NATO Plug wiring?

 
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PJS
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Since: Jul 17, 2003
Posts: 1



PostPosted: Fri Jul 18, 2003 6:06 am    Post subject: NATO Plug wiring?
Archived from groups: rec>arts>movies>production>sound (more info?)

I have been asked to wire an aviation NATO plug to XLR-3 and can't find a
diagram for it, can any one help?

BTW Any one experience any problems with a lav in the headphones split?

Cheers

Pat Slater
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Cleve Massey
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Since: Jun 25, 2003
Posts: 101



PostPosted: Fri Jul 18, 2003 6:06 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
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in article bf66h8$1gca$1@otis.netspace.net.au, PJS at
wrote on 7/17/03 8:06 AM:

> I have been asked to wire an aviation NATO plug to XLR-3 and can't find a
> diagram for it, can any one help?
>
> BTW Any one experience any problems with a lav in the headphones split?
>
> Cheers
>
> Pat Slater
>
>
Pat...what is it you need to do??? I have the wiring to tap into the system
and be able to have a line level feed into my mixer!!! If you hold the plug
with the tip up, take the second part of the plug and put to #2 on the
XLR...skip one and then take the fourth part to #1 with a jumper to #3!!!
If I can be any less clear...no connection to the tip or the third ring
down...

You mentioned the lav...if your talent needs to talk, then have them wear
one of the headsets provided in the aircraft and just tap into the system to
hear all sides of the conversations with the cable above...I have built a Y
so that I can tap in, and provide them with a NATO female so they don't lose
access to an intercom port and I still get everything!!!
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Scott Dorsey
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Since: Sep 02, 2003
Posts: 161



PostPosted: Fri Jul 18, 2003 6:06 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
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PJS wrote:
>I have been asked to wire an aviation NATO plug to XLR-3 and can't find a
>diagram for it, can any one help?

I think you mean an AM671 plug.

Tip Yellow Mic hi
Ring 1 Green Mic lo
Ring 2 Blue Ear lo
Sleeve Red Ear hi

As always, a 600:600 isolation transformer or a cheap DI box would be a
very good idea here, since the grounds will all be polluted with 400 Hz
trash floating everywhere.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Glen Trew
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Since: Jun 22, 2003
Posts: 91



PostPosted: Fri Jul 18, 2003 6:56 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
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If it's helpful, here is a ready-made one:
http://www.trewaudio.com/catalog/items/item214.htm .

Here's a tip: Have an in-line XLR pad ready. One of the Shure switchable
types should do the trick (again, if it helps:
http://www.trewaudio.com/catalog/items/item150.htm ). Some avaiation radio
intercoms will produce voltages too high even for normal line linput use.
Since you will be tapping off of the headphone feed, and that feed is
affected by the headphone that's plugged into it (military issue is usually
8 ohms, but sometimes higher impedence phones are used), and some pilots
like it louder than others, it is impossible to predict exactly what the
level will be. Do your own pre-flight: check for water in the fuel at the
low point, make sure the pitot tube is clear, and get a level check from the
radio-intercom. Then be ready to knock it down 25dB or so.

Good luck, and don't spin in.

Glen Trew


"PJS" wrote in message

> I have been asked to wire an aviation NATO plug to XLR-3 and can't find
a
> diagram for it, can any one help?
>
> BTW Any one experience any problems with a lav in the headphones split?
>
> Cheers
>
> Pat Slater
>
>
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Kurt Albershardt
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Since: Jun 22, 2003
Posts: 811



PostPosted: Fri Jul 18, 2003 5:20 pm    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Glen Trew wrote:
>
> Here's a tip: Have an in-line XLR pad ready. One of the Shure switchable
> types should do the trick (again, if it helps:
> http://www.trewaudio.com/catalog/items/item150.htm ). Some avaiation radio
> intercoms will produce voltages too high even for normal line linput use.
> Since you will be tapping off of the headphone feed, and that feed is
> affected by the headphone that's plugged into it (military issue is usually
> 8 ohms, but sometimes higher impedence phones are used), and some pilots
> like it louder than others, it is impossible to predict exactly what the
> level will be.


