Tips For Am Broadcast Reception; Tips For Fm Communications - Yaesu FT-767GX Operating Manual

4.15 for AM Broadcast
Tips
The FT-767CX is ideal
broadcasL reception - especially if you have
an antenna tuned for the shortwave broadcast
bands. Tune to the desired band and set up
the receiver s e n s i t i v i t y
§ 4 . 1 3 . 1 and § 4 . 1 3.2.
and key in a frequency that is an even m u l ­
5
tiple o f kHz. Since nearly all shortwave
broadcasting signals are spaced ln
nels, press O LOCK and MIC U/0, and use the
PROCRAM or microphone OOWN UP keys for tunlng
5
in kHz steps (we suggest you leave these set
as the programmed steps for A M and SSB).
Very strong signals will provide best fidelity
when the NAR switch is off,
nals you can reduce
which causes the SSB filter to
Unfortunately, t h i s
quite a bit, aad may
music, or long periods of listening.
rapid fading occurs, you should move
selection to medium.
occur during the fades
fading.
Both of these problems can be solved by using
an SSB mode for AM reception (this is called
ECSS, Exhaulted Carrier Single Sideband mode).
ere y select the sideband
M l
provides the best reception.
the added benefit of allowing you to suppress
interference that might be caused by an adja­
cent statlon, by selecting the sideband on the
opposite side of the carrier.
this reature co be useful,
be tuned exactly to the carrler frequency of
the signal (or it will sound awful):
where the kHz programmed tuning steps on SSB
5
modes are useful. Once you have keyed in a
frequency with
5.00
the up/down keys wi
11
carrier channels when
Note: When the FT-767CX is first turned
on about 15 to
30 minutes m a y
for the o s c i l l a t o r s
receiver is s�able enough for comfortable
ECSS reception after it has warmed up.
Reception
for serious shortwave
as described
Then select slow ACC,
5
kHz chan­
but for weak sig­
noise by turning i t on,
be
used for AM.
also reduces f i d e l i t y
be uncomfonable for
Also,
the ACC
Even so, distortion may
due to selective
or
(LSB USB) that
This mode has
However, for
the receiver must
this
as the last two digits,
keep you tuned to the
you change stations.
be r eq uir
e d
to s t a b i l i z e . The
During or ECSS reception, use the SHIFT and
AM
TONE contrais to tailor the audio of a broad­
cast as you desire.
close together you will hear a heterodyne o f
theír carriers.
m o v e t h e undesired carrier i f i t
i n 2.5
(under kHz), or the SHIFT control (in ECSS
mode) if i t is farther away (higher pitch).
4. 1 6 for FM
Tips
FM operation with the FT-767CX uses
deviation, which mode is used on the upper end
of the IOm amateur band, and on VHF and UHF.
conven tion,
By
steps, whích sbould be set up for selection by
the PROCRAM and microphone up/down keys
( § 4.8). Press the MIC U/0 switch, and set the
SQL control so that the noise is just silenced
on a clear channel.
i f
When fine tuning the receiver in
nel steps, press the O I S C button at the top
leh corner. This causes the
cate discriminator
signal is tuned in correctly (or when no sig­
nal is present at all),
the center of its range.
flects to either side
being received
tum
the DISC
strength after a signal
For working through
standard repeater shifts for each band i n the
offset memories
favorite repeater
memories for scanning, and use the TRACK func­
is
tion when tuning
Use the YM-48A OTMF' microphone to generate
DTMF' tones for autopatching.
switch while entering digits on
keypad.
See § <:. 7. 4 and § 4. 1
sq lc operacion.
e
u h
- 32 -
l f two AM stations are
NOTCH filter
Use the
is
Communications
each band has certain chanael
between chan­
·
meter to indi­
center tuning:
the meter deflects to
l f the meter de­
of center, a signal
off-center. You can always
off to
switch check
is 'centered'.
repeaters, store
( § 4. 1 1 . 1 ) . Store
output frequencies
repeater sub-bands.
Close the PTT
the microphone
2
for tone burst and tone
to re­
close
kHz
± 5
when a
is
signal
the
your
in the