ASA Electronics MS-306 - Manual (Page 10)

Audiovox Specialized Applications, LLC
T E C H N I C A L B U L L E T I N
AM/FM RECEPTION
Many vans and RV’s have more than one
AM/FM radio. The best way to insure good reception
is to supply a separate antenna for each radio. Other
options available to supply adequate AM/FM reception
to these radios are listed below, along with some
general information in regards to radio reception.
“Y” ADAPTERS
The “Y” adapters used to connect one antenna
to two radios will only provide AM reception to one of
the radios and will compromise both AM and FM
reception.
AMPLIFIED AM/FM ANTENNA
A popular second antenna that can be used is
our AB-100 amplified AM/FM antenna. It is small
and has a retractable mast that can be mounted
vertically or horizontally. This antenna provides
good FM reception, but the AM reception will be
compromised to some degree because of the length
of the mast.
MAST LENGTH
AM/FM antennas compromise AM reception
by design. The optimum mast length for FM is
approximately 30 inches which is standard for most
automotive antennas. The optimum mast length for
AM reception is over 100 inches which is not
practical for mobile applications.