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• Hold [TEST] to put the K4 in TX TEST mode, so you won’t be
transmitting. The TX icon will change to TX Test.
• Set {XMTR} <MIC> high enough to hear your voice (typically 10-20).
• Press your mic’s PTT switch or tap [XMIT].
• Hold the {XMTR} knob to enable [MON] adjustment. While speaking
into the mic, set the desired level. Tap {XMTR} again to exit
the [MON] function.
• To set the LINE OUT voice monitor level, use MENU:TX Monitor Line
Out.
• Exit transmit (release PTT, or tap XMIT again).
Mic Gain and Compression Settings
To set up mic gain and compression, follow the instructions
below. Note: Speech compression only applies to SSB and ESSB
modes.
• Adjust the monitor level if necessary (see previous section).
TX TEST mode is recommended during the following adjustments so a
signal is not transmitted. This will not affect your CMP/ALC bar graph
readings. To enter TX TEST mode, hold [TEST]. The TX icon will change
to TX Test.
• Set {XMTR} <CMP> to 0. This turns compression off for mic gain
adjustment.
• While speaking into the microphone in a normal voice, adjust
{XMTR} <MIC> for a peak ALC meter indication between "5" and "7".
• Adjust {XMTR} <CMP> for the desired speech compression level
while speaking. When you speak, the CMP bar graph shows
approximate compression amount. Typically, a CMP value of 0 to 10 is
used for casual QSOs, while higher compression is used if band
conditions require extra "punch."
IMPORTANT NOTE REGARDING EXTERNAL AMPLIFIERS: The K4 uses an
advanced speech compression algorithm, plus Controlled Envelope
Single Sideband (CESSB). CESSB is turned on with any non-zero setting
of CMP. When CMP is set to maximum (30), average talk power will be
increased by as much as 8 dB. This increase will also apply to any
external amplifier, potentially increasing its average power dissipation,
current drain, and temperature. Be sure to observe all manufacturer
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