hissing mics

[fcnewcastle]

hello - I've got a pa system (Pulse Conference 100w) - works perfectly fine with mics which came with it - until I connect up a second mic which is connected via a double-antennaed receiver box (comes with two separate wireless mics). As soon as this connection is made there's a lot of background hissing which only goes when the second mic is switched off. One explanation I read was to do with unshielded cable? Does that make sense and would I be able to procure a shielded one to get rid of it?

Many thanks for any assistance with this

thanks

Francis

[Bobbsy]

Are you trying to run two radio microphones into a single receiver at the same time?

 

In any case, you would have had to work hard to buy a cable the ISN'T "shielded" (more commonly called "screened" outside the USA). It's far more likely a fault with a cheap radio mic (or having two transmitters powered up into a single receiver).

 

Try plugging a conventional mic into the input you were using for the radio. If other sources work in that input (using the same cable if you possibly can) then the fault is isolated to the radio mic.

 

Aside: There's a truism in professional audio..."You can spend thousands on a radio mic system that is almost--but not quite--as good as a £10 XLR cable.

[paulears]

Unshielded cable usually produces hum, not hiss.

 

I'm not absolutely certain what you are doing. You are plugging in a radio microphone receiver, and are getting a constant hiss? or a his that comes and goes.

 

I suspect you have a receiver that has a microphone level output, and have plugged it into an input that expects a much higher level (a line level, not mic level signal) Turning the gain up just generates lots of hiss - this, when connected wrongly like this is quite normal.

 

If you tell us exactly what this receiver is, what the socket type is, what it is labelled, and then the same again at the other end where it plugs into the other unit - what sort of socket and what is it labelled. Pics would help, but you have to host them on photobucket or similar and then link to them from this forum. Words will be fine - but we really need all the info. It could be as simple as being in the wrong 'hole'!

[Jivemaster]

Looking at someone's sales site for this Pulse combo I suspect that the combo has a radio receiver built in and you are trying to use a second wireless system, am I close? IF so then perhaps there is an RF conflict between the two radio systems, - this is a more likely source of mushy hissy noises (as above, unscreened cable usually puts mains hum back into the system).

[fcnewcastle]

hello again - thanks to you all for your very informed advice. I'll get some more accurate details together and post up

thanks

Francis

 

 

[laolu]

Looking at someone's sales site for this Pulse combo I suspect that the combo has a radio receiver built in and you are trying to use a second wireless system, am I close? IF so then perhaps there is an RF conflict between the two radio systems, - this is a more likely source of mushy hissy noises (as above, unscreened cable usually puts mains hum back into the system).

I'd say so, too. Two mics sending at the same frequency produce those artifacts, it sounds like you're talking from Mars.... B-)

Norbert