Navnet VX2 Radar only works to 2NM

[Daryl S]

I have just installed a used Furuno VX2 radar. It was working fine until I started familiarising myself with the settings. I didnt think I changed anything that could result in the radar now only producing a picture when the range is set at 2NM or less. From 3NM and higher there is only a faint picture of nearby land mass. The problem seemed to start when I changed the range group, where the different ranges can be switched on or off. I didnt note which were on and which were off at the time and this shouldn't have caused the problem. Normally I would say the magnatron has failed but it was working fine and only stopped working while I was messing with the settings. I dont really want to get a technician in just to fix a possible setting switch. Any ideas?