Meterring; Narrow If Filters; Dealing With Interference - Yaesu FT-847 Operating Manual

M
ETERING
The FT-847 includes dual meter functions, useful in
many operating situations.
N -S M
ON ATELLITE ODE
On receive, the Meter dis-
plays incoming signal
strength ("S" Meter). Ad-
ditionally, in the FM
mode, the lower scale of the Meter is a Discriminator
Center meter.
On transmit, the Meter
indicates Power Output
("PO") in Watts. How-
ever, via Menu #24, trans-
mit metering may be
changed to indicate ALC
voltage (internal ALC
plus any external ALC
from a linear amplifier). See page 86.
S M
ATELLITE ODE
The Satellite mode utilizes simultaneous transmission
and reception. Accordingly, simultaneous T
metering functions are provided.
The S-Meter provides
signal strength monitor-
ing on the downlink sig-
nal from the satellite. On
transmit, the default meter function is PO; however,
Menu #34 may be used to select ALC metering in-
stead. Menu #34 also provides the option to disable
transmitter monitoring, and select Discriminator Cen-
ter metering (FM mode) in addition to the S-Meter
function. See page 88.
FT-847 O
PERATING
R
ECEIVER
and R
X X
M
ANUAL
OPERATION
F
EATURES

Dealing with Interference

The FT-847 includes a wealth of features designed to
facilitate single-signal reception during conditions of
heavy interference. These features are described be-
low.
N IF F
ARROW ILTERS
If you have installed the optional YF-115C 500
Hz CW filter, pressing the [NAR] key while in
the CW mode will place this filter in line, lead-
ing to a dramatic reduction in adjacent-fre-
quency interference, as well as greater sensi-
tivity to weak signals (due to the reduced bandwidth).
In the AM mode, pressing the [NAR] key causes the
bandwidth to be narrowed to 2.4 kHz (the same band-
width as used on SSB). Although the fidelity will not
be particularly good, this bandwidth may enable you
to copy weak AM stations under very difficult,
crowded conditions. Rotating the DSP LOW CUT con-
trol slightly clockwise (see next page) will reduce the
bass response, which may make the incoming signal
sound more pleasant.
In the FM mode, the "Narrow" selection reduces the
receiver bandwidth and the transmitter deviation, so
as to comply with international regulations governing
FM operation below 30 MHz. The "Narrow" mode
may, however, be utilized in the VHF/UHF bands in
areas of extreme channel congestion.
( CW/AM/FM M
ODES
)
39