Glensound GSOC24 Product information

GLENSOUND ELECTRONICS LTD

G GLENSOUND ELECTRONICS LTD. Tel: +44 (0) 1622 753020

6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND +44 (0) 1622 753662

Fax: +44 (0) 1622 762330

GSOC24 & GSOC26 1U COAXIAL COMMS HANDBOOK CONTENTS Page 1 of 2

DATE 12/02/01 MW06-246 ISSUE No. 5

DESCRIPTION DRAWING No

GENERAL (Pink Sheets)

1. Commentators Equipment Warning Notes PT14-02

2. Co-Axial Commentators Equipment Information WP14-81

3. GSOC24 & GSOC26 Block Diagram A2-13900

4. Level Diagram A3-13853

5. Waveform on Co-Ax Line A3-14358

GSOC24 (Blue Sheets)

6. Information WP14-83

7. GSOC24 Views A2-13462

8. Block Diagram A4-13859

9. GSN36 Circuit Diagram A2-13854

10. GSN36 Logic Circuit Diagram A3-13855

11. GSN37 Mic Amp Circuit Diagram A2-13848

12. GSOC24 Gain Software Notes AP24-51

13. GSOC24 Automatic Gain Options A4-13849

14. GSN38 Line Interface & PSU Circuit Diagram A3-14676

15. GSN38 Receive & Send Amp Circuit Diagram A2-13857

16. GSN39 I/P Filter Circuit Diagram A3-13852

17. 25 Pin ‘D’ Connector Pin Outs A3-13850

18. IDC Leads Diagram A3-14384

19. IDC Conn 1 Lead GSN36 – GSN38 WP14-93

20. IDC Conn 2 Lead GSN36 – GSN37 WP14-94

GSOC26 (White Sheets)

21. Information WP14-86

22. GSOC26 Front & Rear Views A2-13726

23. Block Diagram A3-13725

24. GSN80 Mix & Monitoring Circuit Diagram A2-13920

25. GSN81 Monitoring Circuit Diagram A2-13922

26. GSN82 Rear Motherboard Circuit Diagram A3-13924

27. GSN83 Balance I/P Amp Circuit Diagram A4-13927

28. GSN84 Daughter Board Circuit Diagram A3-13928

29. GSN85 Line Send Output Daughter Board Circuit Diagram A4-13931

30. GSN87 Ident Daughter Board Circuit Diagram A3-13932

31. GSN88 TB Amp Circuit Diagram A4-13934

32. GSN89 LEDs Circuit Diagram A3-13936

33. GSN90 TB Switching Daughter Board Circuit Diagram A3-13938

34. GSN91 TX Circuit Diagram A3-13940

35. GSN92 RX Circuit Diagram A3-13942

36. GSN93 Master Timing Circuit Diagram A3-13944

37. Power Arrangements A4-14386

38. Interconnecting Subrack Monitoring WP14-84

39. On Air Logic Truth Table WP14-85

40. GSOC26 IDC Leads Diagram A3-14382

41. IDC Conn 6 Wiring Information WP14-87

42. IDC Conn 8 Wiring Information WP14-88

43. IDC Conn 9 Wiring Information WP14-89

44. IDC Conn 13 Wiring Information WP14-90

45. IDC Conn 14 Wiring Information WP14-91

46. IDC Conn 15 Wiring Information WP14-92

47. Wiring Information WP40-131

GLENSOUND ELECTRONICS LTD

G GLENSOUND ELECTRONICS LTD. Tel: +44 (0) 1622 753020

6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND +44 (0) 1622 753662

Fax: +44 (0) 1622 762330

GSOC24 & GSOC26 1U COAXIAL COMMS HANDBOOK CONTENTS Page 2 of2

DATE 12/02/01 MW06-246 ISSUE No.5

SPECIFICATIONS (Yellow Sheets)

48. Commentators Unit Type GSOC24 Specification MW13-14

49. Commentators Base Station Type GSOC26 Specification MW13-15

50. Signals from Commentators Box GSOC24 to Base Station GSOC26 MW13-16

51. Signals from Base Station GSOC26 to Commentators Box GSOC24 MW13-17

52. Commentators Unit Coaxial Cable Specifications MW13-18

G GLENSOUND ELECTRONICS LTD

G GLENSOUND ELECTRONICS LTD. Tel: +44 (0) 1622 753020

6 BROOKS PLACE, MAIDSTONE, KENT, ME14 5HE, ENGLAND +44 (0) 1622 753662

Fax: +44 (0) 1622 762330

COMMENTATORS EQUIPMENT WARNING NOTES

DATE 29/01/98 FILE No PT14-02 ISSUE No. 1

There are two important points to be wary of in this equipment. Both are associated with

the fact that the Commentators Box is powered from the Base Station:-

1) Because current flows in the co-axial cable (aprox 300mAs) to power the

Box, it is inevitable that a potential difference will exist between the Box metalwork and

the Base Station metalwork. On a long line this can amount to several volts. If the

system is then tested with test equipment that shorts these two earths together, the system

can become severely upset and fail. It will resurrect itself when the earth loop is

removed.

2) If you test this equipment with the co-axial cable wound in a coil beware.

The coil of cable forms an inductance. This inductance has 300mAs flowing through it.

If the co-ax is then disconnected a large back EMF is produced. This is large enough to

give you an

* * * ELECTRIC SHOCK * * *

if you are holding the co-ax plug and socket.

G GLENSOUND ELECTRONICS LTD

Date 12/12/00 Information Sheet Number WP14-81 Issue Number 1

Page 1 of 1

G GLENSOUND ELECTRONICS LTD. 5&6 BROOKS PLACE, MAIDSTONE, KENT, ENGLAND.

