26
Transmitter Setup
Transmit Crystal Filter Considerations
For each operating mode, you must specify which
I.F. crystal filter to use for transmit using the
CONFIG:FLTX menu entry. See pg. 46 for
recommended per-mode transmit filter bandwidths.
Transmit signals are generatedon the RF board,
so the set of filters installed on the RF board must
meet thetransmit bandwidth requirements of all
modes you planto use. (Filters installed on the sub
receiver board are used only in receive mode.)
Transmit Status LEDs and Icons
Before putting the K3 on the air, you should be
familiar with the LEDs and LCD icons that pertain
totransmit operation (identifiedon pgs. 11 and12).
The most important ofthese are reviewed here.
The TX LED turns on during transmit. The ∆F
(Delta-F) LED turnson if the transmit and receive
frequencies differ (SPLIT / RIT / XIT).
The TX LCD icon and associated arrows show
which VFO is being used for transmit. If you plan
to use SPL IT mode, See pg. 36.
Multifunction Transmit Controls
There are two multifunction transmit controls. Their
primary functions (mode-dependent) are:
SPEED CW keyer speed in WPM
MI C Mic gain
CMP Speech compression level in dB
PWR RF output power in watts (also see
Per-Band PowerControl, pg. 27)
The secondary (hold) functions ofthese controls
are:
DELAY VOX or CW semi-break-in delay
MON Voice/Data monitor or CW sidetone
level.
VOX, PTT, and QSK
In voice and data modes, use VOX to select VOX
(pg. 13) or PTT (push-to-talk). PTT can still be
used even with VOX selected. Set VOX gain and
anti-vox level using MAIN:VOX GN and
ANTIVOX.
In CW mode, use VOX to select either VOX or PTT
transmit. VOX enables “user-activated” (hit-the-
key)transmit, while PTT requires the use of PTT
IN (pg. 17) or XMIT before CW can be sent.
When the VOX icon is on in CW mode, you can
use QSK to select full (QSK icon on) or semi
break-in. For more on break-in keying, see pg. 30.
Transmit Metering
Normally, the transmit bar graph shows SWR and
RF (power output).The displayed SWR range is
1:1 to 3:1. The RF control range is0 to 12 W in
1-W units, or 0to 120 W in 10-W units. The power
scale changes from watts x1 to watts x10 at 13
watts.
In voice modes, you can use METER to switchto
compression (CMP) and automatic level control
(ALC) metering. See pg. 28 for information on
adjusting the MI C and CMP controls.
If you have a KXV3 installed, you can use
milliwatt-level power output. This is intended for
use with transverters, but it can also allow the K3to
act as a very stable, very low-noise signal generator.
To route RX andTXthrough the XVTR jacks on all
bands, set CONFIG:KXV3 to TEST.
When milliwatt-level output is in effect, rotating
PWR will show milliwatts on VFO A, and dBm
(dB relative to 1 milliwatt) on VFO B.
Off-Air Transmit Testing
The K3 allows youto listen to your CW keying, test
your mic and compression settings, or monitor
DATAtones, without transmitting an on-air signal.
To do this, hold TEST (right end of the MODE
control). While you're in TEST mode, the TX icon
will flash slowly as a reminder that you're off air.
Hold TEST again to returnto normal operation.
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