we have diagnosed the fault in that the antenna
tuning unit (Icom ATU 130) will not tune with the transmitter (the black box). When I have a friend's transmitter installed, it tunes, relays rattle through all sorts of frequency changes.
We have checked the switches inside the transmitter are correct for the AT-130 tuner (which was replaced last month based upon the diagnosis of the professional technician who believed he had found the problem).... We have also checked the quad (controller) cable, insulators etc, grounds etc.
As said earlier, it works with another (older) transmitter in - the relays click correctly.
Does anyone have any ideas on what may be further tested within the transmitter box, and whether or not it's worth getting professionally attended to, or to get a new one. Age of the unit is circa 17 years.
Thank you in anticipation.