VX-7R O
PERATING
M
ANUAL
15
O
PERATION
S
ELECTING
THE
F
REQUENCY
B
AND
The
VX-7R
covers an incredibly wide
frequency range, over which a number
of different operating modes are used.
Therefore, the
VX-7R
’s frequency cov-
erage has been divided into different
operating bands, each of which has its
own pre-set channel steps and operat-
ing modes. You can change the chan-
nel steps and operating modes later, if
you like (see page 25).
BAND
BC Band
SW Band
FM BC Band
AIR Band
VHF-TV Band
Action Band 1
UHF TV Band
Action Band 2
50 MHz Ham Band
144 MHz Ham Band
222 MHz Ham Band
430 MHz Ham Band
“Main” Band
0.5-1.8 MHz
1.8-30 MHz
59-108 MHz
(88-108 MHz)
108-137 MHz
174-222 MHz
225-420 MHz
470-729 MHz
(470-800 MHz)
800-999 MHz
30-59 MHz
(30-88 MHz)
137-174 MHz
222-225 MHz
(—)
420-470 MHz
“Sub” Band
—
—
—
—
—
—
—
—
50-54 MHz
140-174 MHz
—
420-470 MHz
(
): EXP Version
To Change Operating Bands
1.
Press the
key repetitively. You will see the LCD indication move toward a higher
frequency band each time you press the
key..
2.
If you wish to move the operating band selection downward (toward
lower
frequen-
cies), press the
key first, then press the
key..
3.
The
VX-7R
uses a dual VFO system (described previously). To switch TX/RX opera-
tion from the “Main” VFO to the “Sub” VFO instantly, press the
key momentarily..
Pressing the
key will return the
VX-7R
to the “Main” VFO. The frequency band
bearing the “Large” characters is the band on which transmission is possible; the band
designated by “Small” characters may only be used for reception.
4.
Once you have selected the desired band, you may initiate manual tuning (or scanning)
per the discussions on the next page.
Dual Receive Notice
The
VX-7R
may receive very strong signals on the Image frequency, and/or the
receiver sensitivity may be somewhat reduced by the combination of the “Main”
and “Sub” band frequencies while Dual Receive operation is engaged.
If you experience interference that you suspect may be coming in via an “Image”
path, you may calculate the possible frequencies using the formulas below. This infor-
mation may be used in the design of effective countermeasures such as traps, etc.
¦
3.579545 MHz x
n
¦
11.7 MHz x
n
(
n
is an integer: 1, 2, 3, …)
¦
“Main” band freq. = (“Sub” band freq. ± 46.35 MHz) x
n
¦
“Sub” band freq. = (“Main” band freq. ± 47.25 MHz) x
n
(@ “Main band = NFM)
¦
“Sub” band freq. = (“Main” band freq. ± 45.8 MHz) x
n
(@ “Main band = WFM)
