Early ADI Mods





Early
ADI Modifications

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In the early 1990s ADI
produced several radios in an attempt to break into the amateur
radio market. These included the AT-18 and Sender 145 (both for
VHF) and the AT-48 and Sender 450 (UHF). All of these radios used
the same modification procedure. The expansion is listed below.

NOTE: In the U.S. it is
illegal to use this radio on any band for which it is not type
accepted and on which you are not licensed. Perform this
modification at your own risk!

1) Turn the radio on.

2) Hold down the
"F" key and press the "LAMP / A" key. The
radio's lamp will light.

3) Hold down the
"F" key and press the "PL / B" key. The
letter "PL" will be displayed on the display.

4) Hold down the
"F" key and press "0."

5) Press the
"5" key. The display will show both "PL" and
"APO."

6) Hold down the
"F" key and press "0."

7) Press the
"8" key. The transmit frequency range of the unit will
now be expanded.

If you ever need to
return to the factory default frequency range of the radio you
must use the following procedure. Simply performing a soft reset
(by turning the radio on while holding down the "F"
key) will NOT return the radio to it's default frequency
settings!

1) Turn the radio on.

2) Hold down the
"F" key and press the "LAMP / A" key. The
radio's lamp will light.

3) Hold down the
"F" key and press the "PL / B" key. The
letter "PL" will be displayed on the display.

4) Hold down the
"F" key and press "0."

5) Press the
"5" key. The display will show both "PL" and
"APO."

6) Hold down the
"F" key and press "0."

7) Press the
"9" key. The radio now returns to default (amateur band
only) frequency coverage.

NOTE: Some later
versions of the AT-18, AT-48, Sender 145, and Sender 450 used the
same frequency expansion procedure as the AT-200 / 400. If the
expansion procedure listed above does not work on your radio try
using the expansion for the AT-200 or the AT-400 instead.

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