FWIW I had RFI breaking in from taxi cabs on my phono connection from
a record deck (preamp input 100 microvolts - 100 Ohm/22 nF) and now
use similar ferrite ring add-ons as Richard suggests to all the
interconnects in my hi-fi just. It seems to work well, at least in the
RF ranges used by taxis.
Steve
On 18 Apr 2011, at 12:15, Richard Lee wrote:
RFI protection is a complex & little understood subject. "Pro" mikes
differ hugely in their susceptibility. There are famous mikes from
famous names which are terrible. The preamp input also needs to be
RFI proofed.
Though I lust after a SD 788, Jim Brown says its input socket shells
may not be connected to chassis. ".. I've seen it in connectors
built into very good quality preamps and mics from a variety of
manufacturers. So far the list includes Audio-Technica, Mackie,
Neumann, Sound Devices and Tascam." Probably worth contacting Sound
Devices if you own one as I'm sure they will have a cure or retrofit
if they know of the problem.
Pin_1_Revisited_Part_2.pdf from Syn-Aud-Con
A long unbalanced cable is just asking for trouble. Len explicitly
recommends AGAINST using the extension in bad RFI areas.
A (possible) cheap cure worth trying on unbalanced lines is the clip
on Ferrite sleeves often found on computer cables.
http://jaycar.com.au/productView.asp?ID=LF1294&keywords=LF-1294&form=KEYWORD
Even better if you can take a turn round the Ferrite. You need them
at both ends as close to the connector as possible.
Do let us know what you tried even if it doesn't work. Is it AM
radio you are getting?
PS The Pin 1 problem is RFI getting in on the shields.
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