FP23 Portable Battery Powered Microphone Preamplifier

NOTE:  The FP23 has been discontinued.  For further assistance, please contact our Applications Engineering department.

(Discontinued) Tough, studio-quality preamplifier for critical on-location recording.

The FP23 preamplifier is a compact and rugged tool for use in today's high definition broadcast world. Featuring resilient mechanical and electrical construction from high quality components, the FP23 is ideal for use in any critical location or broadcast environment. Applications include radio, television, and film, as well as sports programming and other production capacities. The FP23 is extremely durable, easy to use, and exceptionally quiet. The versatility of battery power and the availability of phantom power make the FP23 a necessity for any broadcast professional.

• Phantom Power: Selectable 12v or 48v power for condenser microphones
• Selectable low frequency roll-off attenuates unwanted ambient noise
• High immunity to RF Interference due to transformer isolation, RF filtering, and an all- metal chassis
• Battery Operation: 2 AA alkaline batteries provide over 24 hours of operation (phantom power off)
• LED Low Battery Indicator: Activates when four hours of operation remain
• Innovative battery compartment provides improved weather resistance and easier access for faster battery replacement
• Extended Range Peak Limiter: Incorporates dual opto-isolators that make the unit virtually "clip-proof."
• Up to 66 dB of gain, adjustable in eleven discrete steps for accurate, repeatable gain settings
• Premium quality input and output transformers that provide superior sonic quality and freedom from interference

Gain

0 dB to 66 dB input to output, switch selectable

Gain Accuracy

+0.6, ­0.1 dB with reference to front panel gain markings (150 ohms source, 100 kilohms load impedances)

Frequency Response

          20 Hz ­ 22 kHz, +0.1, ­0.5 dB

­          1 dB at 50 kHz (relative to 1 kHz level with 150 ohms source)

 

Equivalent Input Noise

­126 dBu (­128 dBV) maximum

(150 ohms source, flat weighting, 22 Hz ­ 22 kHz bandwidth for gain settings of 36 dB or greater)

 

Output Clipping Level

+22 dBu minimum with 100 kilohm load +20 dBu minimum with 600 ohm load

Input Clipping Level

+4 dBu minimum at the 0 or +18 dB gain setting

Dynamic Range

122 dB minimum at the +18 dB gain setting

THD + Noise

0.05% maximum

(from 50 Hz to 22 kHz @ +4 dBu output level, 22 Hz ­ 22 kHz filter bandwidth, +46 dB gain setting)

 

Common Mode Rejection Ratio:

100 dB minimum at 80 Hz

60 dB minimum at 10 kHz

Input

Transformer-balanced, 2000 ohm input impedance

Output

Transformer-balanced, 130 ohm output impedance

Low Cut

80 Hz or 160 Hz (switch selectable), 6 dB per octave

Phantom Power

12V or 48V (switch selectable) per DIN 45 596

Limiter

Limits to +17 dBu output level

10:1 limiting ratio

5 ms attack time, 100 ms release time

Amber/Red LED indicates limiting/clipping

 

Internal Voltage Rails

+15 V and ­15 V, regulated

Power

2 AA batteries, 24 hours life typical with +4 dBu signal into 600 ohms, no phantom power

Power LED

Green indicates power and good battery.

Red indicates power and low battery.

LED turns red when approximately 4 hours of battery life remain.

Polarity

Mic input to line output is non-inverting

Operating Temperature Range

­18 to 57 degrees C (0 to 135 degrees F)

Dimensions

43 mm x 94 mm x 140 mm (H x W x D) (1.7" x 3.7" x 5.5")

Weight (unit only)

0.56 kg
1.24 lbs.

Weight (packaged)

0.86 kg
1.90 lbs.

• FAQ's on FP23