There maybe interferrance from a nearby walkie talkie or other transmitter. If you can take the equipment off site, try that as a test. Otherwise clean your battery contacts. If none of this helps then your receiver has low sensitivity or your the RF output of the microphone is low.
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A wireless mic receiver will only reliably work with one mic at a time. For that reason, you need to have 4 receivers in order to use 4 mics simultaneously. You could switch back and forth between mics by setting them to the same frequency and turning them on and off, but they will not work reliably if they're both on at the same time.
This could be due to interference from other devices.
You could try changing to a different frequency (there are 20 to choose from).
Also move the receiver away from any strong electro magnetic fields (hearing loop amplifiers, CD/DVD players, TVs) or large pieces of metal and in clear line of sight of the transmitter pack.
Set up the aerials so that they are at a similar angle as the aerial on the transmitter.
Only use xlr balanced cables with good quality screening to connect the receiver to the mixer / amplifier. Keep signal cables well away form mains electricity cables as far as possible.
Wherever possible use balanced xlr cables on all other equipment.
I had the same issue. The sound would fade and then go dead.. The preamp in the device I was using wasn't strong enough and also the phantom power seemed too low to sustain the microphone. After adding a TUBEPre by PreSonus, all of the issues went away and I was shocked to hear how good this microphone really is. Was the issue low phantom voltage/? or a lousy preamp? All I know is , after adding a preamp all of the problems went away.This has to be the best microphone I have tried in this price range.
It has been my experience that the wires going into the amplifier assembly is broken. What I do is cut the wire about 2 inched from the strain relief, remove the old wires from the amplifier and reterminate the amplifier. This fixes 90% of my problems. The other 10% is a broken wire at the microphone end of the cable. This cannot be fixed as the cabling has been injection molded.
As condenser microphones 'mature' they may accumulate contaminants on their diaphragms, which in turn provide a relatively low impedance bypass for the bias voltage. To check if your microphone may suffer from this effect, hold it close to your mouth and breathe (heavily) a few times on the head. The moisture from your breath will condense , and if there the capsule is compromised by contaminants, or if it has developed other flaws, you will hear an increase in frying sound and/or complete loss of output. Sometimes the capsule can be cleaned, thus extending its useful lifespan. At the risk of causing irreparable harm to the heart and soul of the microphone, this procedure should not be attempted by an inexperienced specialist! If in doubt, sens the microphone to the Neumann Service Department in Old Lyme, CT or another qualified specialist.