Sounds almost like an app for a speaker-level direct box.
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Dave Liquorice
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Since: May 20, 2004
Posts: 51



PostPosted: Sat Jul 19, 2003 5:20 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
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On Thu, 17 Jul 2003 23:06:40 +1000, PJS wrote:

> I have been asked to wire an aviation NATO plug to XLR-3

1) Define "NATO plug".

There are at least 3 types of connector used in aircraft intercoms.
Two of which look very similar but don't interconnect properly. Visit
http://www.headsetservices.co.uk/frame01.html and follow the FAQ link.

> BTW Any one experience any problems with a lav in the headphones
> split?

<snigger> "lav" is slang for "water closet" this side of the pond. Our
term is "personal" B-)

Not sure what you mean. One way of getting a feed from the intercom is
to bung a bit of foam around a personal to stop it rattling about and
place it in the gap between the earpieces of a spare headset suitably
gaffer taped together. This avoids all the nasty grounding problems
and possible litigation that could stem from connecting
non-approved-for-flying equipment to the aircrafts systems.

Using the intercom as a means of gathering good sound from a person in
an aircraft isn't really on, it is bandwidth limited and possibly
processed as well. If the person is wearing a headset it's far better
to neatly tape a personal to the comms boom arm. Needs a good
windshield and careful positioning to avoid P blasting but the
proximity to the mouth produces a sound pretty clean of aircraft noise
and of full range.

--
Cheers new5pam@howhill.com
Dave. pam is missing e-mail
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Thom Shafer
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Since: Jul 12, 2003
Posts: 6



PostPosted: Sun Jul 20, 2003 7:15 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
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Yes I have recorded sound in F-14 Tomcats, A6 Intruders and F-18 Hornets
with tremendous success using a very simple system.

Rigging a lav in the earpiece of the headset and isolating it with a piece
of torn up cotton t shirt. The trick is to ask the pilot to increase the
volume level slightly above normal listening level so that there is no
clipping in the vox system.

The problem with the aviation adapter is that there is not a standard wiring
scheme and there are several configurations depending on what you are doing.
Helicopters vs fighter's for example. Coupled with the problem of having an
extra jack in the aircraft you may want to consider this route.

If you are shooting on an aircraft carrier I would recommend that you take
along a nice roll of aluminum foil for the inevitable radar hits that you
will encounter.

Thom Shafer
http://www.televisionsound.com

"PJS" wrote in message

> I have been asked to wire an aviation NATO plug to XLR-3 and can't find
a
> diagram for it, can any one help?
>
> BTW Any one experience any problems with a lav in the headphones split?
>
> Cheers
>
> Pat Slater
>
>
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Scott Dorsey
External


Since: Sep 02, 2003
Posts: 161



PostPosted: Mon Jul 21, 2003 8:34 pm    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

arnaut wrote:
>
>As it turns out small planes do not use 400Hz electrical systems, so that's
>not a problem.

Many don't. The Cessna 172 has a 28VDC system, but you're also going to
get lots of noise hash from the engine magneto too. Even so, you'll find
it a lot quieter than a Huey, electrically.

>But can you elaborate a little more on the 600:600 transformer? What exactly
>does it do? And where do I get one of these?

It's a transformer. It allows you to isolate two audio lines so they don't
share a common ground, and it also provides some low-pass effect to eliminate
RF trash on the line. Any electronics supplier will have audio transformers
in the bin somewhere.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Eric Pierce
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Since: Jul 14, 2003
Posts: 8



PostPosted: Tue Jul 22, 2003 1:12 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Here's a nice little tutorial.

http://www.shure.com/support/technotes/app-transform.html

Eric


> But can you elaborate a little more on the 600:600 transformer? What
exactly
> does it do? And where do I get one of these?
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arnaut
External


Since: Jul 20, 2003
Posts: 8



PostPosted: Tue Jul 22, 2003 1:12 am    Post subject: Re: NATO Plug wiring? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Eric,

Thanks for that great link to the Shure tutorial. That really helps. I'll be
sure to pick up one of these pups.

Scott,

I think the late-model Cessnas (post-1997) are pretty good in terms of
shielding -- at least compared to the older Cessnas.

Regards,

Gordon.


"Eric Pierce" wrote in message

> Here's a nice little tutorial.
>
> http://www.shure.com/support/technotes/app-transform.html
>
> Eric
>
>
> > But can you elaborate a little more on the 600:600 transformer? What
> exactly
> > does it do? And where do I get one of these?
>
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