The 7000 series comprises the TR-7750 Transceiver, the RA-7203 Receiver and the TA-7650 Transmitter. The radio has a compact and light design, a complete modular assembly and enables a variety of configuration possibilities according to customer specific requirements. Jotron 7000 series VHF Multimode Digital Radio complies to known international standards and recommendations. The Jotron 7000 series VHF Multimode Digital Radio, combines excellent RF performance in congested areas, with advanced digital signalling technique, to cover the future radio communication needs for civilian authorities. Controlled by an ultra fast digital signal processor, makes the radio the ultimate choice for all professional ground to air communication, with easy control, no internal tuneable parts and improved reliability.
Careful analogue design is the key to achieving the best collocation capabilities possible. The 7000 series of radios are designed without compromising the synthesizers and analogue front end. Together with a linear power amplifier design and strict control by an ultra fast digital signal processor, making these the ultimate radios of choice for professional air traffic control applications. The receiver and transmitter use the most powerful digital signal processors to perform the intermediate frequency (IF) and the audio frequency (AF) filtering. In addition, all the modulation and demodulation tasks are performed in the signal processor. This means improved product control, less tunable parts and improved reliability.
Basically all remote products can be used with all Jotron radios with a few exceptions. The mobile radio, TR-810 can not be connected to the remote products. The 3000/4000 series UHF radio can be used together with ORC and DRC provided that you use a 60/15 pin adapter that has RS-485 signals available on the 15 pin side.
Separation between the antennas is critical to avoid interference and blocking of the receiver. To minimize interference try to increase the distance between the receiver and transmitter antennas. Vertical distances between antennas are better than horizontal, since this gives better isolation between the antenna elements.
Be aware that if the antennas installed are rather close to i.e. a steel railing, building etc. This will disrupt the antenna diagram and give poor signals from transmissions in this direction. The antennas should be installed as high and free from any steel structures as possible.
If you still experience interference, the following can be done:
· Increase the antenna separation between the interfering radios
· Introduce extra cavity filters on the interfering radios
· Increase the "insertion loss" of the cavity filter already connected to the TR-75xx to increase Q factor of the filter.
The observed interference can be caused by other radio equipment transmitting in the area. To minimize interference, try to increase the distance between the receiver and transmitter antennas. Be aware that the vertical separation between the antennas is critical to avoid interference and blocking of the receiver. In order to avoid this, more separation may be required. If it is not possible to get more distance between the antennas, cavity filters may be required. The number of filters needed depends on all operating frequencies in the area, as well as where the antennas for the different channels are placed. It might be necessary with filters on both receiver and transmitters.
A path loss calculation will have to be conducted to give an exact range. The range depends on receiver antenna height, output power from the aircraft transmitter and the altitude of the aircraft (Line of Sight) and the sensitivity of the ground receiver.
For 7000 VHF and UHF radios, external fans are not required as long as ambient temperature in the cabinet is below 40 degrees Celsius. For systems with high power transmitters or power amplifiers, fans are recommended.
1: Select RX Config/Audio
2: Select the correct output source:
Line: Output on 600 Ohm audio interface (to VCCS)
Speaker: Output to built-in Speaker
Headphone: Output to RJ45 plug for connection to Headset
VoIP: All data are digital and sent as VoIP packages