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Dealing with Interference
Operation
Displaying the 10's-of-Hz Digit
The FT-890 defaults to display frequency only
to 100-Hz resolution, so the actual 10-Hz tun-
ing resolution is not visible. This means that
when tuning with the microphone
UP
and
DWN
buttons in CW and SSB modes, the dis-
played frequency changes only once every 10
button presses. You can change the display to
show the 10-Hz digit at the right (in place of
the memory number), by holding the
BANDIMEM UP
button while switching the set
on. Tuning steps are not affected.
microphone has
UP
and
DWN
buttons, you can
use them to tune in 10- or 100-Hz steps. Also, the
FAST
button on the microphone duplicates the
FAST
button on the front panel.
General Coverage Reception
You may have already noticed that you can
tune outside one of the amateur bands (actually,
outside the 500-kHz segment that includes each
ham band) regardless of whether GEN or ham-
stepping is selected for the
BANDIMEM DOWN
and
LIP
buttons. However, the transmitter (and
antenna tuner) are disabled on such frequencies.
If you try to transmit, the
TX
LED still lights, but
there is no RF power output.
Also, the ham band recall system ignores such
frequencies. If you select a ham band and then
tune outside the band, the non-ham frequency
will be lost when you change bands. When you
return to the original band you will find that it
has reverted to the (ham-band) frequency it was
on when that band was previously selected.
Don't let this worry you: any displayed fre-
quency can always be stored in a memory (as
described on page 23) so you can recall it quickly
later. Once you become familiar with the memo-
ries, you will find this convenient: each memory
can be tuned just like a pair of VFOs, and stored
again without having to go through the VFOs.
Besides the above, general coverage reception
provides all the features available on ham fre-
quencies.
Dealing with Interference
The FT-890 includes special features to sup-
press the many types of interference that may be
encountered on the HF bands. Still, real world
conditions are constantly changing, so optimum
setting of the controls is somewhat of an art,
requiring familiarity with the types of interfer-
ence and the subtle effects of some controls.
Therefore the following information should be
considered only as general guidelines for typical
situations, and a starting point for your own
experimentation.
The controls are described in the order that
you would usually make them after changing
bands. An exception to this is if strong pulse
noise is present, such as from the lWoodpecker",
in which case you may need to activate the noise
blanker (described on the next page) before mak-
ing other adjustments.
Front End Selections:
RF Amp @PO)
&
Attenuation
A constant-gain, dual parallel FET RF ampli-
fier in the FT-890 receiver front end provides
high sensitivity to weak signals. This amplifier is
active whenever the
IPO
button is OFF, and by-
passed when it is on. Additionally, a 12-dB at-
tenuator in front of the RF amplifier can be
activated by the
A n
button.
Button Beeper Settings
As shipped from the factory, pressing a but-
ton on the front panel causes a beep to sound.
The volume of the beep is independent of the
receiver volume, and can be set by a trimpot
accessible through a hole in the left side of the
transceiver as described on page 20.
You can also toggle the beeper (to be enabled
or disabled) by holding the
NOTCH
button
near the lower left corner of the front panel
while switching the transceiver on.
If you wish to change the pitch of the beeper,
hold the
FAST
button (below left of the tuning
knob) while pressing the
NOTCH
button. This
causes the display to show the beeper fre-
quency in Hz, while double beeps sound.
Turning the
CLAR
knob adjusts the beep
pitch. When done, press the
NOTCH
button
again to return to normal operation.
page
14
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