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are in a " locked out" type of circuit and after experiencing an
overload these overload relays must be reset before plate vol-
tage can again be applied.
Mechanically,
the FM-201Bhas been designed to be easily main-
tained.
Ready
a
ccessibility to all parts is accomplished by
lift off type doors.
The sides for both cabinets may be easily
removed by removing two screws from the holding bracket at the
bottom of the side panels and the side panels lifted off.
Thu use of drop down front panels in the amplifier and P.A.
power cabinet also increase the accessibility of componen
-
bs
mounted on the bottom of the cabinets from the front of the
transmitter.
Another feature is a swing- out panel in the P.A.
power cabinet.
By removing the end bell,
the swing- out panel is free to open.
In doing this, maLnitanqnco from the side is also possible.
The control panel located in the power cabinet is also hinged
and is free to drop down.
This completely exposes all metering
circuits,
overload relays,
and switches so that it is possible
to service frem the front.
The meter panel for both the driver and the power amplifier are
hinged and may be lifted up by first loosening the fastener one-
quarter turn using a screwdriver or coin,
and then lifting the
meter panel up.
This will give access to meter terminals and
wiring of the Reflectometer or Micro- match switching section.
The control circuit of the 20KW Amplifier is dependent on the
control circuitry of lkw driver.
If for any reason the 20KW
becomes inoperative, the driver can be connected to the trans-
mission line and operated independently of the 20KW Amplifier.
INSTALLATION
In advance of actual placement and adjustment of the transmitter,
certain preliminary planning should be done.
The use of the
floor plan drawing will assist in locating the power and audio
inputs and power output of the transmitter.
Power audio leads
for the transmitter may be brought in through a trench provided
under the transmitter if a concrete floor is used.
If this is
impossible a fr=iework of 2 x 4's or 4 x 4's may be made to set
tàe transmitter on.
Leads from a low reactance power sources of 240 volts,
50/60
cycles,
3
phase with a 60 KV A capacity,
also 230 volts,
50/60
cicle,
single phase grounded neutral with a 5KVA capacity,
and
115 volts,
50/60 cycles with a 500 watt capacity should be placed
underneath the proposed transmitter location or platform.
These wires should be in agreement with local electrical codes
and which would be practical to carry the current of the trans-
mitter.
6/22/61
-4-
FM- 20B
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