Brian Reynolds
Forum Replies Created
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Bob you mention in your first post that you are “feeding mics directly into the camera” this can’t ever create an earth loop, what you have is induced hum and no transformer will ever fix that.Good cables, connections, and cable placement fixes the problem you experienced.
Earth loops are caused by interconnection with the earthing in the powering of the equiptment ie; mixing console to camera etc. if one or either piece of equiptment is running on batteries the possibility of a loop is broken.
The earth connection on equiptment is there for a reason YOUR SAFETY and must NEVER be broken. (If you try de-earthing for a test and what happens if its faulty….your toast!!! JUST DON’T DO IT) Equiptment with only 2 pins is double insulated to provide the safety factor.The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Hello Jim,
I have always worked on when using a 416 mic. (for training of assistants and camera operators) the talent must be at least be able to touch the tip of the mic or blimp windshield for sound suitable for broadcast. Any further away and you can possibly expect trouble.
With current trickery in protools etc. you might get a little further away, but its better to get good sound from the start as it will save a huge amount of time & money later in editing.
Another thing to think about is what is behind the talent waterfalls, fountains, flapping flags, machinery and crowds look good on camera but also generate a lot of noise that may give problems in an edit session.
I have always found that Sony ecm77 mics give good results for a middle of the road mic.
Hope this helps….The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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You will need some sort of reader to display what is recorded on the t/c track. Maybe a Pro. video machine or Pro. camera.
Or you may want to try this software download
https://www.autocaption.com/download_dynacaption.html
I don’t know much about the software but it’s worth a try.The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Hello Kaye,
Have a look at this link it may answer some of the problems you are having…https://www.locationsound.com/proaudio/ls/tips/techtips8_4.html
The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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I just downloaded the manual as well, it looks like ch1 or ch2 or mix of 1+2 on a 3pin xlr.
It looks like you will NOT get seperate tracks out.
You may need to borrow or hire a machine to do the transfer.The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Just check that the audio out XLR connector on the back of the camera.. is it a 5 pin or 3 pin?
I think you will find you have a 3 pin female audio in, 4 pin DC power in and 5 pin audio out
You will be able to switch between tracks 1/2 and 3/4
I have used a similar camera but a slightly different model and that has a 5 pin out.
If it is 5 pin the connections are
Pin 1 Earth
Pin 2 L+
Pin 3 L-
Pin 4 R+
Pin 5 R-The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Hi John, ground loops happen between pieces of gear and never between the mic and mixer, so the signals you are dealing with most times are at line level.
If you remove the connection to pin 1 in the connector the chances that some day you will need that cable for a phantom powered mic and the cable wont work.
Thats why i like a very short (100mm) XLR-XLR pin 1 lift cable in my kit… easy to insert in a line and easy to remove… problem solvedThe difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Analogue audio signals are infact a varying ac voltage from just under 1 volt (line level) to almost nothing at (microphone level).
If when 2 or more pieces of equipment are connected together and running on 110-240v they will have an earth connection which is there for safety reasons and must not be removed this may not be connected to the same point in the main switch board, but this is fine for safety.
When the audio cables are connected to the equipment another earthing connection is created directly between the units and will often be a shorter distance than the “electricial earth connection” this gives a very slight volt difference between the gear and often shows up as hum.
If that earth loop is broken by removing the connection on pin 1 the hum then stops.
If an isolation transformer is used it is infact breaking the physical connection of pins 2&3, from the input of the transformer to the output, and if then you disconect pin 1 the units will be TOTALLY audio isolated from each other.
This often refered to as a “Floating” signal (NAGRA audio gear often use this)I hope this explains a tricky subject to get your head around…
The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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Yes your right the XLR-XLR has no connection on pin 1,in one of the connectors.
The transformer I use is a 600 ohm – 600 ohm that is often found in electronics stores for telco isolation.
I tend to make most of my adaptors, some makers use switches for earth lifting.The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…
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I always work on the assumption that on EVERY job with different powering points you will give trouble.
But NEVER, NEVER, NEVER, NEVER remove the earth on the powering side.
Have a go at this.
1. make your power feed from the same point as the rest of the AV equiptment.And run ALL of your gear from this common power.
2.Get yourself an XLR-XLR cable about 100mmm long with only pins 2 & 3 connected between the connectors.(2 needed for stereo)
3.Get a small audio transformer 1:1 ratio in a box and insert it in the line for isolation.(2 needed for stereo)
4.Make sure that any audio cables are away from power cords.I have never known of a hum problem that cant be fixed with one or all of these steps.
The difference between Knowledge and Wisdom is… Knowledge is the knowing of facts…. Wisdom is the sensible application of good quality knowledge…