POWER SUPPLY
Input connector IEC fixed plug
Operating voltage 110 to 240 volts AC without tap changing
Operating frequency 47-63 Hz

ALL OUTPUTS
Output Impedance 50-60 ohms electronically balanced
Normal load impedance High impedance
Minimum load impedance 600 ohms
Maximum output before clipping > +12dBu

ALL INPUTS
Input impedance > 50k ohms electronically balanced
Acceptable input levels -18dBu to +10dBu

TECHNICIANS HEADPHONES
Impedance each ear 100 ohm to high Z
Connector Jack socket that accepts A or B gauge jacks

PROGRAMME AND CO-ORD LINE IDENT RECORDERS
Total message time 16seconds. Any unused time will be filled with 1KHz tone.
Level at output 0dBu programme (+8 peaks) with 0dBu line up tone

CALL HOME SIGNALLING ON CO-ORD CIRCUIT
An opto isolated loop closes for 5 seconds

HOME CALLS SIGNALLING ON CO-ORD CIRCUIT
On receipt of an earth loop box and base station are signalled

LINE UP
All levels to the commentators box are correct when preset using the LED column meter.

NOISE
Noise is measured into high impedance at the MIX output of the GSOC24 with a CCIR Quasi-peak meter. All faders are closed and no signals are sent to the GSOC24.
< -58 dB CCIR unwtd quasi-peak

FREQUENCY RESPONSE
Frequency response is measured from the international sound input of the GSOC26 to the mix output of the GSOC24. The international sound rotary fader is set to 12 o’clock and the international sound input level adjuster is set to line up using the LED meter.
Better than +/- 2dB from 60 Hz to 11kHz

DISTORTION
Total harmonic distortion is measured from the GSOC26 international sound input to the GSOC24 mix output. Levels should be set as for frequency response measurement.
Any frequency 300Hz to 3kHz THD < 0.5 %

CROSSTALK
Co-ord to Mix output. Tone is fed to the co-ord input on the GSOC26 and it’s level set to ‘PPM4’ on the LED meter. Crosstalk is then measured at the mix output of the GSOC24 using a narrow band filter.
Crosstalk at 1kHz < -60dB
Crosstalk at 10kHz < -45dB