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INTRODUCTION
The PPB20 is a special kind of audio splitter in that it splits one incoming signal up to twenty outputs (as opposed to the usual
three). This splitter is especially intended for press conferences, in which a speaker addresses a number of journalists. Instead of
each journalist having to place his or her own microphone in front of the speaker, the PPB20 splits up the signal of one microphone
up to twenty outputs.
FUNCTION
Apart from a microphone input the Palmer Press Patch Box also offers a line input. This feature allows you to mix numerous mi-
crophone signals together on a separate mixer and then send the mixers' line output to the PPB20. You can select the input via a
switch on the front. Both input sockets can be found on the front and on the rear of the device. The inputs are transformer balanced.
The maximal amplifi cation is 76dB for the microphone input and 56dB for the line input. To optimise the dynamic response and the
signal to noise ratio the input gain can be adjusted in two steps by the use of a 30dB boost button.
The LED meter helps monitor the input level. The meter covers a large dynamic range from -40dB to +10dB. You can also monitor
the input signal using the integrated headphone amplifi er.
All of the 20 Outputs of the PPB20 are transformer balanced. The nominal output level is +4dBu at a nominal impedance of
300Ohms. Additionally, Channels 19 and 20 have TRS jack sockets for balanced/unbalanced signals and also cinch sockets (-10
dBu nominal level).
To avoid interferences between the individual channels, ten low ohmic driver circuits are used to drive ten Transformers, each of
which split up the input signal to two outputs. All outputs are thus galvanically isolated and the possibility of ground loop hum is
eliminated. The output pairs coming from each transformer are decoupled from each other by the use of resistors. In case of a short
circuit on the output, only one other channel will be affected in that it is dampened by 3dB. All the other channels remain completely
unaffected.
Each output has its' individual ground lift switch on the rear of the device.
Where more than 20 outputs are required, additional PPB 20s can be series-connected via a rear BUS IN/OUT socket.
POWER SUPPLY
The PPB20 is powered by an internal 230 Volt power supply. Power connector, fuse compartment and power switch can be found
on the rear of the device. In addition, you will fi nd a 4-pole XLR/M socket for a bipolar DC power supply (+/- 12V). Since both volt-
ages can be applied simultaneously, the additional DC voltage can be used as an emergency power supply in case of a power cut.
Please contact us, should you have further Questions concerning such emergency power supplies.
SPECIFICATIONS
Inputs:
- XLR/F, one transformer balanced input each for microphone and line levels,
- input select switch
- ground lift switch.
- Impedance for both inputs: 2000Ohms
- Max. input level: Mic: 0dB, Line: +20dB
- Max amplifi cation to output: Mic: +76dB, Line: +56dB
Outputs:
- 20 XLR/M, transformer balanced with ground lift switch
- Nominal output level: +4dBu (LED Meter shows 0dB)
- Maximal output level: +20dBu
- Nominal output impedance: 300Ohms
- 2x Stereo jack inputs balanced/unbalanced, nominal level -10dBu
- 2x Cinch inputs unbalanced isolated/ground-free, Nominal Level -10dBu
- Headphone output: Stereo Jack, Tip and Ring switched to mono. Suitable for headphones with an Impedance of 8Ohms to
200Ohms. Adjustable level
- LED Meter: 10 Segment meter ranging from -40dB to +10dB
- Bus in and out via mono jack
- Power supply: Integrated 230V (others available on request) or +/-12V
Dimensions:
- 19" Housing, 3 units high, approx. 200mm deep
PALMER - PPB20: Users' Manual
COMPONENTS
07
01
10
11
18 19
Page 4
PALMER - PPB20: Users' Manual
02
03
04
08
09
12
13
14
16
17
01) Microphone input
02) Line input
03) 20 x Line outputs
04) Jack and RCA outputs for channels 19 and 20
05) Headphones jack
06) Headphones Level
07) Protective cap for input level
(see points 16 to 19 for details)
08) Power switch
09) Connects electronic ground to chassis ground
10) Fuse and mains connector
11) Star ground connector
12) DC in
13) Individual ground lifts
14) Bus connections for linking numerous PPBs
15) Microphone and Line Inputs including ground lift
(same connections as on the front)
16) Meter
17) Input gain
18) Input select mic/line
19) 30dB boost
06
05
15
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