TR-7750U UHF AM Digital Transceiver 50W

Part Number: 87100C

Jotron series 7000 UHF digital radios are designed to provide ground to air communication for professional users in the air defence frequency range. The radios provide excellent audio performance together with unmatched RF performance in tough electromagnetic environments. Voice over IP, AM and FM modulation, remote control via SNMP and high MTBF are factors that make this a necessary tool for the professional market. 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.

  • Excellent RF performance in congested areas
  • Advanced digital signal processing (DSP)
  • Remote control through Ethernet
  • Easy set-up and control
  • Compact design
  • In-band signalling for PTT and squelch
  • Continuous duty cycle
  • Offset carrier
  • VoIP according to ED-137
  • Start-up time <10 seconds
  • Parallel operation (analogue and VoIP interfaces)


  • EN302 617 (AM)
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.
Antenna separation of 400-500 meters or more will be interference free. The exact distance depends on the operating frequencies and the output power from the transmitters.
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.
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.
Yes, TR-77xx will use SNMP interface.
ED137 protocol is an open protocol which is used to communicate with VCS systems.
Due to the fact that the transmitters are equipped with internal fans that gives better control of inside temperature.
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.
No. The TR-77xx transceiver uses RJ45 connectors in stead of Dsub connectors. An adapter card is available.
You should be aware that after changing the IP address, it is required to go back to main menu and then reset the radio. When the radio boots up again, the new IP address is stored.
Carrier offset, in-band signalling, VoIP, G729 compression, extended frequency range (144 or 156 MHz).
14.12.22 Marketing material Product brochure 1,004 KB
29.04.23 Declaration Declaration of conformity 164 KB Download
29.04.23 Declaration Declaration of conformity PSU 7006-7009 147 KB Download
Part Number: 86268 Spare part module
Part Number: 89001 PSU-7008
Part Number: 89002 PSU-7009