INPUT IMPEDANCE
MICS A, B & C 1200 ohms
TAPE >50k ohms

INPUT SENSITIVITY (With base station faders at line up i.e. holding 10dB)
MICROPHONES A, B & C
The microphone inputs are intelligent. Input sensitivity is -63dBu to -47dBu when used without phantom power and –51 to –34 when phantom power is selected. The gain is set by a microprocessor that will prevent the input hitting the limiter too often but will keep the gain high enough for quiet commentators.
This circuit takes into account the background noise and will not alter the gain when the commentator stops speaking. The gain will also not be changed when measuring with tone but will remain at the gain previously set when used with speech.
TAPE C INPUT
A pad is inserted before the mic C input so that the intelligent input stage will then line up with signal levels between -8dBu and +8dBu

PHANTOM POWER
+12 volts phantom power from a 2100 ohm source can be enabled by 3 front panel switches. One for each mic.

HEADROOM
A limiter follows the intelligent input stage and so the maximum input levels before clipping are, at minimum gain:-
Mic Inputs better than - 15 dBu
Tape Input better than +26 dBu

HEADPHONES
This equipment is designed to work with medium to high impedance headphones.
Max output is:- +18dBu into High Z
+16dBu into 300ohms
+12dBu into 100ohms

MIX OUTPUT (Rear Panel)
Level at line up -3dBu (depends on length of cable)
Impedance <65ohms transformer balanced

GUIDE 2 INPUT BREAK (Rear Panel)
Level 0dBu nominal
Impedance >50kohms electronically balanced

AUX B INPUT (Rear Panel)
Level -6dBu nominal
Impedance >50kohms electronically balanced

CONNECTORS
Microphone/Tape inputs XLR3 fixed sockets
Headphones Jack sockets that accepts A or B gauge jack plugs
Rear panel tape output XLR3 fixed plug
Rear panel Guide 2 break jack Bantem jack
Rear panel Aux B input Bantem jack

LINE UP
All faders in the GSOC26 hold 10 dB at line up.

FREQUENCY RESPONSE
Frequency response is measured from, the MIC I/Ps of the Commentators unit, to the PGM O/P of the Base Station.
Better than +1 / – 2dB from 40 Hz to 11kHz

NOISE
Noise is measured at the PGM O/P of the Base Station. Each base station fader set to line up in turn. Bandwidth is 20Hz to 20kHz. Measure with respect to output Line Up level. (normaly 0dBu). I/Ps are terminated in 300 ohms.
MICS at any gain ( 40 to 60dB) better than – 60dB unwtd quasi peak

DISTORTION
Total Harmonic Distortion is measured from, the MIC I/Ps of the GSOC24 to the PGM O/P of the Base Station.
I/P = - 60 to – 40dBu. Frequ = 300Hz to 3kHz. THD < 0.4%

CROSSTALK Co-ord out to PGM out
This is measured with mic A input at the GSOC24 set to produce a level of 0dBu at the programme output of the GSOC26 with the A fader at line up. The other faders are closed. The mic A input is then removed and it’s input terminated with 300 ohms. Tone is then fed to the co-ord input of the base station GSOC26 and it’s level set to produce 0dBu on the monitoring meter. Crosstalk is then measured at the programme output using a narrow band filter.
Crosstalk at 1kHz Less than –70dB
Crosstalk at 10kHz Less than –60 dB

NOTES
The GSOC24 is a new improved version of our GSOC4. It is entirely compatible with the original GSOC4 and can be used with any of our original base stations (GSOC3, GSOC5 or GSOC8) as well as with our new base stations type GSOC23 and GSOC26

LINE UP
All faders in the GSOC23 hold 10 dB at line up.

FREQUENCY RESPONSE
Frequency response is measured from, the MIC I/Ps of the Commentators unit, to the PGM O/P of the Base Station.
Better than +1 / – 2dB from 40 Hz to 11kHz

NOISE
Noise is measured at the PGM O/P of the Base Station. Each base station fader set to line up in turn. Bandwidth is 20Hz to 20kHz. Measure with respect to output Line Up level. (normaly 0dBu). I/Ps are terminated in 300 ohms.
MICS at any gain ( 40 to 60dB) better than – 60dB unwtd quasi peak

DISTORTION
Total Harmonic Distortion is measured from, the MIC I/Ps of the GSOC24 to the PGM O/P of the Base Station.
I/P = - 60 to – 40dBu. Frequ = 300Hz to 3kHz. THD < 0.4%

CROSSTALK Co-ord out to PGM out
This is measured with mic A input at the GSOC24 set to produce a level of 0dBu at the programme output of the GSOC23 with the A fader at line up. The other faders are closed. The mic A input is then removed and it’s input terminated with 300 ohms. Tone is then fed to the co-ord input of the base station GSOC23 and it’s level set to produce 0dBu on the monitoring meter. Crosstalk is then measured at the programme output using a narrow band filter.
Crosstalk at 1kHz Less than –70dB
Crosstalk at 10kHz Less than –60 dB