Hi Jascha, Umashankar and John,
A couple of thoughts on RFI in general:
1. The interference can enter any port, even outputs, and get
demodulated once inside, sometimes appearing as if on the input.
Classic cases are un-/poorly- shielded headphone leads, power leads etc.
2. You can get resonant antennas due to the particular length of a
cable. If one particular radio source is problematic, try different
lead lengths, if available, to change the tuned frequency.
Good luck!
Neil A
At 09:00 AM 4/17/2011, Jascha Narveson wrote:
Hi, John and Umashankar -
Interesting... My radio's definitely on the recording, not the
monitoring. I did notice after posting my last email that the
extension cable that comes with the TetraMic is a Mogami shielded
cable - it's still quite thin though, the Times Square is a RF-heavy
environment.
Has anyone had any experience with these?
http://store.shure.com/store/shure/en_US/pd/productID.104211000
I'll also try and skip the extension cable and go straight from the
break-out cable to the PPAs, though that'll be a little awkward to set up...
Thanks again!
cheers,
j
On Apr 16, 2011, at 8:25 PM, umashankar mantravadi wrote:
>
> if the radio pick up is happening at the mic head (possible)
what you will need is a metal grill which is earthed. the signal is
unbalanced till the ppa outputs. so it is best to use any extension
cables after the point.
>
> umashankar
>
> i have published my poems. read (or buy) at
http://stores.lulu.com/umashankar
>
>
>
>> Date: Sat, 16 Apr 2011 14:56:34 -0700
>> From: [email protected]
>> To: [email protected]
>> Subject: Re: [Sursound] rf interference
>>
>> I have the radio pick up problem with my Tetramic.
>> I find it is better to put the 4 XLR adaptors into my 4x3ft XLR
cables and then plug the
>> XLR cables into my MOTU Traveller rather than use one of Lens
extension cables and plug
>> the adaptors directly into the Traveller.
>> If I need distance I use a couple of InstaSnakes and shielded CAT5.
>> Radio pickup is still a problem in some locations though.
>> I tried wrapping multiple layers of heavy kitchen aluminium foil
over the adapters after
>> zip-tying them to the handle of my Rycote blimp.
>> Worked OK in the kitchen, but nowhere else. :o)
>>
>> Bill
>>
>> On 16/04/2011 12:36 p.m., Jascha Narveson wrote:
>>>
>>> Hello, once again, surround list -
>>>
>>> My apologies for the continued emails from my end - as you can
tell, I'm trying to muddle through some location recording this
weekend, and am running in to things I've never dealt with before. To whit:
>>>
>>> I've just come back from recording in Times Square and
discovered that I was picking up the radio. I'm using a TetraMic,
and I'm guessing that the 6' extension cable that goes from the mic
to the break-out cable might be the weak link, as it looks rather
thin and is probably unshielded. From the PPAs I have four 3-foot
XLR cables that are then going in to the 788T, so they might be
part of the problem, as well.
>>>
>>> I know that in picking Times Square as a recording subject I'm
walking in to one of the heavier RF zones in the city, but I'm
hoping that somebody here might have some tips of things I can try
to work around it...? Is there some way I can shield the cables in
a d.i.y. fashion, for instance?
>>>
>>> thanks yet again,
>>>
>>> - jascha
>>>
>>>
>>>
>>> _______________________________________________
>>> Sursound mailing list
>>> [email protected]
>>> https://mail.music.vt.edu/mailman/listinfo/sursound
>>>
>>>
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