Mark01
Member
Question for anybody knowledgeable in electronics .
I am using a GaAsFET preamp on a beam antenna mounted in an attic my power supply to the preamp is a 12vdc regulated walwart with the positive wire soldered to the external + positive pin and the negative wire soldered to the external - negative pin , about 30 ft of rg6 connects to my scanners,the scanners are powered by walwart power supplies.
I am using a GaAsFET preamp on a beam antenna mounted in an attic my power supply to the preamp is a 12vdc regulated walwart with the positive wire soldered to the external + positive pin and the negative wire soldered to the external - negative pin , about 30 ft of rg6 connects to my scanners,the scanners are powered by walwart power supplies.
The problem is the GaAsFET in the preamp tends to blow out ,what i've been told is the reason this happens is that this is a "floating ground type setup".I popped the preamp case open and sure enough it's only grounded to the metal preamp case,so it does not have a real ground.I've been advised to take the ground wire from the walwart and connect that elsewhere and not on the preamp metal case. I am soliciting any help or ideas where to run the ground from the walwart?