Posted by Scott Dorsey on 01/10/21 11:44

blackburst@aol.com <blackburst@aol.com> wrote:
>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. 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.

You HAVE to buy another Telex. You cannot mix and match different
manufacturers units because they all use different modulation and noise
reduction systems.

You can use any antennae intended for that band. Jerrold single-channel
TV yagis used to be a popular choice.

>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.

I think wireless is a mistake and gives you too many things to go wrong.
Running a 70V system will wind up costing less in the long run even
though the up-front cost is much higher. Is there ANY existing cabling
that you could piggyback off of? Telephone circuits, old unused power
wiring?

>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.

Almost certainly. Is there a wireless receiver connected to the thing
which is active but squelched down? If so, turn it off when it is not
in use.

>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! The system never worked
>well, as I understand the antenna is designed to be AIMED at the
>DynaPix antennas, not vertical. 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.

I don't understand this. Is this a single point-to-point link or is this
a broadcast link? If you have only a single point to point connection,
just use the right antennas and be done with it.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Back to original message]