GENERAL TECHNICAL DESCRIPTION
The FM-AV4 Portable Wireless Sound System consists of an FM875 combination wireless
receiver/amplifier/speaker with a rechargeable battery pack, an M175 belt-pack transmitter and a
microphone. Optional microphones, transmitters and accessories are available. These items will be
discussed elsewhere in this manual.
The FM-AV4 features a VHF high band wireless microphone system with excellent operating range,
freedom from "dropouts" and interference from other radio transmissions. The built-in receiver provides
high selectivity and sensitivity with an automatic squelch circuit which requires no adjustment by the user.
The M175 belt-pack transmitter uses the microphone cord as the antenna which eliminates the dangling
wire antenna found on many other transmitters. The transmitter features a gain adjustment to properly
match the level of your voice and the microphone.
The FM875 receiver/amplifier offers inputs and outputs to accommodate virtually any application. In
addition to the wireless, there is an auxiliary microphone input for dynamic microphones, a balanced,
microphone level audio output, and both "aux in" and "line out" jacks for external tape recorders. This
allows the FM-AV4 to interface with other sound systems, video taping equipment or any type of "house"
sound system. This versatility lets you use the wireless microphone, a hard-wired microphone, a tape
recorder and the house sound system all at the same time.
The FM875 is powered by built-in rechargeable batteries and will easily operate for over 12 hours after an
overnight charge. The sound output will cover an audience of several hundred people.
RECHARGEABLE BATTERIES
It is very important to recharge the battery pack immediately after the unit is used. The battery pack is
charged by plugging the CH-40 charger into the jack labeled CHARGE on the control panel of the unit.
Connect the charger into a standard 110 Volt, 60Hz AC outlet. The green lamp beneath the jack will light
as long as the batteries are charging. When the batteries are almost completely charged the green charg
ing light will go out. You may leave the charger plugged in after the green light has gone out with no
danger of damage to the system. In fact, we recommend charging the system whenever it is not in use,
then the system will always be "ready to go".
Operation is possible while charging the batteries with the supplied CH-40 charger, however since the
amplifier consumes more power than the CH-40 charger can supply, the batteries will recharge faster if you
turn the amplifier power off while charging.
The battery pack should be recharged for 16 hours at least once every six months even when the unit is
in storage and not being used.
In many cases, a battery that seems to be dead may be saved by prolonged charging. As much as 10
days of continuous charging may be necessary to restore the batteries after they have been left for several
weeks or more in a "discharged" condition. The charge lamp may not light up during the first part of a
prolonged charging period.
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