13
TECHNICAL NOTES
Radio Compatibility:
Midian has taken the utmost care to ensure the option board integrates into the radio with
minimal impact to the features of the radio. However, some features may not be available in the radio when an
option board is used. If a feature is not available, please contact Midian to see if the feature can be added.
Radio Firmware:
Midian recommends having the latest firmware in the radio when installing the scrambler.
However, it should be noted that occasionally firmware updates may cause a conflict with proper option
board/radio communications. This may appear that the scrambler is not working properly, but it is a conflict in the
serial communication between the option board and radio. If this happens it will be necessary to go back to the
original firmware revision.
For installation into MPT-1327 capable portable radios Midian recommends a minimum radio firmware version of
R02.04.00. Firmware versions prior to this did not allow option board operation in both conventional and trunked
modes.
For installation into the GP-1280, HT-1550-XLS, PRO-9150 and PTX-780 Midian recommends that the radio
firmware version be no less than R05.09.15. Please note that firmware versions between the EMEA region and
the Asia and America regions might be different.
Scan:
Midian strongly recommends not using the radio’s Scan function when using voice scramblers. First of all
synchronization packets will most likely not be decoded by the receiving radios, as the receiving radio may be
looking at a different channel when sync is transmitted. Additionally if using a combination of scrambling on a per-
channel basis and a mode select button to control the state of the scrambler, when the scan function is used the
radio will ignore the button. This is best resolved by using per-channel scrambling OR a mode select button, but
not both. If using scan and a mode-select button the Option Board Feature box in the radio programming section
must be enabled on all channels.
Known Issues:
The "Enable Wired PTT" function on the "Radio" screen of the MPS UP is obsolete. This box
should never be checked. The "Combo (press & hold)" and "Emerg (press & hold)" are not supported on the side
buttons when using Enhanced Integration. Use of the System Scan feature of the radio has been known to cause
a problem whereby the transmitter stays on the air 3 seconds after PTT is released. Checking the "Reserved
Function" box on the "Advanced" screen of the MPS UP works around this radio problem.
Option Board Feature:
Enabling the option board feature tells the radio to report events such as button press,
PTT press, carrier detect, etc. to the option board. This feature enables communication between the option board
and the radio.
When controlling the scrambler with a radio button, it is absolutely required to enable this feature on all channels.
For scrambling on a per channel basis only enable the option board on scrambled channels and the power up
mode of the scrambler should be Scramble. On display models, the following icon appears on the LCD when
option board mode is on:
MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS, INC.
2302 East 22
nd
Street
Tucson, Arizona 85713 USA
Toll-Free:
1-800-MIDIANS
Main:
520-884-7981
E-mail:
Web:
www.midians.com
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