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SECTION 3
OPERATION
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3-1 General
2 .
3 .
4 .
5 .
This transceiver uses a PLL synthesizer controlled by
micro-computer .
The operating frequency can be
shifted in either 5 kHz or 10 kHz steps .
The transceiver covers a wide frequency range of
143 .900 to 147 .995 MHz (which includes some MARS
frequencies) .
Operating frequencies can be set by simply pressing the
keys on the keyboard . Frequencies can also be stored in
the (15) memory channels .
Transmitter precautions
(1)
The TR-7850 antenna impedance is 50 ohms. Be
sure to
connect an antenna of 50
ohms
impedance .
(2)
Check the transmit frequency before operating to
insure that you do not interfere with other
stations .
(3)
By pressing the microphone PTT switch, the
TR-7850 is set in transmit mode ; the ON AIR
indicator will
light and
the meter
indicates
transmit power. Hold the microphone about 5 cm
from your mouth and speak .
Micro-Computer Reset (At first power-up)
If, at initial TURN-ON, an erroneous or incorrect read-
out is displayed, reset the MICRO-COMPUTER .
This is not an equipment malfunction .
(1)
Disconnect the power plug from the DC power
terminal (21) and after about five seconds recon-
nect the power plug .
Turn on the power switch (1) .
(2)
BACK-UP BATTERIES INSTALLED
First remove
the
batteries, and reset the
MICRO-COMPUTER as previously described .
Reinstall the batteries .
3-2 Memory Input
The TR-7850 has two different memories ; normal memory
and split channel memory (including
priority
memory
channel) .
1 . Normal memory (CH 1-13)
Example : To store 146 .940 MHz (- 600 kHz shift) in
CH 5,
(1) Set the KEY/M .SEL switch to the KEY position
(2) Set the MEMORY channel selector (16) to the CH
5 position .
(3)
Enter the frequency.
a)
b)
c)
d)
Press the
Press the
Press the
Press the Oo
[DISPLAY]
Frequency before
input .
key (MHz digit) . . . . . . . . . . . . . b.
key (100 KHz digit) . . . . . . . S.9
key (10 kHz digit) . . . . . . . . . 6.9
Lf
key (1 kHz digit) . . . . . . . . . . . I59 14 0
(Simplex operation)
(4) Input the shift mode .
Press the = key (the indication changes from
to " -
, .)
.
(5) Store the frequency in the memory .
Press the
0
key .
A tone will sound, indicating data entry.
Change the channel and input other frequencies in
the same manner .
Notes : (MEMORY input)
a .
To input MHz digits, use the 3 through 8 keys.
b .
When the MHz digit is 3, use only the 9 key to the
input the 100 kHz digit.
c .
When a wrong frequency is input in error, press
the ©key to clear the frequency . The frequency
display will indicate the previous frequency before
the last input .
Reenter the correct frequency by
again pressing the keys, starting with the MHz
digit .
d .
When the 1 kHz digit keys (M-®) are pressed,
the frequency display indicates
U' .
When the
(CM-CM)
keys are pressed, the display indicates S
e .
Do not press any other key until the correct fre-
quency is input . The transceiver holds the previous
frequency until the new frequency is input .
Notes : (GENERAL)
1 q
If you wish to change the shift mode from simplex,
press the shift key for the desired offset .
2 .
For frequencies outside the 144 .00 - 174 .995
MHz amateur band, the transceiver operates in
simplex mode independent of the ~+ or F- -~ keys.
3 .
When the transmit frequency is offset (±600 kHz
and is outside the amateur band, the transceiver
will operate thusly :
Press the = key :
Shift mode is indicated .
Press the
key :
Indication
Frequency is out-of-band and is not
stored in memory .
(Tone does not sound .)
Transmit :
Mode changes to simplex, pressing
the PTT switch .
(Tone sounds at this time .)
Receive :
Remains in simplex mode at PTT
release .
The simplex frequency can now be
memorized .
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