RF FAQ

Where is the programming switch in the Combiner for my ET10000, ET15000, ET20000, ET25000, ET30000 transmitter in order to load software?
The black programming switch is located behind the mesh front panel of the Combiner Unit, you will need to use a flashlight in order to see it, the location...
Wed, 11 Jan, 2023 at 9:36 AM
Why are all the lights extinguished on the front of my AM TXs ECU unit?
Assuming that the TX has main AC applied, the most likely cause is the low Voltage power supply has failed in the ECU. The most common failure of the supply...
Tue, 8 Oct, 2019 at 10:19 AM
Why can't I increase the output power of my STX? By the way the PAV is remaining at 17 Volts.
Try reseating the +48 Volt main PS.  Next, check J2-5 on the +48 Volt PS.  If there is no control Voltage there, remove the main AC input to the STX Transmi...
Tue, 8 Oct, 2019 at 1:03 PM
Why can’t I raise power on my “C” series TX while having a Power Supply and/or PA Module fault?
Make sure jumper J719 is NOT installed on the Controller board; this jumper disables/inhibits the power raise/lower command when the Tx is reading a fault s...
Tue, 8 Oct, 2019 at 1:06 PM
Why do I get a screen over load on my FM-T or FMi-T TX with less than 100 Volts of screen Voltage?
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
Why do I not have any digital carrier output of my FMi series transmitter?
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
Why do the GPIO inputs on the back of my CPE equipped unit seem to be intermittent?
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
Why does the FM 250C exciter F1 15A fuse routinely open?
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
Why does the FX 50 exciter F1 12A fuse routinely open?
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