When I started recording in the 1970's I faced the same type of
sheilding problems. The multi-pin connector supplied by Nagra had one
wire crossed to bare wire causing a short and the microphone started
acting as an antennae and I picked up a radio frequency from a nearby
Radio tower. My sound engineer quickly spotted and corrected the
problem. Correct sheilding is vital.
-----Original Message-----
From: smokiesbirdsongs
Sent: Thursday, September 12, 2002 7:55 AM
To:
Subject: [Nature Recordists] New to the group and radio interference
Hello recordists
This is my first posting although I have been lurking in the
background for the last year. I record birds primarily in the
mountains of east Tennessee and western North Carolina. Something
really interesting that I started this past spring and I am
continuing this fall is recording flight calls of nocturnal migrants
(I found out how to do this thanks to this group). Recording with
the flower pot microphone worked perfectly at my home in Knoxville
but I got the opportunity to record at 5000 ft. in the mountains away
from insects and road traffic. I hooked up my equipment and started
getting perfect recordings of audio from radio/tv in addition to a
loud hum over top of the flight calls. I tried grounding the
microphone and got rid of a lot of the hum but got even better audio
reception. My local audio supplier looked at my microphone cable and
said it had a shield but the wire was not shielded and that could be
a source of my problem but there could also be other places that are
not shielded and RF is leaking in. Does anyone have any ideas?
Where I am recording is 1.5 hours from home so I need to take several
options with me to fix the problem. I ordered shielded microphone
cable but should I wrap the flowerpot with the microphone with
Aluminum foil or are there other options. Thanks for any ideas.
Also, thanks to every one. I have learned a lot from the postings and
the great web sites that people have. Mark.
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