ("the big CF screen"), what were they doing with
"a series of antennas"? Something is missing from your narrative.
> The system never worked well, as I understand the antenna is
> designed to be AIMED at the DynaPix antennas, not vertical.
If you want specific advice on equipment, you will likely need
to provide specific model numbers, etc. Have you gone to their
website to see if you can download manuals/instructions, etc?
> Is there any more reliable system out there, that can receive
> solid pictures from most any open area of the stadium? THIS
> one, they're willing to spend a bit on.
You need to get the docs on you present system to see if it is
even being used properly before launching into something new.
Even consumer-level RF ("antenna") cable and spliters, etc
from Radio Shack will distribute a nice-looking video signal
around a large facility. Dunno why people think that "wireless"
is some magical solution to good & inexpensive transmission
of audio or video?
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