Compressor Off-On Slide Switch: disables the compressor Connections
and gated memory functions, converting the FP51 to a stan- Connect the signal sources the to three-pin XLR lnput con-
dard microphone mixer. nectors. Connect the three-pin XLR Output connector andlor
Tone Osc Off-On Slide Switch: provides a highly stable, low- Line Out terminals to the input of a power amplifier, mixer,
telephone line, etc. Set the Output MiclLine switch for the
distortion 1 kHz tone for line tests and level checks. The tone appropriate signal level.
signal level is controlled by the Master Level control. The tone
signal appears on both the lipe and microphone outputs, as Refer to the Operating Hints section titled, Additional In-
well as the Headphones and Mix Bus connectors. The tone puts, for information increasing on the number of available
oscillator should be switched off when not in use. microphone- or line-level inputs.
Connect headphones to the phone jack or 3.5 mm mini
Headphones 1M-inch Phone Jack and Miniature 3.5 mm Phone phone jack, if desired, for monitoring the FP51 output.
Jack: permit monitoring mixer output through most stereo
headphones. The Headphones rotary control adjusts the out- Connect the line cord to a 120 Vac 2 lo%, 50160 Hz source if
the FP51 is to be ac-operated. If 240-volt ac operation is
put level of both jacks. Note that the headphones output level desired, refer to the Service section.
is high enough for use as an auxiliary unbalanced line feed to
drive a tape deck or a power amplifier. Adjustments
Turn the Compressor and Gated Memory slide switches on,
lnput 1-4 XLR Connectors: are transformer-balanced, profes- the VUlComp switch to Comp, and the VU Range switch to + 4
sional three-pin audio inputs. Pins 2 and 3 are "hot" and or +8 dBm. Rotate the Channel Level and Master Level con-
"neutral," and pin 1 is ground. For microphone operation, the trols fully counterclockwise to 0, and set the Response Rate
lnput MiclLine switches must be in the Mic position; line for
level inputs, the switches must be in the Line position. control for the program material to be used.
If desired, turn on the Lo Cut Filter switches above the Chan-
Phantom Off-On Slide Switch: controls the application of nel Level controls. The filter action will help reduce wind noise
phantom power for condenser microphones to all inputs. With and undesirable low-frequency signals (see Figure 2).
the switch on and lnput MiclLine switches in the Mic position,
+30 Vdc is applied to pins 2 and 3 of each input connector
(power is automatically removed in the Line position). Series
current-limiting resistance is 3.3 kilohms for each input. When
using other than Shure microphones, verify that the voltage
and resistance requirements are compatible.
Output XLR Connector: is a professional three-pin audio con-
nector for connection to either low-impedance microphone or
line-level inputs of power amplifiers, mixers, or other signal-
processing equipment. The Output MiclLine switch selects
either microphone- or line-level output signals.
Line Out Push Terminals: provide direct wire connection to a
balanced 600-ohm line. Terminals are in parallel with the 3-pin
Output connector when the Output MiclLine switch is in the
Line position only. The red terminal in is parallel with pin 2 of
the Output connector, and the black terminal is in parallel with FREQUENCY IN HERTZ
pin 3. Note that the line-level output signal is always present
on these terminals. LO CUT FILTER ACTION
Mix Bus Phono Pin Jack: provides direct access to the out- FIGURE 2
put channel mixing bus. This facilitates stacking or "multing"
FP5ls to achieve additional input capacity losing without any Note that each input Channel Level control has a cuing
inputs. With two FP5ls connected at their Mix Bus jacks, for capability. To cue a channel while the other channels are
example, the mix buses of each unit are directly connected, carrying program material, pull the desired Channel Level con-
providing two independent Master gain controls and two trol outward to the cue position. This removes that channel
isolated line amplifiers with eight individually control\ed in- from the mixing circuitry routes and it only to the Headphones
puts. Since the buses are directly connected, a dB 6 drop in the jacks. Adjust the Headphones level control to a comfortable
gain of each output channel will occur, and the Master or In- listening level, and adjust cued the Channel Level control for a
put controls must be increased to compensate. Noise proper mixing level. Restore the cued signal to the program
specifications are not adversely affected by this connection. mix by pushing the Channel Level control inward.
Turn on the Power switch and allow approximately minute 1
warmup time. The VU meter will light in ac operation. Turn the
INSTALLATION AND OPERATION Phantom switch on if non-battery-operated condenser
Battery Operation microphones are to be used with the FP51. (Caution: Do not
In addition to 120- or 240-volt ac operation, the FP51 can be turn the Phantom switch on when using unbalanced low im-
operated from an internal battery pack. Current drain is pedance microphones.) Note that phantom power cannot be
typically 30 mA at +4 dBm output level. Battery operation is applied to the inputs with the MiclLine switches the in Line
recommended for remote, on-location operation, and as an position; if line-level condenser microphones (such as Shure's
emergency backup source in case of ac power failure. SM82) are to be operated on phantom power, contact Shure's
Access to the battery compartment is through the bottom of Service department for modification instructions.
the chassis. Three 9-volt transistor radio batteries power the Turn on the Tone Osc switch. dB A compression reading of
FP51 at full rated out~ut. Duracell MN1604 or Evereadv 522 approximately 10 on the VU meter lower scale will result, and
batteries are recommended. Battery life is approximat~ly 10 the Gated MemorylPeak LED will turn off.
hours at +4 dBm continuous use. Note that ~hantom Dower Set the VUlComp switch to VU and rotate the Master control
loading will increase battery drain. for 0 a VU meter reading (upper scale). The tone signal be can
With batteries in the battery compartment, the FP51 will heard in headphones connected to either phone jack. The tone
automatically and silently switch to battery operation should signal can be used to calibrate equipment following the FP51.
the ac voltage fall below a suitable level. Reduce the Master control setting for a -2 VU meter
Battery condition can be determined using the Batt Check reading, and turn off the Tone Osc switch. The Gated
switch on the front panel. With the FP51 Power switch on, ac- MemorylPeak LED will turn on, indicating that the gated
tivate the Batt Check switch and observe the VU meter. A new memory is "holding" the prior amount of compression. Note
set of batteries will give about a +2 VU indication. Battery the Master control setting for future use. (Note: This output
condition is good if the reading is above 0 VU; a lower reading reduction made is to compensate for the moderate short-term
means that new batteries are required for proper operation. output dynamic range encountered for speech using the |
ACEC
