Adjusting Your Fm10C - Ramsey Electronics FM10C Manual

ADJUSTING FM10C TRANSMITTER
Keep all tests very brief until you have carefully chosen an open operating
frequency in the FM broadcast band.
1. Transmitting Frequency:
After finding a suitable "open" frequency in the 88-108 MHz FM band, adjust
L4 with the plastic alignment screwdriver until you hear the carrier frequency
on a nearby FM radio. No audio input is needed to make this first adjustment,
you can simply listen for a "quieting" in the normal background noise "hiss."
2. Audio Connection:
Adjust both Left and Right level potentiometers (R3, R4) to full counter-
clockwise rotation. This is the minimum level position.
Connect the left channel only. Slowly increase R4 until a distortion is heard
in the right channel. Back R4 down slightly until distortion disappears. Re-
peat the process for the right channel and R3.
Hooking up an audio source to your FM10C is really quite simple. However,
there are some general rules:

A terribly distorted sound is a sign of too much audio level. Simply ro-
tate the level potentiometers, R3 and R4, CCW to reduce the level.
Make sure you rotate each one about the same amount to maintain
proper stereo balance.

Stereo LP turntables are low-level output and will require the use of a
preamplifier for proper audio input to the FM10C.

NEVER connect the FM10C audio inputs to speaker outputs of a high
power stereo system; such a connection will destroy the IC chip.

Consider using a mike mixer for professional "radio station" sound. It
will allow you to easily fade, mix and switch between various audio
sources.
3. Stereo balance:
Adjust R7 for correct stereo balance (near the middle of its range). The better
your ear for music and your understanding of quality audio devices and inter-
connections, the better will be the performance of your FM10C.
FM10A 20