RF FAQ

How to install a low voltage power supply in a BE AM TX ECU
See the attachment for a step-by-step instruction on how to change out the low voltage power supply in our AM transmitters ECU cabinet. AM TX LVPS CHANG...
Mon, 16 Jan, 2023 at 2:17 PM
How to replace a BE FM Tube?
If you have a new tube and need to replace the old tube these are some quick steps to help you get this done and get you back on air.  Steps to replace ...
Thu, 12 Jan, 2023 at 10:10 AM
How to troubleshoot humming from the AM TX's.
How to troubleshoot AM TX humming.  Unhook your Audio going to the transmitter.  Listen to your station and see if you hear any humming with the transm...
Fri, 13 Jan, 2023 at 2:32 PM
I am using a non BE exciter with my FM-T TX and can't get the interlock functioning. What's wrong?
The BE exciter has a Frequency Lock (AFC) output connection that goes low when the exciter is locked on frequency. If the OEM exciter does not have this fea...
Tue, 8 Oct, 2019 at 10:48 AM
I have a flashing or dead front panel on my “C” series transmitter, what can I check?
Most likely the problem is the Controller power supply. Disconnect the J704 wire cable on the Controller board and with basic AC power applied to the transm...
Tue, 8 Oct, 2019 at 10:51 AM
I have a missing +20V indicator on my FX 50 Exciter, what could be the problem?
On the power supply/control board, measure TP5 for +20VDC.  If TP5 is not +20VDC, then U1 LM338 Positive Voltage Regulator (part number 227-0339) on RF Amp ...
Tue, 8 Oct, 2019 at 10:54 AM
I have a missing +20V LED indicator on the front of my FM 100C Exciter, what is damaged?
Most likely the U402 voltage regulator (part number 227-0339) is faulted. This can be checked by measuring TP5 on the PS Control board. If +20V's is pr...
Tue, 8 Oct, 2019 at 10:55 AM
I rebooted my FSi, XPi or ASi with the wrong boot disk. What do I do now?
If your unit was loaded with the wrong software, there may be a chance that it is in a continual reboot cycle now.  If that is the case, please view and sav...
Tue, 8 Oct, 2019 at 10:56 AM
My AM TX won't power up and the 3 green LED's (DS1-3) on the Exciter are extinguished. What's wrong?
The most probable cause is a failure of the ECU Power Supply (P/N 540-0006).
Tue, 8 Oct, 2019 at 10:02 AM
My FXi Exciter GUI is extinguished and the fan is off, but the Green Power Led is lit. What's wrong?
Check all the fuses on the 919-0540 Power Supply Board. If all are ok, contact BE RF Technical Services to arrange for a replacement or to have yours repair...
Tue, 8 Oct, 2019 at 11:03 AM