ASM100 STEREO AM TRANSMITTER USER’S GUIDE
Copyright © 2009-2016 ASPiSYS
Page 2 of 10
Note: Due to constant enhancements to the device’s firmware and/or hardware, this guide is subject
to revision, without prior notice.
ASM100 is a C-QUAM compatible stereo or mono AM transmitter. It achieves extremely high stability
thanks to the latest technology DDS-based frequency generator, which provides better stability than
that typical of PLL-based systems.
To operate you must connect it to your wall outlet AC 220-240V or 110-120V (factory preset) with an
appropriate cable. There is an internal switch that is factory preset for your area. If not sure,
please ask before plugging it in.
To avoid damage, always operate the unit with the RF Out connected to an antenna, or a ‘dummy load’.
Connect your audio source to the corresponding Left and Right RCA jacks, or to the rear XLR if you
have a balanced audio feed.
O P E R A T I O N
ASM100 features a 20-character by 4-line LCD and a 4-button keyboard. When powered up, the LCD
displays a brief version and copyright message followed by the current transmission frequency.
The keyboard buttons (
MENU
,
UP
,
DOWN
, and
ENTER
) which, depending on the keyboard type, may appear
verbally or symbolically, are described next:
[
]/[Menu]
Acts as Menu or Escape. It cycles through all possible enabled menu screens
(sequence
shown farther below)
or selections within a single menu item.
[
]/[Up]
Acts as Up. It cycles through all possible choices in a forward or upward direction.
Menus with only two possible choices use the [
]
key instead to toggle between the
two options.
[
]/[Down]
Acts as Down. It cycles through all possible choices in a reverse or downward
direction.
Menus with only two possible choices use the [
]
key instead to toggle
between the two options.
[
]/[Enter]
Acts as Enter. It enters the Settings screen from any screen. If inside the
Settings screen, it enters the editing mode for the specific item the cursor is
currently on. If editing an item, it stops the editing and accepts the changes. For
menu items that have only two possible options
(e.g., toggle switches)
, pressing [
]
toggles the current option.
Note: Some choices may become active immediately when
selected with the [
]/[
] buttons while most options (e.g., frequency) are activated
only by pressing [
].
I N F O R M A T I O N A L I T E M S
All pages show a combination of at most four of the following predefined informational items.
FRQ:
A line which shows the current OnAir/OffAir status, the frequency of operation in KHz and
the indicator [ST] when operating in Stereo Mode. The OnAir indicator is always steady.
The OffAir indicator always blinks to draw your attention.
FWD:
Shows the measured forward power in Watts. The measurement is based on average (AVG) or
peak-envelope-power (PEP) reading, which is settable by the user in the Settings Screen, but
it normally should not be changed from the manufacturer’s preset value.
FWD measurements are based on the ‘PowerMeterMode’ setting of either ‘AVG’ or ‘PEP’.
REF:
Shows the measured reflected power in Watts. The measurement is based on average (AVG) or
peak-envelope-power (PEP) reading, which is settable by the user in the Settings Screen, but
it normally should not be changed from the manufacturer’s preset value.
Next to the reflected power, an Alert message may be displayed, whenever the reflected power
goes above the ‘Lim REF’ setting, which may be changed from the manufacturer’s preset value
by the user. The ALERT message blinks to draw your attention. If you have turned the
‘Sounding’ setting to ‘On’ a very discrete ticking sound will be heard while the ALERT
message flashes. If you have also turned the ‘Loudness’ setting to ‘On’, the sound will be
much louder and easily noticeable from some distance.
REF measurements are based on the ‘PowerMeterMode’ setting of either ‘AVG’ or ‘PEP’.
Mod:
Shows the modulation level as peak percentage (0 to 120%) and bargraph.
Date:
Shows the current date as Day-of-week, date, month, and year.
Time:
Shows the current time as hours, minutes, and seconds.
Temp:
Shows the current LCD backlight level as percentage followed by the internal MCU temperature
in approximate degrees Celsius and Fahrenheit.
