User Manual

RE3
UHF Wireless Troubleshooting and FAQ | en 57
Electro
-Voice Installation manual 2018-12 | 01 |
F.01U.362.808
venue you traveled to is different. Follow the scan process and select a new clear frequency. Then
turn on the transmitter and resync it to the receiver’s new data.
Q – Our RE3 systems have been working fine in the small venue we play. We decided to try
high power on the lead vocal mic transmitter, and now we’re having all kinds of problems.
What could be wrong?
A – In your small venue, high output power on any or all of your mics may be too much because of
transmitter-to-transmitter, and transmitter-to-receiver proximity. Too much RF gain can actually be
more destructive than low RF gain. High RF gain is most useful for long transmission distances,
but at short distances, it may contribute to intermodulation with nearby transmitters and receivers.
If the low power setting was working for you, switch back to it.
Q – I have a long distance between where I want my antennas mounted and where the
receivers will be located. Do I need antenna boosters and high-end coax?
A – This might be a very good idea. The purpose of using antenna boosters and/or active
antennas is to compensate for the signal loss incurred by the antenna-to-receiver coax cable run.
The system you describe will be improved with active RF antenna components and low-loss coax.
Coax cable performance is measured by loss factors, i.e., dB of loss per 100 meters. The goal is
to deliver to the receiver the approximate RF gain which is received at the antenna. The RE3
optional antenna coax cables should perform as per: 25-foot CXU25 will lose approximately 1.3 dB
on the run, the 50-foot CXU50 will lose approximately 1.4 dB on the run, the 75-foot CXU75 will
lose approximately 2.4 dB on the run, and the 100-foot CXU100 will lose approximately 4.4 dB on
the run. Factoring in the gains of the antennas, the passive log periodic PLPA is +10 dB, the active
log periodic ALPA is either +3 dB or +10 dB (selectable), and the active booster RFAMP is +10
dB. So for example, if your antenna cable run is 100 feet, and you deploy ALPA (set to +10 dB)
followed by CXU100 (-4.4 dB), the net RF gain at the receiver is approximately +5.6 dB, which is
fine. A handy way to think of it is booster/antenna gain minus cable loss equals net received RF
gain. We should also emphasize that an RF boosting device should precede the loss, not make up
for it after the loss (place a booster at the antenna location, and not the receiver location).
Q – I’m using an RE3 bodypack wireless for my bass guitar with active pickups and I’m
blasting the receiver hard. What could be wrong?
A – Your bodypack transmitter input pad should be engaged. Locate the -20 dB attenuator setting
in the menu and set it to ON. If further transmitter audio signal gain reduction is necessary, locate
the sensitivity setting in the menu and bring the sensitivity down a few dB as well.