FM100B • 52
audio sections. These are usually a bugger to find without a signal tracer or an
oscilloscope. Inject a signal into both sides and trace through the circuit. Com-
pare one channel to the other all the way through the circuit until one side is
not present.
PROBLEM: Very distorted sound.
SOLUTION: Turn down your level controls. If that does not help, check your
power supply voltages. If a negative or positive supply is not there, the signal
will be lousy.
PROBLEM: Still lots of AC hum in the audio.
SOLUTION: Make sure it’s not coming from your other components in combi-
nation with this unit. Some components don’t deal with RF very well. We once
had a CD player that wouldn’t even play with low power RF nearby. Try using
ferrite beads around the audio connectors. You can find the beads in com-
puter accessory magazines and electronic magazines. You may be also over-
loading your receiver. Try moving the transmitter and receiver further apart or
turn R3 CCW to decrease your output power.
PROBLEM: The unit doesn’t store last frequency.
SOLUTION: Don’t forget to get out of setup mode by pressing both frequency
buttons to set the frequency before shutting off the power.
PROBLEM: Unit doesn’t transmit very far, less than 100’.
SOLUTION: Try spreading out the windings of L3, L4, and L5 a little. This will
lessen their inductance and change the tuning of the lowpass filter. Otherwise
check assembly in section G.
PROBLEM: I just can’t get the darn thing to work! It’s Ramsey’s fault.
SOLUTION: Give us a call at (585) 924-4560. While some problems can be
answered on the phone, others cannot. Read the warranty information in the
manual for information on how to send your unit in. Upon its return it will be
fully functional according to our specifications.
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