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sent to the configured Icom radio CI-V address telling the radio to turn Split OFF, which is a
command '0x0F'. Then a "Select Main readout" command 0x07 subcommand 0xD0 is sent, so
that if the sub readout was selected, it will be reset. Then a sent frequency command 0x05
containing the new frequency data, such that if the sub readout was selected, the new frequency
will now be selected. The net result is an unwinding of both split and sub receiver.
Note: The PC control program is not notified of the change of state and will only discover
the change of state if it polls it.
Note: Not all Icom radios support these command.
Driver Power Level Table
Introduction
One feature of the K9JM CI-V router is the ability to store a table of driver (exciter) power level as
a function of frequency. If enabled, the router will generate a command to the ICOM radio to set the
power pot whenever the radio tunes to a different band segment.
Note: The factory default settings for the CI-V router is to have this featured disabled.
Note: PC based programs which set the RF power may be confused by this feature as mes-
sages are sent to the radio and the PC based program will not be notified by this change.
Why?
There are three reasons why to enable this feature:
1. Operation with amplifier other than an Icom PW-1
2. Improved transmit quality while using the Icom PW-1
3. Protect the amplifier
Many amplifiers either do not have ALC or the ALC does not work well with Icom radios. Reduce
the amount of ALC adjustment needed by the Icom PW-1 amplifier.
ALC, is a flawed concept. It is analogous to the old idiom, "closing the barn door after the
horse has bolted". The ALC turns down the driver power level, after the amplifier has gone
into distortion. The exciter is best able to limit peak power output without having to rely
upon an amplifier to tell it that it was driven to distortion. Using ALC will cause periodic
distortions, or key clicks as the amplifier ALC forces the exciter power level down. It is best
if the exciter power level is set properly and no ALC is required.
Even with ALC, the exciter will over drive the amplifier for a short duration, which depending on
load, maybe enough to cause arching or damage to the amplifier.
It is a good operating practice.
Will this work with my radio?
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