CO-AXIAL COMMENTATORS EQUIPMENT

GENERAL INFORMATION

COMPATABILITY

This equipment is totally compatible with our previous range of units. In practice it is possible to use our original

GSOC4 commentator’s boxes with our new GSOC23 or GSOC26 base stations. It is equally possible to use our

new GSOC24 commentator’s boxes with any of our original base stations GSOC3, GSOC5 or GSOC8.

A number of additions and improvements are included in this range of equipment. The main difference is that the

commentators box GSOC24 now has provision for 3 instead of 2 commentators. Low voltage phantom power is

provided for each commentator to permit the use of modern headsets with electret microphones. Connectors for the

headset’s are now standardised with a 3 pin XLR fixed socket for the microphone and a standard tip, ring, sleeve

jack for the headphones.

Overall weight and size of the base station GSOC23 is considerably less than it’s predecessor GSOC3. Solid state

line ident recorders are now included for the main programme output and the co-ordination output of each channel.

SYSTEM

A system always consists of a base station and a number of commentator’s boxes. The GSOC23 base station can be

fitted with 1 to 5 channels to operate with 1 to 5 commentator’s boxes. The 1U base station type GSOC26 has

facilities for only a single commentator’s box. Each commentators box is connected to the base station with a single

75 ohm co-axial cable. The maximum length of this cable is 500metres.

TRANSMISSION

Time division multiplex is used to pass 3 audio signals from the commentators box to the base station as well as 7

audio signals from the base station to the commentators box. Simultaneously data is passed in both directions down

the co-axial cable and power is passed from the base station to the commentary box.

G GLENSOUND ELECTRONICS LTD

Date 12/12/00 Information Sheet Number WP14-83 Issue Number 1

Page 1 of 1

G GLENSOUND ELECTRONICS LTD. 5&6 BROOKS PLACE, MAIDSTONE, KENT, ENGLAND.

COMMENTATORS BOX TYPE GSOC24

GENERAL INFORMATION

COMPATABILITY

This commentators box is a development from our original GSOC4 commentators box. It is totally compatible with

our previous range of units. It is possible to use this new GSOC24 commentator’s boxes with any of our original

base stations type GSOC3, GSOC5 or GSOC8.

FACILITIES

Our sketch A2-13462 shows the panels of the GSOC24. It has provision for 3 commentators. Each commentator

can listen to 6 different audio sources. They can individually decide at what level and in what ear they wish to

monitor each source. There is a 7th hidden source namely talkback, which the commentators are forced to hear.

There are 3 internal presets that are used to set this talkback level to each commentator.

All three Commentators can toggle their microphones on or off to contribute to the main mix. Commentators A &

B can, in addition, talk to their ‘home’ or to the local technician using the co-ordination circuit. When the co-

ordination button is pressed, the commentator’s microphone is automatically disconnected from the mix and fed

instead to the co-ordination circuit. Commentator C has no facility to talk to co-ordination. Input C can however be

switched to accept a line level input such as a tape machine, instead of a microphone. Twelve volt phantom power

can be switched to all 3 microphones. Because phantom power microphones generally have a higher output level

than dynamic microphones, we automatically reduce the mic amp gain when phantom power is switched on.

MIC AMP GAIN

All 3 microphone amplifiers contain a very sophisticated circuit to control the gain. This circuit uses a micro-

controller to continuously monitor the input level and to only alter the mic amp gain after considering a complex

algorithm. In practice this means that you should be able to ignore the gain and let each mic amplifier look after

itself.

G GLENSOUND ELECTRONICS LTD Apr 20th 2000

File AP24 - 51

Issue 1

TECHNICAL NOTES

Intelligent Gain Software in GSOC24 Commentators Boxes

GENERAL

The Glensound coaxial commentators equipment has limited dynamic range through the coaxial cable. It is

therefore advantageous to control the GSOC24 commentators box front end gain to optimise the signal to noise

ratio. Each channel input is therefore fitted with microcontroller controlled input amplier along with a limiter

circuit. The microcontroller makes decisions on the correct gain setting by observing how often and how hard

the limiter is asked to work as well as observing the input levels against a number of threshold levels. This

circuit does not respond rapidly but is designed to optimise the gains over a long time period. Operating the

phantom power switch always resets the system and sets the initial gain at a lower level for phantom powered

mics.

SOFTWARE VERSION 1.2

This version of software increases the speed of response and gives the customer options depending on links

available on the PCB.

Normal use is with no links made.

If the Pin 6 link is made then the unit will never increase its gain above the starting point, but will reduce the

gain if the level is perceived to be too high. This setting may be useful for noisy events.

If the Pin 4 link is made then the unit will never decrease its gain from the starting point, but will increase it if

the level is perceived to be too low. This may be useful for quiet events.

If both links are made the gain is fixed.

This fixed gain is nominally 57 dB for normal mics and 44 dB if the phantom power switch is on.

TO CHANGE LINKS

See drawing number A4-13849. This shows the location of each link on the PCB GSN37.

This PCB is located immediately behind the front panel XLRs.

The procedure is as follows:-

Remove front panel ( 4x Screws)

Withdraw the front panel assembly, then the bottom of GSN37 can be clearly accessed.

To make the links it is only necessary to dab them with a little solder and a hot soldering iron.

Replace the front panel.

FACTORY SET UP

Glensound always despatch the commentators boxes in the fully automatic mode. That is with no links made.

LINK TO STOP GAIN INCREASING AUTOMATICALLY

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Glensound GSOC24 Product information

Glensound GSOC24 Product information

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