Originally Posted by cabletech
The 5021 requires that the UT-109R scamblers option board be intalled in the radio. it is a addon board that just plugs in on the main borad.
No board, no scramble.
The F3160 portables (and several other Icom radios) come with a built-in INVersion scrambler. Its is an option under "Memory Channel | Scrambler | Type. The F5021 does not have the "Type" and "Inv" options.
In the F3161 software:
*UT: only works if a UT-109 or UT-110 is installed. The -109 supports multiple fundamental frequencies but not rolling codes. The -110 does the same as the -109 and also supports "Rolling Code" where the frequency changes every so often.
*INV: similar to a -109/-110 but only operates on a single inversion frequency that is not available on the -109/-110. Not available on 121 and 5021 versions even in the latest v3.3 firmware.
*Oth: supports other manufacturer's boards, ie Cimmeron.
*ON/OFF: this is what you have your "P" button programmed to control. The "ON" setting will put the channel into full time encryption and the "P" button switches to clear, "OFF/Blank" means encryption is off until you use a "P" button to turn it on, and "Inh" where encryption cannot be activated at all.
* "Code" only applies when -109 or -110 boards are installed and selects the fundamental inversion frequency.
The "R" at the end of the board model refers to the package and connector type.