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Movies Forum Index » Movie Production (Sound) Forum » On set: Zaxcoms + Lectros + Senny G2s......
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| Boomboom... |
 Posted: Sun May 04, 2008 3:22 pm |
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By the end of the month, I'll be sneaking in a set with a new pair of
Zaxcoms. Brands used there: Sennheiser G2s and Lectros. In the manual
I downloaded from the net, I'm reading I could use the IP3 setting to
avoid intermodulation.
Any of you Zax. users have had the same experience before ? I
understand the scaling between the frequencies (mine) according to the
scale ( the offsets), but do I simply have to avoid using frequencies
that would be shared with other brands in my offsets scale and if
there is one , simply jump to the next offset in the scale and tune my
Tx/Rx with this number ?
For example:
-the choices being:
536-536.9-538.4-540.5
-a Lectro or G2 from other user is tuned at 538.4, I could tune my 2
Zaxcoms to :
536 & 536.9
or
536.9 & 540.5
or
536 & 540.5
.... simply avoiding the already used 538.4 ?
Sure, I'd be trying to get as far as possible from already used nearby
frequencies like "538.425" on a G2 ...
Any thoughts ? Am I over-stressed about all of this ? :o
PS: I don't have the mics so far; waiting for a few days, but trying
to sort things out in advance... |
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| Billy Sarokin... |
| Posted: Sun May 04, 2008 4:49 pm |
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There are 2 issues to deal with. One is frequency coordination.
There is no need to factor in intermod interference with the Zaxcoms,
but there is with the Sennheisers and Lectrosonics. Use Lectro and
Sennheiser frequency coordination charts to select freqs appropriate
for the Zaxcoms. Also, some mics (especially lower cost mics) are
susceptible to rf interference from the Zaxcoms if they are in very
close proximity to the transmitters, So if you are picking up
interference on any mics, move the transmittrers a few feet away.
Lastly, anytime a transmitter is very close to a receiver (as in a bag
rig where you have receivers for the actors mics and a tranmitter to
send audio to the recorder) it de-senses the receiver. In those cases
keep the transmitter freq as far from the receiver freqs as possible
and as far away physically as possible (ie, the receivers in the bag
and the transmitter in your back pocket).
Best,
Billy Sarokin |
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| Boomboom... |
| Posted: Mon May 05, 2008 3:10 pm |
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Yep, my CS3e too I guess... |
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| Billy Sarokin... |
| Posted: Mon May 05, 2008 7:07 pm |
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Surprised about the 416. All my Sennheisers (816, 40, 50 and 60) are
immune. Don't know about the Sanken CS3e. My COS-11's are slightly
susceptible (like if you wrap the transmitter antenna around the
Sanken cable) but I use them regularly with rarely a problem. My
Schoeps and Countrymen mics are also immune. I had a Neumann KMR82,
but got rid of it because it was susceptible.
Billy |
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| Boomboom... |
| Posted: Tue May 06, 2008 5:10 pm |
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God, I'm surprised now cause the last two times it happened in my case
it was the same scenario: a big transformer along the road and we,
shooting just below the power line on the street. Swapping my CS3e for
my KMR81 solved the problem each time... buzz disapeared
I'm actually trying to find a place to buy these XLR connectors from
Neutrik (XCC series) from a nearby dealer now to hopefully get rid of
the problem; when I find them, I'm going to make or modify cables for
both my wireless system, my boom and my cam. link.
For the "Y" cables that go from 5 pin to twice 3 pin, the tech at
Neutrik came with the idea of just swapping the sleeves of connectors,
keeping the internal part* (since it seems it's the actual sleeve that
got the mods for keeping the unwanted RF out). It's gonna ba a try...
and a story to follow ;)
*Only 3 pin XLR available in this connector series... |
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| Rob Lewis... |
| Posted: Wed May 07, 2008 2:51 am |
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On May 5, 8:32 am, Boomboom <compre55... at (no spam) hotmail.com> wrote:
Quote: Oh yeah, I forgot, I ordered the filter antennas so it might help a
little more.
Do you have an idea of how much more improvement we get from these
antennas ?
I know there's no miracles in this world but still asking...
The filtered antenna will clean up any bag problems, but it will
reduce your range a little as well? |
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