Instruction manual
74 October 1997
Y FT 920 HF T i
–10 –8 –6 –4 –2 0 2 4 6 8 10
–80
–70
–60
–50
–40
–30
–20
–10
0
Frequency Offset (kHz)
Reference Level: 0 dB PEP
Y FT 920 HF T i
–10 –8 –6 –4 –2 0 2 4 6 8 10
–80
–70
–60
–50
–40
–30
–20
–10
0
Frequency Offset (kHz)
Reference Level: 0 dB PEP
Figure 1—Worst-case spectral display of the FT-920 transmitter
during two-tone intermodulation distortion (IMD) testing on HF. The
worst-case third-order product is approximately 25 dB below PEP
output, and the worst-case fifth-order product is approximately
31 dB down. The transceiver was being operated at 100 W output at
24.950 MHz.
Figure 2—Spectral display of the FT-920 transmitter during two-tone
intermodulation distortion (IMD) testing on 6 meters. Third-order
product is approximately 27 dB below PEP output, and fifth-order
product is approximately 33 dB down. The transceiver was being
operated at 100 W output at 50.2 MHz.
Figure 3—CW keying waveform for the FT-920
showing the first two dits in full-break-in (QSK)
mode. The equivalent keying speed is 60 WPM.
The upper trace is the actual key closure; the
lower trace is the RF envelope. Horizontal
divisions are 10 ms. The transceiver was being
operated at 100 W output at 14.2 MHz. Note
that both dits are somewhat shortened. This
does not occur in semi-break-in (VOX) mode.
Y FT 920 HF T i
2 4 6 8 10 12 14 16 18 20 22
–140
–130
–120
–110
–100
–90
–80
–70
–60
Frequency Sweep: 2 to 22 kHz from Carrier
Reference Level: - 60 dBc/Hz
Vertical Scale: dBc/Hz
Y FT 920 HF T i
2 4 6 8 10 12 14 16 18 20 22
–140
–130
–120
–110
–100
–90
–80
–70
–60
Frequency Sweep: 2 to 22 kHz from Carrier
Reference Level: - 60 dBc/Hz
Vertical Scale: dBc/Hz
Figure 4—Worst-case tested spectral display of the FT-920
transmitter output during composite-noise testing on HF. Power
output is 100 W at 3.5 MHz. The carrier, off the left edge of the
plot, is not shown. This plot shows composite transmitted noise
2 to 22 kHz from the carrier.
Figure 5—Spectral display of the FT-920 transmitter output
during composite-noise testing on 6 meters. Power output is 100
W at 50.2 MHz. The carrier, off the left edge of the plot, is not
shown. This plot shows composite transmitted noise 2 to
22 kHz from the carrier.
through 15 meters. The other is a lower-
noise, dual-gate MOSFET which defaults for
use on 12 through 6 meters. (You can select
which preamp you want via the menu sys-
tem.) An
ATT
enuator has 6, 12 or 18 dB steps,
a big improvement on the 20-dB fixed at-
tenuators of the past. The
AGC
switch is also
a step switch, and successive pushes go
through fast, slow, and off.
One nice touch a lot of operators will
appreciate is the front-panel
ANTENNA
switch to switch between two antennas. An-
tenna selection stays in the radio’s band
memory, too. For example, connect antenna
A for 20 meters and antenna B for 6 meters.
As you switch back and forth between the
two bands, the antennas change automati-
cally. Even better: a separate
RX
(receive)
antenna switch lets you choose a separate
receive antenna (or, alternatively, a VHF or
UHF transverter, receiving converter or other
accessory) via a rear-panel phono jack. This
separate receive antenna function is espe-
cially well-executed. A menu option lets you
choose to protect the transceiver’s front end
against pickup of stray RF from the transmit-
ter by switching the receiving antenna out of
the line during transmit.
The radio has separate switches for each
mode:
SSB
,
CW
,
AM
(optional board required
for transmit),
FM
(available with the optional
FM-1 board), and
DATA
(FSK or AFSK). The
SSB
and
CW
buttons also let you toggle be-
tween the desired sideband for those modes.
The
LOCK
switch to the right of the VFO
knob allows locking the VFO A frequency—
a handy feature when youngsters walk into
the shack (there’s another
LOCK
button for
the
VFO B
knob).
The
A—>B
button moves the frequency of
VFO A to VFO B. The
A<—>B
knob swaps
the contents of the two VFOs. The
RPT
but-
ton allows the operator to set a repeater off-
set (by menu) for 29 or 52 MHz FM opera-
tion. If you need a CTCSS tone, you set this