Ramsey Electronics FM30, Руководство пользователя

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FM30
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FM30 operation is about as simple as it gets. The [SETUP] button cycles
through the various screens, and the [UP]/[DOWN] button adjusts the value on
the particular screen.
First of all, adjust the contrast pot, R1, by turning the orange top to the right
(clockwise as you’re looking at it) until it’s about halfway to its stopping point. If
you don’t do this first you’ll turn the kit on and hear the beep but see nothing
on the display, at which point panic usually sets in along with the assumption
that you’ve made a construction error. Let’s skip all that and do a first adjust-
ment now, then you can set the pot to your individual contrast tastes later.
Next, slide the kit into the case. It’s best to have the kit in the case and know
that there are no stray leads or other objects shorting out traces on the back of
the board when testing (and when operating the kit!).
Connect the included power supply. Also connect your whip antenna. You
shouldn’t operate the FM30 without some kind of antenna; a transmitter
should always transmit into a load of some kind and not into an open, even if it
is operating at a relatively low power output.
Turn the kit on. You should hear a beep and see “FM-30, Rev 1.2” on the dis-
play, then in a few seconds the screen will change to a default display. The
default display shows the current set power, frequency, clipping detector
status, and the VCO voltage while still attempting to lock. Readjust your con-
trast now if you need to.
Pressing the [SETUP] button once brings us to the frequency display. Here,
using the UP/DOWN buttons, we can select our frequency of operation. Note
the voltage display which indicates the current VCO voltage. This helps us
diagnose any problems if something goes wrong. If the voltage stays low
(<0.5V) or high (>9.9V) no matter what frequency we choose, then the FM30
may not be locked.
Set your desired test frequency now. You should choose an open or “dead”
spot on the FM dial as a starting point if you’re not yet sure what frequency
you can transmit on without interfering with anyone. Check the FCC informa-
tion section of this manual for more details on legal part 15 broadcasting. Use
the UP/DOWN buttons to select your frequency.
Pressing the SETUP again gets us to the mode display. Here you can toggle
Stereo and Mono modes.
Another press of the SETUP button brings us to the volume display. Connect
your line level source to the FM30. Your source can be a CD player line out, a
computer sound card line output, or any other audio source you desire as long