ELECRAFT 95
SSB Operation
You can use SSB and RTTY/data modes if you have the KSB2 SSB
adapter installed. Basic information on using the SSB adapter is
provided here. For complete details, refer to the KSB2 manual.
SSB Controls
Operating Mode: Use M O D E to select L (LSB) or U (USB). To
alternate directly between USB and LSB, use
C W R V . LSB is usually
used on 40 meters and below, and USB is used on the higher bands.
Crystal Filter Selection: If the SSB adapter is installed, you'll be
able to take advantage of its 7-pole fixed-bandwidth filter. The
fixed filter is designated OP1 in C A L F I L . In addition to its
application to SSB and data modes, it can be used for CW and AM
reception. Refer to the KSB2 manual.
SSB Menu Entries: S S B A is used to set the mic audio level (mic
gain), from 1 to 3 . An additional setting, B A L , is used during SSB
adapter alignment. S S B C is used to set the speech compression
level, from 1 - 1 to 4 - 1 . Higher settings add "punch" and are
especially useful at low power levels.
PTT/VOX Selection: By default the K2 uses PTT (push-to-talk)
via your microphone’s PTT switch. To use VOX (voice-operated
transmit), hold the
V O X switch until you see S P C H 0 . 4 or
S P C H 1 . 0 on the LCD. The number 0.4 or 1.0 is the
approximate VOX delay time in seconds. Holding
V O X again
restores the setting to P T T .
Power/ALC Metering: If you have the SSB adapter installed,
you’ll be able to switch between RF and ALC bargraph meter modes
by holding
R F / A L C . ALC metering is used only in SSB modes, and
may help in setting the mic gain and speech compression level. The
ALC reading starts from the right end of the bargraph rather than
the left, using BAR mode, so you won’t confuse it with the RF
display. Use RF meter mode for normal operation.
Microphone Configuration
You’ll need to configure the MIC CONFIG header on the Front
Panel board in order to transmit SSB on the K2. Most microphones
with standard 8-pin connectors can be used. On many mics, the Up
and Down buttons can be configured to switch between VFO A and
B. You'll hear one beep on switching to VFO A, and two beeps when
switching to VFO B.
RTTY/Data Operation
RTTY/data operation can be accomplished in SSB modes by using
AFSK (audio frequency shift keying) or other modulation modes.
Audio must be fed into the mic jack from a computer or modem,
and the K2’s audio output routed to the computer or modem from
either the headphone or speaker jack. Either LSB or USB can be
used; this will probably be determined by your software. You can use
either the SSB adapter's fixed filter (O P 1 ) or the variable-
bandwidth crystal filter for receive purposes. On transmit, O P 1 is
always used.
Since some RTTY/data mode duty cycles approach 100%, you
should reduce power to about 5W or avoid transmitting at 10W for
longer than 1-2 minutes at a time. (Power levels above 10 W are
not recommended.) You can key the transmitter via either the key
jack or the mic jack, since the DOT line is also the PTT line.
RTTY/Data Mode (mode letter r ): This is a special fourth mode
of operation that provides independent crystal filter selections for
use with RTTY, PSK31, etc. For details on configuring and using
RTTY/data mode, see page 101.
FINE RIT: Fine RIT allows you to vary the receive frequency in
increments smaller than 10 Hz. This is especially useful with
PSK31 and other narrow-band data modes. See page 99.
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