Vertex Standard FT-1000MP - Manual (Page 59)

Page 57 O
PERATING
M
ANUAL
AM T
RANSMISSION
Transmitter setup for the AM mode is essentially
the same as for LSB or USB, except that you must
avoid overmodulating, and limit carrier power to 25
watts. This carrier level ensures that sufficient power
is available for the voice sideband envelopes.
r VOX can be used in the AM mode, but for now,
make sure the [VOX] switch is off, so as not to con-
fuse adjustments.
r With the AM mode selected, press the METER
[ALC/COMP] button to view the ALC range.
r Press the PTT switch, and rotate the RF PWR con-
trol for the desired power output (remember to limit
transmitter carrier power to 25 watts in the AM
mode).
r If you have already set the MIC control as described
for SSB transmission, there should be no need to
readjust it. If not, close the PTT switch, and adjust
this control just to the point where the ALC begins
to deflect slightly, and stays within the red ALC zone.
Don’t set it too far beyond this point, or your signal
will become distorted from over-modulation.
r The transmit monitor is very helpful in setting the
correct modulation level, and if you have head-
phones on, you should turn the monitor on now.
Note that the speech processor is disabled in the
AM mode. You can, however, activate the VOX, if de-
sired.
D
IGITAL
M
ODE
O
PERATION
Information regarding connection of your MARK-V
FT-1000MP Field to commonly-available digital-mode
modem devices is presented beginning on page 15.
Operating practices generally are governed by de-
tails provided in the operating manual for the TNC or
modem you are using. However, a few guidelines are
presented below, to help you get on the air quickly.
RTTY Operation
To operate, just press the RTTY mode button once
or twice to select the desired sideband for operation.
LSB is default, and is used by normal convention (USB
can be selected for MARS or other applications).
Should you need reverse tone polarity or non-standard
shift (other than 170 Hz), configure menu selection 6-1
and 6-2 as desired.
T
RANSMITTING
O
PERATION
Shift
170 Hz ø
425 Hz
850 Hz
RTTY T ONE /S HIFT I NFORMATION
Mark
2125 Hz
2125 Hz
2125 Hz
Space
2295 Hz
2550 Hz
2975 Hz
High Tone Pair ø
Mark
1275 Hz
1275 Hz
1275 Hz
Space
1445 Hz
1700 Hz
2125 Hz
Low Tone Pair
ø indicates default setting (used by normal convention)
For optimum signal-to-noise ratio, use the 250-Hz
or 500-Hz BANDWIDTH selection for 170-Hz shift, the
500-Hz selection for 425-Hz shift, or the 2.0-kHz se-
lection for 850-Hz shift. Remember that the Sub VFO
receiver bandwidth is only selectable between 6.0 kHz,
2.4 kHz and 500 Hz (optional YF-100 required) for
RTTY (and PKT).
Note that for AMTOR operation, you must have the
VOX button off, and may need to set the AGC control
to “FAST” or “OFF” (and reduce the setting of the RF
Gain control) for Mode A (ARQ).
300-Baud Packet
Construct a patch cable as required, and connect
your TNC to the rear-panel PACKET jack. Do not con-
nect the squelch line (pin 5) for 300-baud packet op-
eration.
Tuning is very critical for F1 packet: you should tune
the transmitter and receiver within 10 Hz of a signal to
minimize repeats. The MARK-V FT-1000MP
Field in-
cludes a few custom features to make packet opera-
tion more convenient.
Packet Tone Pair - This offsets the center of the IF
bandpass according to the packet tone pair you are
using. If set correctly, the receiver passband will re-
main centered on a properly-tuned packet station when
switching between wide and narrow IF filters, minimiz-