RF FAQ
Most likely issue is that one of the neutralization capacitors (C7, C8, C17, or C18) are shorting under low screen voltage. Remove the neutralization s...
Tue, 8 Oct, 2019 at 1:08 PM
It is possible that the LVDS (Cat 5) cable is not connected/defective, the transmitter is in FM Only mode, or the HDC from the XPi to FXi has dropped out.
Tue, 8 Oct, 2019 at 1:10 PM
Why do the F1 fuses on either the PA modulator or the PA boards of my AM transmitter routinely open?
ther than a hard failure of a device or component drawing excessive current, the most likely cause is that the fuse clips for the fuse have overheated and/o...
Tue, 8 Oct, 2019 at 10:20 AM
The CPE board may be set for isolated ground. Verify the isolated/non-isolated ground jumper on the CPE board J9 is in the 1-2 position. This connects the...
Tue, 8 Oct, 2019 at 1:13 PM
Other than a hard failure of a device or component drawing excessive current, the most likely cause is that the fuse holder for the fuse has overheated and/...
Tue, 8 Oct, 2019 at 1:14 PM
Other than a hard failure of a device or component drawing excessive current, the most likely cause is that the fuse holder for the fuse has overheated and/...
Tue, 8 Oct, 2019 at 1:15 PM
If the power on your FMi C Series transmitter seems to drift up or down in output power over time or whenever my air handling system turns on, the problem m...
Tue, 8 Oct, 2019 at 1:18 PM
Remove tube and check the filament rings to ground; normally the Ohm meter will indicate zero Ohms. If the filament rings indicate an infinite resistance, c...
Tue, 8 Oct, 2019 at 1:23 PM
Most likely issue is that R4 (10 watt 1.5 Ohm resistor) in the grid circuit is open. A temporary fix is to create a coil of 10 turns of #24 wire around a pe...
Tue, 8 Oct, 2019 at 1:21 PM
If the button does not stay selected unless it is held, the problem is most likely associated with the C53 and C55 capacitors in the power supply section of...
Tue, 8 Oct, 2019 at 2:04 PM