The LGB605-2 is the new version of the LGB605 adapted to the new constraints and wishes of the operators.

The synoptic resumes from LGB605:

• Amplification of the microphones of the driver, the journalist and a micro-hand for the interview during the race of sports managers or others. (The microphone inputs are balanced with phantom power and have very low noise stages)
• Management and amplification for the pilot's and journalist's helmets.
• Reception of Radio Tour, radio information and details of the race for technical participants.
• Management in complete multiplex by HF of the connection with the reporting truck located at the finish stage. This connection is made via a helicopter or an airplane located above the race.
• Multiplex management of a GSM phone for talkback coming from the control room
• Talkback management between the pilot and the journalist.
• The central box allows you to adjust all the input and output gains, as well as the choice of switching for both the pilot and the journalist of this or that modulation in the right, left or both ears.
• A small outdoor speaker with amplifier to broadcast Radio Tour acoustically.

The synoptic + of LGB605-2:

• The pilot and the journalist can select, for the modulations Radio tour, HF antenna, and local pilot/journalist talkback modulations, the sending in the right ear, the left ear or both at the same time.
• Two internally adjustable amplifiers are intended to supply two LED meters for viewing HF output and talkback by the pilot (LGB 110 option).
• The external loudspeaker can be powered either by Radio Tour or another auxiliary modulation.
• The micro-hand input stage has been modified with phantom power so that you can add micro / line switching or a multimedia interface outside.
• The EMC input / output filters have been hardened to adapt to the new frequencies of HF transmissions.
• The sensitivity of the three pilot microphone, journalist and micro hand inputs are adjustable from outside the box without opening the equipment.
• All electronics and settings are integrated into the LGB605-2, VCA volume controls and assignments will be outside and will be reduced to simple knobs and switches.

We had to face many constraints which we will detail below:

- Vibration constraints: It is obvious that one cannot conceive of mobile equipment integrated on a motorcycle like a lambda device. We first reproduced on a vibrating pot, the vibrations of the engine and we then mixed them with a model reproducing the tremors of the road. We were thus able to eliminate many components and connectors that did not pass the tests, sometimes even after several hours. The selection for fixing the modules among all types of "silent block" was an integral part of the technical study. We now have experience of what to do and what not to do.

- Sealing constraints: As above, apart from the central module, all the controls are exposed to climatic elements. We had to select completely waterproof switches, potentiometers and connectors. In fact, the pilot and the journalist have selection and gain controls which are by definition arranged outside, for quick access.

- Temperature constraints: The central module is housed in a rear bag, but due to sealing constraints it is impossible to ventilate the interior of it properly. We first tested Peltier cells for cooling, but we abandoned them because of the excessive consumption; only the motorcycle battery is a source of energy. We reviewed the copy by selecting components at a very low temperature rise, and after numerous tests in a closed enclosure placed in an oven, the solution was viable. We always had in mind that during the ascent of mountain passes, the temperature can be very high, due on the one hand to the climate, and on the other hand to the very low speed of the vehicles, which does not favor not the natural ventilation of the motorcycle engine. This experience was very enriching and will be able to help us in the future in the design of very energy-efficient equipment.

- EMC immunity constraints: We have chosen to control the gain of the various amplifiers and multiplexers by VCA commands (as on our Broadcast consoles) to minimize the influence of the various high frequency transmissions on the connections. All the active parts are concentrated in the central element, whose accesses have been filtered and shielded to harden as much as possible this equipment at the EMC level.