599 / Eagle Users manual
Release 1.002 – September 27, 2010
15
Part #74447
Printed in USA
Chassis ground and mic signal ground are
separated to reduce the possibility of
introducing stray hum or RFI into transmit
audio signal. We recommend that the case of
the microphone also be tied to chassis ground
on the transceiver via a shielded cable to pin
5. This is to help assure stray RF does not
have a path to be coupled into transmit audio.
Cable carrying mic signal and mic signal
ground should be shielded. This prevents the
cable itself from acting as an antenna and
coupling RF back into mic audio. NOTE!
Some aftermarket microphones are not wired
with separate microphone signal grounds and
chassis ground. We recommend separate pins
for use for mic negative signal and chassis
ground as shown in Figure 2.2-2
MIC: (11)
To adjust the microphone gain simply press
the MIC button on the Eagle and view the
letters MIC on the front display with numbers
to the right. At this time key and speak into
the microphone to adjust the MIC gain. Use
the MULTI knob until the ALC light begins
to flash on voice peaks. Your Eagle is now
transmitting with proper ALC levels for
undistorted SSB operation. Ten-Tec has set
the
hardware
microphone
level
to
accommodate the standard hand microphone.
If other microphones are used with the Eagle,
which may need more gain, Ten-Tec has
provided a hardware microphone gain
control, See Figure 2.2-3. Setting the
microphone gain around 35-50 and then
adjusting the trim pot on the left side of the
transceiver until proper ALC is accomplished
will help make the Eagle flexible with a
multiple of different style microphones.
Figure 2.2-3 Hardware Mic Gain Control
TEN-TEC
AF
RF
MR
AN
SP-CW
BW
PBT
A=B
VOX
PWR
RIT
AGC
PRE
SQL
MON
(
$*/(
NR
MIC
FNC
LOCK
ATTN
FAST
BAN
MOD
TUNE
A/B
NB
