Ramsey Electronics FM100B, Instruction Manual

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FM100B
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49
M. FINAL TESTING AND CALIBRATION
We’re almost ready to plug it in. We will need the following equipment to give
it a true test.
An audio source such as a CD player or tape deck.
A microphone with the appropriate jack (3.5 mm Mono).
A receiver (preferably digital tuner).
The tuning tool sent with your kit.
1M. Make sure the power switch is off. Plug in your FM100B to line power.
2M. Turn on the FM100B. All of the used digits of the display should light
(like this 1.8.8.8.), the speaker will beep, and then go to some frequency.
3M. The FREQ LOCK light may or may not light. We will get to that later.
4M. Press both frequency buttons (FREQ UP and FREQ DN ) at the same
time and hold them in for three seconds to enter the frequency set mode.
The FM100B will confirm your mode selection with 3 short beeps and the
far right decimal point will begin to flash. Note that the far left decimal point
will also flash if the unit is in stereo mode.
5M. Press FREQ UP or FREQ DN until the display shows 108.0 MHz (if it
does not already).
6M. Press both frequency buttons again and hold until you hear the triple
beep confirmation. This means the settings have been saved in Flash.
7M. Press both the auto AGC and the Microphone buttons. Your display
should now show the voltage of the PLL’s voltage controlled oscillator.
8M. Using the included plastic tuning tool, adjust L1 until the lock LED
lights. This should be around 8.9 VDC.
9M. Press both the Mic and AGC buttons to switch back to the standard
frequency display (you can toggle this way to the PLL voltage display
mode at any time to see where the unit is set).
10M. Press and hold both the FREQ UP and FREQ DN buttons again until
it gives you the confirmation beep and the far right decimal point flashes.
11M. While watching the lock LED, run the frequency from 88.0 MHz to
108.0 MHz. The lock LED may occasionally flash off while switching but it
should come back on and stay locked for the entire frequency range. If it
does not, you may need to gently adjust L1 a bit to bring the entire range in
better (the rollover lock time from 88.0 MHz to 108.0 MHz = 20 sec or so).